##// END OF EJS Templates
implab » ImplabNet
RSS
fixed timeout handling in promises
fixed timeout handling in promises
cin - - Load All Authors

File last commit:

r145:706fccb85524 v2
r148:e6d4b41f0101 v2
Show More
ActionChainTaskBase.cs
62 lines | 1.7 KiB | text/x-csharp | CSharpLexer
/ Implab / ActionChainTaskBase.cs
History | Annotation | Raw |Copy content |Copy permalink
using System;
using System.Threading;
namespace Implab {
public class ActionChainTaskBase : AbstractPromise {
readonly Func<Exception, IPromise> m_error;
readonly Func<Exception, IPromise> m_cancel;
int m_cancelationLock;
protected ActionChainTaskBase( Func<Exception, IPromise> error, Func<Exception, IPromise> cancel) {
m_error = error;
m_cancel = cancel;
}
public void Reject(Exception error) {
if (LockCancelation())
HandleErrorInternal(error);
}
public override void CancelOperation(Exception reason) {
if (m_cancel != null && LockCancelation()) {
try {
Observe(m_cancel(reason));
} catch(Exception err) {
HandleErrorInternal(err);
}
}
}
protected void HandleErrorInternal(Exception error) {
if (m_error != null) {
try {
Observe(m_error(error));
} catch(Exception err) {
SetError(err);
}
} else {
SetError(error);
}
}
protected void Observe(IPromise operation) {
if (operation == null)
throw new NullReferenceException("The task returned null promise");
// pass operation results to the current promise
operation.On(SetResult, SetError, SetCancelled);
// pass the cancelation request
CancellationRequested(operation.Cancel);
}
protected bool LockCancelation() {
return 0 == Interlocked.CompareExchange(ref m_cancelationLock, 1, 0);
}
}
}