feat: add inital in memory dispatcher

Add a simple in memory dispatcher for scalar requests and stream request.

.editorconfig

@@ -0,0 +1,409 @@
+root = true
+
+[*]
+indent_style = tab
+indent_size = 4
+tab_width = 4
+end_of_line = lf
+insert_final_newline = false
+trim_trailing_whitespace = true
+max_line_length = 120
+
+[*.{md,json,yaml,yml}]
+indent_size = 2
+indent_style = space
+trim_trailing_whitespace = false
+
+[*.{csproj,props,targets,slnx,config}]
+indent_size = 2
+indent_style = space
+
+[*.{cs,vb}]
+#### code quality rule overrides ####
+
+#> Identifiers should not match keywords
+dotnet_diagnostic.CA1716.severity = suggestion
+
+#### code style rule default severity ####
+dotnet_analyzer_diagnostic.category-style.severity = warning
+
+#> Use top-level statements
+dotnet_diagnostic.IDE0210.severity = none
+
+#### .NET Coding Conventions ####
+[*.{cs,vb}]
+# Organize usings
+file_header_template = Copyright (c) The Geekeey Authors\nSPDX-License-Identifier: EUPL-1.2
+dotnet_separate_import_directive_groups = true
+dotnet_sort_system_directives_first = true
+
+# this. and Me. preferences
+dotnet_style_qualification_for_event = false
+dotnet_style_qualification_for_field = false
+dotnet_style_qualification_for_method = false
+dotnet_style_qualification_for_property = false
+
+# Language keywords vs BCL types preferences
+dotnet_style_predefined_type_for_locals_parameters_members = true
+dotnet_style_predefined_type_for_member_access = true
+
+# Parentheses preferences
+dotnet_style_parentheses_in_arithmetic_binary_operators = always_for_clarity
+dotnet_style_parentheses_in_other_binary_operators = always_for_clarity
+dotnet_style_parentheses_in_other_operators = never_if_unnecessary
+dotnet_style_parentheses_in_relational_binary_operators = always_for_clarity
+
+# Modifier preferences
+dotnet_style_require_accessibility_modifiers = for_non_interface_members
+
+# Expression-level preferences
+dotnet_diagnostic.IDE0270.severity = none
+dotnet_style_coalesce_expression = true
+
+dotnet_style_collection_initializer = true
+dotnet_style_explicit_tuple_names = true
+dotnet_style_null_propagation = true
+dotnet_style_object_initializer = true
+dotnet_style_operator_placement_when_wrapping = beginning_of_line
+dotnet_style_prefer_auto_properties = true
+dotnet_style_prefer_compound_assignment = true
+
+dotnet_diagnostic.IDE0045.severity = suggestion
+dotnet_style_prefer_conditional_expression_over_assignment = true
+
+dotnet_diagnostic.IDE0046.severity = suggestion
+dotnet_style_prefer_conditional_expression_over_return = true
+
+dotnet_style_prefer_inferred_anonymous_type_member_names = true
+dotnet_style_prefer_inferred_tuple_names = true
+dotnet_style_prefer_is_null_check_over_reference_equality_method = true
+dotnet_style_prefer_simplified_boolean_expressions = true
+dotnet_style_prefer_simplified_interpolation = true
+dotnet_style_namespace_match_folder = false
+
+# Field preferences
+dotnet_style_readonly_field = true
+
+# Suppression preferences
+dotnet_remove_unnecessary_suppression_exclusions = none
+
+# ReSharper preferences
+resharper_wrap_object_and_collection_initializer_style = chop_always
+resharper_check_namespace_highlighting = none
+resharper_csharp_wrap_lines = false
+
+#### C# Coding Conventions ####
+[*.cs]
+
+# var preferences
+csharp_style_var_for_built_in_types = true
+csharp_style_var_when_type_is_apparent = true
+csharp_style_var_elsewhere = true
+
+# Expression-bodied members
+csharp_style_expression_bodied_accessors = true
+csharp_style_expression_bodied_constructors = false
+csharp_style_expression_bodied_indexers = true
+csharp_style_expression_bodied_lambdas = true
+csharp_style_expression_bodied_local_functions = false
+csharp_style_expression_bodied_methods = false
+csharp_style_expression_bodied_operators = false
+csharp_style_expression_bodied_properties = true
+
+# Pattern matching preferences
+csharp_style_pattern_matching_over_as_with_null_check = true
+csharp_style_pattern_matching_over_is_with_cast_check = true
+csharp_style_prefer_not_pattern = true
+csharp_style_prefer_pattern_matching = true
+csharp_style_prefer_switch_expression = true
+
+# Null-checking preferences
+csharp_style_conditional_delegate_call = true
+
+# Modifier preferences
+csharp_prefer_static_local_function = true
+csharp_preferred_modifier_order = public, private, protected, internal, static, extern, new, virtual, abstract, sealed, override, readonly, unsafe, volatile, async
+
+# Code-block preferences
+csharp_prefer_braces = true
+csharp_prefer_simple_using_statement = true
+
+# Expression-level preferences
+csharp_prefer_simple_default_expression = true
+csharp_style_deconstructed_variable_declaration = true
+csharp_style_inlined_variable_declaration = true
+csharp_style_pattern_local_over_anonymous_function = true
+csharp_style_prefer_index_operator = true
+csharp_style_prefer_range_operator = true
+csharp_style_throw_expression = true
+
+dotnet_diagnostic.IDE0058.severity = suggestion
+csharp_style_unused_value_assignment_preference = discard_variable
+csharp_style_unused_value_expression_statement_preference = discard_variable
+
+# 'using' directive preferences
+csharp_using_directive_placement = outside_namespace
+
+# 'namespace' preferences
+csharp_style_namespace_declarations = file_scoped
+
+# 'constructor' preferences
+csharp_style_prefer_primary_constructors = false
+
+#### C# Formatting Rules ####
+[*.cs]
+
+# New line preferences
+csharp_new_line_before_catch = true
+csharp_new_line_before_else = true
+csharp_new_line_before_finally = true
+csharp_new_line_before_members_in_anonymous_types = true
+csharp_new_line_before_members_in_object_initializers = true
+csharp_new_line_before_open_brace = all
+csharp_new_line_between_query_expression_clauses = true
+
+# Indentation preferences
+csharp_indent_block_contents = true
+csharp_indent_braces = false
+csharp_indent_case_contents = true
+csharp_indent_case_contents_when_block = true
+csharp_indent_labels = one_less_than_current
+csharp_indent_switch_labels = true
+
+# Space preferences
+csharp_space_after_cast = false
+csharp_space_after_colon_in_inheritance_clause = true
+csharp_space_after_comma = true
+csharp_space_after_dot = false
+csharp_space_after_keywords_in_control_flow_statements = true
+csharp_space_after_semicolon_in_for_statement = true
+csharp_space_around_binary_operators = before_and_after
+csharp_space_around_declaration_statements = false
+csharp_space_before_colon_in_inheritance_clause = true
+csharp_space_before_comma = false
+csharp_space_before_dot = false
+csharp_space_before_open_square_brackets = false
+csharp_space_before_semicolon_in_for_statement = false
+csharp_space_between_empty_square_brackets = false
+csharp_space_between_method_call_empty_parameter_list_parentheses = false
+csharp_space_between_method_call_name_and_opening_parenthesis = false
+csharp_space_between_method_call_parameter_list_parentheses = false
+csharp_space_between_method_declaration_empty_parameter_list_parentheses = false
+csharp_space_between_method_declaration_name_and_open_parenthesis = false
+csharp_space_between_method_declaration_parameter_list_parentheses = false
+csharp_space_between_parentheses = false
+csharp_space_between_square_brackets = false
+
+# Wrapping preferences
+csharp_preserve_single_line_blocks = true
+csharp_preserve_single_line_statements = true
+
+#### .NET Naming styles ####
+[*.{cs,vb}]
+
+dotnet_naming_rule.types_and_namespaces_should_be_pascalcase.severity = suggestion
+dotnet_naming_rule.types_and_namespaces_should_be_pascalcase.symbols = types_and_namespaces
+dotnet_naming_rule.types_and_namespaces_should_be_pascalcase.style = pascalcase
+
+dotnet_naming_symbols.types_and_namespaces.applicable_kinds = namespace, class, struct, interface, enum
+dotnet_naming_symbols.types_and_namespaces.applicable_accessibilities = public, internal, private, protected, protected_internal, private_protected
+dotnet_naming_symbols.types_and_namespaces.required_modifiers =
+
+
+dotnet_naming_rule.interfaces_should_be_ipascalcase.severity = suggestion
+dotnet_naming_rule.interfaces_should_be_ipascalcase.symbols = interfaces
+dotnet_naming_rule.interfaces_should_be_ipascalcase.style = ipascalcase
+
+dotnet_naming_symbols.interfaces.applicable_kinds = interface
+dotnet_naming_symbols.interfaces.applicable_accessibilities = public, internal, private, protected, protected_internal, private_protected
+dotnet_naming_symbols.interfaces.required_modifiers =
+
+
+dotnet_naming_rule.enums_should_be_pascalcase.severity = suggestion
+dotnet_naming_rule.enums_should_be_pascalcase.symbols = enums
+dotnet_naming_rule.enums_should_be_pascalcase.style = pascalcase
+
+dotnet_naming_symbols.enums.applicable_kinds = enum
+dotnet_naming_symbols.enums.applicable_accessibilities = public, internal, private, protected, protected_internal, private_protected
+dotnet_naming_symbols.enums.required_modifiers =
+
+
+dotnet_naming_rule.type_parameters_should_be_tpascalcase.severity = suggestion
+dotnet_naming_rule.type_parameters_should_be_tpascalcase.symbols = type_parameters
+dotnet_naming_rule.type_parameters_should_be_tpascalcase.style = tpascalcase
+
+dotnet_naming_symbols.type_parameters.applicable_kinds = namespace
+dotnet_naming_symbols.type_parameters.applicable_accessibilities = *
+dotnet_naming_symbols.type_parameters.required_modifiers =
+
+
+dotnet_naming_rule.methods_should_be_pascalcase.severity = suggestion
+dotnet_naming_rule.methods_should_be_pascalcase.symbols = methods
+dotnet_naming_rule.methods_should_be_pascalcase.style = pascalcase
+
+dotnet_naming_symbols.methods.applicable_kinds = method
+dotnet_naming_symbols.methods.applicable_accessibilities = public, internal, private, protected, protected_internal, private_protected
+dotnet_naming_symbols.methods.required_modifiers =
+
+
+dotnet_naming_rule.parameters_should_be_camelcase.severity = suggestion
+dotnet_naming_rule.parameters_should_be_camelcase.symbols = parameters
+dotnet_naming_rule.parameters_should_be_camelcase.style = camelcase
+
+dotnet_naming_symbols.parameters.applicable_kinds = parameter
+dotnet_naming_symbols.parameters.applicable_accessibilities = *
+dotnet_naming_symbols.parameters.required_modifiers =
+
+
+dotnet_naming_rule.properties_should_be_pascalcase.severity = suggestion
+dotnet_naming_rule.properties_should_be_pascalcase.symbols = properties
+dotnet_naming_rule.properties_should_be_pascalcase.style = pascalcase
+
+dotnet_naming_symbols.properties.applicable_kinds = property
+dotnet_naming_symbols.properties.applicable_accessibilities = public, internal, private, protected, protected_internal, private_protected
+dotnet_naming_symbols.properties.required_modifiers =
+
+
+dotnet_naming_rule.events_should_be_pascalcase.severity = suggestion
+dotnet_naming_rule.events_should_be_pascalcase.symbols = events
+dotnet_naming_rule.events_should_be_pascalcase.style = pascalcase
+
+dotnet_naming_symbols.events.applicable_kinds = event
+dotnet_naming_symbols.events.applicable_accessibilities = public, internal, private, protected, protected_internal, private_protected
+dotnet_naming_symbols.events.required_modifiers =
+
+# local
+
+dotnet_naming_rule.local_variables_should_be_camelcase.severity = suggestion
+dotnet_naming_rule.local_variables_should_be_camelcase.symbols = local_variables
+dotnet_naming_rule.local_variables_should_be_camelcase.style = camelcase
+
+dotnet_naming_symbols.local_variables.applicable_kinds = local
+dotnet_naming_symbols.local_variables.applicable_accessibilities = local
+dotnet_naming_symbols.local_variables.required_modifiers =
+
+
+dotnet_naming_rule.local_functions_should_be_pascalcase.severity = suggestion
+dotnet_naming_rule.local_functions_should_be_pascalcase.symbols = local_functions
+dotnet_naming_rule.local_functions_should_be_pascalcase.style = pascalcase
+
+dotnet_naming_symbols.local_functions.applicable_kinds = local_function
+dotnet_naming_symbols.local_functions.applicable_accessibilities = *
+dotnet_naming_symbols.local_functions.required_modifiers =
+
+
+dotnet_naming_rule.local_constants_should_be_camelcase.severity = suggestion
+dotnet_naming_rule.local_constants_should_be_camelcase.symbols = local_constants
+dotnet_naming_rule.local_constants_should_be_camelcase.style = camelcase
+
+dotnet_naming_symbols.local_constants.applicable_kinds = local
+dotnet_naming_symbols.local_constants.applicable_accessibilities = local
+dotnet_naming_symbols.local_constants.required_modifiers = const
+
+# private
+
+dotnet_naming_rule.private_fields_should_be__camelcase.severity = suggestion
+dotnet_naming_rule.private_fields_should_be__camelcase.symbols = private_fields
+dotnet_naming_rule.private_fields_should_be__camelcase.style = _camelcase
+
+dotnet_naming_symbols.private_fields.applicable_kinds = field
+dotnet_naming_symbols.private_fields.applicable_accessibilities = private, protected, protected_internal, private_protected
+dotnet_naming_symbols.private_fields.required_modifiers =
+
+
+dotnet_naming_rule.private_static_fields_should_be_s_camelcase.severity = suggestion
+dotnet_naming_rule.private_static_fields_should_be_s_camelcase.symbols = private_static_fields
+dotnet_naming_rule.private_static_fields_should_be_s_camelcase.style = s_camelcase
+
+dotnet_naming_symbols.private_static_fields.applicable_kinds = field
+dotnet_naming_symbols.private_static_fields.applicable_accessibilities = private, protected, protected_internal, private_protected
+dotnet_naming_symbols.private_static_fields.required_modifiers = static
+
+
+dotnet_naming_rule.private_static_readonly_fields_should_be_pascalcase.severity = suggestion
+dotnet_naming_rule.private_static_readonly_fields_should_be_pascalcase.symbols = private_static_readonly_fields
+dotnet_naming_rule.private_static_readonly_fields_should_be_pascalcase.style = pascalcase
+
+dotnet_naming_symbols.private_static_readonly_fields.applicable_kinds = field
+dotnet_naming_symbols.private_static_readonly_fields.applicable_accessibilities = private, protected, protected_internal, private_protected
+dotnet_naming_symbols.private_static_readonly_fields.required_modifiers = readonly, static
+
+
+dotnet_naming_rule.private_constant_fields_should_be_pascalcase.severity = suggestion
+dotnet_naming_rule.private_constant_fields_should_be_pascalcase.symbols = private_constant_fields
+dotnet_naming_rule.private_constant_fields_should_be_pascalcase.style = pascalcase
+
+dotnet_naming_symbols.private_constant_fields.applicable_kinds = field
+dotnet_naming_symbols.private_constant_fields.applicable_accessibilities = private, protected, protected_internal, private_protected
+dotnet_naming_symbols.private_constant_fields.required_modifiers = const
+
+# public
+
+dotnet_naming_rule.public_fields_should_be_pascalcase.severity = suggestion
+dotnet_naming_rule.public_fields_should_be_pascalcase.symbols = public_fields
+dotnet_naming_rule.public_fields_should_be_pascalcase.style = pascalcase
+
+dotnet_naming_symbols.public_fields.applicable_kinds = field
+dotnet_naming_symbols.public_fields.applicable_accessibilities = public, internal
+dotnet_naming_symbols.public_fields.required_modifiers =
+
+
+dotnet_naming_rule.public_static_readonly_fields_should_be_pascalcase.severity = suggestion
+dotnet_naming_rule.public_static_readonly_fields_should_be_pascalcase.symbols = public_static_readonly_fields
+dotnet_naming_rule.public_static_readonly_fields_should_be_pascalcase.style = pascalcase
+
+dotnet_naming_symbols.public_static_readonly_fields.applicable_kinds = field
+dotnet_naming_symbols.public_static_readonly_fields.applicable_accessibilities = public, internal
+dotnet_naming_symbols.public_static_readonly_fields.required_modifiers = readonly, static
+
+
+dotnet_naming_rule.public_constant_fields_should_be_pascalcase.severity = suggestion
+dotnet_naming_rule.public_constant_fields_should_be_pascalcase.symbols = public_constant_fields
+dotnet_naming_rule.public_constant_fields_should_be_pascalcase.style = pascalcase
+
+dotnet_naming_symbols.public_constant_fields.applicable_kinds = field
+dotnet_naming_symbols.public_constant_fields.applicable_accessibilities = public, internal
+dotnet_naming_symbols.public_constant_fields.required_modifiers = const
+
+# others
+
+dotnet_naming_rule.non_field_members_should_be_pascalcase.severity = suggestion
+dotnet_naming_rule.non_field_members_should_be_pascalcase.symbols = non_field_members
+dotnet_naming_rule.non_field_members_should_be_pascalcase.style = pascalcase
+
+dotnet_naming_symbols.non_field_members.applicable_kinds = property, event, method
+dotnet_naming_symbols.non_field_members.applicable_accessibilities = public, internal, private, protected, protected_internal, private_protected
+dotnet_naming_symbols.non_field_members.required_modifiers =
+
+
+# Naming styles
+
+dotnet_naming_style.pascalcase.required_prefix =
+dotnet_naming_style.pascalcase.required_suffix =
+dotnet_naming_style.pascalcase.word_separator =
+dotnet_naming_style.pascalcase.capitalization = pascal_case
+
+dotnet_naming_style.ipascalcase.required_prefix = I
+dotnet_naming_style.ipascalcase.required_suffix =
+dotnet_naming_style.ipascalcase.word_separator =
+dotnet_naming_style.ipascalcase.capitalization = pascal_case
+
+dotnet_naming_style.tpascalcase.required_prefix = T
+dotnet_naming_style.tpascalcase.required_suffix =
+dotnet_naming_style.tpascalcase.word_separator =
+dotnet_naming_style.tpascalcase.capitalization = pascal_case
+
+dotnet_naming_style._camelcase.required_prefix = _
+dotnet_naming_style._camelcase.required_suffix =
+dotnet_naming_style._camelcase.word_separator =
+dotnet_naming_style._camelcase.capitalization = camel_case
+
+dotnet_naming_style.camelcase.required_prefix =
+dotnet_naming_style.camelcase.required_suffix =
+dotnet_naming_style.camelcase.word_separator =
+dotnet_naming_style.camelcase.capitalization = camel_case
+
+dotnet_naming_style.s_camelcase.required_prefix = s_
+dotnet_naming_style.s_camelcase.required_suffix =
+dotnet_naming_style.s_camelcase.word_separator =
+dotnet_naming_style.s_camelcase.capitalization = camel_case

.forgejo/workflows/default.yml

@@ -0,0 +1,43 @@
+name: default
+
+on:
+  push:
+    branches: [ "main", "develop" ]
+    paths-ignore:
+      - "doc/**"
+      - "*.md"
+  pull_request:
+    branches: [ "main", "develop" ]
+    paths-ignore:
+      - "doc/**"
+      - "*.md"
+
+jobs:
+  default:
+    name: dotnet-default-workflow
+    runs-on: debian-latest
+    strategy:
+      matrix:
+        dotnet-version: [ "10.0" ]
+    container: mcr.microsoft.com/dotnet/sdk:${{ matrix.dotnet-version }}
+    steps:
+      - name: checkout
+        uses: https://code.geekeey.de/actions/checkout@1
+
+      - name: nuget login
+        run: |
+          # This token is readonly and can only be used for restore
+          dotnet nuget update source geekeey --store-password-in-clear-text \
+            --username "${{ github.actor }}" --password "${{ github.token }}"
+
+      - name: dotnet pack
+        run: |
+          dotnet pack -p:ContinuousIntegrationBuild=true
+
+      - name: dotnet format --verify-no-changes
+        run: |
+          dotnet format --no-restore --verify-no-changes --verbosity normal
+
+      - name: dotnet test
+        run: |
+          dotnet test -p:ContinuousIntegrationBuild=true

.forgejo/workflows/release.yml

@@ -0,0 +1,40 @@
+name: release
+
+on:
+  push:
+    tags: [ "[0-9]+.[0-9]+.[0-9]+" ]
+
+jobs:
+  release:
+    name: dotnet-release-workflow
+    runs-on: debian-latest
+    strategy:
+      matrix:
+        dotnet-version: [ "10.0" ]
+    container: mcr.microsoft.com/dotnet/sdk:${{ matrix.dotnet-version }}
+    steps:
+      - uses: https://code.geekeey.de/actions/checkout@1
+
+      - name: nuget login
+        run: |
+          # This token is readonly and can only be used for restore
+          dotnet nuget update source geekeey --store-password-in-clear-text \
+            --username "${{ github.actor }}" --password "${{ github.token }}"
+
+      - name: dotnet pack
+        run: |
+          dotnet pack -p:ContinuousIntegrationBuild=true
+
+      - name: dotnet format --verify-no-changes
+        run: |
+          dotnet format --no-restore --verify-no-changes --verbosity normal
+
+      - name: dotnet test
+        run: |
+          dotnet test -p:ContinuousIntegrationBuild=true
+
+      - name: dotnet nuget push
+        run: |
+          # The token used here is only intended to publish packages
+          dotnet nuget push -k "${{ secrets.geekeey_package_registry }}" \
+            artifacts/package/release/Geekeey.*.nupkg

.gitignore

@@ -0,0 +1,2 @@
+artifacts/
+*.DotSettings.user

CHANGELOG.md

@@ -0,0 +1,18 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+
+- This is the initial release of the library.
+
+### Changed
+
+### Removed
+
+[1.0.0]: https://code.geekeey.de/geekeey/request/releases/tag/1.0.0
+[Unreleased]: https://code.geekeey.de/geekeey/request/compare/1.0.0...HEAD

