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KernelSchedulerTests.cs
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KernelSchedulerTests.cs
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// Copyright (c) .NET Foundation and contributors. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using FluentAssertions;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.DotNet.Interactive.Tests.Utility;
using Microsoft.DotNet.Interactive.Utility;
using Pocket;
using Xunit;
using Xunit.Abstractions;
using static Pocket.Logger<Microsoft.DotNet.Interactive.Tests.KernelSchedulerTests>;
namespace Microsoft.DotNet.Interactive.Tests
{
public class KernelSchedulerTests : IDisposable
{
private readonly CompositeDisposable _disposables = new();
public KernelSchedulerTests(ITestOutputHelper output)
{
DisposeAfterTest(output.SubscribeToPocketLogger());
}
public void Dispose()
{
try
{
_disposables?.Dispose();
}
catch (Exception ex)
{
Log.Error(exception: ex);
}
}
private void DisposeAfterTest(IDisposable disposable)
{
_disposables.Add(disposable);
}
[Fact]
public async Task scheduled_work_is_completed_in_order()
{
using var scheduler = new KernelScheduler<int, int>();
var executionList = new List<int>();
await scheduler.RunAsync(1, PerformWork);
await scheduler.RunAsync(2, PerformWork);
await scheduler.RunAsync(3, PerformWork);
executionList.Should().BeEquivalentSequenceTo(1, 2, 3);
Task<int> PerformWork(int v)
{
executionList.Add(v);
return Task.FromResult(v);
}
}
[Fact]
public async Task scheduled_work_does_not_execute_in_parallel()
{
using var scheduler = new KernelScheduler<int, int>();
var concurrencyCounter = 0;
var maxObservedParallelism = 0;
var tasks = Enumerable.Range(1, 3).Select(i =>
{
return scheduler.RunAsync(i, async v =>
{
Interlocked.Increment(ref concurrencyCounter);
await Task.Delay(100);
maxObservedParallelism = Math.Max(concurrencyCounter, maxObservedParallelism);
Interlocked.Decrement(ref concurrencyCounter);
return v;
});
});
await Task.WhenAll(tasks);
maxObservedParallelism.Should().Be(1);
}
[Fact]
public async Task deferred_work_is_executed_before_new_work()
{
var executionList = new List<int>();
Task<int> PerformWork(int v)
{
executionList.Add(v);
return Task.FromResult(v);
}
using var scheduler = new KernelScheduler<int, int>();
scheduler.RegisterDeferredOperationSource(
(v, _) => Enumerable.Repeat(v * 10, v).ToList(), PerformWork);
for (var i = 1; i <= 3; i++)
{
await scheduler.RunAsync(i, PerformWork);
}
executionList.Should().BeEquivalentSequenceTo(10, 1, 20, 20, 2, 30, 30, 30, 3);
}
[Fact]
public void disposing_scheduler_prevents_later_scheduled_work_from_executing()
{
using var scheduler = new KernelScheduler<int, int>();
var barrier = new Barrier(2);
var laterWorkWasExecuted = false;
var t1 = scheduler.RunAsync(1, async v =>
{
barrier.SignalAndWait();
await Task.Delay(3000);
return v;
});
var t2 = scheduler.RunAsync(2, v =>
{
laterWorkWasExecuted = true;
return Task.FromResult(v);
});
barrier.SignalAndWait();
scheduler.Dispose();
t2.Status.Should().Be(TaskStatus.WaitingForActivation);
laterWorkWasExecuted.Should().BeFalse();
}
[Fact]
public void cancelling_work_in_progress_prevents_subsequent_work_scheduled_before_cancellation_from_executing()
{
using var scheduler = new KernelScheduler<int, int>();
var cts = new CancellationTokenSource();
var barrier = new Barrier(2);
var laterWorkWasExecuted = false;
// schedule work to be cancelled
var _ = scheduler.RunAsync(1, async v =>
{
barrier.SignalAndWait();
await Task.Delay(1000);
return v;
}, cancellationToken: cts.Token);
// schedule more work prior to cancellation
