#1687 - Make ResilienceContextPool settable via DI

src/Polly.Core/PublicAPI.Unshipped.txt

@@ -1 +1,3 @@
 #nullable enable
+Polly.ResiliencePipelineBuilderBase.ContextPool.get -> Polly.ResilienceContextPool?
+Polly.ResiliencePipelineBuilderBase.ContextPool.set -> void

src/Polly.Core/Registry/RegistryPipelineComponentBuilder.cs

@@ -30,23 +30,25 @@ public RegistryPipelineComponentBuilder(
         _configure = configure;
     }
 
-    internal PipelineComponent CreateComponent()
+    internal (ResilienceContextPool? contextPool, PipelineComponent component) CreateComponent()
     {
         var builder = CreateBuilder();
         var component = builder.ComponentFactory();
 
         if (builder.ReloadTokens.Count == 0)
         {
-            return component;
+            return (builder.Instance.ContextPool, component);
         }
 
-        return PipelineComponentFactory.CreateReloadable(
+        component = PipelineComponentFactory.CreateReloadable(
             new ReloadableComponent.Entry(component, builder.ReloadTokens, builder.Telemetry),
             () =>
             {
                 var builder = CreateBuilder();
                 return new ReloadableComponent.Entry(builder.ComponentFactory(), builder.ReloadTokens, builder.Telemetry);
             });
+
+        return (builder.Instance.ContextPool, component);
     }
 
     private Builder CreateBuilder()
@@ -69,11 +71,13 @@ private Builder CreateBuilder()
                 return PipelineComponentFactory.WithExecutionTracking(innerComponent, timeProvider);
             },
             context.ReloadTokens,
-            telemetry);
+            telemetry,
+            builder);
     }
 
     private record Builder(
         Func<PipelineComponent> ComponentFactory,
         List<CancellationToken> ReloadTokens,
-        ResilienceStrategyTelemetry Telemetry);
+        ResilienceStrategyTelemetry Telemetry,
+        TBuilder Instance);
 }

src/Polly.Core/Registry/ResiliencePipelineRegistry.TResult.cs

@@ -51,14 +51,16 @@ public ResiliencePipeline<TResult> GetOrAdd(TKey key, Action<ResiliencePipelineB
 
             return _pipelines.GetOrAdd(key, k =>
             {
-                var component = new RegistryPipelineComponentBuilder<ResiliencePipelineBuilder<TResult>, TKey>(
+                var componentBuilder = new RegistryPipelineComponentBuilder<ResiliencePipelineBuilder<TResult>, TKey>(
                     _activator,
                     k,
                     _builderNameFormatter(k),
                     _instanceNameFormatter?.Invoke(k),
-                    configure).CreateComponent();
+                    configure);
 
-                return new ResiliencePipeline<TResult>(component, DisposeBehavior.Reject);
+                (var contextPool, var component) = componentBuilder.CreateComponent();
+
+                return new ResiliencePipeline<TResult>(component, DisposeBehavior.Reject, contextPool);
             });
         }
 

src/Polly.Core/Registry/ResiliencePipelineRegistry.cs

@@ -124,14 +124,17 @@ public ResiliencePipeline GetOrAddPipeline(TKey key, Action<ResiliencePipelineBu
 
         return _pipelines.GetOrAdd(key, k =>
         {
-            var component = new RegistryPipelineComponentBuilder<ResiliencePipelineBuilder, TKey>(
+            var componentBuilder = new RegistryPipelineComponentBuilder<ResiliencePipelineBuilder, TKey>(
                 _activator,
                 k,
                 _builderNameFormatter(k),
                 _instanceNameFormatter?.Invoke(k),
-                configure).CreateComponent();
+                configure)
+            ;
 