Directory.Build.props

@@ -0,0 +1,38 @@
+<Project>
+  <PropertyGroup Condition="'$(ArtifactsPath)' == ''">
+    <ArtifactsPath>$(MSBuildThisFileDirectory)artifacts</ArtifactsPath>
+  </PropertyGroup>
+
+  <PropertyGroup>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <PropertyGroup>
+    <VersionPrefix>1.0.0</VersionPrefix>
+  </PropertyGroup>
+
+  <PropertyGroup>
+    <AnalysisMode>Recommended</AnalysisMode>
+    <EnforceCodeStyleInBuild>true</EnforceCodeStyleInBuild>
+    <WarningsAsErrors>nullable</WarningsAsErrors>
+    <TreatWarningsAsErrors Condition="'$(ContinuousIntegrationBuild)' == 'true'">true</TreatWarningsAsErrors>
+  </PropertyGroup>
+
+  <PropertyGroup Label="NuGet Package Info">
+    <Authors>The Geekeey Team</Authors>
+    <Copyright>Copyright (c) The Geekeey Team 2026</Copyright>
+    <PublishRepositoryUrl>true</PublishRepositoryUrl>
+    <IncludeSymbols>true</IncludeSymbols>
+    <SymbolPackageFormat>snupkg</SymbolPackageFormat>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.SourceLink.Gitea" PrivateAssets="all" />
+  </ItemGroup>
+
+  <PropertyGroup>
+    <NuGetAuditLevel>moderate</NuGetAuditLevel>
+    <NuGetAuditMode>all</NuGetAuditMode>
+  </PropertyGroup>
+</Project>

Directory.Build.targets

@@ -0,0 +1,2 @@
+<Project>
+</Project>

Directory.Packages.props

@@ -0,0 +1,12 @@
+<Project>
+  <PropertyGroup>
+    <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
+  </PropertyGroup>
+  <ItemGroup>
+    <PackageVersion Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="10.0.6" />
+    <PackageVersion Include="Microsoft.Extensions.DependencyInjection" Version="10.0.6" />
+    <PackageVersion Include="Microsoft.Extensions.Options" Version="10.0.6" />
+    <PackageVersion Include="Microsoft.SourceLink.Gitea" Version="10.0.102" />
+    <PackageVersion Include="TUnit" Version="1.11.51" />
+  </ItemGroup>
+</Project>

LICENSE.md

@@ -0,0 +1,287 @@
+                      EUROPEAN UNION PUBLIC LICENCE v. 1.2
+                      EUPL © the European Union 2007, 2016
+
+This European Union Public Licence (the ‘EUPL’) applies to the Work (as defined
+below) which is provided under the terms of this Licence. Any use of the Work,
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+
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+
+        Licensed under the EUPL
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+
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+Copyleft clause: If the Licensee distributes or communicates copies of the
+Original Works or Derivative Works, this Distribution or Communication will be
+done under the terms of this Licence or of a later version of this Licence
+unless the Original Work is expressly distributed only under this version of the
+Licence — for example by communicating ‘EUPL v. 1.2 only’. The Licensee
+(becoming Licensor) cannot offer or impose any additional terms or conditions on
+the Work or Derivative Work that alter or restrict the terms of the Licence.
+
+Compatibility clause: If the Licensee Distributes or Communicates Derivative
+Works or copies thereof based upon both the Work and another work licensed under
+a Compatible Licence, this Distribution or Communication can be done under the
+terms of this Compatible Licence. For the sake of this clause, ‘Compatible
+Licence’ refers to the licences listed in the appendix attached to this Licence.
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+13. Miscellaneous
+
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+
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+
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+
+All linguistic versions of this Licence, approved by the European Commission,
+have identical value. Parties can take advantage of the linguistic version of
+their choice.
+
+14. Jurisdiction
+
+Without prejudice to specific agreement between parties,
+
+- any litigation resulting from the interpretation of this License, arising
+  between the European Union institutions, bodies, offices or agencies, as a
+  Licensor, and any Licensee, will be subject to the jurisdiction of the Court
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+
+- any litigation arising between other parties and resulting from the
+  interpretation of this License, will be subject to the exclusive jurisdiction
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+
+15. Applicable Law
+
+Without prejudice to specific agreement between parties,
+
+- this Licence shall be governed by the law of the European Union Member State
+  where the Licensor has his seat, resides or has his registered office,
+
+- this licence shall be governed by Belgian law if the Licensor has no seat,
+  residence or registered office inside a European Union Member State.
+
+Appendix
+
+‘Compatible Licences’ according to Article 5 EUPL are:
+
+- GNU General Public License (GPL) v. 2, v. 3
+- GNU Affero General Public License (AGPL) v. 3
+- Open Software License (OSL) v. 2.1, v. 3.0
+- Eclipse Public License (EPL) v. 1.0
+- CeCILL v. 2.0, v. 2.1
+- Mozilla Public Licence (MPL) v. 2
+- GNU Lesser General Public Licence (LGPL) v. 2.1, v. 3
+- Creative Commons Attribution-ShareAlike v. 3.0 Unported (CC BY-SA 3.0) for
+  works other than software
+- European Union Public Licence (EUPL) v. 1.1, v. 1.2
+- Québec Free and Open-Source Licence — Reciprocity (LiLiQ-R) or Strong
+  Reciprocity (LiLiQ-R+).
+
+The European Commission may update this Appendix to later versions of the above
+licences without producing a new version of the EUPL, as long as they provide
+the rights granted in Article 2 of this Licence and protect the covered Source
+Code from exclusive appropriation.
+
+All other changes or additions to this Appendix require the production of a new
+EUPL version.

README.md

@@ -0,0 +1,72 @@
+# `Geekeey.Request`
+
+Simple mediator implementation in .NET with minimal dependencies.
+
+## Features
+
+- **Simple interfaces:** no complex constraints, just marker interfaces that work.
+- **Minmal dependencies:** only depends on `Microsoft.Extensions.DependencyInjection.Abstractions` and the
+  `Microsoft.Extensions.Options` package.
+
+## Getting Started
+
+### Install the NuGet package:
+
+```shell
+dotnet add package Geekeey.Request
+```
+
+You may need to add our NuGet feed to your `nuget.config` this can be done by running the following command:
+
+```shell
+dotnet nuget add source -n geekeey https://code.geekeey.de/api/packages/geekeey/nuget/index.json
+```
+
+### Usage
+
+```csharp
+public static Task<int> Main()
+{
+  var collection = new ServiceCollection();
+  collection.AddRequestDispatcher(builder => builder
+      .Add(typeof(ScalarHandler))
+      .Add(typeof(ScalarBehavior)));
+  await using var provider = collection.BuildServiceProvider();
+  var dispatcher = provider.GetRequiredService<IRequestDispatcher>();
+
+  var request = new ScalarRequest { Value = "Hello" };
+  var result = await dispatcher.DispatchAsync(request);
+
+  Console.WriteLine(result);
+  return 0;
+}
+
+public class ScalarRequest : IScalarRequest<string>
+{
+  public string Value { get; set; } = string.Empty;
+}
+
+public class ScalarHandler : IScalarRequestHandler<ScalarTestRequest, string>
+{
+  public Task<string> HandleAsync(ScalarTestRequest request, CancellationToken cancellationToken)
+  {
+    return Task.FromResult($"{request.Value} World");
+  }
+}
+
+public class ScalarBehavior : IScalarRequestBehavior<ScalarTestRequest, string>
+{
+  public async Task<string> HandleAsync(ScalarTestRequest request, ScalarHandlerDelegate<string> next, CancellationToken cancellationToken)
+  {
+    Console.WriteLine("Before");
+    var result = await next(request, cancellationToken);
+    Console.WriteLine("After");
+    return result;
+  }
+}
+```
+
+## Behaviour of the Handlers
+
+Handlers are resolved from either the DI conatiner or are created on the fly but can receive arguments from the DI
+container when being constructed. The same also applied for the request pipeline behaviours.

global.json

@@ -0,0 +1,11 @@
+{
+	"$schema": "https://www.schemastore.org/global.json",
+	"sdk": {
+		"version": "10.0.0",
+		"rollForward": "latestMinor"
+	},
+	"msbuild-sdks": {},
+	"test": {
+		"runner": "Microsoft.Testing.Platform"
+	}
+}

nuget.config

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+  <config>
+    <add key="defaultPushSource" value="geekeey" />
+  </config>
+  <packageSources>
+    <clear />
+    <add key="nuget" value="https://api.nuget.org/v3/index.json" />
+    <add key="geekeey" value="https://code.geekeey.de/api/packages/geekeey/nuget/index.json" />
+  </packageSources>
+  <packageSourceMapping>
+    <packageSource key="nuget">
+      <package pattern="*" />
+    </packageSource>
+    <packageSource key="geekeey">
+      <package pattern="Geekeey.*" />
+    </packageSource>
+  </packageSourceMapping>
+</configuration>

request.slnx

@@ -0,0 +1,6 @@
+<Solution>
+  <Project Path="src/request/Geekeey.Request.csproj" />
+  <Project Path="src/request.tests/Geekeey.Request.Tests.csproj" />
+  <Project Path="src/request.result/Geekeey.Request.Result.csproj" />
+  <Project Path="src/request.result.tests/Geekeey.Request.Result.Tests.csproj" />
+</Solution>

src/request.result.tests/.editorconfig

@@ -0,0 +1,9 @@
+
+[*.{cs,vb}]
+# disable CA1822: Mark members as static
+# -> TUnit requiring instance methods for test cases
+dotnet_diagnostic.CA1822.severity = none
+# disable CA1707: Identifiers should not contain underscores
+dotnet_diagnostic.CA1707.severity = none
+# disable IDE0060: Remove unused parameter
+dotnet_diagnostic.IDE0060.severity = none

src/request.result.tests/ErrorTests.cs

@@ -0,0 +1,27 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Result.Tests;
+
+internal sealed class ErrorTests
+{
+	[Test]
+	public async Task I_can_implicitly_convert_from_string_and_get_string_error()
+	{
+		Error error = "error";
+
+		using var scope = Assert.Multiple();
+		await Assert.That(error).IsTypeOf<StringError>();
+		await Assert.That(error.Message).IsEqualTo("error");
+	}
+
+	[Test]
+	public async Task I_can_implicitly_convert_from_exception_and_get_exception_error()
+	{
+		Error error = new CustomTestException();
+
+		using var scope = Assert.Multiple();
+		var instance = await Assert.That(error).IsTypeOf<ExceptionError>();
+		await Assert.That(instance?.Exception).IsTypeOf<CustomTestException>();
+	}
+}

src/request.result.tests/ExtensionsEnumerableTests.cs

@@ -0,0 +1,50 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Result.Tests;
+
+internal sealed class ExtensionsEnumerableTests
+{
+	[Test]
+	public async Task I_can_join_sequence_and_get_all_success_when_all_elements_are_success()
+	{
+		IEnumerable<Result<int>> xs = [1, 2, 3, 4, 5];
+
+		var result = xs.Join();
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsTrue();
+		await Assert.That(result.Value).IsEquivalentTo([1, 2, 3, 4, 5]);
+	}
+
+	[Test]
+	public async Task I_can_join_sequence_and_get_first_failure_when_sequence_contains_failure()
+	{
+		IEnumerable<Result<int>> xs =
+		[
+			Prelude.Success(1),
+			Prelude.Success(2),
+			Prelude.Failure<int>("error 1"),
+			Prelude.Success(4),
+			Prelude.Failure<int>("error 2")
+		];
+
+		var result = xs.Join();
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		await Assert.That(result.Error?.Message).IsEqualTo("error 1");
+	}
+
+	[Test]
+	public async Task I_can_join_empty_sequence_and_get_success()
+	{
+		IEnumerable<Result<int>> xs = [];
+
+		var result = xs.Join();
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsTrue();
+		await Assert.That(result.Value).IsEmpty();
+	}
+}

src/request.result.tests/Geekeey.Request.Result.Tests.csproj

@@ -0,0 +1,21 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net10.0</TargetFramework>
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="TUnit" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <AssemblyAttribute Include="System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverageAttribute" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\request.result\Geekeey.Request.Result.csproj" />
+  </ItemGroup>
+
+</Project>

src/request.result.tests/PreludeTests.cs

@@ -0,0 +1,100 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Result.Tests;
+
+internal sealed class PreludeTests
+{
+	[Test]
+	public async Task I_can_try_with_success_value_and_get_a_success_result()
+	{
+		var result = Prelude.Try(() => 2);
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsTrue();
+		await Assert.That(result.Value).IsEqualTo(2);
+	}
+
+	[Test]
+	public async Task I_can_try_with_throwing_exception_and_get_a_failure_result()
+	{
+		var result = Prelude.Try<int>(() => throw new CustomTestException());
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		var instance = await Assert.That(result.Error).IsTypeOf<ExceptionError>();
+		await Assert.That(instance?.Exception).IsTypeOf<CustomTestException>();
+	}
+
+	[Test]
+	public async Task I_can_try_with_async_success_value_and_get_a_success_result()
+	{
+		var result = await Prelude.TryAsync(() => Task.FromResult(2));
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsTrue();
+		await Assert.That(result.Value).IsEqualTo(2);
+	}
+
+	[Test]
+	public async Task I_can_try_with_async_throwing_exception_and_get_a_failure_result()
+	{
+		var result = await Prelude.TryAsync(Task<int> () => throw new CustomTestException());
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		var instance = await Assert.That(result.Error).IsTypeOf<ExceptionError>();
+		await Assert.That(instance?.Exception).IsTypeOf<CustomTestException>();
+	}
+
+	[Test]
+	public async Task I_can_try_with_async_await_throwing_exception_and_get_a_failure_result()
+	{
+		var result = await Prelude.TryAsync(async Task<int> () =>
+		{
+			await Task.CompletedTask;
+			throw new CustomTestException();
+		});
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		var instance = await Assert.That(result.Error).IsTypeOf<ExceptionError>();
+		await Assert.That(instance?.Exception).IsTypeOf<CustomTestException>();
+	}
+
+	[Test]
+	public async Task I_can_try_with_async_success_value_and_get_a_success_result_of_type_ValueTask()
+	{
+		var result = await Prelude.TryAsync(() => ValueTask.FromResult(2));
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsTrue();
+		await Assert.That(result.Value).IsEqualTo(2);
+	}
+
+	[Test]
+	public async Task I_can_try_with_async_throwing_exception_and_get_a_failure_result_of_type_ValueTask()
+	{
+		var result = await Prelude.TryAsync(ValueTask<int> () => throw new CustomTestException());
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		var instance = await Assert.That(result.Error).IsTypeOf<ExceptionError>();
+		await Assert.That(instance?.Exception).IsTypeOf<CustomTestException>();
+	}
+
+	[Test]
+	public async Task I_can_try_with_async_await_throwing_exception_and_get_a_failure_result_of_type_ValueTask()
+	{
+		var result = await Prelude.TryAsync(async ValueTask<int> () =>
+		{
+			await Task.CompletedTask;
+			throw new CustomTestException();
+		});
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		var instance = await Assert.That(result.Error).IsTypeOf<ExceptionError>();
+		await Assert.That(instance?.Exception).IsTypeOf<CustomTestException>();
+	}
+}

src/request.result.tests/ResultConversionTests.cs

@@ -0,0 +1,64 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Result.Tests;
+
+internal sealed class ResultConversionTests
+{
+	[Test]
+	public async Task I_can_implicitly_convert_from_value_and_get_success()
+	{
+		var result = Prelude.Success(2);
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsTrue();
+		await Assert.That(result.IsFailure).IsFalse();
+		await Assert.That(result.Value).IsEqualTo(2);
+	}
+
+	[Test]
+	public async Task I_can_implicitly_convert_from_error_and_get_failure()
+	{
+		var error = new CustomTestError();
+		var result = Prelude.Failure<int>(error);
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		await Assert.That(result.IsFailure).IsTrue();
+		await Assert.That(result.Error).IsTypeOf<CustomTestError>();
+	}
+
+	[Test]
+	public async Task I_can_unwrap_and_get_value_for_success()
+	{
+		var result = Prelude.Success(2);
+		var value = result.Unwrap();
+
+		await Assert.That(value).IsEqualTo(2);
+	}
+
+	[Test]
+	public async Task I_can_unwrap_and_get_exception_for_failure()
+	{
+		var result = Prelude.Failure<int>("error");
+
+		await Assert.That(result.Unwrap).Throws<UnwrapException>();
+	}
+
+	[Test]
+	public async Task I_can_explicitly_convert_and_get_value_for_success()
+	{
+		var result = Prelude.Success(2);
+		var value = (int)result;
+
+		await Assert.That(value).IsEqualTo(2);
+	}
+
+	[Test]
+	public async Task I_can_explicitly_convert_and_get_exception_for_failure()
+	{
+		var result = Prelude.Failure<int>("error");
+
+		await Assert.That(() => (int)result).Throws<UnwrapException>();
+	}
+}

src/request.result.tests/ResultEqualityTests.cs

@@ -0,0 +1,175 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Result.Tests;
+
+internal sealed class ResultEqualityTests
+{
+	[Test]
+	public async Task I_can_equal_t_and_get_true_for_success_with_equal_value()
+	{
+		var a = Prelude.Success(2);
+		var b = 2;
+
+		await Assert.That(a.Equals(b)).IsTrue();
+	}
+
+	[Test]
+	public async Task I_can_equal_t_and_get_false_for_success_with_unequal_value()
+	{
+		var a = Prelude.Success(2);
+		var b = 3;
+
+		await Assert.That(a.Equals(b)).IsFalse();
+	}
+
+	[Test]
+	public async Task I_can_equal_t_and_get_false_for_failure()
+	{
+		var a = Prelude.Failure<int>("error");
+		var b = 2;
+
+		await Assert.That(a.Equals(b)).IsFalse();
+	}
+
+	[Test]
+	public async Task I_can_equal_result_and_get_true_for_success_and_success_with_equal_value()
+	{
+		var a = Prelude.Success(2);
+		var b = Prelude.Success(2);
+
+		await Assert.That(a.Equals(b)).IsTrue();
+	}
+
+	[Test]
+	public async Task I_can_equal_result_and_get_false_for_success_and_success_with_unequal_value()
+	{
+		var a = Prelude.Success(2);
+		var b = Prelude.Success(3);
+
+		await Assert.That(a.Equals(b)).IsFalse();
+	}
+
+	[Test]
+	public async Task I_can_equals_result_and_get_false_for_success_and_failure()
+	{
+		var a = Prelude.Success(2);
+		var b = Prelude.Failure<int>("error 1");
+
+		await Assert.That(a.Equals(b)).IsFalse();
+	}
+
+	[Test]
+	public async Task I_can_equals_result_and_get_false_for_failure_and_success()
+	{
+		var a = Prelude.Failure<int>("error");
+		var b = Prelude.Success(2);
+
+		await Assert.That(a.Equals(b)).IsFalse();
+	}
+
+	[Test]
+	public async Task I_can_equals_result_and_get_true_for_failure_and_failure()
+	{
+		var a = Prelude.Failure<int>("error 1");
+		var b = Prelude.Failure<int>("error 2");
+
+		await Assert.That(a.Equals(b)).IsTrue();
+	}
+
+	[Test]
+	public async Task I_can_equal_t_and_get_true_for_success_with_equal_value_using_comparer()
+	{
+		var a = Prelude.Success(2);
+		var b = 2;
+
+		await Assert.That(a.Equals(b, EqualityComparer<int>.Default)).IsTrue();
+	}
+
+	[Test]
+	public async Task I_can_equal_t_and_get_false_for_success_with_unequal_value_using_comparer()
+	{
+		var a = Prelude.Success(2);
+		var b = 3;
+
+		await Assert.That(a.Equals(b, EqualityComparer<int>.Default)).IsFalse();
+	}
+
+	[Test]
+	public async Task I_can_equal_t_and_get_false_for_failure_using_comparer()
+	{
+		var a = Prelude.Failure<int>("error");
+		var b = 2;
+
+		await Assert.That(a.Equals(b, EqualityComparer<int>.Default)).IsFalse();
+	}
+
+	[Test]
+	public async Task I_can_equal_result_and_get_true_for_success_and_success_with_equal_value_using_comparer()
+	{
+		var a = Prelude.Success(2);
+		var b = Prelude.Success(2);
+
+		await Assert.That(a.Equals(b, EqualityComparer<int>.Default)).IsTrue();
+	}
+
+	[Test]
+	public async Task I_can_equal_result_and_get_false_for_success_and_success_with_unequal_value_using_comparer()
+	{
+		var a = Prelude.Success(2);
+		var b = Prelude.Success(3);
+
+		await Assert.That(a.Equals(b, EqualityComparer<int>.Default)).IsFalse();
+	}
+
+	[Test]
+	public async Task I_can_equals_result_and_get_false_for_success_and_failure_using_comparer()
+	{
+		var a = Prelude.Success(2);
+		var b = Prelude.Failure<int>("error 1");
+
+		await Assert.That(a.Equals(b, EqualityComparer<int>.Default)).IsFalse();
+	}
+
+	[Test]
+	public async Task I_can_equals_result_and_get_false_for_failure_and_success_using_comparer()
+	{
+		var a = Prelude.Failure<int>("error");
+		var b = Prelude.Success(2);
+
+		await Assert.That(a.Equals(b, EqualityComparer<int>.Default)).IsFalse();
+	}
+
+	[Test]
+	public async Task I_can_equals_result_and_get_true_for_failure_and_failure_using_comparer()
+	{
+		var a = Prelude.Failure<int>("error 1");
+		var b = Prelude.Failure<int>("error 2");
+
+		await Assert.That(a.Equals(b, EqualityComparer<int>.Default)).IsTrue();
+	}
+
+	[Test]
+	public async Task I_can_get_hashcode_and_get_hashcode_for_success()
+	{
+		var result = Prelude.Success(2);
+
+		await Assert.That(result.GetHashCode()).IsEqualTo(2.GetHashCode());
+	}
+
+	[Test]
+	public async Task I_can_get_hashcode_and_get_zero_for_null()
+	{
+		var result = Prelude.Success<string?>(null);
+
+		await Assert.That(result.GetHashCode()).IsZero();
+	}
+
+	[Test]
+	public async Task I_can_get_hashcode_and_get_zero_for_failure()
+	{
+		var result = Prelude.Failure<int>("error");
+
+		await Assert.That(result.GetHashCode()).IsZero();
+	}
+}