var laterWork = scheduler.RunAsync(2, v =>
{
laterWorkWasExecuted = true;
return Task.FromResult(v);
});
barrier.SignalAndWait();
cts.Cancel();
laterWork.Status.Should().Be(TaskStatus.WaitingForActivation);
laterWorkWasExecuted.Should().BeFalse();
}
[Fact]
public void work_in_progress_can_be_cancelled_without_holding_reference_to_the_CancellationToken_used_to_schedule_it()
{
using var scheduler = new KernelScheduler<int, int>();
var barrier = new Barrier(2);
var cts = new CancellationTokenSource();
var task = scheduler.RunAsync(1, async v =>
{
barrier.SignalAndWait(5000);
await Task.Delay(1000);
return v;
}, cancellationToken: cts.Token);
barrier.SignalAndWait(5000);
scheduler.CancelCurrentOperation();
task.IsCanceled.Should().BeTrue();
}
[Fact]
public void cancelling_work_in_progress_throws_exception()
{
using var scheduler = new KernelScheduler<int, int>();
var cts = new CancellationTokenSource();
var barrier = new Barrier(2);
var work = scheduler.RunAsync(1, async v =>
{
barrier.SignalAndWait();
await Task.Delay(3000);
return v;
}, cancellationToken: cts.Token);
barrier.SignalAndWait();
cts.Cancel();
work.Invoking(async w => await w)
.Should()
.Throw<OperationCanceledException>();
}
[Fact]
public void disposing_scheduler_throws_exception()
{
using var scheduler = new KernelScheduler<int, int>();
var barrier = new Barrier(2);
var work = scheduler.RunAsync(1, async v =>
{
barrier.SignalAndWait();
await Task.Delay(3000);
return v;
});
barrier.SignalAndWait();
scheduler.Dispose();
work.Invoking(async w => await w)
.Should()
.Throw<OperationCanceledException>();
}
[Fact]
public async Task exception_in_scheduled_work_does_not_prevent_execution_of_work_already_queued()
{
using var scheduler = new KernelScheduler<int, int>();
var barrier = new Barrier(2);
var laterWorkWasExecuted = false;
var t1 = scheduler.RunAsync(1, _ =>
{
barrier.SignalAndWait();
throw new DataMisalignedException();
});
var t2 = scheduler.RunAsync(2, v =>
{
laterWorkWasExecuted = true;
return Task.FromResult(v);
});
barrier.SignalAndWait();
await t2;
laterWorkWasExecuted.Should().BeTrue();
}
[Fact]
public async Task after_an_exception_in_scheduled_work_more_work_can_be_scheduled()
{
using var scheduler = new KernelScheduler<int, int>();
try
{
await scheduler.RunAsync(1, _ => throw new DataMisalignedException());
}
catch (DataMisalignedException)
{
}
var next = await scheduler.RunAsync(2, _ => Task.FromResult(2));
next.Should().Be(2);
}
[Fact]
public void exception_in_scheduled_work_is_propagated()
{
using var scheduler = new KernelScheduler<int, int>();
var barrier = new Barrier(2);
Task<int> Throw(int v)
{
barrier.SignalAndWait();
throw new DataMisalignedException();
}
var work = scheduler.RunAsync(1, Throw);
barrier.SignalAndWait();
work.Invoking(async w => await w)
.Should()
.Throw<DataMisalignedException>();
}
[Fact]
public async Task awaiting_for_work_to_complete_does_not_wait_for_subsequent_work()
{
var executionList = new List<int>();
using var scheduler = new KernelScheduler<int, int>();
async Task<int> PerformWorkAsync(int v)
{
await Task.Delay(200);
executionList.Add(v);
return v;
}
var one = scheduler.RunAsync(1, PerformWorkAsync);
var two = scheduler.RunAsync(2, PerformWorkAsync);
var three = scheduler.RunAsync(3, PerformWorkAsync);
await two;
executionList.Should().BeEquivalentSequenceTo(1, 2);
}
[Fact]
public async Task deferred_work_is_done_based_on_the_scope_of_scheduled_work()
{
var executionList = new List<int>();
Task<int> PerformWork(int v)
{
executionList.Add(v);
return Task.FromResult(v);
}
using var scheduler = new KernelScheduler<int, int>();
scheduler.RegisterDeferredOperationSource(
