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annotate Implab/AbstractTask.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 /// <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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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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