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annotate Implab/AbstractTask.cs @ 187:dd4a3590f9c6 ref20160224

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Reworked cancelation handling, if the cancel handler isn't specified the OperationCanceledException will be handled by the error handler Any unhandled OperationCanceledException will cause the promise cancelation
author cin
date Tue, 19 Apr 2016 17:35:20 +0300
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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 /// <summary>
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6 /// Базовый класс для реализации задачь. Задача представляет собой некторое
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7 /// действие, которое можно иницировать и обработать результат его выполнения
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8 /// в виде обещания, для этого оно реализует интерфейс <see cref="IPromise"/>.
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9 /// </summary>
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10 /// <remarks>
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11 /// Данный класс определяет стандартное поведение при обработки результатов, в частности
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12 /// обработку <see cref="System.OperationCanceledException"/> и <see cref="PromiseTransientException"/>
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13 /// </remarks>
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14 public abstract class AbstractTask : AbstractPromise {
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15 int m_cancelationLock;
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16
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17 /// <summary>
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18 /// Получает эксклюзивное право отмены задания, используется для отмены задания до начала его выполнения.
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19 /// </summary>
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20 /// <returns><c>true</c>, if cancelation was locked, <c>false</c> otherwise.</returns>
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21 protected bool LockCancelation() {
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22 return 0 == Interlocked.CompareExchange(ref m_cancelationLock, 1, 0);
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23 }
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24
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25
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26
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27 protected void SetErrorInternal(Exception error) {
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28 // unwrap
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29 while (error is PromiseTransientException && error.InnerException != null)
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30 error = error.InnerException;
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31
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32 if (error is OperationCanceledException)
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33 SetCancelled(error);
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34 else
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35 SetError(error);
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36 }
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37
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38 protected void SetCancelledInternal(Exception reason) {
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39 SetCancelled(
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40 reason == null ? new OperationCanceledException() : reason is OperationCanceledException ? reason : new OperationCanceledException(null, reason)
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41 );
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42 }
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43 }
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44 }
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