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Improve the V7 -> V8 bridge implementation (#1257)
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martintmk authored Jun 6, 2023
1 parent b0a6a38 commit 4141081
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Original file line number Diff line number Diff line change
@@ -0,0 +1,15 @@
``` ini

BenchmarkDotNet=v0.13.5, OS=Windows 11 (10.0.22621.1702/22H2/2022Update/SunValley2), VM=Hyper-V
Intel Xeon Platinum 8370C CPU 2.80GHz, 1 CPU, 16 logical and 8 physical cores
.NET SDK=7.0.302
[Host] : .NET 7.0.5 (7.0.523.17405), X64 RyuJIT AVX2

Job=MediumRun Toolchain=InProcessEmitToolchain IterationCount=15
LaunchCount=2 WarmupCount=10

```
| Method | Mean | Error | StdDev | Ratio | RatioSD | Gen0 | Allocated | Alloc Ratio |
|----------------------- |----------:|---------:|---------:|------:|--------:|-------:|----------:|------------:|
| NoOpAsync | 85.38 ns | 1.001 ns | 1.371 ns | 1.00 | 0.00 | 0.0120 | 304 B | 1.00 |
| NullResilienceStrategy | 416.38 ns | 1.924 ns | 2.820 ns | 4.87 | 0.10 | 0.0148 | 376 B | 1.24 |
22 changes: 22 additions & 0 deletions src/Polly.Core.Benchmarks/BridgeBenchmark.cs
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@@ -0,0 +1,22 @@
using BenchmarkDotNet.Attributes;

namespace Polly.Core.Benchmarks;

public class BridgeBenchmark
{
private IAsyncPolicy<string>? _policy;
private IAsyncPolicy<string>? _policyWrapped;

[GlobalSetup]
public void Setup()
{
_policy = Policy.NoOpAsync<string>();
_policyWrapped = NullResilienceStrategy<string>.Instance.AsAsyncPolicy();
}

[Benchmark(Baseline = true)]
public Task NoOpAsync() => _policy!.ExecuteAsync(() => Task.FromResult("dummy"));

[Benchmark]
public Task NullResilienceStrategy() => _policyWrapped!.ExecuteAsync(() => Task.FromResult("dummy"));
}
20 changes: 20 additions & 0 deletions src/Polly.Core.Tests/Utils/LegacySupportTests.cs
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@@ -0,0 +1,20 @@
using System.Collections.Generic;
using Polly.Utils;

namespace Polly.Core.Tests.Utils;

public class LegacySupportTests
{
[Fact]
public void SetProperties_Ok()
{
var resilienceProperties = new ResilienceProperties();
var oldProps = resilienceProperties.Options;
var newProps = new Dictionary<string, object?>();

resilienceProperties.SetProperties(newProps, out var oldProperties2);

resilienceProperties.Options.Should().BeSameAs(newProps);
oldProperties2.Should().BeSameAs(oldProps);
}
}
12 changes: 6 additions & 6 deletions src/Polly.Core/ResilienceProperties.cs
Original file line number Diff line number Diff line change
Expand Up @@ -9,7 +9,7 @@ namespace Polly;
/// </summary>
public sealed class ResilienceProperties : IDictionary<string, object?>
{
private Dictionary<string, object?> Options { get; } = new();
internal IDictionary<string, object?> Options { get; set; } = new Dictionary<string, object?>();

/// <summary>
/// Gets the value of a given property.
Expand Down Expand Up @@ -87,26 +87,26 @@ internal void Replace(ResilienceProperties other)
int ICollection<KeyValuePair<string, object?>>.Count => Options.Count;

/// <inheritdoc/>
bool ICollection<KeyValuePair<string, object?>>.IsReadOnly => ((IDictionary<string, object?>)Options).IsReadOnly;
bool ICollection<KeyValuePair<string, object?>>.IsReadOnly => Options.IsReadOnly;

/// <inheritdoc/>
void IDictionary<string, object?>.Add(string key, object? value) => Options.Add(key, value);

/// <inheritdoc/>
void ICollection<KeyValuePair<string, object?>>.Add(KeyValuePair<string, object?> item) => ((IDictionary<string, object?>)Options).Add(item);
void ICollection<KeyValuePair<string, object?>>.Add(KeyValuePair<string, object?> item) => Options.Add(item);

/// <inheritdoc/>
void ICollection<KeyValuePair<string, object?>>.Clear() => Options.Clear();

/// <inheritdoc/>
bool ICollection<KeyValuePair<string, object?>>.Contains(KeyValuePair<string, object?> item) => ((IDictionary<string, object?>)Options).Contains(item);
bool ICollection<KeyValuePair<string, object?>>.Contains(KeyValuePair<string, object?> item) => Options.Contains(item);

/// <inheritdoc/>
bool IDictionary<string, object?>.ContainsKey(string key) => Options.ContainsKey(key);