-            return new ResiliencePipeline(component, DisposeBehavior.Reject);
+            (var contextPool, var component) = componentBuilder.CreateComponent();
+
+            return new ResiliencePipeline(component, DisposeBehavior.Reject, contextPool);
         });
     }
 

src/Polly.Core/ResiliencePipeline.cs

@@ -14,15 +14,16 @@ public sealed partial class ResiliencePipeline
     /// <summary>
     /// Resilience pipeline that executes the user-provided callback without any additional logic.
     /// </summary>
-    public static readonly ResiliencePipeline Empty = new(PipelineComponent.Empty, DisposeBehavior.Ignore);
+    public static readonly ResiliencePipeline Empty = new(PipelineComponent.Empty, DisposeBehavior.Ignore, null);
 
-    internal ResiliencePipeline(PipelineComponent component, DisposeBehavior disposeBehavior)
+    internal ResiliencePipeline(PipelineComponent component, DisposeBehavior disposeBehavior, ResilienceContextPool? pool)
     {
         Component = component;
         DisposeHelper = new ComponentDisposeHelper(component, disposeBehavior);
+        Pool = pool ?? ResilienceContextPool.Shared;
     }
 
-    internal static ResilienceContextPool Pool => ResilienceContextPool.Shared;
+    internal ResilienceContextPool Pool { get; }
 
     internal PipelineComponent Component { get; }
 

src/Polly.Core/ResiliencePipelineBuilder.TResult.cs

@@ -30,5 +30,5 @@ internal ResiliencePipelineBuilder(ResiliencePipelineBuilderBase other)
     /// </summary>
     /// <returns>An instance of <see cref="ResiliencePipeline{TResult}"/>.</returns>
     /// <exception cref="ValidationException">Thrown when this builder has invalid configuration.</exception>
-    public ResiliencePipeline<TResult> Build() => new(BuildPipelineComponent(), DisposeBehavior.Allow);
+    public ResiliencePipeline<TResult> Build() => new(BuildPipelineComponent(), DisposeBehavior.Allow, ContextPool);
 }

src/Polly.Core/ResiliencePipelineBuilder.cs

@@ -17,5 +17,5 @@ public sealed class ResiliencePipelineBuilder : ResiliencePipelineBuilderBase
     /// </summary>
     /// <returns>An instance of <see cref="ResiliencePipeline"/>.</returns>
     /// <exception cref="ValidationException">Thrown when this builder has invalid configuration.</exception>
-    public ResiliencePipeline Build() => new(BuildPipelineComponent(), DisposeBehavior.Allow);
+    public ResiliencePipeline Build() => new(BuildPipelineComponent(), DisposeBehavior.Allow, ContextPool);
 }

src/Polly.Core/ResiliencePipelineBuilderBase.cs

@@ -55,7 +55,19 @@ private protected ResiliencePipelineBuilderBase(ResiliencePipelineBuilderBase ot
     public string? InstanceName { get; set; }
 
     /// <summary>
-    /// Gets or sets a <see cref="TimeProvider"/> that is used by strategies that work with time.
+    /// Gets or sets the <see cref="Polly.ResilienceContextPool"/> associated with the builder.
+    /// </summary>
+    /// <remarks>
+    /// A custom pool can be used to configure custom behavior for  creation.
+    /// This can include setting a default <c>continueOnCapturedContext</c> parameter or custom operation key resolution.
+    /// </remarks>
+    /// <value>
+    /// If the default value of <see langword="null"/> is used, <see cref="ResilienceContextPool.Shared"/> will be used.
+    /// </value>
+    public ResilienceContextPool? ContextPool { get; set; }
+
+    /// <summary>
+    /// Gets or sets a <see cref="System.TimeProvider"/> that is used by strategies that work with time.
     /// </summary>
     /// <remarks>
     /// This property is internal until we switch to official System.TimeProvider.
@@ -67,7 +79,7 @@ private protected ResiliencePipelineBuilderBase(ResiliencePipelineBuilderBase ot
     internal TimeProvider TimeProvider { get; set; } = TimeProvider.System;
 
