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annotate Implab/AbstractTaskT.cs @ 243:b1e0ffdf3451 v3

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working on promises
author cin
date Wed, 24 Jan 2018 19:24:10 +0300
parents dd4a3590f9c6
children
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dd4a3590f9c6 Reworked cancelation handling, if the cancel handler isn't specified the OperationCanceledException will be handled by the error handler
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1 using System;
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2 using System.Threading;
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3
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4 namespace Implab {
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5 public abstract class AbstractTask<T> : AbstractPromise<T> {
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6 int m_cancelationLock;
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7
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8 /// <summary>
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9 /// Получает эксклюзивное право отмены задания, используется для отмены задания до начала его выполнения.
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10 /// </summary>
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11 /// <returns><c>true</c>, if cancelation was locked, <c>false</c> otherwise.</returns>
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12 protected bool LockCancelation() {
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13 return 0 == Interlocked.CompareExchange(ref m_cancelationLock, 1, 0);
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14 }
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17
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18 protected void SetErrorInternal(Exception error) {
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19 // unwrap
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20 while (error is PromiseTransientException && error.InnerException != null)
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21 error = error.InnerException;
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22
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23 if (error is OperationCanceledException)
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24 SetCancelled(error);
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25 else
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26 SetError(error);
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27 }
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29 protected void SetCancelledInternal(Exception reason) {
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30 SetCancelled(
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31 reason == null ? new OperationCanceledException() : reason is OperationCanceledException ? reason : new OperationCanceledException(null, reason)
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32 );
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33 }
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34 }
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35 }
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