/// <inheritdoc/>
void ICollection<KeyValuePair<string, object?>>.CopyTo(KeyValuePair<string, object?>[] array, int arrayIndex) =>
((IDictionary<string, object?>)Options).CopyTo(array, arrayIndex);
Options.CopyTo(array, arrayIndex);

/// <inheritdoc/>
IEnumerator<KeyValuePair<string, object?>> IEnumerable<KeyValuePair<string, object?>>.GetEnumerator() => Options.GetEnumerator();
Expand All @@ -118,7 +118,7 @@ internal void Replace(ResilienceProperties other)
bool IDictionary<string, object?>.Remove(string key) => Options.Remove(key);

/// <inheritdoc/>
bool ICollection<KeyValuePair<string, object?>>.Remove(KeyValuePair<string, object?> item) => ((IDictionary<string, object?>)Options).Remove(item);
bool ICollection<KeyValuePair<string, object?>>.Remove(KeyValuePair<string, object?> item) => Options.Remove(item);

/// <inheritdoc/>
bool IDictionary<string, object?>.TryGetValue(string key, out object? value) => Options.TryGetValue(key, out value);
Expand Down
35 changes: 35 additions & 0 deletions src/Polly.Core/Utils/LegacySupport.cs
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@@ -0,0 +1,35 @@
using System.ComponentModel;

namespace Polly.Utils;

/// <summary>
/// Legacy support for older versions of Polly.
/// </summary>
/// <remarks>
/// This class is used by the legacy Polly infrastructure and should not be used directly by user code.
/// </remarks>
[EditorBrowsable(EditorBrowsableState.Never)]
public static class LegacySupport
{
/// <summary>
/// Changes the underlying properties of a <see cref="ResilienceProperties"/> instance.
/// </summary>
/// <param name="resilienceProperties">The resilience properties.</param>
/// <param name="properties">The properties to use.</param>
/// <param name="oldProperties">The old properties used by <paramref name="resilienceProperties"/>.</param>
/// <remarks>
/// This method is used by the legacy Polly infrastructure and should not be used directly by user code.
/// </remarks>
[EditorBrowsable(EditorBrowsableState.Never)]
public static void SetProperties(
this ResilienceProperties resilienceProperties,
IDictionary<string, object?> properties,
out IDictionary<string, object?> oldProperties)
{
Guard.NotNull(resilienceProperties);
Guard.NotNull(properties);

oldProperties = resilienceProperties.Options;
resilienceProperties.Options = properties;
}
}
14 changes: 9 additions & 5 deletions src/Polly.Specs/ResilienceStrategyConversionExtensionsTests.cs
Original file line number Diff line number Diff line change
@@ -1,5 +1,6 @@
using Polly.Strategy;
using Polly.TestUtils;
using Polly.Utilities.Wrappers;

namespace Polly.Specs;

Expand Down Expand Up @@ -167,17 +168,20 @@ public void RetryStrategy_AsSyncPolicy_Ok()
.Build()
.AsSyncPolicy();

var tries = 0;
var context = new Context();
context["retry"] = 0;

policy.Execute(
() =>
c =>
{
tries++;
c["retry"] = (int)c["retry"] + 1;
return "dummy";
})
},
context)
.Should()
.Be("dummy");

tries.Should().Be(6);
context["retry"].Should().Be(6);
}

private static void AssertContext(Context context)
Expand Down
38 changes: 11 additions & 27 deletions src/Polly/Utilities/Wrappers/ResilienceContextFactory.cs
Original file line number Diff line number Diff line change
@@ -1,42 +1,26 @@
using Polly.Utils;

namespace Polly.Utilities.Wrappers;

internal static class ResilienceContextFactory
{
public static readonly ResiliencePropertyKey<Context> ContextKey = new("Polly.Legacy.Context");

public static ResilienceContext Create(Context context, CancellationToken cancellationToken, bool continueOnCapturedContext)
public static ResilienceContext Create(
Context context,
CancellationToken cancellationToken,
bool continueOnCapturedContext,
out IDictionary<string, object> oldProperties)
{
var resilienceContext = ResilienceContext.Get();
resilienceContext.CancellationToken = cancellationToken;
resilienceContext.ContinueOnCapturedContext = continueOnCapturedContext;

foreach (var pair in context)
{
var props = (IDictionary<string, object>)resilienceContext.Properties;
props.Add(pair.Key, pair.Value);
}

resilienceContext.Properties.Set(ContextKey, context);
resilienceContext.Properties.SetProperties(context, out oldProperties);

return resilienceContext;
}

public static void Restore(ResilienceContext context)
public static void Cleanup(ResilienceContext resilienceContext, IDictionary<string, object> oldProperties)
{
var originalContext = context.GetContext();

foreach (var pair in context.Properties)
{
if (pair.Key == ContextKey.Key)
{
continue;
}