     /// <summary>
-    /// Gets or sets the <see cref="TelemetryListener"/> that is used by Polly to report resilience events.
+    /// Gets or sets the <see cref="Polly.Telemetry.TelemetryListener"/> that is used by Polly to report resilience events.
     /// </summary>
     /// <remarks>
     /// This property is used by the telemetry infrastructure and should not be used directly by user code.

src/Polly.Core/ResiliencePipelineT.cs

@@ -15,14 +15,14 @@ public sealed partial class ResiliencePipeline<T>
     /// <summary>
     /// Resilience pipeline that executes the user-provided callback without any additional logic.
     /// </summary>
-    public static readonly ResiliencePipeline<T> Empty = new(PipelineComponent.Empty, DisposeBehavior.Ignore);
+    public static readonly ResiliencePipeline<T> Empty = new(PipelineComponent.Empty, DisposeBehavior.Ignore, null);
 
-    internal ResiliencePipeline(PipelineComponent component, DisposeBehavior disposeBehavior)
+    internal ResiliencePipeline(PipelineComponent component, DisposeBehavior disposeBehavior, ResilienceContextPool? pool)
     {
         // instead of re-implementing individual Execute* methods we
         // can just re-use the non-generic ResiliencePipeline and
         // call it from Execute* methods in this class
-        Pipeline = new ResiliencePipeline(component, disposeBehavior);
+        Pipeline = new ResiliencePipeline(component, disposeBehavior, pool);
         DisposeHelper = Pipeline.DisposeHelper;
     }
 

test/Polly.Core.Tests/ResiliencePipelineTTests.Async.cs

@@ -74,7 +74,7 @@ public async Task ExecuteAsync_GenericStrategy_Ok(Func<ResiliencePipeline<string
                 c.ResultType.Should().Be(typeof(string));
                 c.CancellationToken.CanBeCanceled.Should().BeTrue();
             },
-        }), DisposeBehavior.Allow);
+        }), DisposeBehavior.Allow, null);
 
         await execute(pipeline);
     }

test/Polly.Core.Tests/ResiliencePipelineTTests.Sync.cs

@@ -87,7 +87,7 @@ public void Execute_GenericStrategy_Ok(Action<ResiliencePipeline<string>> execut
                 c.IsSynchronous.Should().BeTrue();
                 c.ResultType.Should().Be(typeof(string));
             },
-        }), DisposeBehavior.Allow);
+        }), DisposeBehavior.Allow, null);
 
         execute(pipeline);
     }

test/Polly.Core.Tests/ResiliencePipelineTests.cs

@@ -32,7 +32,7 @@ public async Task DisposeAsync_NullGenericPipeline_OK()
     public async Task DisposeAsync_Reject_Throws()
     {
         var component = Substitute.For<PipelineComponent>();
-        var pipeline = new ResiliencePipeline(component, DisposeBehavior.Reject);
+        var pipeline = new ResiliencePipeline(component, DisposeBehavior.Reject, null);
 
         (await pipeline.Invoking(p => p.DisposeHelper.DisposeAsync().AsTask())
             .Should()
@@ -44,7 +44,7 @@ public async Task DisposeAsync_Reject_Throws()
     public async Task DisposeAsync_Allowed_Disposed()
     {
         var component = Substitute.For<PipelineComponent>();
-        var pipeline = new ResiliencePipeline(component, DisposeBehavior.Allow);
+        var pipeline = new ResiliencePipeline(component, DisposeBehavior.Allow, null);
         await pipeline.DisposeHelper.DisposeAsync();
         await pipeline.DisposeHelper.DisposeAsync();
 

test/Polly.Core.Tests/Utils/Pipeline/BridgePipelineComponentTests.cs

@@ -20,7 +20,7 @@ public void Execute_NonGeneric_Ok()
         var pipeline = new ResiliencePipeline(PipelineComponentFactory.FromStrategy(new Strategy<object>(outcome =>
         {
             values.Add(outcome.Result);
-        })), DisposeBehavior.Allow);
+        })), DisposeBehavior.Allow, null);
 
         pipeline.Execute(args => "dummy");
         pipeline.Execute(args => 0);
@@ -41,7 +41,7 @@ public void Execute_Generic_Ok()
         var pipeline = new ResiliencePipeline(PipelineComponentFactory.FromStrategy(new Strategy<string>(outcome =>
         {
             values.Add(outcome.Result);
-        })), DisposeBehavior.Allow);
+        })), DisposeBehavior.Allow, null);
 
         pipeline.Execute(args => "dummy");
 