src/request.result.tests/ResultMatchingTests.cs

@@ -0,0 +1,232 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Result.Tests;
+
+internal sealed class ResultMatchingTests
+{
+	[Test]
+	public async Task I_can_match_and_it_calls_success_func_for_success()
+	{
+		var result = Prelude.Success(2);
+		var match = result.Match(
+			v => v,
+			_ => throw new InvalidOperationException());
+
+		await Assert.That(match).IsEqualTo(2);
+	}
+
+	[Test]
+	public async Task I_can_match_and_it_calls_failure_func_for_failure()
+	{
+		var result = Prelude.Failure<int>("error");
+		var match = result.Match(
+			_ => throw new InvalidOperationException(),
+			e => e);
+
+		await Assert.That(match.Message).IsEqualTo("error");
+	}
+
+	[Test]
+	public async Task I_can_switch_and_it_calls_success_action_for_success()
+	{
+		var called = false;
+		var value = default(int);
+
+		var result = Prelude.Success(2);
+		result.Switch(OnSuccess, OnFailure);
+
+		await Assert.That(called).IsTrue();
+		await Assert.That(value).IsEqualTo(2);
+
+		return;
+
+		void OnSuccess(int i)
+		{
+			value = i;
+			called = true;
+		}
+
+		void OnFailure(Error e)
+		{
+			throw new InvalidOperationException();
+		}
+	}
+
+	[Test]
+	public async Task I_can_switch_and_it_calls_failure_action_for_failure()
+	{
+		var called = false;
+		var value = default(Error);
+
+		var result = Prelude.Failure<int>("error");
+		result.Switch(OnSuccess, OnFailure);
+
+		await Assert.That(called).IsTrue();
+		await Assert.That(value?.Message).IsEqualTo("error");
+
+		return;
+
+		void OnSuccess(int i)
+		{
+			throw new InvalidOperationException();
+		}
+
+		void OnFailure(Error e)
+		{
+			value = e;
+			called = true;
+		}
+	}
+
+	[Test]
+	public async Task I_can_match_async_and_it_calls_success_func_for_success()
+	{
+		var result = Prelude.Success(2);
+		var match = await result.MatchAsync(
+			Task.FromResult,
+			_ => throw new InvalidOperationException());
+
+		await Assert.That(match).IsEqualTo(2);
+	}
+
+	[Test]
+	public async Task I_can_match_async_and_it_calls_failure_func_for_failure()
+	{
+		var result = Prelude.Failure<int>("error");
+		var match = await result.MatchAsync(
+			_ => throw new InvalidOperationException(),
+			Task.FromResult);
+
+		await Assert.That(match.Message).IsEqualTo("error");
+	}
+
+	[Test]
+	public async Task I_can_switch_async_and_it_calls_success_action_for_success()
+	{
+		var called = false;
+		var value = default(int);
+
+		var result = Prelude.Success(2);
+		await result.SwitchAsync(OnSuccess, OnFailure);
+
+		await Assert.That(called).IsTrue();
+		await Assert.That(value).IsEqualTo(2);
+		return;
+
+		Task OnSuccess(int i)
+		{
+			value = i;
+			called = true;
+			return Task.CompletedTask;
+		}
+
+		Task OnFailure(Error e)
+		{
+			throw new InvalidOperationException();
+		}
+	}
+
+	[Test]
+	public async Task I_can_switch_async_and_it_calls_failure_action_for_failure()
+	{
+		var called = false;
+		var value = default(Error);
+
+		var result = Prelude.Failure<int>("error");
+		await result.SwitchAsync(OnSuccess, OnFailure);
+
+		await Assert.That(called).IsTrue();
+		await Assert.That(value?.Message).IsEqualTo("error");
+
+		return;
+
+		Task OnSuccess(int i)
+		{
+			throw new InvalidOperationException();
+		}
+
+		Task OnFailure(Error e)
+		{
+			value = e;
+			called = true;
+			return Task.CompletedTask;
+		}
+	}
+
+	[Test]
+	public async Task I_can_match_and_it_calls_success_func_for_success_ValueTask()
+	{
+		var result = Prelude.Success(2);
+		var match = await result.MatchAsync(
+			ValueTask.FromResult,
+			_ => throw new InvalidOperationException());
+
+		await Assert.That(match).IsEqualTo(2);
+	}
+
+	[Test]
+	public async Task I_can_match_async_and_it_calls_failure_func_for_failure_ValueTask()
+	{
+		var result = Prelude.Failure<int>("error");
+		var match = await result.MatchAsync(
+			_ => throw new InvalidOperationException(),
+			ValueTask.FromResult);
+
+		await Assert.That(match.Message).IsEqualTo("error");
+	}
+
+	[Test]
+	public async Task I_can_switch_async_and_it_calls_success_action_for_success_ValueTask()
+	{
+		var called = false;
+		var value = default(int);
+
+		var result = Prelude.Success(2);
+		await result.SwitchAsync(OnSuccess, OnFailure);
+
+		await Assert.That(called).IsTrue();
+		await Assert.That(value).IsEqualTo(2);
+
+		return;
+
+		ValueTask OnSuccess(int i)
+		{
+			value = i;
+			called = true;
+			return ValueTask.CompletedTask;
+		}
+
+		ValueTask OnFailure(Error e)
+		{
+			throw new InvalidOperationException();
+		}
+	}
+
+	[Test]
+	public async Task I_can_switch_async_and_it_calls_failure_action_for_failure_ValueTask()
+	{
+		var called = false;
+		var value = default(Error);
+
+		var result = Prelude.Failure<int>("error");
+		await result.SwitchAsync(OnSuccess, OnFailure);
+
+		await Assert.That(called).IsTrue();
+		await Assert.That(value?.Message).IsEqualTo("error");
+
+		return;
+
+		ValueTask OnSuccess(int i)
+		{
+			throw new InvalidOperationException();
+		}
+
+		ValueTask OnFailure(Error e)
+		{
+			value = e;
+			called = true;
+			return ValueTask.CompletedTask;
+		}
+	}
+}

src/request.result.tests/ResultTests.cs

@@ -0,0 +1,59 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Result.Tests;
+
+internal sealed class ResultTests
+{
+	[Test]
+	public async Task I_can_create_new_success_result_from_t()
+	{
+		var result = new Result<int>(1);
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsTrue();
+		await Assert.That(result.IsFailure).IsFalse();
+		await Assert.That(result.Value).IsNotEqualTo(default);
+		await Assert.That(result.Error).IsNull();
+	}
+
+	[Test]
+	public async Task I_can_create_new_failure_result_from_error()
+	{
+		var result = new Result<int>(new CustomTestError());
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		await Assert.That(result.IsFailure).IsTrue();
+		await Assert.That(result.Value).IsEqualTo(default(int));
+		await Assert.That(result.Error).IsTypeOf<CustomTestError>();
+	}
+
+	[Test]
+	public async Task I_can_distinguish_default_result_from_created()
+	{
+		var result = default(Result<int>);
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		await Assert.That(result.IsFailure).IsTrue();
+		await Assert.That(result.Value).IsEqualTo(default(int));
+		await Assert.That(result.Error).IsEqualTo(Error.DefaultValueError);
+	}
+
+	[Test]
+	public async Task I_can_to_string_success_result_value()
+	{
+		Result<int> result = 2;
+
+		await Assert.That(result.ToString()).IsEqualTo("Success { 2 }");
+	}
+
+	[Test]
+	public async Task I_can_to_string_failure_result_value()
+	{
+		Result<int> result = new StringError("error");
+
+		await Assert.That(result.ToString()).IsEqualTo("Failure { error }");
+	}
+}

src/request.result.tests/ResultTransformTests.cs

@@ -0,0 +1,644 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+using System.Globalization;
+
+namespace Geekeey.Request.Result.Tests;
+
+internal sealed class ResultTransformTests
+{
+	[Test]
+	public async Task I_can_map_and_it_returns_success_for_success()
+	{
+		var start = Prelude.Success(2);
+		var result = start.Map(value => value.ToString(CultureInfo.InvariantCulture));
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsTrue();
+		await Assert.That(result.Value).IsEqualTo("2");
+	}
+
+	[Test]
+	public async Task I_can_map_and_it_returns_failure_for_failure()
+	{
+		var start = Prelude.Failure<int>("error");
+		var result = start.Map(value => value.ToString(CultureInfo.InvariantCulture));
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		await Assert.That(result.Error?.Message).IsEqualTo("error");
+	}
+
+	[Test]
+	public async Task I_can_transform_result_with_then_and_it_returns_success_for_success_and_mapping_returning_success()
+	{
+		var start = Prelude.Success(2);
+		var result = start.Then(value => Prelude.Success(value.ToString(CultureInfo.InvariantCulture)));
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsTrue();
+		await Assert.That(result.Value).IsEqualTo("2");
+	}
+
+	[Test]
+	public async Task I_can_transform_result_with_then_and_it_returns_failure_for_success_and_mapping_returning_failure()
+	{
+		var start = Prelude.Success(2);
+		var result = start.Then(_ => Prelude.Failure<string>("error"));
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		await Assert.That(result.Error?.Message).IsEqualTo("error");
+	}
+
+	[Test]
+	public async Task I_can_transform_result_with_then_and_it_returns_failure_for_failure_and_mapping_returning_success()
+	{
+		var start = Prelude.Failure<int>("error");
+		var result = start.Then(value => Prelude.Success(value.ToString(CultureInfo.InvariantCulture)));
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		await Assert.That(result.Error?.Message).IsEqualTo("error");
+	}
+
+	[Test]
+	public async Task I_can_transform_result_with_then_and_it_returns_failure_for_failure_and_mapping_returning_failure()
+	{
+		var start = Prelude.Failure<int>("error");
+		var result = start.Then(_ => Prelude.Failure<int>("error 2"));
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		await Assert.That(result.Error?.Message).IsEqualTo("error");
+	}
+
+	[Test]
+	public async Task I_can_try_map_and_it_returns_success_for_success_without_throwing()
+	{
+		var start = Prelude.Success(2);
+		var result = start.TryMap(value => value.ToString(CultureInfo.InvariantCulture));
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsTrue();
+		await Assert.That(result.Value).IsEqualTo("2");
+	}
+
+	[Test]
+	public async Task I_can_try_map_and_it_returns_failure_for_failure_without_throwing()
+	{
+		var start = Prelude.Failure<int>("error");
+		var result = start.TryMap(value => value.ToString(CultureInfo.InvariantCulture));
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		await Assert.That(result.Error?.Message).IsEqualTo("error");
+	}
+
+	[Test]
+	public async Task I_can_try_map_and_it_returns_failure_for_success_with_throwing()
+	{
+		var start = Prelude.Success(2);
+		var result = start.TryMap<string>(_ => throw new CustomTestException());
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		var instance = await Assert.That(result.Error).IsTypeOf<ExceptionError>();
+		await Assert.That(instance?.Exception).IsTypeOf<CustomTestException>();
+	}
+
+	[Test]
+	public async Task I_can_try_map_and_it_returns_failure_for_failure_with_throwing()
+	{
+		var start = Prelude.Failure<int>("error");
+		var result = start.TryMap<string>(_ => throw new CustomTestException());
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		await Assert.That(result.Error).IsTypeOf<StringError>();
+		await Assert.That(result.Error?.Message).IsEqualTo("error");
+	}
+
+	[Test]
+	public async Task I_can_try_transform_result_with_then_and_it_returns_success_for_success_and_mapping_returning_success()
+	{
+		var start = Prelude.Success(2);
+		var result = start.ThenTry(value => Prelude.Success(value.ToString(CultureInfo.InvariantCulture)));
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsTrue();
+		await Assert.That(result.Value).IsEqualTo("2");
+	}
+
+	[Test]
+	public async Task I_can_try_transform_result_with_then_and_it_returns_failure_for_success_and_mapping_returning_failure()
+	{
+		var start = Prelude.Success(2);
+		var result = start.ThenTry(_ => Prelude.Failure<string>("error"));
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		await Assert.That(result.Error?.Message).IsEqualTo("error");
+	}
+
+	[Test]
+	public async Task I_can_try_transform_result_with_then_and_it_returns_failure_for_failure_and_mapping_returning_failure()
+	{
+		var start = Prelude.Failure<int>("error");
+		var result = start.ThenTry(x => Prelude.Success(x.ToString(CultureInfo.InvariantCulture)));
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		await Assert.That(result.Error?.Message).IsEqualTo("error");
+	}
+
+	[Test]
+	public async Task I_can_try_transform_result_with_then_and_it_returns_failure_for_success_and_mapping_throwing()
+	{
+		var start = Prelude.Success(2);
+		var result = start.ThenTry<string>(_ => throw new CustomTestException());
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		var instance = await Assert.That(result.Error).IsTypeOf<ExceptionError>();
+		await Assert.That(instance?.Exception).IsTypeOf<CustomTestException>();
+	}
+
+	[Test]
+	public async Task I_can_try_transform_result_with_then_and_it_returns_failure_for_failure_and_mapping_throwing()
+	{
+		var start = Prelude.Failure<int>("error");
+		var result = start.ThenTry<string>(_ => throw new CustomTestException());
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		await Assert.That(result.Error).IsTypeOf<StringError>();
+		await Assert.That(result.Error?.Message).IsEqualTo("error");
+	}
+
+	[Test]
+	public async Task I_can_map_async_and_it_returns_success_for_success()
+	{
+		var start = Prelude.Success(2);
+		var result = await start.MapAsync(value => Task.FromResult(value.ToString(CultureInfo.InvariantCulture)));
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsTrue();
+		await Assert.That(result.Value).IsEqualTo("2");
+	}
+
+	[Test]
+	public async Task I_can_map_async_and_it_returns_failure_for_failure()
+	{
+		var start = Prelude.Failure<int>("error");
+		var result = await start.MapAsync(value => Task.FromResult(value.ToString(CultureInfo.InvariantCulture)));
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		await Assert.That(result.Error?.Message).IsEqualTo("error");
+	}
+
+	[Test]
+	public async Task I_can_transform_result_async_with_then_and_it_returns_success_for_success_and_mapping_returning_success()
+	{
+		var start = Prelude.Success(2);
+		var result = await start.ThenAsync(value => Task.FromResult(Prelude.Success(value.ToString(CultureInfo.InvariantCulture))));
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsTrue();
+		await Assert.That(result.Value).IsEqualTo("2");
+	}
+
+	[Test]
+	public async Task I_can_transform_result_async_with_then_and_it_returns_failure_for_success_and_mapping_returning_failure()
+	{
+		var start = Prelude.Success(2);
+		var result = await start.ThenAsync(_ => Task.FromResult(Prelude.Failure<string>("error")));
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		await Assert.That(result.Error?.Message).IsEqualTo("error");
+	}
+
+	[Test]
+	public async Task I_can_transform_result_async_with_then_and_it_returns_failure_for_failure_and_mapping_returning_success()
+	{
+		var start = Prelude.Failure<int>("error");
+		var result = await start.ThenAsync(value => Task.FromResult(Prelude.Success(value.ToString(CultureInfo.InvariantCulture))));
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		await Assert.That(result.Error?.Message).IsEqualTo("error");
+	}
+
+	[Test]
+	public async Task I_can_transform_result_async_with_then_and_it_returns_failure_for_failure_and_mapping_returning_failure()
+	{
+		var start = Prelude.Failure<int>("error");
+		var result = await start.ThenAsync(_ => Task.FromResult(Prelude.Failure<int>("error 2")));
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		await Assert.That(result.Error?.Message).IsEqualTo("error");
+	}
+
+	[Test]
+	public async Task I_can_try_map_async_and_it_returns_success_for_success_without_throwing()
+	{
+		var start = Prelude.Success(2);
+		var result = await start.TryMapAsync(value => Task.FromResult(value.ToString(CultureInfo.InvariantCulture)));
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsTrue();
+		await Assert.That(result.Value).IsEqualTo("2");
+	}
+
+	[Test]
+	public async Task I_can_try_map_async_and_it_returns_failure_for_failure_without_throwing()
+	{
+		var start = Prelude.Failure<int>("error");
+		var result = await start.TryMapAsync(value => Task.FromResult(value.ToString(CultureInfo.InvariantCulture)));
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		await Assert.That(result.Error?.Message).IsEqualTo("error");
+	}
+
+	[Test]
+	public async Task I_can_try_map_async_and_it_returns_failure_for_success_with_throwing()
+	{
+		var start = Prelude.Success(2);
+		var result = await start.TryMapAsync(Task<string> (_) => throw new CustomTestException());
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		var instance = await Assert.That(result.Error).IsTypeOf<ExceptionError>();
+		await Assert.That(instance?.Exception).IsTypeOf<CustomTestException>();
+	}
+
+	[Test]
+	public async Task I_can_try_map_async_and_it_returns_failure_for_success_with_await_throwing()
+	{
+		var start = Prelude.Success(2);
+		var result = await start.TryMapAsync(async Task<string> (_) =>
+		{
+			await Task.CompletedTask;
+			throw new CustomTestException();
+		});
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		var instance = await Assert.That(result.Error).IsTypeOf<ExceptionError>();
+		await Assert.That(instance?.Exception).IsTypeOf<CustomTestException>();
+	}
+
+	[Test]
+	public async Task I_can_try_map_async_and_it_returns_failure_for_failure_with_throwing()
+	{
+		var start = Prelude.Failure<int>("error");
+		var result = await start.TryMapAsync(Task<string> (_) => throw new CustomTestException());
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		await Assert.That(result.Error).IsTypeOf<StringError>();
+		await Assert.That(result.Error?.Message).IsEqualTo("error");
+	}
+
+	[Test]
+	public async Task I_can_try_map_async_and_it_returns_failure_for_failure_with_await_throwing()
+	{
+		var start = Prelude.Failure<int>("error");
+		var result = await start.TryMapAsync(async Task<string> (_) =>
+		{
+			await Task.CompletedTask;
+			throw new CustomTestException();
+		});
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		await Assert.That(result.Error).IsTypeOf<StringError>();
+		await Assert.That(result.Error?.Message).IsEqualTo("error");
+	}
+
+	[Test]
+	public async Task I_can_try_transform_result_async_with_then_and_it_returns_success_for_success_and_mapping_returning_success()
+	{
+		var start = Prelude.Success(2);
+		var result = await start.ThenTryAsync(value => Task.FromResult(Prelude.Success(value.ToString(CultureInfo.InvariantCulture))));
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsTrue();
+		await Assert.That(result.Value).IsEqualTo("2");
+	}
+
+	[Test]
+	public async Task I_can_try_transform_result_async_with_then_and_it_returns_failure_for_success_and_mapping_returning_failure()
+	{
+		var start = Prelude.Success(2);
+		var result = await start.ThenTryAsync(_ => Task.FromResult(Prelude.Failure<string>("error")));
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		await Assert.That(result.Error?.Message).IsEqualTo("error");
+	}
+
+	[Test]
+	public async Task I_can_try_transform_result_async_with_then_and_it_returns_failure_for_failure_and_mapping_returning_failure()
+	{
+		var start = Prelude.Failure<int>("error");
+		var result = await start.ThenTryAsync(x => Task.FromResult(Prelude.Success(x.ToString(CultureInfo.InvariantCulture))));
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		await Assert.That(result.Error?.Message).IsEqualTo("error");
+	}
+
+	[Test]
+	public async Task I_can_try_transform_result_async_with_then_and_it_returns_failure_for_success_and_mapping_throwing()
+	{
+		var start = Prelude.Success(2);
+		var result = await start.ThenTryAsync(Task<Result<string>> (_) => throw new CustomTestException());
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		var instance = await Assert.That(result.Error).IsTypeOf<ExceptionError>();
+		await Assert.That(instance?.Exception).IsTypeOf<CustomTestException>();
+	}
+
+	[Test]
+	public async Task I_can_try_transform_result_async_with_then_and_it_returns_failure_for_success_and_mapping_await_throwing()
+	{
+		var start = Prelude.Success(2);
+		var result = await start.ThenTryAsync(async Task<Result<string>> (_) =>
+		{
+			await Task.CompletedTask;
+			throw new CustomTestException();
+		});
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		var instance = await Assert.That(result.Error).IsTypeOf<ExceptionError>();
+		await Assert.That(instance?.Exception).IsTypeOf<CustomTestException>();
+	}
+
+	[Test]
+	public async Task I_can_try_transform_result_async_with_then_and_it_returns_failure_for_failure_and_mapping_throwing()
+	{
+		var start = Prelude.Failure<int>("error");
+		var result = await start.ThenTryAsync(Task<Result<string>> (_) => throw new CustomTestException());
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		await Assert.That(result.Error).IsTypeOf<StringError>();
+		await Assert.That(result.Error?.Message).IsEqualTo("error");
+	}
+
+	[Test]
+	public async Task I_can_try_transform_result_async_with_then_and_it_returns_failure_for_failure_and_mapping_await_throwing()
+	{
+		var start = Prelude.Failure<int>("error");
+		var result = await start.ThenTryAsync(async Task<Result<string>> (_) =>
+		{
+			await Task.CompletedTask;
+			throw new CustomTestException();
+		});
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		await Assert.That(result.Error).IsTypeOf<StringError>();
+		await Assert.That(result.Error?.Message).IsEqualTo("error");
+	}
+
+	[Test]
+	public async Task I_can_map_async_and_it_returns_success_for_success_ValueTask()
+	{
+		var start = Prelude.Success(2);
+		var result = await start.MapAsync(value => ValueTask.FromResult(value.ToString(CultureInfo.InvariantCulture)));
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsTrue();
+		await Assert.That(result.Value).IsEqualTo("2");
+	}
+
+	[Test]
+	public async Task I_can_map_async_and_it_returns_failure_for_failure_ValueTask()
+	{
+		var start = Prelude.Failure<int>("error");
+		var result = await start.MapAsync(value => ValueTask.FromResult(value.ToString(CultureInfo.InvariantCulture)));
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		await Assert.That(result.Error?.Message).IsEqualTo("error");
+	}
+
+	[Test]
+	public async Task I_can_transform_result_async_with_then_and_it_returns_success_for_success_and_mapping_returning_success_ValueTask()
+	{
+		var start = Prelude.Success(2);
+		var result = await start.ThenAsync(value => ValueTask.FromResult(Prelude.Success(value.ToString(CultureInfo.InvariantCulture))));
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsTrue();
+		await Assert.That(result.Value).IsEqualTo("2");
+	}
+
+	[Test]
+	public async Task I_can_transform_result_async_with_then_and_it_returns_failure_for_success_and_mapping_returning_failure_ValueTask()
+	{
+		var start = Prelude.Success(2);
+		var result = await start.ThenAsync(_ => ValueTask.FromResult(Prelude.Failure<string>("error")));
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		await Assert.That(result.Error?.Message).IsEqualTo("error");
+	}
+
+	[Test]
+	public async Task I_can_transform_result_async_with_then_and_it_returns_failure_for_failure_and_mapping_returning_success_ValueTask()
+	{
+		var start = Prelude.Failure<int>("error");
+		var result = await start.ThenAsync(value => ValueTask.FromResult(Prelude.Success(value.ToString(CultureInfo.InvariantCulture))));
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		await Assert.That(result.Error?.Message).IsEqualTo("error");
+	}
+
+	[Test]
+	public async Task I_can_transform_result_async_with_then_and_it_returns_failure_for_failure_and_mapping_returning_failure_ValueTask()
+	{
+		var start = Prelude.Failure<int>("error");
+		var result = await start.ThenAsync(_ => ValueTask.FromResult(Prelude.Failure<int>("error 2")));
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		await Assert.That(result.Error?.Message).IsEqualTo("error");
+	}
+
+	[Test]
+	public async Task I_can_try_map_async_and_it_returns_success_for_success_without_throwing_ValueTask()
+	{
+		var start = Prelude.Success(2);
+		var result = await start.TryMapAsync(value => ValueTask.FromResult(value.ToString(CultureInfo.InvariantCulture)));
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsTrue();
+		await Assert.That(result.Value).IsEqualTo("2");
+	}
+
+	[Test]
+	public async Task I_can_try_map_async_and_it_returns_failure_for_failure_without_throwing_ValueTask()
+	{
+		var start = Prelude.Failure<int>("error");
+		var result = await start.TryMapAsync(value => ValueTask.FromResult(value.ToString(CultureInfo.InvariantCulture)));
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		await Assert.That(result.Error?.Message).IsEqualTo("error");
+	}
+
+	[Test]
+	public async Task I_can_try_map_async_and_it_returns_failure_for_success_with_throwing_ValueTask()
+	{
+		var start = Prelude.Success(2);
+		var result = await start.TryMapAsync(ValueTask<string> (_) => throw new CustomTestException());
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		var instance = await Assert.That(result.Error).IsTypeOf<ExceptionError>();
+		await Assert.That(instance?.Exception).IsTypeOf<CustomTestException>();
+	}
+
+	[Test]
+	public async Task I_can_try_map_async_and_it_returns_failure_for_success_with_await_throwing_ValueTask()
+	{
+		var start = Prelude.Success(2);
+		var result = await start.TryMapAsync(async ValueTask<string> (_) =>
+		{
+			await ValueTask.CompletedTask;
+			throw new CustomTestException();
+		});
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		var instance = await Assert.That(result.Error).IsTypeOf<ExceptionError>();
+		await Assert.That(instance?.Exception).IsTypeOf<CustomTestException>();
+	}
+
+	[Test]
+	public async Task I_can_try_map_async_and_it_returns_failure_for_failure_with_throwing_ValueTask()
+	{
+		var start = Prelude.Failure<int>("error");
+		var result = await start.TryMapAsync(ValueTask<string> (_) => throw new CustomTestException());
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		await Assert.That(result.Error).IsTypeOf<StringError>();
+		await Assert.That(result.Error?.Message).IsEqualTo("error");
+	}
+
+	[Test]
+	public async Task I_can_try_map_async_and_it_returns_failure_for_failure_with_await_throwing_ValueTask()
+	{
+		var start = Prelude.Failure<int>("error");
+		var result = await start.TryMapAsync(async ValueTask<string> (_) =>
+		{
+			await ValueTask.CompletedTask;
+			throw new CustomTestException();
+		});
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		await Assert.That(result.Error).IsTypeOf<StringError>();
+		await Assert.That(result.Error?.Message).IsEqualTo("error");
+	}
+
+	[Test]
+	public async Task I_can_try_transform_result_async_with_then_and_it_returns_success_for_success_and_mapping_returning_success_ValueTask()
+	{
+		var start = Prelude.Success(2);
+		var result = await start.ThenTryAsync(value => ValueTask.FromResult(Prelude.Success(value.ToString(CultureInfo.InvariantCulture))));
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsTrue();
+		await Assert.That(result.Value).IsEqualTo("2");
+	}
+
+	[Test]
+	public async Task I_can_try_transform_result_async_with_then_and_it_returns_failure_for_success_and_mapping_returning_failure_ValueTask()
+	{
+		var start = Prelude.Success(2);
+		var result = await start.ThenTryAsync(_ => ValueTask.FromResult(Prelude.Failure<string>("error")));
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		await Assert.That(result.Error?.Message).IsEqualTo("error");
+	}
+
+	[Test]
+	public async Task I_can_try_transform_result_async_with_then_and_it_returns_failure_for_failure_and_mapping_returning_failure_ValueTask()
+	{
+		var start = Prelude.Failure<int>("error");
+		var result = await start.ThenTryAsync(x => ValueTask.FromResult(Prelude.Success(x.ToString(CultureInfo.InvariantCulture))));
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		await Assert.That(result.Error?.Message).IsEqualTo("error");
+	}
+
+	[Test]
+	public async Task I_can_try_transform_result_async_with_then_and_it_returns_failure_for_success_and_mapping_throwing_ValueTask()
+	{
+		var start = Prelude.Success(2);
+		var result = await start.ThenTryAsync(ValueTask<Result<string>> (_) => throw new CustomTestException());
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		var instance = await Assert.That(result.Error).IsTypeOf<ExceptionError>();
+		await Assert.That(instance?.Exception).IsTypeOf<CustomTestException>();
+	}
+
+	[Test]
+	public async Task I_can_try_transform_result_async_with_then_and_it_returns_failure_for_success_and_mapping_await_throwing_ValueTask()
+	{
+		var start = Prelude.Success(2);
+		var result = await start.ThenTryAsync(async ValueTask<Result<string>> (_) =>
+		{
+			await ValueTask.CompletedTask;
+			throw new CustomTestException();
+		});
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		var instance = await Assert.That(result.Error).IsTypeOf<ExceptionError>();
+		await Assert.That(instance?.Exception).IsTypeOf<CustomTestException>();
+	}
+
+	[Test]
+	public async Task I_can_try_transform_result_async_with_then_and_it_returns_failure_for_failure_and_mapping_throwing_ValueTask()
+	{
+		var start = Prelude.Failure<int>("error");
+		var result = await start.ThenTryAsync(ValueTask<Result<string>> (_) => throw new CustomTestException());
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		await Assert.That(result.Error).IsTypeOf<StringError>();
+		await Assert.That(result.Error?.Message).IsEqualTo("error");
+	}
+
+	[Test]
+	public async Task I_can_try_transform_result_async_with_then_and_it_returns_failure_for_failure_and_mapping_await_throwing_ValueTask()
+	{
+		var start = Prelude.Failure<int>("error");
+		var result = await start.ThenTryAsync(async ValueTask<Result<string>> (_) =>
+		{
+			await ValueTask.CompletedTask;
+			throw new CustomTestException();
+		});
+
+		using var scope = Assert.Multiple();
+		await Assert.That(result.IsSuccess).IsFalse();
+		await Assert.That(result.Error).IsTypeOf<StringError>();
+		await Assert.That(result.Error?.Message).IsEqualTo("error");
+	}
+}

