79 lines
2.4 KiB
C#
79 lines
2.4 KiB
C#
// Licensed to the .NET Foundation under one or more agreements.
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// The .NET Foundation licenses this file to you under the MIT License.
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// See the LICENSE file in the project root for more information.
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using System.Threading;
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namespace System.Reactive
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{
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//
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// See AutoDetachObserver.cs for more information on the safeguarding requirement and
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// its implementation aspects.
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//
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/// <summary>
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/// This class fuses logic from ObserverBase, AnonymousObserver, and SafeObserver into one class. When an observer
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/// needs to be safeguarded, an instance of this type can be created by SafeObserver.Create when it detects its
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/// input is an AnonymousObserver, which is commonly used by end users when using the Subscribe extension methods
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/// that accept delegates for the On* handlers. By doing the fusion, we make the call stack depth shorter which
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/// helps debugging and some performance.
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/// </summary>
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internal sealed class AnonymousSafeObserver<T> : SafeObserver<T>
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{
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private readonly Action<T> _onNext;
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private readonly Action<Exception> _onError;
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private readonly Action _onCompleted;
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private int _isStopped;
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public AnonymousSafeObserver(Action<T> onNext, Action<Exception> onError, Action onCompleted)
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{
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_onNext = onNext;
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_onError = onError;
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_onCompleted = onCompleted;
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}
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public override void OnNext(T value)
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{
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if (_isStopped == 0)
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{
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var noError = false;
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try
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{
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_onNext(value);
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noError = true;
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}
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finally
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{
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if (!noError)
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{
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Dispose();
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}
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}
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}
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}
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public override void OnError(Exception error)
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{
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if (Interlocked.Exchange(ref _isStopped, 1) == 0)
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{
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using (this)
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{
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_onError(error);
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}
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}
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}
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public override void OnCompleted()
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{
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if (Interlocked.Exchange(ref _isStopped, 1) == 0)
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{
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using (this)
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{
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_onCompleted();
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}
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}
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}
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}
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}
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