@@ -58,7 +58,7 @@ public void Pipeline_TypeCheck_Ok()
         {
             outcome.Result.Should().Be(-1);
             called = true;
-        })), DisposeBehavior.Allow);
+        })), DisposeBehavior.Allow, null);
 
         pipeline.Execute(() => -1);
 

test/Polly.Core.Tests/Utils/Pipeline/CompositePipelineComponentTests.cs

@@ -86,7 +86,7 @@ public async Task Create_Cancelled_EnsureNoExecution()
             PipelineComponentFactory.FromStrategy(new TestResilienceStrategy()),
         };
 
-        var pipeline = new ResiliencePipeline(CreateSut(strategies, new FakeTimeProvider()), DisposeBehavior.Allow);
+        var pipeline = new ResiliencePipeline(CreateSut(strategies, new FakeTimeProvider()), DisposeBehavior.Allow, null);
         var context = ResilienceContextPool.Shared.Get();
         context.CancellationToken = cancellation.Token;
 
@@ -104,7 +104,7 @@ public async Task Create_CancelledLater_EnsureNoExecution()
             PipelineComponentFactory.FromStrategy(new TestResilienceStrategy { Before = (_, _) => { executed = true; cancellation.Cancel(); } }),
             PipelineComponentFactory.FromStrategy(new TestResilienceStrategy()),
         };
-        var pipeline = new ResiliencePipeline(CreateSut(strategies, new FakeTimeProvider()), DisposeBehavior.Allow);
+        var pipeline = new ResiliencePipeline(CreateSut(strategies, new FakeTimeProvider()), DisposeBehavior.Allow, null);
         var context = ResilienceContextPool.Shared.Get();
         context.CancellationToken = cancellation.Token;
 
@@ -118,7 +118,7 @@ public void ExecutePipeline_EnsureTelemetryArgumentsReported()
     {
         var timeProvider = new FakeTimeProvider();
 
-        var pipeline = new ResiliencePipeline(CreateSut(new[] { Substitute.For<PipelineComponent>() }, timeProvider), DisposeBehavior.Allow);
+        var pipeline = new ResiliencePipeline(CreateSut(new[] { Substitute.For<PipelineComponent>() }, timeProvider), DisposeBehavior.Allow, null);
         pipeline.Execute(() => { timeProvider.Advance(TimeSpan.FromHours(1)); });
 
         _listener.Events.Should().HaveCount(2);

test/Polly.Core.Tests/Utils/Pipeline/ExecutionTrackingComponentTests.cs

@@ -1,6 +1,4 @@
-using System;
-using System.Threading.Tasks;
-using Microsoft.Extensions.Time.Testing;
+using Microsoft.Extensions.Time.Testing;
 using Polly.Utils.Pipeline;
 
 namespace Polly.Core.Tests.Utils.Pipeline;
@@ -25,7 +23,7 @@ public async Task DisposeAsync_PendingOperations_Delayed()
         };
 
         var component = new ExecutionTrackingComponent(inner, _timeProvider);
-        var execution = Task.Run(() => new ResiliencePipeline(component, Polly.Utils.DisposeBehavior.Allow).Execute(() => { }));
+        var execution = Task.Run(() => new ResiliencePipeline(component, Polly.Utils.DisposeBehavior.Allow, null).Execute(() => { }));
         executing.WaitOne();
 
         var disposeTask = component.DisposeAsync().AsTask();
@@ -58,7 +56,7 @@ public async Task HasPendingExecutions_Ok()
         };
 