src/request.result.tests/ResultUnboxTests.cs

@@ -0,0 +1,99 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Result.Tests;
+
+internal sealed class ResultUnboxTests
+{
+	[Test]
+	public async Task I_can_try_get_value_and_it_returns_true_and_sets_value_for_success_with_1_param()
+	{
+		var result = Prelude.Success(2);
+		var ok = result.TryGetValue(out int value);
+
+		using var scope = Assert.Multiple();
+		await Assert.That(ok).IsTrue();
+		await Assert.That(value).IsEqualTo(2);
+	}
+
+	[Test]
+	public async Task I_can_try_get_value_and_it_returns_false_for_failure_with_1_param()
+	{
+		var result = Prelude.Failure<int>("error");
+		var ok = result.TryGetValue(out int value);
+
+		using var scope = Assert.Multiple();
+		await Assert.That(ok).IsFalse();
+		await Assert.That(value).IsEqualTo(default(int));
+	}
+
+	[Test]
+	public async Task I_can_try_get_value_and_it_returns_true_and_sets_value_for_success_with_2_param()
+	{
+		var result = Prelude.Success(2);
+		var ok = result.TryGetValue(out int value, out var error);
+
+		using var scope = Assert.Multiple();
+		await Assert.That(ok).IsTrue();
+		await Assert.That(value).IsEqualTo(2);
+		await Assert.That(error).IsEqualTo(default(Error));
+	}
+
+	[Test]
+	public async Task I_can_try_get_value_and_it_returns_false_and_sets_error_for_failure_with_2_param()
+	{
+		var result = Prelude.Failure<int>("error");
+		var ok = result.TryGetValue(out int value, out var error);
+
+		using var scope = Assert.Multiple();
+		await Assert.That(ok).IsFalse();
+		await Assert.That(value).IsEqualTo(default(int));
+		await Assert.That(error?.Message).IsEqualTo("error");
+	}
+
+	[Test]
+	public async Task I_can_try_get_error_and_it_returns_true_and_sets_error_for_failure_with_1_param()
+	{
+		var result = Prelude.Failure<int>("error");
+		var ok = result.TryGetValue(out Error? error);
+
+		using var scope = Assert.Multiple();
+		await Assert.That(ok).IsTrue();
+		await Assert.That(error?.Message).IsEqualTo("error");
+	}
+
+	[Test]
+	public async Task I_can_try_get_error_and_it_returns_false_for_success_with_1_param()
+	{
+		var result = Prelude.Success(2);
+		var ok = result.TryGetValue(out Error? error);
+
+		using var scope = Assert.Multiple();
+		await Assert.That(ok).IsFalse();
+		await Assert.That(error).IsEqualTo(default(Error));
+	}
+
+	[Test]
+	public async Task I_can_try_get_error_and_it_returns_true_and_sets_error_for_failure_with_2_param()
+	{
+		var result = Prelude.Failure<int>("error");
+		var ok = result.TryGetValue(out Error? error, out var value);
+
+		using var scope = Assert.Multiple();
+		await Assert.That(ok).IsTrue();
+		await Assert.That(error?.Message).IsEqualTo("error");
+		await Assert.That(value).IsEqualTo(default(int));
+	}
+
+	[Test]
+	public async Task I_can_try_get_error_and_it_returns_false_and_sets_value_for_success_with_2_param()
+	{
+		var result = Prelude.Success(2);
+		var ok = result.TryGetValue(out Error? error, out var value);
+
+		using var scope = Assert.Multiple();
+		await Assert.That(ok).IsFalse();
+		await Assert.That(error).IsEqualTo(default(Error));
+		await Assert.That(value).IsEqualTo(2);
+	}
+}

src/request.result.tests/_fixtures/CustomTestError.cs

@@ -0,0 +1,11 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Result.Tests;
+
+internal sealed class CustomTestError : Error
+{
+	internal const string DefaultMessage = "This is a custom error for test";
+
+	public override string Message => DefaultMessage;
+}

src/request.result.tests/_fixtures/CustomTestException.cs

@@ -0,0 +1,8 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Result.Tests;
+
+internal sealed class CustomTestException : Exception
+{
+}

src/request.result/Geekeey.Request.Result.csproj

@@ -0,0 +1,30 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Library</OutputType>
+    <TargetFramework>net10.0</TargetFramework>
+    <IsPackable>true</IsPackable>
+  </PropertyGroup>
+
+  <PropertyGroup>
+    <GenerateDocumentationFile>true</GenerateDocumentationFile>
+  </PropertyGroup>
+
+  <ItemGroup Condition="'$(Configuration)' == 'Debug'">
+    <InternalsVisibleTo Include="Geekeey.Request.Result.Tests" />
+  </ItemGroup>
+
+  <PropertyGroup>
+    <PackageReadmeFile>package-readme.md</PackageReadmeFile>
+    <PackageIcon>package-icon.png</PackageIcon>
+    <PackageProjectUrl>https://code.geekeey.de/geekeey/request/src/branch/main/src/request.result</PackageProjectUrl>
+    <PackageLicenseExpression>EUPL-1.2</PackageLicenseExpression>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <None Include=".\package-icon.png" Pack="true" PackagePath="\" Visible="false" />
+    <None Include=".\package-readme.md" Pack="true" PackagePath="\" Visible="false" />
+    <None Include="..\..\LICENSE.md" Pack="true" PackagePath="\" Visible="false" />
+  </ItemGroup>
+
+</Project>

src/request.result/Prelude.cs

@@ -0,0 +1,101 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+using System.Diagnostics.Contracts;
+
+namespace Geekeey.Request.Result;
+
+/// <summary>
+/// A class containing various utility methods, a 'prelude' to the rest of the library.
+/// </summary>
+/// <remarks>
+/// This class is meant to be imported statically, e.g. <c>using static Geekeey.Extensions.Result.Prelude;</c>.
+/// Recommended to be imported globally via a global using statement.
+/// </remarks>
+public static class Prelude
+{
+	/// <summary>
+	/// Creates a result containing a success value.
+	/// </summary>
+	/// <typeparam name="T">The type of the success value.</typeparam>
+	/// <param name="value">The success value to create the result from.</param>
+	[Pure]
+	public static Result<T> Success<T>(T value)
+	{
+		return new Result<T>(value);
+	}
+
+	/// <summary>
+	/// Creates a result containing a failure value.
+	/// </summary>
+	/// <typeparam name="T">The type of success value in the result.</typeparam>
+	/// <param name="error">The failure value to create the result from.</param>
+	[Pure]
+	public static Result<T> Failure<T>(Error error)
+	{
+		return new Result<T>(error);
+	}
+
+	/// <summary>
+	/// Tries to execute a function and return the result. If the function throws an exception, the exception will be
+	/// returned wrapped in an <see cref="ExceptionError"/>.
+	/// </summary>
+	/// <typeparam name="T">The type the function returns.</typeparam>
+	/// <param name="function">The function to try to execute.</param>
+	/// <returns>A result containing the return value of the function or an <see cref="ExceptionError"/> containing the
+	/// exception thrown by the function.</returns>
+	[Pure]
+	public static Result<T> Try<T>(Func<T> function)
+	{
+		try
+		{
+			return new Result<T>(function());
+		}
+		catch (Exception exception)
+		{
+			return new Result<T>(new ExceptionError(exception));
+		}
+	}
+
+	/// <summary>
+	/// Tries to execute an asynchronous function and return the result. If the function throws an exception, the
+	/// exception will be returned wrapped in an <see cref="ExceptionError"/>.
+	/// </summary>
+	/// <typeparam name="T">The type the function returns.</typeparam>
+	/// <param name="function">The function to try to execute.</param>
+	/// <returns>A result containing the return value of the function or an <see cref="ExceptionError"/> containing the
+	/// exception thrown by the function.</returns>
+	[Pure]
+	public static async ValueTask<Result<T>> TryAsync<T>(Func<ValueTask<T>> function)
+	{
+		try
+		{
+			return new Result<T>(await function());
+		}
+		catch (Exception exception)
+		{
+			return new Result<T>(new ExceptionError(exception));
+		}
+	}
+
+	/// <summary>
+	/// Tries to execute an asynchronous function and return the result. If the function throws an exception, the
+	/// exception will be returned wrapped in an <see cref="ExceptionError"/>.
+	/// </summary>
+	/// <typeparam name="T">The type the function returns.</typeparam>
+	/// <param name="function">The function to try to execute.</param>
+	/// <returns>A result containing the return value of the function or an <see cref="ExceptionError"/> containing the
+	/// exception thrown by the function.</returns>
+	[Pure]
+	public static async Task<Result<T>> TryAsync<T>(Func<Task<T>> function)
+	{
+		try
+		{
+			return new Result<T>(await function());
+		}
+		catch (Exception exception)
+		{
+			return new Result<T>(new ExceptionError(exception));
+		}
+	}
+}

src/request.result/Result.Conversion.cs

@@ -0,0 +1,51 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+using System.Diagnostics.Contracts;
+
+namespace Geekeey.Request.Result;
+
+public readonly partial struct Result<T>
+{
+	/// <summary>
+	/// Implicitly constructs a result from a success value.
+	/// </summary>
+	/// <param name="value">The value to construct the result from.</param>
+	[Pure]
+	public static implicit operator Result<T>(T value)
+	{
+		return new Result<T>(value);
+	}
+
+	/// <summary>
+	/// Implicitly constructs a result from a failure value.
+	/// </summary>
+	/// <param name="error">The error to construct the result from.</param>
+	[Pure]
+	public static implicit operator Result<T>(Error error)
+	{
+		return new Result<T>(error);
+	}
+
+	/// <summary>
+	/// Unwraps the success value of the result. Throws an <see cref="UnwrapException"/> if the result is a failure.
+	/// </summary>
+	/// <remarks>
+	/// This call is <b>unsafe</b> in the sense that it might intentionally throw an exception. Please only use this
+	/// call if the caller knows that this operation is safe, or that an exception is acceptable to be thrown.
+	/// </remarks>
+	/// <returns>The success value of the result.</returns>
+	/// <exception cref="UnwrapException">The result is not a success.</exception>
+	[Pure]
+	public T Unwrap()
+	{
+		return IsSuccess ? Value : throw new UnwrapException();
+	}
+
+	/// <inheritdoc cref="Unwrap"/>
+	[Pure]
+	public static explicit operator T(Result<T> result)
+	{
+		return result.Unwrap();
+	}
+}

src/request.result/Result.Equality.cs

@@ -0,0 +1,163 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+using System.Diagnostics.CodeAnalysis;
+using System.Diagnostics.Contracts;
+using System.Numerics;
+
+namespace Geekeey.Request.Result;
+
+public readonly partial struct Result<T> : IEquatable<Result<T>>, IEquatable<T>
+{
+	/// <summary>
+	/// Checks whether the result is equal to another result. Results are equal if both results are success values and
+	/// the success values are equal, or if both results are failures.
+	/// </summary>
+	/// <param name="other">The result to check for equality with the current result.</param>
+	[Pure]
+	public bool Equals(Result<T> other)
+	{
+		return Equals(this, other, EqualityComparer<T>.Default);
+	}
+
+	/// <summary>
+	/// Checks whether the result is equal to another result. Results are equal if both results are success values and
+	/// the success values are equal, or if both results are failures.
+	/// </summary>
+	/// <param name="other">The result to check for equality with the current result.</param>
+	/// <param name="comparer">The equality comparer to use for comparing values.</param>
+	[Pure]
+	public bool Equals(Result<T> other, IEqualityComparer<T> comparer)
+	{
+		return Equals(this, other, comparer);
+	}
+
+	/// <summary>
+	/// Checks whether the result is a success value and the success value is equal to another value.
+	/// </summary>
+	/// <param name="other">The value to check for equality with the success value of the result.</param>
+	[Pure]
+	public bool Equals(T? other)
+	{
+		return Equals(this, other, EqualityComparer<T>.Default);
+	}
+
+	/// <summary>
+	/// Checks whether the result is a success value and the success value is equal to another value using a specified
+	/// equality comparer.
+	/// </summary>
+	/// <param name="other">The value to check for equality with the success value of the result.</param>
+	/// <param name="comparer">The equality comparer to use for comparing values.</param>
+	[Pure]
+	public bool Equals(T? other, IEqualityComparer<T> comparer)
+	{
+		return Equals(this, other, comparer);
+	}
+
+	/// <inheritdoc/>
+	[Pure]
+	public override bool Equals(object? obj)
+	{
+		return (obj is T x && Equals(x)) || (obj is Result<T> r && Equals(r));
+	}
+
+	/// <inheritdoc/>
+	[Pure]
+	public override int GetHashCode()
+	{
+		return GetHashCode(this, EqualityComparer<T>.Default);
+	}
+
+	internal static bool Equals(Result<T> a, Result<T> b, IEqualityComparer<T> comparer)
+	{
+		if (!a.IsSuccess || !b.IsSuccess)
+		{
+			return !a.IsSuccess && !b.IsSuccess;
+		}
+
+		if (a.Value is null || b.Value is null)
+		{
+			return a.Value is null && b.Value is null;
+		}
+
+		return comparer.Equals(a.Value, b.Value);
+	}
+
+	internal static bool Equals(Result<T> a, T? b, IEqualityComparer<T> comparer)
+	{
+		if (!a.IsSuccess)
+		{
+			return false;
+		}
+
+		if (a.Value is null || b is null)
+		{
+			return a.Value is null && b is null;
+		}
+
+		return comparer.Equals(a.Value, b);
+	}
+
+	internal static int GetHashCode(Result<T> result, IEqualityComparer<T> comparer)
+	{
+		if (result is { IsSuccess: true, Value: not null })
+		{
+			return comparer.GetHashCode(result.Value);
+		}
+
+		return 0;
+	}
+}
+
+public readonly partial struct Result<T> : IEqualityOperators<Result<T>, Result<T>, bool>, IEqualityOperators<Result<T>, T, bool>
+{
+	/// <summary>
+	/// Checks whether two results are equal. Results are equal if both results are success values and the success
+	/// values are equal, or if both results are failures.
+	/// </summary>
+	/// <param name="a">The first result to compare.</param>
+	/// <param name="b">The second result to compare.</param>
+	[Pure]
+	[ExcludeFromCodeCoverage]
+	public static bool operator ==(Result<T> a, Result<T> b)
+	{
+		return Equals(a, b, EqualityComparer<T>.Default);
+	}
+
+	/// <summary>
+	/// Checks whether two results are not equal. Results are equal if both results are success values and the success
+	/// values are equal, or if both results are failures.
+	/// </summary>
+	/// <param name="a">The first result to compare.</param>
+	/// <param name="b">The second result to compare.</param>
+	[Pure]
+	[ExcludeFromCodeCoverage]
+	public static bool operator !=(Result<T> a, Result<T> b)
+	{
+		return !Equals(a, b, EqualityComparer<T>.Default);
+	}
+
+	/// <summary>
+	/// Checks whether a result is a success value and the success value is equal to another value.
+	/// </summary>
+	/// <param name="a">The result to compare.</param>
+	/// <param name="b">The value to check for equality with the success value in the result.</param>
+	[Pure]
+	[ExcludeFromCodeCoverage]
+	public static bool operator ==(Result<T> a, T? b)
+	{
+		return Equals(a, b, EqualityComparer<T>.Default);
+	}
+
+	/// <summary>
+	/// Checks whether a result either does not have a value, or the value is not equal to another value.
+	/// </summary>
+	/// <param name="a">The result to compare.</param>
+	/// <param name="b">The value to check for inequality with the success value in the result.</param>
+	[Pure]
+	[ExcludeFromCodeCoverage]
+	public static bool operator !=(Result<T> a, T? b)
+	{
+		return !Equals(a, b, EqualityComparer<T>.Default);
+	}
+}

