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更新Demo

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更新Demo
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ALEXTANG
2023-12-20 12:14:27 +08:00
parent f64bb37706
commit 17a5d7425c
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173
UnityProject/Packages/UniTask/Runtime/Linq/SkipUntilCanceled.cs Normal file
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using Cysharp.Threading.Tasks.Internal;
using System;
using System.Threading;
namespace Cysharp.Threading.Tasks.Linq
{
public static partial class UniTaskAsyncEnumerable
{
public static IUniTaskAsyncEnumerable<TSource> SkipUntilCanceled<TSource>(this IUniTaskAsyncEnumerable<TSource> source, CancellationToken cancellationToken)
{
Error.ThrowArgumentNullException(source, nameof(source));
return new SkipUntilCanceled<TSource>(source, cancellationToken);
}
}
internal sealed class SkipUntilCanceled<TSource> : IUniTaskAsyncEnumerable<TSource>
{
readonly IUniTaskAsyncEnumerable<TSource> source;
readonly CancellationToken cancellationToken;
public SkipUntilCanceled(IUniTaskAsyncEnumerable<TSource> source, CancellationToken cancellationToken)
{
this.source = source;
this.cancellationToken = cancellationToken;
}
public IUniTaskAsyncEnumerator<TSource> GetAsyncEnumerator(CancellationToken cancellationToken = default)
{
return new _SkipUntilCanceled(source, this.cancellationToken, cancellationToken);
}
sealed class _SkipUntilCanceled : MoveNextSource, IUniTaskAsyncEnumerator<TSource>
{
static readonly Action<object> CancelDelegate1 = OnCanceled1;
static readonly Action<object> CancelDelegate2 = OnCanceled2;
static readonly Action<object> MoveNextCoreDelegate = MoveNextCore;
readonly IUniTaskAsyncEnumerable<TSource> source;
CancellationToken cancellationToken1;
CancellationToken cancellationToken2;
CancellationTokenRegistration cancellationTokenRegistration1;
CancellationTokenRegistration cancellationTokenRegistration2;
int isCanceled;
IUniTaskAsyncEnumerator<TSource> enumerator;
UniTask<bool>.Awaiter awaiter;
bool continueNext;
public _SkipUntilCanceled(IUniTaskAsyncEnumerable<TSource> source, CancellationToken cancellationToken1, CancellationToken cancellationToken2)
{
this.source = source;
this.cancellationToken1 = cancellationToken1;
this.cancellationToken2 = cancellationToken2;
if (cancellationToken1.CanBeCanceled)
{
this.cancellationTokenRegistration1 = cancellationToken1.RegisterWithoutCaptureExecutionContext(CancelDelegate1, this);
}
if (cancellationToken1 != cancellationToken2 && cancellationToken2.CanBeCanceled)
{
this.cancellationTokenRegistration2 = cancellationToken2.RegisterWithoutCaptureExecutionContext(CancelDelegate2, this);
}
TaskTracker.TrackActiveTask(this, 3);
}
public TSource Current { get; private set; }
public UniTask<bool> MoveNextAsync()
{
if (enumerator == null)
{
if (cancellationToken1.IsCancellationRequested) isCanceled = 1;
if (cancellationToken2.IsCancellationRequested) isCanceled = 1;
enumerator = source.GetAsyncEnumerator(cancellationToken2); // use only AsyncEnumerator provided token.
}
completionSource.Reset();
if (isCanceled != 0)
{
SourceMoveNext();
}
return new UniTask<bool>(this, completionSource.Version);
}
void SourceMoveNext()
{
try
{
LOOP:
awaiter = enumerator.MoveNextAsync().GetAwaiter();
if (awaiter.IsCompleted)
{
continueNext = true;
MoveNextCore(this);
if (continueNext)
{
continueNext = false;
goto LOOP;
}
}
else
{
awaiter.SourceOnCompleted(MoveNextCoreDelegate, this);
}
}
catch (Exception ex)
{
completionSource.TrySetException(ex);
}
}
static void MoveNextCore(object state)
{
var self = (_SkipUntilCanceled)state;
if (self.TryGetResult(self.awaiter, out var result))
{
if (result)
{
self.Current = self.enumerator.Current;
self.completionSource.TrySetResult(true);
if (self.continueNext)
{
self.SourceMoveNext();
}
}
else
{
self.completionSource.TrySetResult(false);
}
}
}
static void OnCanceled1(object state)
{
var self = (_SkipUntilCanceled)state;
if (self.isCanceled == 0)
{
if (Interlocked.Increment(ref self.isCanceled) == 1)
{
self.cancellationTokenRegistration2.Dispose();
self.SourceMoveNext();
}
}
}
static void OnCanceled2(object state)
{
var self = (_SkipUntilCanceled)state;
if (self.isCanceled == 0)
{
if (Interlocked.Increment(ref self.isCanceled) == 1)
{
self.cancellationTokenRegistration2.Dispose();
self.SourceMoveNext();
}
}
}
public UniTask DisposeAsync()
{
TaskTracker.RemoveTracking(this);
cancellationTokenRegistration1.Dispose();
cancellationTokenRegistration2.Dispose();
if (enumerator != null)
{
return enumerator.DisposeAsync();
}
return default;
}
}
}
}