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annotate Implab/ActionChainTask.cs @ 196:40d7fed4a09e

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fixed promise chaining behavior, the error handler doesn't handle result or cancellation handlers exceptions these exceptions are propagated to the next handlers.
author cin
date Mon, 29 Aug 2016 23:15:51 +0300
parents dd4a3590f9c6
children eee3e49dd1ff
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1 using System;
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2
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3 namespace Implab {
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4 public class ActionChainTask : ActionChainTaskBase, IDeferred {
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5 readonly Func<IPromise> m_task;
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6
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7 /// <summary>
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8 /// Initializes a new instance of the <see cref="Implab.ActionChainTask"/> class.
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9 /// </summary>
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10 /// <param name="task">The operation which will be performed when the <see cref="Resolve()"/> is called.</param>
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11 /// <param name="error">The error handler which will invoke when the <see cref="Reject(Exception)"/> is called or when the task fails with an error.</param>
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12 /// <param name="cancel">The cancellation handler.</param>
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13 /// <param name="autoCancellable">If set to <c>true</c> will automatically accept
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14 /// all cancel requests before the task is started with <see cref="Resolve()"/>,
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15 /// after that all requests are directed to the task.</param>
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16 public ActionChainTask(Func<IPromise> task, Func<Exception, IPromise> error, Func<Exception, IPromise> cancel, bool autoCancellable) : base(error,cancel, autoCancellable) {
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17 m_task = task;
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18 }
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19
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20 public void Resolve() {
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21 if (m_task != null && LockCancelation()) {
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22 try {
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23 var p = m_task();
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24 p.On(SetResult, HandleErrorInternal, HandleCancelInternal);
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25 CancellationRequested(p.Cancel);
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26 } catch(Exception err) {
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27 SetErrorInternal(err);
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28 }
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29 }
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30 }
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32 }
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33 }
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