src/request.result/Result.Matching.cs

@@ -0,0 +1,104 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+using System.Diagnostics.Contracts;
+
+namespace Geekeey.Request.Result;
+
+public readonly partial struct Result<T>
+{
+	/// <summary>
+	/// Matches over the success value or failure value of the result and returns another value. Can be conceptualized
+	/// as an exhaustive <c>switch</c> expression matching all possible values of the type.
+	/// </summary>
+	/// <typeparam name="TResult">The type to return from the match.</typeparam>
+	/// <param name="success">The function to apply to the success value of the result if the result is a success.</param>
+	/// <param name="failure">The function to apply to the failure value of the result if the result is a failure.</param>
+	/// <returns>The result of applying either <paramref name="success"/> or <paramref name="failure"/> on the success
+	/// value or failure value of the result.</returns>
+	[Pure]
+	public TResult Match<TResult>(Func<T, TResult> success, Func<Error, TResult> failure)
+	{
+		return IsSuccess ? success(Value!) : failure(Error!);
+	}
+
+	/// <summary>
+	/// Matches over the success value or failure value of the result and invokes an effectful action onto the success
+	/// value or failure value. Can be conceptualized as an exhaustive <c>switch</c> statement matching all possible
+	/// values of the type.
+	/// </summary>
+	/// <param name="success">The function to call with the success value of the result if the result is a success.</param>
+	/// <param name="failure">The function to call with the failure value of the result if the result is a failure.</param>
+	public void Switch(Action<T> success, Action<Error> failure)
+	{
+		if (IsSuccess)
+		{
+			success(Value!);
+		}
+		else
+		{
+			failure(Error!);
+		}
+	}
+}
+
+public readonly partial struct Result<T>
+{
+	/// <summary>
+	/// Asynchronously matches over the success value or failure value of the result and returns another value. Can be
+	/// conceptualized as an exhaustive <c>switch</c> expression matching all possible values of the type.
+	/// </summary>
+	/// <typeparam name="TResult">The type to return from the match.</typeparam>
+	/// <param name="success">The function to apply to the success value of the result if the result is a success.</param>
+	/// <param name="failure">The function to apply to the failure value of the result if the result is a failure.</param>
+	/// <returns>A task completing with the result of applying either <paramref name="success"/> or
+	/// <paramref name="failure"/> on the success value or failure value of the result.</returns>
+	[Pure]
+	public async Task<TResult> MatchAsync<TResult>(Func<T, Task<TResult>> success, Func<Error, Task<TResult>> failure)
+	{
+		return IsSuccess ? await success(Value!) : await failure(Error!);
+	}
+
+	/// <summary>
+	/// Asynchronously matches over the success value or failure value of the result and invokes an effectful action
+	/// onto the success value or failure value. Can be conceptualized as an exhaustive <c>switch</c> statement matching
+	/// all possible values of
+	/// the type.
+	/// </summary>
+	/// <param name="success">The function to call with the success value of the result if the result is a success.</param>
+	/// <param name="failure">The function to call with the failure value of the result if the result is a failure.</param>
+	public Task SwitchAsync(Func<T, Task> success, Func<Error, Task> failure)
+	{
+		return IsSuccess ? success(Value!) : failure(Error!);
+	}
+}
+
+public readonly partial struct Result<T>
+{
+	/// <summary>
+	/// Asynchronously matches over the success value or failure value of the result and returns another value. Can be
+	/// conceptualized as an exhaustive <c>switch</c> expression matching all possible values of the type.
+	/// </summary>
+	/// <typeparam name="TResult">The type to return from the match.</typeparam>
+	/// <param name="success">The function to apply to the success value of the result if the result is a success.</param>
+	/// <param name="failure">The function to apply to the failure value of the result if the result is a failure.</param>
+	/// <returns>A task completing with the result of applying either <paramref name="success"/> or
+	/// <paramref name="failure"/> on the success value or failure value of the result.</returns>
+	[Pure]
+	public ValueTask<TResult> MatchAsync<TResult>(Func<T, ValueTask<TResult>> success, Func<Error, ValueTask<TResult>> failure)
+	{
+		return IsSuccess ? success(Value!) : failure(Error!);
+	}
+
+	/// <summary>
+	/// Asynchronously matches over the success value or failure value of the result and invokes an effectful action
+	/// onto the success value or the failure value. Can be conceptualized as an exhaustive <c>switch</c> statement
+	/// matching all possible values of the type.
+	/// </summary>
+	/// <param name="success">The function to call with the success value of the result if the result is a success.</param>
+	/// <param name="failure">The function to call with the failure value of the result if the result is a failure.</param>
+	public ValueTask SwitchAsync(Func<T, ValueTask> success, Func<Error, ValueTask> failure)
+	{
+		return IsSuccess ? success(Value!) : failure(Error!);
+	}
+}

src/request.result/Result.Transform.cs

@@ -0,0 +1,366 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+using System.Diagnostics.Contracts;
+
+namespace Geekeey.Request.Result;
+
+public readonly partial struct Result<T>
+{
+	/// <summary>
+	/// Maps the success value of the result using a mapping function, or does nothing if the result is a failure.
+	/// </summary>
+	/// <param name="func">The function used to map the success value.</param>
+	/// <typeparam name="TNew">The type of the new value.</typeparam>
+	/// <returns>A new result containing either the mapped success value or the failure value of the original
+	/// result.</returns>
+	[Pure]
+	public Result<TNew> Map<TNew>(Func<T, TNew> func)
+	{
+		return IsSuccess ? new Result<TNew>(func(Value!)) : new Result<TNew>(Error!);
+	}
+
+	/// <summary>
+	/// Tries to map the success value of the result using a mapping function, or does nothing if the result is a
+	/// failure. If the mapping function throws an exception, the exception will be returned wrapped in an
+	/// <see cref="ExceptionError"/>.
+	/// </summary>
+	/// <param name="func">The function used to map the success value.</param>
+	/// <typeparam name="TNew">The type of the new value.</typeparam>
+	/// <returns>A new result containing either the mapped value, the exception thrown by <paramref name="func"/>
+	/// wrapped in an <see cref="ExceptionError"/>, or the failure value of the original result.</returns>
+	[Pure]
+	public Result<TNew> TryMap<TNew>(Func<T, TNew> func)
+	{
+		try
+		{
+			return Map(func);
+		}
+		catch (Exception exception)
+		{
+			return new Result<TNew>(new ExceptionError(exception));
+		}
+	}
+
+	/// <summary>
+	/// Maps the success value of the result to a new result using a mapping function, or does nothing if the result is
+	/// a failure.
+	/// </summary>
+	/// <param name="func">The function used to map the success value to a new result.</param>
+	/// <typeparam name="TNew">The type of the new value.</typeparam>
+	/// <returns>A result which is either the mapped result or a new result containing the failure value of the original
+	/// result.</returns>
+	[Pure]
+	public Result<TNew> Then<TNew>(Func<T, Result<TNew>> func)
+	{
+		return IsSuccess ? func(Value!) : new Result<TNew>(Error!);
+	}
+
+	/// <summary>
+	/// Tries to map the success value of the result to a new result using a mapping function, or does nothing if the result
+	/// is a failure. If the mapping function throws an exception, the exception will be returned wrapped in an
+	/// <see cref="ExceptionError"/>.
+	/// </summary>
+	/// <param name="func">The function used to map the success value to a new result.</param>
+	/// <typeparam name="TNew">The type of the new value.</typeparam>
+	/// <returns>A result which is either the mapped result, the exception thrown by <paramref name="func"/> wrapped in
+	/// an <see cref="ExceptionError"/>, or a new result containing the failure value of the original result.</returns>
+	[Pure]
+	public Result<TNew> ThenTry<TNew>(Func<T, Result<TNew>> func)
+	{
+		try
+		{
+			return Then(func);
+		}
+		catch (Exception exception)
+		{
+			return new Result<TNew>(new ExceptionError(exception));
+		}
+	}
+}
+
+public readonly partial struct Result<T>
+{
+	/// <summary>
+	/// Maps the success value of the result using an asynchronous mapping function, or does nothing if the result is
+	/// a failure.
+	/// </summary>
+	/// <param name="func">The function used to map the success value.</param>
+	/// <typeparam name="TNew">The type of the new value.</typeparam>
+	/// <returns>A <see cref="Task{T}"/> which either completes asynchronously by invoking the mapping function on
+	/// the success value of the result and constructing a new result containing the mapped value, or completes
+	/// synchronously by returning a new result containing the failure value of the original result.</returns>
+	[Pure]
+	public Task<Result<TNew>> MapAsync<TNew>(Func<T, Task<TNew>> func)
+	{
+		if (!IsSuccess)
+		{
+			return Task.FromResult(new Result<TNew>(Error!));
+		}
+
+		var task = func(Value!);
+		return CreateResult(task);
+
+		static async Task<Result<TNew>> CreateResult(Task<TNew> task)
+		{
+			var value = await task;
+			return new Result<TNew>(value);
+		}
+	}
+
+	/// <summary>
+	/// Maps the success value of the result using an asynchronous mapping function, or does nothing if the result is a
+	/// failure. If the mapping function throws an exception, the exception will be returned wrapped in an
+	/// <see cref="ExceptionError"/>.
+	/// </summary>
+	/// <param name="func">The function used to map the success value.</param>
+	/// <typeparam name="TNew">The type of the new value.</typeparam>
+	/// <returns>A <see cref="Task{T}"/> which either completes asynchronously by invoking the mapping function on
+	/// the success value of the result and constructing a new result containing the mapped value, returning any exception
+	/// thrown by <paramref name="func"/> wrapped in an <see cref="ExceptionError"/> or completes synchronously by
+	/// returning a new result containing the failure value of the original result.</returns>
+	[Pure]
+	public Task<Result<TNew>> TryMapAsync<TNew>(Func<T, Task<TNew>> func)
+	{
+		if (!IsSuccess)
+		{
+			return Task.FromResult(new Result<TNew>(Error!));
+		}
+
+		try
+		{
+			var task = func(Value!);
+			return CreateResult(task);
+		}
+		catch (Exception exception)
+		{
+			return Task.FromResult(new Result<TNew>(new ExceptionError(exception)));
+		}
+
+		static async Task<Result<TNew>> CreateResult(Task<TNew> task)
+		{
+			try
+			{
+				var value = await task;
+				return new Result<TNew>(value);
+			}
+			catch (Exception exception)
+			{
+				return new Result<TNew>(new ExceptionError(exception));
+			}
+		}
+	}
+
+	/// <summary>
+	/// Maps the success value of the result to a new result using an asynchronous mapping function, or does nothing if
+	/// the result is a failure.
+	/// </summary>
+	/// <param name="func">The function used to map the success value to a new result.</param>
+	/// <typeparam name="TNew">The type of the new value.</typeparam>
+	/// <returns>A <see cref="Task{T}"/> which either completes asynchronously by invoking the mapping function on
+	/// the success value of the result, or completes synchronously by returning a new result containing the failure
+	/// value of the original result.</returns>
+	[Pure]
+	public Task<Result<TNew>> ThenAsync<TNew>(Func<T, Task<Result<TNew>>> func)
+	{
+		if (!IsSuccess)
+		{
+			return Task.FromResult(new Result<TNew>(Error!));
+		}
+
+		var task = func(Value!);
+		return CreateResult(task);
+
+		static async Task<Result<TNew>> CreateResult(Task<Result<TNew>> task)
+		{
+			var result = await task;
+			return result;
+		}
+	}
+
+	/// <summary>
+	/// Maps the success value of the result to a new result using an asynchronous mapping function, or does nothing if
+	/// the result is a failure. If the mapping function throws an exception, the exception will be returned wrapped in
+	/// an <see cref="ExceptionError"/>.
+	/// </summary>
+	/// <param name="func">The function used to map the success value to a new result.</param>
+	/// <typeparam name="TNew">The type of the new value.</typeparam>
+	/// <returns>A <see cref="Task{T}"/> which either completes asynchronously by invoking the mapping function on
+	/// the success value of the result, returning any exception thrown by <paramref name="func"/> wrapped in an
+	/// <see cref="ExceptionError"/>, or completes synchronously by returning a new result containing the failure value
+	/// of the original result.</returns>
+	[Pure]
+	public Task<Result<TNew>> ThenTryAsync<TNew>(Func<T, Task<Result<TNew>>> func)
+	{
+		if (!IsSuccess)
+		{
+			return Task.FromResult(new Result<TNew>(Error!));
+		}
+
+		try
+		{
+			var task = func(Value!);
+			return CreateResult(task);
+		}
+		catch (Exception exception)
+		{
+			return Task.FromResult(new Result<TNew>(new ExceptionError(exception)));
+		}
+
+		static async Task<Result<TNew>> CreateResult(Task<Result<TNew>> task)
+		{
+			try
+			{
+				var value = await task;
+				return value;
+			}
+			catch (Exception exception)
+			{
+				return new Result<TNew>(new ExceptionError(exception));
+			}
+		}
+	}
+}
+
+public readonly partial struct Result<T>
+{
+	/// <summary>
+	/// Maps the success value of the result using an asynchronous mapping function, or does nothing if the result is
+	/// a failure.
+	/// </summary>
+	/// <param name="func">The function used to map the success value.</param>
+	/// <typeparam name="TNew">The type of the new value.</typeparam>
+	/// <returns>A <see cref="ValueTask{T}"/> which either completes asynchronously by invoking the mapping function on
+	/// the success value of the result and constructing a new result containing the mapped value, or completes
+	/// synchronously by returning a new result containing the failure value of the original result.</returns>
+	[Pure]
+	public ValueTask<Result<TNew>> MapAsync<TNew>(Func<T, ValueTask<TNew>> func)
+	{
+		if (!IsSuccess)
+		{
+			return ValueTask.FromResult(new Result<TNew>(Error!));
+		}
+
+		var task = func(Value!);
+		return CreateResult(task);
+
+		static async ValueTask<Result<TNew>> CreateResult(ValueTask<TNew> task)
+		{
+			var value = await task;
+			return new Result<TNew>(value);
+		}
+	}
+
+	/// <summary>
+	/// Maps the success value of the result using an asynchronous mapping function, or does nothing if the result is a
+	/// failure. If the mapping function throws an exception, the exception will be returned wrapped in an
+	/// <see cref="ExceptionError"/>.
+	/// </summary>
+	/// <param name="func">The function used to map the success value.</param>
+	/// <typeparam name="TNew">The type of the new value.</typeparam>
+	/// <returns>A <see cref="ValueTask{T}"/> which either completes asynchronously by invoking the mapping function on
+	/// the success value of the result and constructing a new result containing the mapped value, returning any exception
+	/// thrown by <paramref name="func"/> wrapped in an <see cref="ExceptionError"/> or completes synchronously by
+	/// returning a new result containing the failure value of the original result.</returns>
+	[Pure]
+	public ValueTask<Result<TNew>> TryMapAsync<TNew>(Func<T, ValueTask<TNew>> func)
+	{
+		if (!IsSuccess)
+		{
+			return ValueTask.FromResult(new Result<TNew>(Error!));
+		}
+
+		try
+		{
+			var task = func(Value!);
+			return CreateResult(task);
+		}
+		catch (Exception exception)
+		{
+			return ValueTask.FromResult(new Result<TNew>(new ExceptionError(exception)));
+		}
+
+		static async ValueTask<Result<TNew>> CreateResult(ValueTask<TNew> task)
+		{
+			try
+			{
+				var value = await task;
+				return new Result<TNew>(value);
+			}
+			catch (Exception exception)
+			{
+				return new Result<TNew>(new ExceptionError(exception));
+			}
+		}
+	}
+
+	/// <summary>
+	/// Maps the success value of the result to a new result using an asynchronous mapping function, or does nothing if
+	/// the result is a failure.
+	/// </summary>
+	/// <param name="func">The function used to map the success value to a new result.</param>
+	/// <typeparam name="TNew">The type of the new value.</typeparam>
+	/// <returns>A <see cref="ValueTask{T}"/> which either completes asynchronously by invoking the mapping function on
+	/// the success value of the result, or completes synchronously by returning a new result containing the failure
+	/// value of the original result.</returns>
+	[Pure]
+	public ValueTask<Result<TNew>> ThenAsync<TNew>(Func<T, ValueTask<Result<TNew>>> func)
+	{
+		if (!IsSuccess)
+		{
+			return ValueTask.FromResult(new Result<TNew>(Error!));
+		}
+
+		var task = func(Value!);
+		return CreateResult(task);
+
+		static async ValueTask<Result<TNew>> CreateResult(ValueTask<Result<TNew>> task)
+		{
+			var result = await task;
+			return result;
+		}
+	}
+
+	/// <summary>
+	/// Maps the success value of the result to a new result using an asynchronous mapping function, or does nothing if
+	/// the result is a failure. If the mapping function throws an exception, the exception will be returned wrapped in
+	/// an <see cref="ExceptionError"/>.
+	/// </summary>
+	/// <param name="func">The function used to map the success value to a new result.</param>
+	/// <typeparam name="TNew">The type of the new value.</typeparam>
+	/// <returns>A <see cref="ValueTask{T}"/> which either completes asynchronously by invoking the mapping function on
+	/// the success value of the result, returning any exception thrown by <paramref name="func"/> wrapped in an
+	/// <see cref="ExceptionError"/>, or completes synchronously by returning a new result containing the failure value
+	/// of the original result.</returns>
+	[Pure]
+	public ValueTask<Result<TNew>> ThenTryAsync<TNew>(Func<T, ValueTask<Result<TNew>>> func)
+	{
+		if (!IsSuccess)
+		{
+			return ValueTask.FromResult(new Result<TNew>(Error!));
+		}
+
+		try
+		{
+			var task = func(Value!);
+			return CreateResult(task);
+		}
+		catch (Exception exception)
+		{
+			return ValueTask.FromResult(new Result<TNew>(new ExceptionError(exception)));
+		}
+
+		static async ValueTask<Result<TNew>> CreateResult(ValueTask<Result<TNew>> task)
+		{
+			try
+			{
+				var value = await task;
+				return value;
+			}
+			catch (Exception exception)
+			{
+				return new Result<TNew>(new ExceptionError(exception));
+			}
+		}
+	}
+}

src/request.result/Result.Unbox.cs

@@ -0,0 +1,66 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+using System.Diagnostics.CodeAnalysis;
+using System.Diagnostics.Contracts;
+
+namespace Geekeey.Request.Result;
+
+public readonly partial struct Result<T>
+{
+	/// <summary>
+	/// Tries to get the success value from the result.
+	/// </summary>
+	/// <param name="value">The success value of the result.</param>
+	/// <returns>Whether the result has success value.</returns>
+	[Pure]
+	public bool TryGetValue([MaybeNullWhen(false)] out T value)
+	{
+		value = Value;
+
+		return IsSuccess;
+	}
+
+	/// <summary>
+	/// Tries to get the success value from the result.
+	/// </summary>
+	/// <param name="value">The success value of the result.</param>
+	/// <param name="error">The failure value of the result.</param>
+	/// <returns>Whether the result has a success value.</returns>
+	[Pure]
+	public bool TryGetValue([MaybeNullWhen(false)] out T value, [MaybeNullWhen(true)] out Error error)
+	{
+		value = Value;
+		error = !IsSuccess ? Error : null;
+
+		return IsSuccess;
+	}
+
+	/// <summary>
+	/// Tries to get the failure value from the result.
+	/// </summary>
+	/// <param name="error">The failure value of the result.</param>
+	/// <returns>Whether the result has a failure value.</returns>
+	[Pure]
+	public bool TryGetValue([MaybeNullWhen(false)] out Error error)
+	{
+		error = !IsSuccess ? Error : null;
+
+		return !IsSuccess;
+	}
+
+	/// <summary>
+	/// Tries to get the failure value from the result.
+	/// </summary>
+	/// <param name="error">The failure value of the result.</param>
+	/// <param name="value">The success value of the result.</param>
+	/// <returns>Whether the result a failure value.</returns>
+	[Pure]
+	public bool TryGetValue([MaybeNullWhen(false)] out Error error, [MaybeNullWhen(true)] out T value)
+	{
+		error = !IsSuccess ? Error : null;
+		value = Value;
+
+		return !IsSuccess;
+	}
+}

src/request.result/Result.cs

@@ -0,0 +1,76 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+using System.Diagnostics;
+using System.Diagnostics.CodeAnalysis;
+using System.Diagnostics.Contracts;
+
+namespace Geekeey.Request.Result;
+
+/// <summary>
+/// A type which contains either a success value or a failure value, which is represented by an <see cref="Error"/>.
+/// </summary>
+/// <typeparam name="T">The type of the success value.</typeparam>
+[DebuggerTypeProxy(typeof(Result<>.ResultDebugProxy))]
+public readonly partial struct Result<T>
+{
+	/// <summary>
+	/// Creates a new result with a success value.
+	/// </summary>
+	/// <param name="value">The success value.</param>
+	public Result(T value)
+	{
+		IsSuccess = true;
+		Value = value;
+		Error = default;
+	}
+
+	/// <summary>
+	/// Creates a new result with a failure value.
+	/// </summary>
+	/// <param name="error">The error of the result.</param>
+	public Result(Error error)
+	{
+		IsSuccess = false;
+		Value = default;
+		Error = error;
+	}
+
+	internal T? Value { get; }
+
+	internal Error? Error => IsSuccess ? null : (field ?? Error.DefaultValueError);
+
+	/// <summary>
+	/// Whether the result is a success.
+	/// </summary>
+	/// <remarks>
+	/// This is always the inverse of <see cref="IsFailure"/> but is more specific about intent.
+	/// </remarks>
+	[MemberNotNullWhen(true, nameof(Value))]
+	public bool IsSuccess { get; }
+
+	/// <summary>
+	/// Whether the result is a failure.
+	/// </summary>
+	/// <remarks>
+	/// This is always the inverse of <see cref="IsSuccess"/> but is more specific about intent.
+	/// </remarks>
+	[MemberNotNullWhen(true, nameof(Error))]
+	public bool IsFailure => !IsSuccess;
+
+	/// <summary>
+	/// Gets a string representation of the result.
+	/// </summary>
+	[Pure]
+	public override string ToString()
+	{
+		return IsSuccess ? $"Success {{ {Value} }}" : $"Failure {{ {Error} }}";
+	}
+
+	private sealed class ResultDebugProxy(Result<T> result)
+	{
+		public bool IsSuccess => result.IsSuccess;
+
+		public object? Value => result.IsSuccess ? result.Value : result.Error;
+	}
+}

src/request.result/_errors/AggregateError.cs

@@ -0,0 +1,27 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Result;
+
+/// <summary>
+/// An error which is a combination of other errors.
+/// </summary>
+public sealed class AggregateError : Error
+{
+	/// <summary>
+	/// An error which is a combination of other errors.
+	/// </summary>
+	/// <param name="errors">The errors the error consists of.</param>
+	public AggregateError(IEnumerable<Error> errors)
+	{
+		Errors = [.. errors];
+	}
+
+	/// <summary>
+	/// The errors the error consists of.
+	/// </summary>
+	public IReadOnlyCollection<Error> Errors { get; }
+
+	/// <inheritdoc/>
+	public override string Message => string.Join(Environment.NewLine, Errors.Select(error => error.Message));
+}

src/request.result/_errors/Error.cs

@@ -0,0 +1,54 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Result;
+
+/// <summary>
+/// An error containing a simple message. Makes up the other half of a <see cref="Result{T}"/> which might be an error.
+/// </summary>
+/// <remarks>
+/// An error is conceptually very similar to an exception but without the ability to be thrown, meant to be a more
+/// lightweight type meant to be wrapped in a <see cref="Result{T}"/>.
+/// An error fundamentally only contains a single string message, however other more concrete types such as
+/// <see cref="ExceptionError"/> or <see cref="AggregateError"/> may define other properties.
+/// Errors are meant to be small, specific, and descriptive, such that they are easy to match over and provide specific
+/// handling for specific kinds of errors.
+/// </remarks>
+public abstract class Error
+{
+	/// <summary>
+	/// A statically accessible default "Result has no value." error.
+	/// </summary>
+	internal static Error DefaultValueError { get; } = new StringError("The result has no value.");
+
+	/// <summary>
+	/// The message used to display the error.
+	/// </summary>
+	public abstract string Message { get; }
+
+	/// <summary>
+	/// Gets a string representation of the error. Returns <see cref="Message"/> by default.
+	/// </summary>
+	public override string ToString()
+	{
+		return Message;
+	}
+
+	/// <summary>
+	/// Implicitly converts a string into a <see cref="StringError"/>.
+	/// </summary>
+	/// <param name="message">The message of the error.</param>
+	public static implicit operator Error(string message)
+	{
+		return new StringError(message);
+	}
+
+	/// <summary>
+	/// Implicitly converts an exception into an <see cref="ExceptionError"/>.
+	/// </summary>
+	/// <param name="exception">The exception to convert.</param>
+	public static implicit operator Error(Exception exception)
+	{
+		return new ExceptionError(exception);
+	}
+}

