51 lines
1.2 KiB
C#
51 lines
1.2 KiB
C#
namespace System.Web.Mvc.Async {
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using System;
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using System.Threading;
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public sealed class OperationCounter {
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private int _count;
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public int Count {
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get {
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return Thread.VolatileRead(ref _count);
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}
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}
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public event EventHandler Completed;
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private int AddAndExecuteCallbackIfCompleted(int value) {
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int newCount = Interlocked.Add(ref _count, value);
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if (newCount == 0) {
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OnCompleted();
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}
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return newCount;
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}
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public int Decrement() {
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return AddAndExecuteCallbackIfCompleted(-1);
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}
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public int Decrement(int value) {
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return AddAndExecuteCallbackIfCompleted(-value);
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}
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public int Increment() {
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return AddAndExecuteCallbackIfCompleted(1);
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}
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public int Increment(int value) {
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return AddAndExecuteCallbackIfCompleted(value);
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}
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private void OnCompleted() {
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EventHandler handler = Completed;
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if (handler != null) {
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handler(this, EventArgs.Empty);
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}
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}
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}
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}
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