         await using var component = new ExecutionTrackingComponent(inner, _timeProvider);
-        var execution = Task.Run(() => new ResiliencePipeline(component, Polly.Utils.DisposeBehavior.Allow).Execute(() => { }));
+        var execution = Task.Run(() => new ResiliencePipeline(component, Polly.Utils.DisposeBehavior.Allow, null).Execute(() => { }));
         executing.WaitOne();
 
         component.HasPendingExecutions.Should().BeTrue();
@@ -84,7 +82,7 @@ public async Task DisposeAsync_Timeout_Ok()
         };
 
         var component = new ExecutionTrackingComponent(inner, _timeProvider);
-        var execution = Task.Run(() => new ResiliencePipeline(component, Polly.Utils.DisposeBehavior.Allow).Execute(() => { }));
+        var execution = Task.Run(() => new ResiliencePipeline(component, Polly.Utils.DisposeBehavior.Allow, null).Execute(() => { }));
         executing.WaitOne();
 
         var disposeTask = component.DisposeAsync().AsTask();
@@ -115,7 +113,7 @@ public async Task DisposeAsync_WhenRunningMultipleTasks_Ok()
         };
 
         var component = new ExecutionTrackingComponent(inner, TimeProvider.System);
-        var pipeline = new ResiliencePipeline(component, Polly.Utils.DisposeBehavior.Allow);
+        var pipeline = new ResiliencePipeline(component, Polly.Utils.DisposeBehavior.Allow, null);
 
         for (int i = 0; i < 10; i++)
         {

test/Polly.Extensions.Tests/Issues/IssuesTests.DynamicContextPool_1687.cs

@@ -0,0 +1,67 @@
+using Microsoft.Extensions.DependencyInjection;
+using Polly.Registry;
+
+namespace Polly.Extensions.Tests.Issues;
+
+public partial class IssuesTests
+{
+    private class CustomResilienceContextPool : ResilienceContextPool
+    {
+        public override ResilienceContext Get(ResilienceContextCreationArguments arguments)
+        {
+            if (arguments.ContinueOnCapturedContext is null)
+            {
+                arguments = new ResilienceContextCreationArguments(arguments.OperationKey, continueOnCapturedContext: true, arguments.CancellationToken);
+            }
+
+            return Shared.Get(arguments);
+        }
+
+        public override void Return(ResilienceContext context) => Shared.Return(context);
+    }
+
+    private class ContextCreationTestStrategy : ResilienceStrategy
+    {
+        public int HitCount { get; private set; }
+
+        protected override async ValueTask<Outcome<TResult>> ExecuteCore<TResult, TState>(Func<ResilienceContext, TState, ValueTask<Outcome<TResult>>> callback,
+            ResilienceContext context,
+            TState state)
+        {
+            context.ContinueOnCapturedContext.Should().BeTrue();
+
+            HitCount++;
+
+            return await callback(context, state);
+        }
+    }
+
+    [Fact]
+    public async Task DynamicContextPool_1687()
+    {
+        var pool = new CustomResilienceContextPool();
+        var strategy = new ContextCreationTestStrategy();
+        var services = new ServiceCollection();
+        string key = "my-key";
+
+        services.AddResiliencePipelineRegistry<string>(options => options.BuilderFactory = () => new ResiliencePipelineBuilder
+        {
+            ContextPool = pool,
+        });
+
+        services.AddResiliencePipeline(key, builder =>
+        {
+            builder.ContextPool.Should().Be(pool);
+            builder.AddStrategy(strategy);
+        });
+
+        // create the pipeline provider
+        var provider = services.BuildServiceProvider().GetRequiredService<ResiliencePipelineProvider<string>>();
+
+        var pipeline = provider.GetPipeline(key);
+
+        await pipeline.ExecuteAsync(async ct => await default(ValueTask));
+
+        strategy.HitCount.Should().BeGreaterThan(0);
+    }
+}