src/request.result/_errors/ExceptionError.cs

@@ -0,0 +1,29 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Result;
+
+/// <summary>
+/// An error which is constructed from an exception.
+/// </summary>
+public sealed class ExceptionError : Error
+{
+	/// <summary>
+	/// An error which is constructed from an exception.
+	/// </summary>
+	/// <param name="exception">The exception in the error.</param>
+	public ExceptionError(Exception exception)
+	{
+		Exception = exception;
+	}
+
+	/// <summary>
+	/// The exception in the error.
+	/// </summary>
+	public Exception Exception { get; }
+
+	/// <summary>
+	/// The exception in the error.
+	/// </summary>
+	public override string Message => Exception.Message;
+}

src/request.result/_errors/StringError.cs

@@ -0,0 +1,24 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Result;
+
+/// <summary>
+/// An error which displays a simple string.
+/// </summary>
+public sealed class StringError : Error
+{
+	private readonly string _message;
+
+	/// <summary>
+	/// An error which displays a simple string.
+	/// </summary>
+	/// <param name="message">The message to display.</param>
+	public StringError(string message)
+	{
+		_message = message;
+	}
+
+	/// <inheritdoc/>
+	public override string Message => _message;
+}

src/request.result/_exceptions/UnwrapException.cs

@@ -0,0 +1,26 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Result;
+
+/// <summary>
+/// The exception is thrown when an <see cref="Result{T}"/> is attempted to be unwrapped contains only a failure value.
+/// </summary>
+public sealed class UnwrapException : Exception
+{
+	/// <summary>
+	/// Creates a new <see cref="UnwrapException"/>.
+	/// </summary>
+	public UnwrapException()
+		: base("Cannot unwrap result because it does not have a value.")
+	{
+	}
+
+	/// <summary>
+	/// Creates a new <see cref="UnwrapException"/>.
+	/// </summary>
+	/// <param name="error">An error message.</param>
+	public UnwrapException(string error) : base(error)
+	{
+	}
+}

src/request.result/_extensions/Extensions.Enumerable.cs

@@ -0,0 +1,90 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Result;
+
+/// <summary>
+/// Extensions for or relating to <see cref="Result{T}"/>.
+/// </summary>
+public static partial class Extensions
+{
+	/// <summary>
+	/// Turns a sequence of results into a single result containing the success values in the results only if all the
+	/// results have success values.
+	/// </summary>
+	/// <param name="results">The results to turn into a single sequence.</param>
+	/// <typeparam name="T">The type of the success values in the results.</typeparam>
+	/// <returns>A single result containing a sequence of all the success values from the original sequence of results,
+	/// or the first failure value encountered within the sequence.</returns>
+	/// <remarks>
+	/// This method completely enumerates the input sequence before returning and is not lazy. As a consequence of this,
+	/// the sequence within the returned result is an <see cref="IReadOnlyList{T}"/>.
+	/// </remarks>
+	public static Result<IReadOnlyList<T>> Join<T>(this IEnumerable<Result<T>> results)
+	{
+		_ = results.TryGetNonEnumeratedCount(out var count);
+		var list = new List<T>(count);
+
+		foreach (var result in results)
+		{
+			if (!result.TryGetValue(out T? value, out var error))
+			{
+				return new Result<IReadOnlyList<T>>(error);
+			}
+
+			list.Add(value);
+		}
+
+		return list;
+	}
+
+	/// <inheritdoc cref="Join{T}(IEnumerable{Result{T}})"/>
+	/// <remarks>
+	/// For parallel execution of the async tasks, one should await the <c>Task.WhenAll()</c> of the provided list
+	/// before calling this function
+	/// </remarks>
+	/// <seealso cref="Join{T}(IEnumerable{Result{T}})"/>
+	// ReSharper disable once InconsistentNaming
+	public static async ValueTask<Result<IReadOnlyList<T>>> Join<T>(this IEnumerable<ValueTask<Result<T>>> results)
+	{
+		_ = results.TryGetNonEnumeratedCount(out var count);
+		var list = new List<T>(count);
+
+		foreach (var result in results)
+		{
+			if (!(await result).TryGetValue(out T? value, out var error))
+			{
+				return new Result<IReadOnlyList<T>>(error);
+			}
+
+			list.Add(value);
+		}
+
+		return list;
+	}
+
+	/// <inheritdoc cref="Join{T}(IEnumerable{Result{T}})"/>
+	/// <remarks>
+	/// For parallel execution of the async tasks, one should await the <c>Task.WhenAll()</c> of the provided list
+	/// before calling this function
+	/// </remarks>
+	/// <seealso cref="Join{T}(IEnumerable{Result{T}})"/>
+	// ReSharper disable once InconsistentNaming
+	public static async Task<Result<IReadOnlyList<T>>> Join<T>(this IEnumerable<Task<Result<T>>> results)
+	{
+		_ = results.TryGetNonEnumeratedCount(out var count);
+		var list = new List<T>(count);
+
+		foreach (var result in results)
+		{
+			if (!(await result).TryGetValue(out T? value, out var error))
+			{
+				return new Result<IReadOnlyList<T>>(error);
+			}
+
+			list.Add(value);
+		}
+
+		return list;
+	}
+}

src/request.result/_extensions/Extensions.Task.cs

@@ -0,0 +1,100 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+using System.Diagnostics.CodeAnalysis;
+using System.Runtime.CompilerServices;
+
+namespace Geekeey.Request.Result;
+
+/// <summary>
+/// Extensions for or relating to <see cref="Result{T}"/>.
+/// </summary>
+[ExcludeFromCodeCoverage]
+public static partial class Extensions
+{
+	#region Task<Result<T>>
+
+	/// <summary>
+	/// Maps the success value of the result object of the completed task using a mapping function, or does nothing if
+	/// the result object of the completed task is a failure.
+	/// </summary>
+	/// <param name="result">A task object returning a result object when completing.</param>
+	/// <param name="func">The function used to map the success value.</param>
+	/// <typeparam name="T">The type of the object inside the result returned by the task.</typeparam>
+	/// <typeparam name="TNew">The type of the new value.</typeparam>
+	/// <returns>A new result containing either the mapped success value or the failure value of the original
+	/// result.</returns>
+	[MethodImpl(MethodImplOptions.AggressiveInlining)]
+	// ReSharper disable once InconsistentNaming
+	public static async Task<Result<TNew>> Map<T, TNew>(this Task<Result<T>> result, Func<T, TNew> func)
+	{
+		return (await result).Map(func);
+	}
+
+	/// <inheritdoc cref="Map{T,TNew}(Task{Result{T}},Func{T,TNew})"/>
+	[MethodImpl(MethodImplOptions.AggressiveInlining)]
+	public static async Task<Result<TNew>> MapAsync<T, TNew>(this Task<Result<T>> result, Func<T, ValueTask<TNew>> func)
+	{
+		return await (await result).MapAsync(func);
+	}
+
+	/// <summary>
+	/// Maps the success value of the result object of the completed task to a new result using a mapping function, or
+	/// does nothing if the result object of the completed task is a failure.
+	/// </summary>
+	/// <param name="result">A task object returning a result object when completing.</param>
+	/// <param name="func">The function used to map the success value.</param>
+	/// <typeparam name="T">The type of the object inside the result returned by the task.</typeparam>
+	/// <typeparam name="TNew">The type of the new value.</typeparam>
+	/// <returns>A new result containing either the mapped success value or the failure value of the original
+	/// result.</returns>
+	[MethodImpl(MethodImplOptions.AggressiveInlining)]
+	// ReSharper disable once InconsistentNaming
+	public static async Task<Result<TNew>> Then<T, TNew>(this Task<Result<T>> result, Func<T, Result<TNew>> func)
+	{
+		return (await result).Then(func);
+	}
+
+	/// <inheritdoc cref="Then{T,TNew}(Task{Result{T}},Func{T,Result{TNew}})"/>
+	[MethodImpl(MethodImplOptions.AggressiveInlining)]
+	public static async Task<Result<TNew>> ThenAsync<T, TNew>(this Task<Result<T>> result, Func<T, ValueTask<Result<TNew>>> func)
+	{
+		return await (await result).ThenAsync(func);
+	}
+
+	#endregion
+
+	#region ValueTask<Result<T>>
+
+	/// <inheritdoc cref="Map{T,TNew}(Task{Result{T}},Func{T,TNew})"/>
+	[MethodImpl(MethodImplOptions.AggressiveInlining)]
+	// ReSharper disable once InconsistentNaming
+	public static async ValueTask<Result<TNew>> Map<T, TNew>(this ValueTask<Result<T>> result, Func<T, TNew> func)
+	{
+		return (await result).Map(func);
+	}
+
+	/// <inheritdoc cref="Map{T,TNew}(Task{Result{T}},Func{T,TNew})"/>
+	[MethodImpl(MethodImplOptions.AggressiveInlining)]
+	public static async ValueTask<Result<TNew>> MapAsync<T, TNew>(this ValueTask<Result<T>> result, Func<T, ValueTask<TNew>> func)
+	{
+		return await (await result).MapAsync(func);
+	}
+
+	/// <inheritdoc cref="Then{T,TNew}(Task{Result{T}},Func{T,Result{TNew}})"/>
+	[MethodImpl(MethodImplOptions.AggressiveInlining)]
+	// ReSharper disable once InconsistentNaming
+	public static async ValueTask<Result<TNew>> Then<T, TNew>(this ValueTask<Result<T>> result, Func<T, Result<TNew>> func)
+	{
+		return (await result).Then(func);
+	}
+
+	/// <inheritdoc cref="Then{T,TNew}(Task{Result{T}},Func{T,Result{TNew}})"/>
+	[MethodImpl(MethodImplOptions.AggressiveInlining)]
+	public static async ValueTask<Result<TNew>> ThenAsync<T, TNew>(this ValueTask<Result<T>> result, Func<T, ValueTask<Result<TNew>>> func)
+	{
+		return await (await result).ThenAsync(func);
+	}
+
+	#endregion
+}

src/request.result/package-readme.md

@@ -0,0 +1,62 @@
+Result is a simple yet powerful [result type](https://doc.rust-lang.org/std/result/) implementation for C#, containing a
+variety of utilities and standard functions for working with result types and integrating them into the rest of C#.
+
+## Features
+
+- **Success and Failure States:** Represent successful outcomes with a value (`Prelude.Success()`) or failures with an
+  error (`Prelude.Failure()`).
+- **Immutability:** `Result<T>` objects are immutable, ensuring thread safety and preventing accidental modification.
+- **Chaining Operations:** Methods like `Map` and `Then` allow for chaining operations on successful results, promoting
+  a functional programming style.
+
+## Getting Started
+
+### Install the NuGet package:
+
+```
+dotnet add package Geekeey.Extensions.Result
+```
+
+You may need to add our NuGet Feed to your `nuget.config` this can be done by adding the following lines
+
+```xml
+<packageSources>
+	<add key="geekeey" value="https://git.geekeey.de/api/packages/geekeey/nuget/index.json" />
+</packageSources>
+```
+
+### Usage
+
+```csharp
+public Result<int> Divide(int dividend, int divisor)
+{
+  if (divisor == 0)
+  {
+    return Prelude.Failure<int>("Division by zero");
+  }
+
+  return Prelude.Success(dividend / divisor);
+}
+
+if (result.IsSuccess)
+{
+  Console.WriteLine("Result: " + result.Value);
+}
+else
+{
+  Console.WriteLine("Error: " + result.Error);
+}
+```
+
+```csharp
+_ = await Prelude.Try(() => File.ReadAllLines("i_do_not_exist.txt"))
+  ThenAsync(static async Task<Result<IReadOnlyList<int>>> (list) =>
+  {
+      using var client = new HttpClient();
+      Task<Result<int>> DoSomeThing(string line)
+          => Prelude.TryAsync(() => client.GetAsync(line))
+              .Map(static async response => int.Parse(await response.Content.ReadAsStringAsync()));
+      var results = await Task.WhenAll(list.Select(DoSomeThing).ToArray());
+      return results.Join();
+  });
+```

src/request.tests/.editorconfig

@@ -0,0 +1,9 @@
+
+[*.{cs,vb}]
+# disable CA1822: Mark members as static
+# -> TUnit requiring instance methods for test cases
+dotnet_diagnostic.CA1822.severity = none
+# disable CA1707: Identifiers should not contain underscores
+dotnet_diagnostic.CA1707.severity = none
+# disable IDE0060: Remove unused parameter
+dotnet_diagnostic.IDE0060.severity = none

src/request.tests/Geekeey.Request.Tests.csproj

@@ -0,0 +1,23 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net10.0</TargetFramework>
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="TUnit" />
+    <!-- additional packages -->
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <AssemblyAttribute Include="System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverageAttribute" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\request\Geekeey.Request.csproj" />
+  </ItemGroup>
+
+</Project>

src/request.tests/RequestDispatcherBuilderExtensionsTests.cs

@@ -0,0 +1,120 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Options;
+
+namespace Geekeey.Request.Tests;
+
+internal sealed class RequestDispatcherBuilderExtensionsTests
+{
+	[Test]
+	public async Task I_can_add_a_type_and_register_the_options()
+	{
+		// Arrange
+		var services = new ServiceCollection();
+		var builder = services.AddRequestDispatcher();
+		var type = typeof(TestHandler);
+
+		// Act
+		builder.Add(type);
+
+		// Assert
+		var provider = services.BuildServiceProvider();
+		var options = provider.GetRequiredService<IOptions<RequestDispatcherOptions>>().Value;
+
+		var handlers = options.GetRequestHandlers<IScalarRequestHandler<TestRequest, string>>(provider);
+		await Assert.That(handlers).Count().IsEqualTo(1);
+		await Assert.That(handlers.First()).IsTypeOf<TestHandler>();
+	}
+
+	[Test]
+	public async Task I_can_add_a_type_with_a_lifetime_and_register_the_options_and_service()
+	{
+		// Arrange
+		var services = new ServiceCollection();
+		var builder = services.AddRequestDispatcher();
+		var type = typeof(TestHandler);
+		var lifetime = ServiceLifetime.Scoped;
+
+		// Act
+		builder.Add(type, lifetime);
+
+		// Assert
+		var serviceDescriptor = services.FirstOrDefault(sd => sd.ServiceType == type);
+		await Assert.That(serviceDescriptor).IsNotNull();
+		await Assert.That(serviceDescriptor.Lifetime).IsEqualTo(lifetime);
+		await Assert.That(serviceDescriptor.ImplementationType).IsEqualTo(type);
+
+		var provider = services.BuildServiceProvider();
+		var options = provider.GetRequiredService<IOptions<RequestDispatcherOptions>>().Value;
+		var handlers = options.GetRequestHandlers<IScalarRequestHandler<TestRequest, string>>(provider);
+
+		await Assert.That(handlers).Count().IsEqualTo(1);
+	}
+
+	[Test]
+	public async Task I_can_add_an_enumerable_of_types_and_register_the_options()
+	{
+		// Arrange
+		var services = new ServiceCollection();
+		var builder = services.AddRequestDispatcher();
+		var types = new[] { typeof(TestHandler), typeof(AnotherTestHandler) };
+
+		// Act
+		builder.Add(types);
+
+		// Assert
+		var provider = services.BuildServiceProvider();
+		var options = provider.GetRequiredService<IOptions<RequestDispatcherOptions>>().Value;
+
+		var handlers1 = options.GetRequestHandlers<IScalarRequestHandler<TestRequest, string>>(provider);
+		await Assert.That(handlers1).Count().IsEqualTo(1);
+		await Assert.That(handlers1.First()).IsTypeOf<TestHandler>();
+
+		var handlers2 = options.GetRequestHandlers<IScalarRequestHandler<AnotherTestRequest, string>>(provider);
+		await Assert.That(handlers2).Count().IsEqualTo(1);
+		await Assert.That(handlers2.First()).IsTypeOf<AnotherTestHandler>();
+	}
+
+	[Test]
+	public async Task I_can_add_an_enumerable_of_types_with_a_lifetime_and_register_the_options_and_services()
+	{
+		// Arrange
+		var services = new ServiceCollection();
+		var builder = services.AddRequestDispatcher();
+		var types = new[] { typeof(TestHandler), typeof(AnotherTestHandler) };
+		var lifetime = ServiceLifetime.Singleton;
+
+		// Act
+		builder.Add(types, lifetime);
+
+		// Assert
+		foreach (var type in types)
+		{
+			var serviceDescriptor = services.FirstOrDefault(sd => sd.ServiceType == type);
+			await Assert.That(serviceDescriptor).IsNotNull();
+			await Assert.That(serviceDescriptor.Lifetime).IsEqualTo(lifetime);
+		}
+
+		var provider = services.BuildServiceProvider();
+		var options = provider.GetRequiredService<IOptions<RequestDispatcherOptions>>().Value;
+
+		await Assert.That(options.GetRequestHandlers<IScalarRequestHandler<TestRequest, string>>(provider)).Count().IsEqualTo(1);
+		await Assert.That(options.GetRequestHandlers<IScalarRequestHandler<AnotherTestRequest, string>>(provider)).Count().IsEqualTo(1);
+	}
+
+	[Test]
+	public async Task I_can_see_it_throw_when_the_builder_is_null()
+	{
+		IRequestDispatcherBuilder builder = null!;
+
+		using (Assert.Multiple())
+		{
+			await Assert.That(() => builder.Add(typeof(TestHandler))).Throws<ArgumentNullException>();
+			await Assert.That(() => builder.Add(typeof(TestHandler), ServiceLifetime.Transient)).Throws<ArgumentNullException>();
+			await Assert.That(() => builder.Add([typeof(TestHandler)])).Throws<ArgumentNullException>();
+			await Assert.That(() => builder.Add([typeof(TestHandler)], ServiceLifetime.Transient)).Throws<ArgumentNullException>();
+		}
+	}
+}

src/request.tests/ScalarBehaviourTests.cs

@@ -0,0 +1,111 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+using Microsoft.Extensions.DependencyInjection;
+
+namespace Geekeey.Request.Tests;
+
+internal sealed class ScalarBehaviourTests
+{
+	[Test]
+	public async Task I_can_execute_the_closed_behaviour()
+	{
+		var sc = new ServiceCollection();
+		sc.AddSingleton<ScalarTestTracker>();
+		sc.AddRequestDispatcher(builder => builder
+			.Add(typeof(ScalarTestHandler))
+			.Add(typeof(ScalarTestBehavior)));
+		var provider = sc.BuildServiceProvider();
+		var dispatcher = provider.GetRequiredService<IRequestDispatcher>();
+		var tracker = provider.GetRequiredService<ScalarTestTracker>();
+
+		var request = new ScalarTestRequest { Value = "Hello" };
+		var result = await dispatcher.DispatchAsync(request);
+
+		await Assert.That(result).IsEquivalentTo("Hello-Handled");
+		await Assert.That(tracker.Executed).IsTrue();
+	}
+
+	[Test]
+	public async Task I_can_execute_the_open_behaviour()
+	{
+		var sc = new ServiceCollection();
+		sc.AddSingleton<ScalarTestTracker>();
+		sc.AddRequestDispatcher(builder => builder
+			.Add(typeof(ScalarTestHandler))
+			.Add(typeof(ScalarOpenBehavior<,>)));
+		var provider = sc.BuildServiceProvider();
+		var dispatcher = provider.GetRequiredService<IRequestDispatcher>();
+		var tracker = provider.GetRequiredService<ScalarTestTracker>();
+
+		var request = new ScalarTestRequest { Value = "Hello" };
+		var result = await dispatcher.DispatchAsync(request);
+
+		await Assert.That(result).IsEquivalentTo("Hello-Handled");
+		await Assert.That(tracker.Executed).IsTrue();
+	}
+
+	[Test]
+	public async Task I_can_chain_the_behaviours_in_order()
+	{
+		var sc = new ServiceCollection();
+		sc.AddSingleton<ScalarTestTracker>();
+		sc.AddRequestDispatcher(builder => builder
+			.Add(typeof(ScalarTestHandler))
+			.Add(typeof(ScalarChainedBehaviour1))
+			.Add(typeof(ScalarChainedBehaviour2)));
+		var provider = sc.BuildServiceProvider();
+		var dispatcher = provider.GetRequiredService<IRequestDispatcher>();
+		var tracker = provider.GetRequiredService<ScalarTestTracker>();
+
+		var request = new ScalarTestRequest { Value = "Hello" };
+		await dispatcher.DispatchAsync(request);
+
+		// They are discovered in the order they appear in the assembly.
+		// In this file: ChainedBehaviour1, ChainedBehaviour2
+		await Assert.That(tracker.Log).Count().IsEqualTo(2);
+		await Assert.That(tracker.Log[0]).IsEquivalentTo("Behaviour1");
+		await Assert.That(tracker.Log[1]).IsEquivalentTo("Behaviour2");
+	}
+
+	[Test]
+	public async Task I_can_work_with_a_generic_wrapper_request_and_the_open_behaviour()
+	{
+		var sc = new ServiceCollection();
+		sc.AddSingleton<ScalarTestTracker>();
+		sc.AddRequestDispatcher(builder => builder
+			.Add(typeof(ScalarTestWrapperHandler<>))
+			.Add(typeof(ScalarWrapperBehavior<>)));
+		var provider = sc.BuildServiceProvider();
+		var dispatcher = provider.GetRequiredService<IRequestDispatcher>();
+		var tracker = provider.GetRequiredService<ScalarTestTracker>();
+
+		var request = new ScalarTestWrapperRequest<int> { Item = 42 };
+		var result = await dispatcher.DispatchAsync(request);
+
+		await Assert.That(result).IsEquivalentTo("Handled-42");
+		await Assert.That(tracker.Executed).IsTrue();
+	}
+
+	[Test]
+	public async Task I_can_maintain_the_ordering_between_open_and_closed_behaviours()
+	{
+		var sc = new ServiceCollection();
+		sc.AddSingleton<ScalarTestTracker>();
+		sc.AddRequestDispatcher(builder => builder
+			.Add(typeof(ScalarTestHandler))
+			.Add(typeof(ScalarOrderingOpenBehavior<,>))
+			.Add(typeof(ScalarOrderingClosedBehavior)));
+		var provider = sc.BuildServiceProvider();
+		var dispatcher = provider.GetRequiredService<IRequestDispatcher>();
+		var tracker = provider.GetRequiredService<ScalarTestTracker>();
+
+		var request = new ScalarTestRequest { Value = "Order" };
+		await dispatcher.DispatchAsync(request);
+
+		await Assert.That(tracker.Log).Contains("OrderingOpen");
+		await Assert.That(tracker.Log).Contains("OrderingClosed");
+	}
+}
+
+// Moved to _fixtures

