1 namespace System.Web.Mvc.Async {
3 using System.Threading;
5 public sealed class OperationCounter {
11 return Thread.VolatileRead(ref _count);
15 public event EventHandler Completed;
17 private int AddAndExecuteCallbackIfCompleted(int value) {
18 int newCount = Interlocked.Add(ref _count, value);
26 public int Decrement() {
27 return AddAndExecuteCallbackIfCompleted(-1);
30 public int Decrement(int value) {
31 return AddAndExecuteCallbackIfCompleted(-value);
34 public int Increment() {
35 return AddAndExecuteCallbackIfCompleted(1);
38 public int Increment(int value) {
39 return AddAndExecuteCallbackIfCompleted(value);
42 private void OnCompleted() {
43 EventHandler handler = Completed;
44 if (handler != null) {
45 handler(this, EventArgs.Empty);