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//------------------------------------------------------------------------------
// <copyright file="DisposableAction.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
namespace System.Web.Util {
using System;
using System.Threading;
// Helper class for wrapping a continuation inside an IDisposable.
// This class is thread-safe.
internal sealed class DisposableAction : IDisposable {
public static readonly DisposableAction Empty = new DisposableAction(null);
private Action _disposeAction;
public DisposableAction(Action disposeAction) {
_disposeAction = disposeAction;
}
public void Dispose() {
// Interlocked allows the continuation to be executed only once
Action continuation = Interlocked.Exchange(ref _disposeAction, null);
if (continuation != null) {
continuation();
}
}
}
}
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