src/request.tests/ScalarDispatcherTests.cs

@@ -0,0 +1,251 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Options;
+
+namespace Geekeey.Request.Tests;
+
+internal sealed class ScalarDispatcherTests
+{
+	[Test]
+	public async Task I_can_dispatch_a_request_async_with_an_open_generic_handler()
+	{
+		var sc = new ServiceCollection();
+		sc.AddRequestDispatcher(builder => builder
+			.Add(typeof(OpenScalarHandler<>)));
+		var provider = sc.BuildServiceProvider();
+		var dispatcher = provider.GetRequiredService<IRequestDispatcher>();
+
+		var request = new OpenScalarRequest { Data = "Hello" };
+		var result = await dispatcher.DispatchAsync(request);
+
+		await Assert.That(result).IsEquivalentTo("Hello-Handled");
+	}
+
+	[Test]
+	public async Task I_can_dispatch_a_request_async_with_an_open_generic_handler_that_has_constraints()
+	{
+		var sc = new ServiceCollection();
+		sc.AddRequestDispatcher(builder => builder
+			.Add(typeof(ConstrainedScalarHandler<>)));
+		var provider = sc.BuildServiceProvider();
+		var dispatcher = provider.GetRequiredService<IRequestDispatcher>();
+
+		var request = new ConstrainedScalarRequest { Value = 123 };
+		var result = await dispatcher.DispatchAsync(request);
+
+		await Assert.That(result).IsEquivalentTo("123-Constrained");
+	}
+
+	[Test]
+	public async Task I_can_see_it_fail_if_no_handler_is_found_even_with_an_open_generic_available()
+	{
+		var sc = new ServiceCollection();
+		sc.AddRequestDispatcher(builder => builder
+			.Add(typeof(OpenScalarHandler<>)));
+		var provider = sc.BuildServiceProvider();
+		var dispatcher = provider.GetRequiredService<IRequestDispatcher>();
+
+		var request = new UnhandledScalarRequest();
+		await Assert.ThrowsAsync<InvalidOperationException>(async () => await dispatcher.DispatchAsync(request));
+	}
+
+	[Test]
+	public async Task I_can_dispatch_a_request_async_with_an_inherited_request()
+	{
+		var sc = new ServiceCollection();
+		sc.AddRequestDispatcher(builder => builder
+			.Add(typeof(OpenScalarHandler<>)));
+		var provider = sc.BuildServiceProvider();
+		var dispatcher = provider.GetRequiredService<IRequestDispatcher>();
+
+		// InheritedScalarRequest : OpenScalarRequest.
+		// There is no Handler<InheritedScalarRequest> but there is OpenScalarHandler<TRequest> where TRequest : OpenScalarRequest.
+		// It should be able to handle InheritedScalarRequest.
+		var request = new InheritedScalarRequest { Data = "Sub" };
+		var result = await dispatcher.DispatchAsync(request);
+
+		await Assert.That(result).IsEquivalentTo("Sub-Handled");
+	}
+
+	[Test]
+	public async Task I_can_dispatch_a_request_async_with_an_inherited_handler()
+	{
+		var sc = new ServiceCollection();
+		sc.AddRequestDispatcher(builder => builder
+			.Add(typeof(DerivedScalarHandler)));
+		var provider = sc.BuildServiceProvider();
+		var dispatcher = provider.GetRequiredService<IRequestDispatcher>();
+
+		var request = new DerivedScalarRequest { Value = 42 };
+		var result = await dispatcher.DispatchAsync(request);
+
+		await Assert.That(result).IsEquivalentTo("Derived: 42");
+	}
+
+	[Test]
+	public async Task I_can_dispatch_a_request_async_with_an_interface_inherited_request()
+	{
+		var sc = new ServiceCollection();
+		sc.AddRequestDispatcher(builder => builder
+			.Add(typeof(InterfaceInheritedScalarHandler)));
+		var provider = sc.BuildServiceProvider();
+		var dispatcher = provider.GetRequiredService<IRequestDispatcher>();
+
+		var request = new InterfaceInheritedScalarRequest { Name = "InterfaceTest" };
+		var result = await dispatcher.DispatchAsync(request);
+
+		await Assert.That(result).IsEquivalentTo("InterfaceTest-InterfaceHandled");
+	}
+
+	[Test]
+	public async Task I_can_dispatch_a_request_async_with_deep_inheritance_in_the_request()
+	{
+		var sc = new ServiceCollection();
+		sc.AddRequestDispatcher(builder => builder
+			.Add(typeof(OpenScalarHandler<>)));
+		var provider = sc.BuildServiceProvider();
+		var dispatcher = provider.GetRequiredService<IRequestDispatcher>();
+
+		var request = new DeepDerivedScalarRequest { Data = "Deep", DeepValue = 99 };
+		var result = await dispatcher.DispatchAsync(request);
+
+		// OpenScalarHandler<TRequest> where TRequest : OpenScalarRequest should handle this
+		await Assert.That(result).IsEquivalentTo("Deep-Handled");
+	}
+
+	[Test]
+	public async Task I_can_dispatch_a_request_async_with_an_interface_constrained_handler()
+	{
+		var sc = new ServiceCollection();
+		sc.AddRequestDispatcher(builder => builder
+			.Add(typeof(InterfaceInheritedScalarHandler))
+			.Add(typeof(InterfaceConstrainedScalarHandler<>)));
+		var provider = sc.BuildServiceProvider();
+		var dispatcher = provider.GetRequiredService<IRequestDispatcher>();
+
+		var request = new InterfaceInheritedScalarRequest { Name = "Constrained" };
+		var result = await dispatcher.DispatchAsync(request);
+
+		// Both InterfaceInheritedScalarHandler and InterfaceConstrainedScalarHandler could match.
+		// InterfaceInheritedScalarHandler is a concrete match for InterfaceInheritedScalarRequest.
+		// InterfaceConstrainedScalarHandler is an open generic match.
+		// Currently Dispatcher.SendAsync checks concrete handlers first.
+		await Assert.That(result).IsEquivalentTo("Constrained-InterfaceHandled");
+	}
+
+	[Test]
+	public async Task I_can_dispatch_a_request_async_with_an_interface_only_match()
+	{
+		var sc = new ServiceCollection();
+		sc.AddRequestDispatcher(builder => builder
+			.Add(typeof(InterfaceConstrainedScalarHandler<>)));
+		var provider = sc.BuildServiceProvider();
+		var dispatcher = provider.GetRequiredService<IRequestDispatcher>();
+
+		var request = new AnotherNamedScalarRequest { Name = "InterfaceOnly" };
+		var result = await dispatcher.DispatchAsync(request);
+
+		// No concrete handler for AnotherNamedScalarRequest, but InterfaceConstrainedScalarHandler<T> where T : INamedScalarRequest matches.
+		await Assert.That(result).IsEquivalentTo("InterfaceOnly-ConstrainedByInterface");
+	}
+
+	[Test]
+	public async Task I_can_dispatch_a_request_async_with_a_nested_generic_request()
+	{
+		var sc = new ServiceCollection();
+		sc.AddRequestDispatcher(builder => builder
+			.Add(typeof(WrapperScalarHandler<>)));
+		var provider = sc.BuildServiceProvider();
+		var dispatcher = provider.GetRequiredService<IRequestDispatcher>();
+
+		var request = new WrapperScalarRequest<int> { Item = 42 };
+		var result = await dispatcher.DispatchAsync(request);
+
+		await Assert.That(result).IsEquivalentTo("Handled-42");
+	}
+
+	[Test]
+	public async Task I_can_handle_multiple_interface_implementations()
+	{
+		var sc = new ServiceCollection();
+		sc.AddRequestDispatcher(builder => builder
+			.Add(typeof(MultiInterfaceScalarHandler)));
+		var provider = sc.BuildServiceProvider();
+		var dispatcher = provider.GetRequiredService<IRequestDispatcher>();
+
+		var request = new MultiInterfaceScalarRequest();
+		var result1 = await dispatcher.DispatchAsync<int>(request);
+		var result2 = await dispatcher.DispatchAsync<string>(request);
+
+		await Assert.That(result1).IsEqualTo(1);
+		await Assert.That(result2).IsEquivalentTo("One");
+	}
+
+	[Test]
+	public async Task I_can_see_it_fail_if_there_are_ambiguous_handle_methods()
+	{
+		var sc = new ServiceCollection();
+		sc.AddRequestDispatcher(builder => builder
+			.Add(typeof(AmbiguousScalarHandler)));
+		var provider = sc.BuildServiceProvider();
+		var dispatcher = provider.GetRequiredService<IRequestDispatcher>();
+
+		var request = new AmbiguousScalarRequest();
+		var result = await dispatcher.DispatchAsync(request);
+
+		await Assert.That(result).IsEquivalentTo("Interface-Handled");
+	}
+
+	[Test]
+	public async Task I_can_dispatch_a_request_async_with_a_generic_interface_explicit_implementation()
+	{
+		var sc = new ServiceCollection();
+		sc.AddRequestDispatcher(builder => builder
+			.Add(typeof(ExplicitGenericScalarHandler<>)));
+		var provider = sc.BuildServiceProvider();
+		var dispatcher = provider.GetRequiredService<IRequestDispatcher>();
+
+		var request = new ExplicitGenericScalarRequest { Value = "Explicit" };
+		var result = await dispatcher.DispatchAsync(request);
+
+		await Assert.That(result).IsEquivalentTo("Explicit-ExplicitHandled");
+	}
+
+	[Test]
+	public async Task I_can_see_it_throw_the_original_exception()
+	{
+		var sc = new ServiceCollection();
+		sc.AddRequestDispatcher(builder => builder
+			.Add(typeof(FailingScalarHandler)));
+		var provider = sc.BuildServiceProvider();
+		var dispatcher = provider.GetRequiredService<IRequestDispatcher>();
+
+		var request = new FailingScalarRequest();
+		var ex = await Assert.That(async () => await dispatcher.DispatchAsync(request)).Throws<InvalidOperationException>();
+
+		using (Assert.Multiple())
+		{
+			await Assert.That(ex?.Message).IsEquivalentTo("Handler failed");
+			// Assert that the stack trace contains the handler's method name,
+			// which proves the exception was rethrown while preserving its origin.
+			await Assert.That(ex?.StackTrace).Contains(nameof(FailingScalarHandler.HandleAsync));
+		}
+	}
+
+	[Test]
+	public async Task I_can_see_it_throw_if_dispatcher_options_are_modified_after_build()
+	{
+		var sc = new ServiceCollection();
+		sc.AddRequestDispatcher(builder => builder
+			.Add(typeof(FailingScalarHandler)));
+		var provider = sc.BuildServiceProvider();
+		var options = provider.GetRequiredService<IOptions<RequestDispatcherOptions>>().Value;
+		options.GetRequestBehaviors<IScalarRequestHandler<FailingScalarRequest, string>>(default!);
+
+		await Assert.That(() => options.Inspect([])).Throws<InvalidOperationException>();
+	}
+}
+
+// Moved to _fixtures

src/request.tests/StreamBehaviourTests.cs

@@ -0,0 +1,110 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+using Microsoft.Extensions.DependencyInjection;
+
+namespace Geekeey.Request.Tests;
+
+internal sealed class StreamBehaviourTests
+{
+	[Test]
+	public async Task I_can_execute_the_closed_behaviour()
+	{
+		var sc = new ServiceCollection();
+		sc.AddSingleton<StreamTestTracker>();
+		sc.AddRequestDispatcher(builder => builder
+			.Add(typeof(StreamTestHandler))
+			.Add(typeof(StreamTestBehavior)));
+		var provider = sc.BuildServiceProvider();
+		var dispatcher = provider.GetRequiredService<IRequestDispatcher>();
+		var tracker = provider.GetRequiredService<StreamTestTracker>();
+
+		var request = new StreamTestRequest { Value = "Hello" };
+		var results = await dispatcher.DispatchAsync(request).ToListAsync();
+
+		await Assert.That(results).IsEquivalentTo(["Hello-Handled-0", "Hello-Handled-1"]);
+		await Assert.That(tracker.Executed).IsTrue();
+	}
+
+	[Test]
+	public async Task I_can_execute_the_open_behaviour()
+	{
+		var sc = new ServiceCollection();
+		sc.AddSingleton<StreamTestTracker>();
+		sc.AddRequestDispatcher(builder => builder
+			.Add(typeof(StreamTestHandler))
+			.Add(typeof(StreamOpenBehavior<,>)));
+		var provider = sc.BuildServiceProvider();
+		var dispatcher = provider.GetRequiredService<IRequestDispatcher>();
+		var tracker = provider.GetRequiredService<StreamTestTracker>();
+
+		var request = new StreamTestRequest { Value = "Hello" };
+		var results = await dispatcher.DispatchAsync(request).ToListAsync();
+
+		await Assert.That(results).IsEquivalentTo(["Hello-Handled-0", "Hello-Handled-1"]);
+		await Assert.That(tracker.Executed).IsTrue();
+	}
+
+	[Test]
+	public async Task I_can_chain_the_behaviours_in_order()
+	{
+		var sc = new ServiceCollection();
+		sc.AddSingleton<StreamTestTracker>();
+		sc.AddRequestDispatcher(builder => builder
+			.Add(typeof(StreamTestHandler))
+			.Add(typeof(StreamChainedBehaviour1))
+			.Add(typeof(StreamChainedBehaviour2)));
+		var provider = sc.BuildServiceProvider();
+		var dispatcher = provider.GetRequiredService<IRequestDispatcher>();
+		var tracker = provider.GetRequiredService<StreamTestTracker>();
+
+		var request = new StreamTestRequest { Value = "Hello" };
+		await dispatcher.DispatchAsync(request).ToListAsync();
+
+		await Assert.That(tracker.Log).Count().IsEqualTo(2);
+		await Assert.That(tracker.Log[0]).IsEquivalentTo("Behaviour1");
+		await Assert.That(tracker.Log[1]).IsEquivalentTo("Behaviour2");
+	}
+
+	[Test]
+	public async Task I_can_work_with_a_generic_wrapper_request_and_the_open_behaviour()
+	{
+		var sc = new ServiceCollection();
+		sc.AddSingleton<StreamTestTracker>();
+		sc.AddRequestDispatcher(builder => builder
+			.Add(typeof(StreamTestWrapperHandler<>))
+			.Add(typeof(StreamWrapperBehavior<>)));
+		var provider = sc.BuildServiceProvider();
+		var dispatcher = provider.GetRequiredService<IRequestDispatcher>();
+		var tracker = provider.GetRequiredService<StreamTestTracker>();
+
+		var request = new StreamTestWrapperRequest<int> { Item = 42 };
+		var results = await dispatcher.DispatchAsync(request).ToListAsync();
+
+		await Assert.That(results).IsEquivalentTo(["Handled-42-0", "Handled-42-1"]);
+		await Assert.That(tracker.Executed).IsTrue();
+	}
+
+	[Test]
+	public async Task I_can_maintain_the_ordering_between_open_and_closed_behaviours()
+	{
+		var sc = new ServiceCollection();
+		sc.AddSingleton<StreamTestTracker>();
+		sc.AddRequestDispatcher(builder => builder
+			.Add(typeof(StreamTestHandler))
+			.Add(typeof(StreamOrderingOpenBehavior<,>))
+			.Add(typeof(StreamOrderingClosedBehavior)));
+		var provider = sc.BuildServiceProvider();
+		var dispatcher = provider.GetRequiredService<IRequestDispatcher>();
+		var tracker = provider.GetRequiredService<StreamTestTracker>();
+
+		var request = new StreamTestRequest { Value = "Order" };
+		await dispatcher.DispatchAsync(request).ToListAsync();
+
+		var log = tracker.Log.ToList();
+		await Assert.That(log).Contains("Open");
+		await Assert.That(log).Contains("Closed");
+	}
+}
+
+// Moved to _fixtures

src/request.tests/StreamDispatcherTests.cs

@@ -0,0 +1,243 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+using Microsoft.Extensions.DependencyInjection;
+
+namespace Geekeey.Request.Tests;
+
+public class StreamDispatcherTests
+{
+	[Test]
+	public async Task I_can_dispatch_a_request_async_with_an_open_generic_handler()
+	{
+		var sc = new ServiceCollection();
+		sc.AddRequestDispatcher(builder => builder
+			.Add(typeof(OpenStreamHandler<>)));
+		var provider = sc.BuildServiceProvider();
+		var dispatcher = provider.GetRequiredService<IRequestDispatcher>();
+
+		var request = new OpenStreamRequest { Data = "Hello" };
+		var results = await dispatcher.DispatchAsync(request).ToListAsync();
+
+		await Assert.That(results).IsEquivalentTo(["Hello-Stream-0", "Hello-Stream-1"]);
+	}
+
+	[Test]
+	public async Task I_can_dispatch_a_request_async_with_an_open_generic_handler_that_has_constraints()
+	{
+		var sc = new ServiceCollection();
+		sc.AddRequestDispatcher(builder => builder
+			.Add(typeof(ConstrainedStreamHandler<>)));
+		var provider = sc.BuildServiceProvider();
+		var dispatcher = provider.GetRequiredService<IRequestDispatcher>();
+
+		var request = new ConstrainedStreamRequest { Value = 123 };
+		var results = await dispatcher.DispatchAsync(request).ToListAsync();
+
+		await Assert.That(results).IsEquivalentTo(["123-Constrained-0", "123-Constrained-1"]);
+	}
+
+	[Test]
+	public async Task I_can_see_it_fail_if_no_handler_is_found_even_with_an_open_generic_available()
+	{
+		var sc = new ServiceCollection();
+		sc.AddRequestDispatcher(builder => builder
+			.Add(typeof(OpenStreamHandler<>)));
+		var provider = sc.BuildServiceProvider();
+		var dispatcher = provider.GetRequiredService<IRequestDispatcher>();
+
+		var request = new UnhandledStreamRequest();
+		await Assert.ThrowsAsync<InvalidOperationException>(async () => await dispatcher.DispatchAsync(request).FirstOrDefaultAsync().AsTask());
+	}
+
+	[Test]
+	public async Task I_can_dispatch_a_request_async_with_an_inherited_request()
+	{
+		var sc = new ServiceCollection();
+		sc.AddRequestDispatcher(builder => builder
+			.Add(typeof(OpenStreamHandler<>)));
+		var provider = sc.BuildServiceProvider();
+		var dispatcher = provider.GetRequiredService<IRequestDispatcher>();
+
+		var request = new InheritedStreamRequest { Data = "Sub" };
+		var results = await dispatcher.DispatchAsync(request).ToListAsync();
+
+		await Assert.That(results).IsEquivalentTo(["Sub-Stream-0", "Sub-Stream-1"]);
+	}
+
+	[Test]
+	public async Task I_can_dispatch_a_request_async_with_an_inherited_handler()
+	{
+		var sc = new ServiceCollection();
+		sc.AddRequestDispatcher(builder => builder
+			.Add(typeof(DerivedStreamHandler)));
+		var provider = sc.BuildServiceProvider();
+		var dispatcher = provider.GetRequiredService<IRequestDispatcher>();
+
+		var request = new DerivedStreamRequest { Value = 42 };
+		var results = await dispatcher.DispatchAsync(request).ToListAsync();
+
+		await Assert.That(results).IsEquivalentTo(["Derived: 42-0", "Derived: 42-1"]);
+	}
+
+	[Test]
+	public async Task I_can_dispatch_a_request_async_with_an_interface_inherited_request()
+	{
+		var sc = new ServiceCollection();
+		sc.AddRequestDispatcher(builder => builder
+			.Add(typeof(InterfaceInheritedStreamHandler)));
+		var provider = sc.BuildServiceProvider();
+		var dispatcher = provider.GetRequiredService<IRequestDispatcher>();
+
+		var request = new InterfaceInheritedStreamRequest { Name = "InterfaceTest" };
+		var results = await dispatcher.DispatchAsync(request).ToListAsync();
+
+		await Assert.That(results).IsEquivalentTo(["InterfaceTest-InterfaceHandled-0", "InterfaceTest-InterfaceHandled-1"]);
+	}
+
+	[Test]
+	public async Task I_can_dispatch_a_request_async_with_deep_inheritance_in_the_request()
+	{
+		var sc = new ServiceCollection();
+		sc.AddRequestDispatcher(builder => builder
+			.Add(typeof(OpenStreamHandler<>)));
+		var provider = sc.BuildServiceProvider();
+		var dispatcher = provider.GetRequiredService<IRequestDispatcher>();
+
+		var request = new DeepDerivedStreamRequest { Data = "Deep", DeepValue = 99 };
+		var results = await dispatcher.DispatchAsync(request).ToListAsync();
+
+		await Assert.That(results).IsEquivalentTo(["Deep-Stream-0", "Deep-Stream-1"]);
+	}
+
+	[Test]
+	public async Task I_can_dispatch_a_request_async_with_an_interface_constrained_handler()
+	{
+		var sc = new ServiceCollection();
+		sc.AddRequestDispatcher(builder => builder
+			.Add(typeof(InterfaceInheritedStreamHandler))
+			.Add(typeof(InterfaceConstrainedStreamHandler<>)));
+		var provider = sc.BuildServiceProvider();
+		var dispatcher = provider.GetRequiredService<IRequestDispatcher>();
+
+		var request = new InterfaceInheritedStreamRequest { Name = "Constrained" };
+		var results = await dispatcher.DispatchAsync(request).ToListAsync();
+
+		// Both InterfaceInheritedStreamHandler and InterfaceConstrainedStreamHandler could match.
+		// InterfaceInheritedStreamHandler is a concrete match for InterfaceInheritedStreamRequest.
+		// InterfaceConstrainedStreamHandler is an open generic match.
+		// Currently Dispatcher checks concrete handlers first.
+		await Assert.That(results).IsEquivalentTo(["Constrained-InterfaceHandled-0", "Constrained-InterfaceHandled-1"]);
+	}
+
+	[Test]
+	public async Task I_can_dispatch_a_request_async_with_an_interface_only_match()
+	{
+		var sc = new ServiceCollection();
+		sc.AddRequestDispatcher(builder => builder
+			.Add(typeof(InterfaceConstrainedStreamHandler<>)));
+		var provider = sc.BuildServiceProvider();
+		var dispatcher = provider.GetRequiredService<IRequestDispatcher>();
+
+		var request = new AnotherNamedStreamRequest { Name = "InterfaceOnly" };
+		var results = await dispatcher.DispatchAsync(request).ToListAsync();
+
+		await Assert.That(results).IsEquivalentTo(["InterfaceOnly-ConstrainedByInterface-0", "InterfaceOnly-ConstrainedByInterface-1"]);
+	}
+
+	[Test]
+	public async Task I_can_dispatch_a_request_async_with_a_nested_generic_request()
+	{
+		var sc = new ServiceCollection();
+		sc.AddRequestDispatcher(builder => builder
+			.Add(typeof(WrapperStreamHandler<>)));
+		var provider = sc.BuildServiceProvider();
+		var dispatcher = provider.GetRequiredService<IRequestDispatcher>();
+
+		var request = new WrapperStreamRequest<int> { Item = 42 };
+		var results = await dispatcher.DispatchAsync(request).ToListAsync();
+
+		await Assert.That(results).IsEquivalentTo(["Handled-42-0", "Handled-42-1"]);
+	}
+
+	[Test]
+	public async Task I_can_handle_multiple_interface_implementations()
+	{
+		var sc = new ServiceCollection();
+		sc.AddRequestDispatcher(builder => builder
+			.Add(typeof(MultiInterfaceStreamHandler)));
+		var provider = sc.BuildServiceProvider();
+		var dispatcher = provider.GetRequiredService<IRequestDispatcher>();
+
+		var request = new MultiInterfaceStreamRequest();
+
+		var results1 = await dispatcher.DispatchAsync<int>(request).ToListAsync();
+		var results2 = await dispatcher.DispatchAsync<string>(request).ToListAsync();
+
+		await Assert.That(results1).IsEquivalentTo([1, 2]);
+		await Assert.That(results2).IsEquivalentTo(["One", "Two"]);
+	}
+
+	[Test]
+	public async Task I_can_see_it_fail_if_there_are_ambiguous_handle_methods()
+	{
+		var sc = new ServiceCollection();
+		sc.AddRequestDispatcher(builder => builder
+			.Add(typeof(AmbiguousStreamHandler)));
+		var provider = sc.BuildServiceProvider();
+		var dispatcher = provider.GetRequiredService<IRequestDispatcher>();
+
+		var request = new AmbiguousStreamRequest();
+		var results = await dispatcher.DispatchAsync(request).ToListAsync();
+
+		await Assert.That(results).IsEquivalentTo(["Interface-Handled"]);
+	}
+
+	[Test]
+	public async Task I_can_dispatch_a_request_async_with_a_generic_interface_explicit_implementation()
+	{
+		var sc = new ServiceCollection();
+		sc.AddRequestDispatcher(builder => builder
+			.Add(typeof(ExplicitGenericStreamHandler<>)));
+		var provider = sc.BuildServiceProvider();
+		var dispatcher = provider.GetRequiredService<IRequestDispatcher>();
+
+		var request = new ExplicitGenericStreamRequest { Value = "Explicit" };
+		var results = await dispatcher.DispatchAsync(request).ToListAsync();
+
+		await Assert.That(results).IsEquivalentTo(["Explicit-ExplicitHandled"]);
+	}
+
+	[Test]
+	public async Task I_can_see_it_throw_the_original_exception()
+	{
+		var sc = new ServiceCollection();
+		sc.AddRequestDispatcher(builder => builder
+			.Add(typeof(FailingStreamHandler)));
+		var provider = sc.BuildServiceProvider();
+		var dispatcher = provider.GetRequiredService<IRequestDispatcher>();
+
+		var request = new FailingStreamRequest();
+		var enumerable = dispatcher.DispatchAsync(request);
+		var ex = await Assert.ThrowsAsync<InvalidOperationException>(async () => await enumerable.ToListAsync().AsTask());
+
+		using (Assert.Multiple())
+		{
+			await Assert.That(ex?.Message).IsEquivalentTo("Handler failed");
+			await Assert.That(ex?.StackTrace).Contains(nameof(FailingStreamHandler.HandleAsync));
+		}
+	}
+
+	[Test]
+	public async Task I_can_see_it_throw_if_dispatcher_options_are_modified_after_build()
+	{
+		var sc = new ServiceCollection();
+		sc.AddRequestDispatcher(builder => builder
+			.Add(typeof(FailingStreamHandler)));
+		var provider = sc.BuildServiceProvider();
+		var options = provider.GetRequiredService<Microsoft.Extensions.Options.IOptions<RequestDispatcherOptions>>().Value;
+		options.GetRequestHandlers<IStreamRequestHandler<FailingStreamRequest, string>>(default!);
+
+		await Assert.That(() => options.Inspect([])).Throws<InvalidOperationException>();
+	}
+}