originalContext[pair.Key] = pair.Value;
}

ResilienceContext.Return(context);
resilienceContext.Properties.SetProperties(oldProperties, out _);
ResilienceContext.Return(resilienceContext);
}

public static Context GetContext(this ResilienceContext resilienceContext) => resilienceContext.Properties.GetValue(ContextKey, null!);
}
Original file line number Diff line number Diff line change
Expand Up @@ -8,21 +8,25 @@ internal sealed class ResilienceStrategyAsyncPolicy<TResult> : AsyncPolicy<TResu

protected sealed override async Task<TResult> ImplementationAsync(Func<Context, CancellationToken, Task<TResult>> action, Context context, CancellationToken cancellationToken, bool continueOnCapturedContext)
{
var resilienceContext = ResilienceContextFactory.Create(context, cancellationToken, continueOnCapturedContext);
var resilienceContext = ResilienceContextFactory.Create(
context,
cancellationToken,
continueOnCapturedContext,
out var oldProperties);

try
{
return await _strategy.ExecuteAsync(
static async (context, state) =>
static async (resilienceContext, state) =>
{
return await state(context.GetContext(), context.CancellationToken).ConfigureAwait(context.ContinueOnCapturedContext);
return await state.action(state.context, resilienceContext.CancellationToken).ConfigureAwait(resilienceContext.ContinueOnCapturedContext);
},
resilienceContext,
action).ConfigureAwait(continueOnCapturedContext);
(action, context)).ConfigureAwait(continueOnCapturedContext);
}
finally
{
ResilienceContextFactory.Restore(resilienceContext);
ResilienceContextFactory.Cleanup(resilienceContext, oldProperties);
}
}
}
28 changes: 18 additions & 10 deletions src/Polly/Utilities/Wrappers/ResilienceStrategyAsyncPolicy.cs
Original file line number Diff line number Diff line change
Expand Up @@ -12,21 +12,25 @@ protected sealed override async Task ImplementationAsync(
CancellationToken cancellationToken,
bool continueOnCapturedContext)
{
var resilienceContext = ResilienceContextFactory.Create(context, cancellationToken, continueOnCapturedContext);
var resilienceContext = ResilienceContextFactory.Create(
context,
cancellationToken,
continueOnCapturedContext,
out var oldProperties);

try
{
await _strategy.ExecuteAsync(
static async (context, state) =>
static async (resilienceContext, state) =>
{
await state(context.GetContext(), context.CancellationToken).ConfigureAwait(context.ContinueOnCapturedContext);
await state.action(state.context, resilienceContext.CancellationToken).ConfigureAwait(resilienceContext.ContinueOnCapturedContext);
},
resilienceContext,
action).ConfigureAwait(continueOnCapturedContext);
(action, context)).ConfigureAwait(continueOnCapturedContext);
}
finally
{
ResilienceContextFactory.Restore(resilienceContext);
ResilienceContextFactory.Cleanup(resilienceContext, oldProperties);
}
}

Expand All @@ -36,21 +40,25 @@ protected override async Task<TResult> ImplementationAsync<TResult>(
CancellationToken cancellationToken,
bool continueOnCapturedContext)
{
var resilienceContext = ResilienceContextFactory.Create(context, cancellationToken, continueOnCapturedContext);
var resilienceContext = ResilienceContextFactory.Create(
context,
cancellationToken,
continueOnCapturedContext,
out var oldProperties);

try
{
return await _strategy.ExecuteAsync(
static async (context, state) =>
static async (resilienceContext, state) =>
{
return await state(context.GetContext(), context.CancellationToken).ConfigureAwait(context.ContinueOnCapturedContext);
return await state.action(state.context, resilienceContext.CancellationToken).ConfigureAwait(resilienceContext.ContinueOnCapturedContext);
},
resilienceContext,
action).ConfigureAwait(continueOnCapturedContext);
(action, context)).ConfigureAwait(continueOnCapturedContext);
}
finally
{
ResilienceContextFactory.Restore(resilienceContext);
ResilienceContextFactory.Cleanup(resilienceContext, oldProperties);
}
}
}
Original file line number Diff line number Diff line change
Expand Up @@ -8,21 +8,25 @@ internal sealed class ResilienceStrategySyncPolicy<TResult> : Policy<TResult>

protected sealed override TResult Implementation(Func<Context, CancellationToken, TResult> action, Context context, CancellationToken cancellationToken)
{
var resilienceContext = ResilienceContextFactory.Create(context, cancellationToken, true);
var resilienceContext = ResilienceContextFactory.Create(
context,
cancellationToken,
true,
out var oldProperties);

try
{
return _strategy.Execute(
static (context, state) =>
{
return state(context.GetContext(), context.CancellationToken);
return state.action(state.context, context.CancellationToken);
},
resilienceContext,
action);
(action, context));
}
finally
{
ResilienceContextFactory.Restore(resilienceContext);
ResilienceContextFactory.Cleanup(resilienceContext, oldProperties);
}
}
}
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