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RC: cancellation support for promises + tests
RC: cancellation support for promises + tests
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r145:706fccb85524 v2
r145:706fccb85524 v2
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ActionTaskBase.cs
55 lines | 1.5 KiB | text/x-csharp | CSharpLexer
/ Implab / ActionTaskBase.cs
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using System;
using System.Threading;
namespace Implab {
public class ActionTaskBase : AbstractPromise {
readonly Action<Exception> m_cancel;
readonly Action<Exception> m_error;
int m_cancelationLock;
protected ActionTaskBase( Action<Exception> error, Action<Exception> cancel) {
m_error = error;
m_cancel = cancel;
}
public void Reject(Exception error) {
Safe.ArgumentNotNull(error, "error");
if (LockCancelation())
HandleErrorInternal(error);
}
protected void HandleErrorInternal(Exception error) {
if (m_error != null) {
try {
m_error(error);
SetResult();
} catch(Exception err) {
SetError(err);
}
} else {
SetError(error);
}
}
public override void CancelOperation(Exception reason) {
if (LockCancelation()) {
if (m_cancel != null) {
try {
m_cancel(reason);
SetResult();
} catch (Exception err) {
HandleErrorInternal(err);
}
} else {
SetCancelled(reason);
}
}
}
protected bool LockCancelation() {
return 0 == Interlocked.CompareExchange(ref m_cancelationLock, 1, 0);
}
}
}