src/request.tests/_fixtures/AmbiguousScalarHandler.cs

@@ -0,0 +1,19 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class AmbiguousScalarHandler : IScalarRequestHandler<AmbiguousScalarRequest, string>
+{
+	// Public method with the same name and signature
+	public Task<string> HandleAsync(AmbiguousScalarRequest request, CancellationToken ct)
+	{
+		return Task.FromResult("Public-Handled");
+	}
+
+	// Explicit interface implementation
+	Task<string> IScalarRequestHandler<AmbiguousScalarRequest, string>.HandleAsync(AmbiguousScalarRequest request, CancellationToken ct)
+	{
+		return Task.FromResult("Interface-Handled");
+	}
+}

src/request.tests/_fixtures/AmbiguousScalarRequest.cs

@@ -0,0 +1,8 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class AmbiguousScalarRequest : IScalarRequest<string>
+{
+}

src/request.tests/_fixtures/AmbiguousStreamHandler.cs

@@ -0,0 +1,19 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class AmbiguousStreamHandler : IStreamRequestHandler<AmbiguousStreamRequest, string>
+{
+	// Public method with the same name and signature
+	public async IAsyncEnumerable<string> HandleAsync(AmbiguousStreamRequest request, [System.Runtime.CompilerServices.EnumeratorCancellation] CancellationToken cancellationToken)
+	{
+		yield return "Public-Handled";
+	}
+
+	// Explicit interface implementation
+	async IAsyncEnumerable<string> IStreamRequestHandler<AmbiguousStreamRequest, string>.HandleAsync(AmbiguousStreamRequest request, [System.Runtime.CompilerServices.EnumeratorCancellation] CancellationToken cancellationToken)
+	{
+		yield return "Interface-Handled";
+	}
+}

src/request.tests/_fixtures/AmbiguousStreamRequest.cs

@@ -0,0 +1,8 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class AmbiguousStreamRequest : IStreamRequest<string>
+{
+}

src/request.tests/_fixtures/AnotherNamedScalarRequest.cs

@@ -0,0 +1,9 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class AnotherNamedScalarRequest : INamedScalarRequest
+{
+	public string Name { get; set; } = string.Empty;
+}

src/request.tests/_fixtures/AnotherNamedStreamRequest.cs

@@ -0,0 +1,9 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class AnotherNamedStreamRequest : INamedStreamRequest
+{
+	public string Name { get; set; } = string.Empty;
+}

src/request.tests/_fixtures/AnotherTestHandler.cs

@@ -0,0 +1,12 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+internal sealed class AnotherTestHandler : IScalarRequestHandler<AnotherTestRequest, string>
+{
+	public Task<string> HandleAsync(AnotherTestRequest request, CancellationToken ct)
+	{
+		return Task.FromResult("ok");
+	}
+}

src/request.tests/_fixtures/AnotherTestRequest.cs

@@ -0,0 +1,6 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+internal sealed class AnotherTestRequest : IScalarRequest<string> { }

src/request.tests/_fixtures/BaseScalarHandler.cs

@@ -0,0 +1,10 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public abstract class BaseScalarHandler<TRequest> : IScalarRequestHandler<TRequest, string>
+	where TRequest : IScalarRequest<string>
+{
+	public abstract Task<string> HandleAsync(TRequest request, CancellationToken cancellationToken);
+}

src/request.tests/_fixtures/BaseStreamHandler.cs

@@ -0,0 +1,10 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public abstract class BaseStreamHandler<TRequest> : IStreamRequestHandler<TRequest, string>
+	where TRequest : IStreamRequest<string>
+{
+	public abstract IAsyncEnumerable<string> HandleAsync(TRequest request, CancellationToken cancellationToken);
+}

src/request.tests/_fixtures/ConstrainedScalarHandler.cs

@@ -0,0 +1,13 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class ConstrainedScalarHandler<TRequest> : IScalarRequestHandler<TRequest, string>
+	where TRequest : ConstrainedScalarRequest
+{
+	public Task<string> HandleAsync(TRequest request, CancellationToken cancellationToken)
+	{
+		return Task.FromResult($"{request.Value}-Constrained");
+	}
+}

src/request.tests/_fixtures/ConstrainedScalarRequest.cs

@@ -0,0 +1,9 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class ConstrainedScalarRequest : IScalarRequest<string>
+{
+	public int Value { get; set; }
+}

src/request.tests/_fixtures/ConstrainedStreamHandler.cs

@@ -0,0 +1,14 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class ConstrainedStreamHandler<TRequest> : IStreamRequestHandler<TRequest, string>
+	where TRequest : ConstrainedStreamRequest
+{
+	public async IAsyncEnumerable<string> HandleAsync(TRequest request, [System.Runtime.CompilerServices.EnumeratorCancellation] CancellationToken cancellationToken)
+	{
+		yield return $"{request.Value}-Constrained-0";
+		yield return $"{request.Value}-Constrained-1";
+	}
+}

src/request.tests/_fixtures/ConstrainedStreamRequest.cs

@@ -0,0 +1,9 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class ConstrainedStreamRequest : IStreamRequest<string>
+{
+	public int Value { get; set; }
+}

src/request.tests/_fixtures/DeepDerivedScalarRequest.cs

@@ -0,0 +1,9 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class DeepDerivedScalarRequest : InheritedScalarRequest
+{
+	public int DeepValue { get; set; }
+}

src/request.tests/_fixtures/DeepDerivedStreamRequest.cs

@@ -0,0 +1,9 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class DeepDerivedStreamRequest : InheritedStreamRequest
+{
+	public int DeepValue { get; set; }
+}

src/request.tests/_fixtures/DerivedScalarHandler.cs

@@ -0,0 +1,12 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class DerivedScalarHandler : BaseScalarHandler<DerivedScalarRequest>
+{
+	public override Task<string> HandleAsync(DerivedScalarRequest request, CancellationToken cancellationToken)
+	{
+		return Task.FromResult($"Derived: {request.Value}");
+	}
+}

src/request.tests/_fixtures/DerivedScalarRequest.cs

@@ -0,0 +1,9 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class DerivedScalarRequest : IScalarRequest<string>
+{
+	public int Value { get; set; }
+}

src/request.tests/_fixtures/DerivedStreamHandler.cs

@@ -0,0 +1,13 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class DerivedStreamHandler : BaseStreamHandler<DerivedStreamRequest>
+{
+	public override async IAsyncEnumerable<string> HandleAsync(DerivedStreamRequest request, [System.Runtime.CompilerServices.EnumeratorCancellation] CancellationToken cancellationToken)
+	{
+		yield return $"Derived: {request.Value}-0";
+		yield return $"Derived: {request.Value}-1";
+	}
+}

src/request.tests/_fixtures/DerivedStreamRequest.cs

@@ -0,0 +1,9 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class DerivedStreamRequest : IStreamRequest<string>
+{
+	public int Value { get; set; }
+}

src/request.tests/_fixtures/ExplicitGenericScalarHandler.cs

@@ -0,0 +1,12 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class ExplicitGenericScalarHandler<T> : IScalarRequestHandler<ExplicitGenericScalarRequest, string>
+{
+	Task<string> IScalarRequestHandler<ExplicitGenericScalarRequest, string>.HandleAsync(ExplicitGenericScalarRequest request, CancellationToken ct)
+	{
+		return Task.FromResult($"{request.Value}-ExplicitHandled");
+	}
+}

src/request.tests/_fixtures/ExplicitGenericScalarRequest.cs

@@ -0,0 +1,9 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class ExplicitGenericScalarRequest : IScalarRequest<string>
+{
+	public string Value { get; set; } = string.Empty;
+}

src/request.tests/_fixtures/ExplicitGenericStreamHandler.cs

@@ -0,0 +1,12 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class ExplicitGenericStreamHandler<T> : IStreamRequestHandler<ExplicitGenericStreamRequest, string>
+{
+	async IAsyncEnumerable<string> IStreamRequestHandler<ExplicitGenericStreamRequest, string>.HandleAsync(ExplicitGenericStreamRequest request, [System.Runtime.CompilerServices.EnumeratorCancellation] CancellationToken ct)
+	{
+		yield return $"{request.Value}-ExplicitHandled";
+	}
+}

src/request.tests/_fixtures/ExplicitGenericStreamRequest.cs

@@ -0,0 +1,9 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class ExplicitGenericStreamRequest : IStreamRequest<string>
+{
+	public string Value { get; set; } = string.Empty;
+}

src/request.tests/_fixtures/FailingScalarHandler.cs

@@ -0,0 +1,12 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class FailingScalarHandler : IScalarRequestHandler<FailingScalarRequest, string>
+{
+	public Task<string> HandleAsync(FailingScalarRequest request, CancellationToken cancellationToken)
+	{
+		throw new InvalidOperationException("Handler failed");
+	}
+}

src/request.tests/_fixtures/FailingScalarRequest.cs

@@ -0,0 +1,8 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class FailingScalarRequest : IScalarRequest<string>
+{
+}

src/request.tests/_fixtures/FailingStreamHandler.cs

@@ -0,0 +1,13 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class FailingStreamHandler : IStreamRequestHandler<FailingStreamRequest, string>
+{
+	public async IAsyncEnumerable<string> HandleAsync(FailingStreamRequest request, [System.Runtime.CompilerServices.EnumeratorCancellation] CancellationToken cancellationToken)
+	{
+		yield return "Wait for it...";
+		throw new InvalidOperationException("Handler failed");
+	}
+}

src/request.tests/_fixtures/FailingStreamRequest.cs

@@ -0,0 +1,8 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class FailingStreamRequest : IStreamRequest<string>
+{
+}

src/request.tests/_fixtures/INamedScalarRequest.cs

@@ -0,0 +1,9 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public interface INamedScalarRequest : IScalarRequest<string>
+{
+	string Name { get; }
+}

src/request.tests/_fixtures/INamedStreamRequest.cs

@@ -0,0 +1,9 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public interface INamedStreamRequest : IStreamRequest<string>
+{
+	string Name { get; }
+}

src/request.tests/_fixtures/InheritedScalarRequest.cs

@@ -0,0 +1,8 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class InheritedScalarRequest : OpenScalarRequest
+{
+}

src/request.tests/_fixtures/InheritedStreamRequest.cs

@@ -0,0 +1,8 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class InheritedStreamRequest : OpenStreamRequest
+{
+}

src/request.tests/_fixtures/InterfaceConstrainedScalarHandler.cs

@@ -0,0 +1,13 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class InterfaceConstrainedScalarHandler<TRequest> : IScalarRequestHandler<TRequest, string>
+	where TRequest : INamedScalarRequest
+{
+	public Task<string> HandleAsync(TRequest request, CancellationToken cancellationToken)
+	{
+		return Task.FromResult($"{request.Name}-ConstrainedByInterface");
+	}
+}

src/request.tests/_fixtures/InterfaceConstrainedStreamHandler.cs

@@ -0,0 +1,14 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class InterfaceConstrainedStreamHandler<TRequest> : IStreamRequestHandler<TRequest, string>
+	where TRequest : INamedStreamRequest
+{
+	public async IAsyncEnumerable<string> HandleAsync(TRequest request, [System.Runtime.CompilerServices.EnumeratorCancellation] CancellationToken cancellationToken)
+	{
+		yield return $"{request.Name}-ConstrainedByInterface-0";
+		yield return $"{request.Name}-ConstrainedByInterface-1";
+	}
+}

src/request.tests/_fixtures/InterfaceInheritedScalarHandler.cs

@@ -0,0 +1,12 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class InterfaceInheritedScalarHandler : IScalarRequestHandler<InterfaceInheritedScalarRequest, string>
+{
+	public Task<string> HandleAsync(InterfaceInheritedScalarRequest request, CancellationToken cancellationToken)
+	{
+		return Task.FromResult($"{request.Name}-InterfaceHandled");
+	}
+}

src/request.tests/_fixtures/InterfaceInheritedScalarRequest.cs

@@ -0,0 +1,9 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class InterfaceInheritedScalarRequest : INamedScalarRequest
+{
+	public string Name { get; set; } = string.Empty;
+}

src/request.tests/_fixtures/InterfaceInheritedStreamHandler.cs

@@ -0,0 +1,13 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class InterfaceInheritedStreamHandler : IStreamRequestHandler<InterfaceInheritedStreamRequest, string>
+{
+	public async IAsyncEnumerable<string> HandleAsync(InterfaceInheritedStreamRequest request, [System.Runtime.CompilerServices.EnumeratorCancellation] CancellationToken cancellationToken)
+	{
+		yield return $"{request.Name}-InterfaceHandled-0";
+		yield return $"{request.Name}-InterfaceHandled-1";
+	}
+}

src/request.tests/_fixtures/InterfaceInheritedStreamRequest.cs

@@ -0,0 +1,9 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class InterfaceInheritedStreamRequest : INamedStreamRequest
+{
+	public string Name { get; set; } = string.Empty;
+}

src/request.tests/_fixtures/MultiInterfaceScalarHandler.cs

@@ -0,0 +1,17 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class MultiInterfaceScalarHandler : IScalarRequestHandler<MultiInterfaceScalarRequest, int>, IScalarRequestHandler<MultiInterfaceScalarRequest, string>
+{
+	public Task<int> HandleAsync(MultiInterfaceScalarRequest request, CancellationToken cancellationToken)
+	{
+		return Task.FromResult(1);
+	}
+
+	Task<string> IScalarRequestHandler<MultiInterfaceScalarRequest, string>.HandleAsync(MultiInterfaceScalarRequest request, CancellationToken ct)
+	{
+		return Task.FromResult("One");
+	}
+}

src/request.tests/_fixtures/MultiInterfaceScalarRequest.cs

@@ -0,0 +1,8 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class MultiInterfaceScalarRequest : IScalarRequest<int>, IScalarRequest<string>
+{
+}

src/request.tests/_fixtures/MultiInterfaceStreamHandler.cs

@@ -0,0 +1,19 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class MultiInterfaceStreamHandler : IStreamRequestHandler<MultiInterfaceStreamRequest, int>, IStreamRequestHandler<MultiInterfaceStreamRequest, string>
+{
+	public async IAsyncEnumerable<int> HandleAsync(MultiInterfaceStreamRequest request, [System.Runtime.CompilerServices.EnumeratorCancellation] CancellationToken cancellationToken)
+	{
+		yield return 1;
+		yield return 2;
+	}
+
+	async IAsyncEnumerable<string> IStreamRequestHandler<MultiInterfaceStreamRequest, string>.HandleAsync(MultiInterfaceStreamRequest request, [System.Runtime.CompilerServices.EnumeratorCancellation] CancellationToken ct)
+	{
+		yield return "One";
+		yield return "Two";
+	}
+}

src/request.tests/_fixtures/MultiInterfaceStreamRequest.cs

@@ -0,0 +1,8 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class MultiInterfaceStreamRequest : IStreamRequest<int>, IStreamRequest<string>
+{
+}

src/request.tests/_fixtures/OpenScalarHandler.cs

@@ -0,0 +1,13 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class OpenScalarHandler<TRequest> : IScalarRequestHandler<TRequest, string>
+where TRequest : OpenScalarRequest
+{
+	public Task<string> HandleAsync(TRequest request, CancellationToken cancellationToken)
+	{
+		return Task.FromResult($"{request.Data}-Handled");
+	}
+}

src/request.tests/_fixtures/OpenScalarRequest.cs

@@ -0,0 +1,9 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class OpenScalarRequest : IScalarRequest<string>
+{
+	public string Data { get; set; } = string.Empty;
+}

src/request.tests/_fixtures/OpenStreamHandler.cs

@@ -0,0 +1,14 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class OpenStreamHandler<TRequest> : IStreamRequestHandler<TRequest, string>
+	where TRequest : OpenStreamRequest
+{
+	public async IAsyncEnumerable<string> HandleAsync(TRequest request, [System.Runtime.CompilerServices.EnumeratorCancellation] CancellationToken cancellationToken)
+	{
+		yield return $"{request.Data}-Stream-0";
+		yield return $"{request.Data}-Stream-1";
+	}
+}

src/request.tests/_fixtures/OpenStreamRequest.cs

@@ -0,0 +1,9 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class OpenStreamRequest : IStreamRequest<string>
+{
+	public string Data { get; set; } = string.Empty;
+}

src/request.tests/_fixtures/ScalarChainedBehaviour1.cs

@@ -0,0 +1,13 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class ScalarChainedBehaviour1(ScalarTestTracker tracker) : IScalarRequestBehavior<ScalarTestRequest, string>
+{
+	public async Task<string> HandleAsync(ScalarTestRequest request, ScalarHandlerDelegate<string> next, CancellationToken cancellationToken)
+	{
+		tracker.Log.Add("Behaviour1");
+		return await next(request, cancellationToken);
+	}
+}

src/request.tests/_fixtures/ScalarChainedBehaviour2.cs

@@ -0,0 +1,13 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class ScalarChainedBehaviour2(ScalarTestTracker tracker) : IScalarRequestBehavior<ScalarTestRequest, string>
+{
+	public async Task<string> HandleAsync(ScalarTestRequest request, ScalarHandlerDelegate<string> next, CancellationToken cancellationToken)
+	{
+		tracker.Log.Add("Behaviour2");
+		return await next(request, cancellationToken);
+	}
+}

src/request.tests/_fixtures/ScalarOpenBehavior.cs

@@ -0,0 +1,14 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class ScalarOpenBehavior<TRequest, TResponse>(ScalarTestTracker tracker) : IScalarRequestBehavior<TRequest, TResponse>
+where TRequest : IScalarRequest<TResponse>
+{
+	public async Task<TResponse> HandleAsync(TRequest request, ScalarHandlerDelegate<TResponse> next, CancellationToken cancellationToken)
+	{
+		tracker.Executed = true;
+		return await next(request, cancellationToken);
+	}
+}

src/request.tests/_fixtures/ScalarOrderingClosedBehavior.cs

@@ -0,0 +1,13 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Tests;
+
+public class ScalarOrderingClosedBehavior(ScalarTestTracker tracker) : IScalarRequestBehavior<ScalarTestRequest, string>
+{
+	public Task<string> HandleAsync(ScalarTestRequest request, ScalarHandlerDelegate<string> next, CancellationToken cancellationToken)
+	{
+		tracker.Log.Add("OrderingClosed");
+		return next(request, cancellationToken);
+	}
+}