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annotate Implab/ActionChainTaskBase.cs @ 189:b60643b47078 ref20160224

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Закрыть ветку ref20160224
author cin
date Fri, 22 Apr 2016 13:07:41 +0300
parents dd4a3590f9c6
children 40d7fed4a09e
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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 class ActionChainTaskBase : AbstractTask {
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6 readonly Func<Exception, IPromise> m_error;
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7 readonly Func<Exception, IPromise> m_cancel;
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8
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9 protected ActionChainTaskBase(Func<Exception, IPromise> error, Func<Exception, IPromise> cancel, bool autoCancellable) {
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10 m_error = error;
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11 m_cancel = cancel;
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12 if (autoCancellable)
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13 CancellationRequested(CancelOperation);
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14 }
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16 public void Reject(Exception error) {
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17 if (LockCancelation())
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18 HandleErrorInternal(error);
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19 }
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20
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21 public override void CancelOperation(Exception reason) {
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22 if (LockCancelation())
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23 // отмена вызвана до начала выполнения задачи
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24 HandleCancelInternal(reason);
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25 }
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26
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27 protected void HandleCancelInternal(Exception reason) {
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28 if (m_cancel != null) {
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29 try {
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30 // вызываем обработчик отмены
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31 var p = m_cancel(reason);
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32 p.On(SetResult, HandleErrorInternal, SetCancelledInternal);
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33 // сообщаем асинхронной операции, что клиент уже не хочет получать результат
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34 // т.е. если он инициировал отмену, задача отменилась, вызвался обрабочик отмены
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35 // отбработчику сообщили, что результат уже не нужен и уже сам обработчик решает
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36 // отдавать ли результат или подтвердить отмену (или вернуть ошибку).
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37 CancellationRequested(p.Cancel);
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38 } catch (Exception err) {
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39 HandleErrorInternal(err);
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40 }
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41 } else {
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42 HandleErrorInternal(reason ?? new OperationCanceledException());
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43 }
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44 }
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45
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46 protected void HandleErrorInternal(Exception error) {
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47 if (m_error != null) {
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48 try {
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49 var p = m_error(error);
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50 p.On(SetResult, SetErrorInternal, SetCancelledInternal);
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51 CancellationRequested(p.Cancel);
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52 } catch (Exception err) {
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53 SetErrorInternal(error);
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54 }
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55 } else {
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56 SetErrorInternal(error);
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57 }
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58 }
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60 }
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61 }
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