(v, scope) => scope == "scope2" ? Enumerable.Repeat(v * 10, v).ToList() : Enumerable.Empty<int>().ToList(), PerformWork);
for (var i = 1; i <= 3; i++)
{
await scheduler.RunAsync(i, PerformWork, $"scope{i}");
}
executionList.Should().BeEquivalentSequenceTo(1, 20, 20, 2, 3);
}
[Fact]
public async Task work_can_be_scheduled_from_within_scheduled_work()
{
var executionList = new List<string>();
using var scheduler = new KernelScheduler<string, string>();
await scheduler.RunAsync("outer", async _ =>
{
executionList.Add("outer 1");
await scheduler.RunAsync("inner", async _ =>
{
executionList.Add("inner 1");
await Task.Yield();
executionList.Add("inner 2");
return default;
});
executionList.Add("outer 2");
return default;
});
executionList.Should()
.BeEquivalentSequenceTo(
"outer 1",
"inner 1",
"inner 2",
"outer 2"
);
}
[Fact]
public async Task concurrent_schedulers_do_not_interfere_with_one_another()
{
var participantCount = 5;
var barrier = new Barrier(participantCount);
var schedulers = Enumerable.Range(0, participantCount)
.Select(_ => new KernelScheduler<int, int>());
var tasks = schedulers.Select((s, i) => s.RunAsync(i, async value =>
{
await Task.Yield();
barrier.SignalAndWait();
return value;
}
));
var xs = await Task.WhenAll(tasks);
xs.Should().BeEquivalentTo(0, 1, 2, 3, 4);
}
[Fact]
public async Task AsyncContext_is_maintained_across_async_operations_within_scheduled_work()
{
using var scheduler = new KernelScheduler<int, int>();
int asyncId1 = default;
int asyncId2 = default;
await scheduler.RunAsync(0, async value =>
{
AsyncContext.TryEstablish(out asyncId1);
await Task.Yield();
AsyncContext.TryEstablish(out asyncId2);
return value;
});
asyncId2.Should().Be(asyncId1);
}
[Fact]
public async Task AsyncContext_is_maintained_across_from_outside_context_to_scheduled_work()
{
using var scheduler = new KernelScheduler<int, int>();
int asyncId1 = default;
int asyncId2 = default;
AsyncContext.TryEstablish(out asyncId1);
await scheduler.RunAsync(0, async value =>
{
await Task.Yield();
AsyncContext.TryEstablish(out asyncId2);
return value;
});
asyncId2.Should().Be(asyncId1);
}
[Fact]
public async Task AsyncContext_does_not_leak_from_inner_context()
{
using var scheduler = new KernelScheduler<int, int>();
int asyncId = default;
await scheduler.RunAsync(0, async value =>
{
await Task.Yield();
AsyncContext.TryEstablish(out asyncId);
return value;
});
AsyncContext.Id.Should().NotBe(asyncId);
}
[Fact]
public async Task AsyncContext_does_not_leak_between_scheduled_work()
{
using var scheduler = new KernelScheduler<int, int>();
int asyncId1 = default;
int asyncId2 = default;
await scheduler.RunAsync(1, async value =>
{
AsyncContext.TryEstablish(out asyncId1);
await Task.Yield();
return value;
});
await scheduler.RunAsync(2, async value =>
{
AsyncContext.TryEstablish(out asyncId2);
await Task.Yield();
return value;
});
asyncId2.Should().NotBe(asyncId1);
}
[Fact]
public async Task AsyncContext_flows_from_scheduled_work_to_deferred_work()
{
using var scheduler = new KernelScheduler<int, int>();
int asyncIdForScheduledWork = default;
var asyncIdsForDeferredWork = new ConcurrentBag<int>();
AsyncContext.TryEstablish(out var _);
scheduler.RegisterDeferredOperationSource((execute, name) =>
{
return new[] {0,1,2};
}, async value =>
{
AsyncContext.TryEstablish(out var asyncId);
asyncIdsForDeferredWork.Add( asyncId );
await Task.Yield();
return value;
});
await scheduler.RunAsync(3, async value =>
{
AsyncContext.TryEstablish(out asyncIdForScheduledWork);
await Task.Yield();
return value;
});
asyncIdsForDeferredWork.Should()
.HaveCount(3)
.And
.AllBeEquivalentTo(asyncIdForScheduledWork);
}
}
}