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annotate Implab/FuncChainTaskBase.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
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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 FuncChainTaskBase<TResult> : AbstractTask<TResult> {
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5 readonly Func<Exception, IPromise<TResult>> m_error;
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6 readonly Func<Exception, IPromise<TResult>> m_cancel;
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7
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8 protected FuncChainTaskBase( Func<Exception, IPromise<TResult>> error, Func<Exception, IPromise<TResult>> cancel, bool autoCancellable) {
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9 m_error = error;
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10 m_cancel = cancel;
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11 if (autoCancellable)
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12 CancellationRequested(CancelOperation);
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13 }
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15 public void Reject(Exception error) {
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16 if (LockCancelation())
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17 HandleErrorInternal(error);
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18 }
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19
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20 public override void CancelOperation(Exception reason) {
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21 if (LockCancelation())
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22 HandleCancelInternal(reason);
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23 }
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24
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25 protected void HandleErrorInternal(Exception error) {
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26 if (m_error != null) {
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27 try {
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28 var p = m_error(error);
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29 p.On(SetResult, SetErrorInternal, SetCancelledInternal);
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30 CancellationRequested(p.Cancel);
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31 } catch(Exception err) {
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32 SetErrorInternal(err);
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33 }
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34 } else {
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35 SetErrorInternal(error);
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36 }
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37 }
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38
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39 protected void HandleCancelInternal(Exception reason) {
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40 if (m_cancel != null) {
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41 try {
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42 var p = m_cancel(reason);
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43 p.On(SetResult, HandleErrorInternal, SetCancelledInternal);
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44 CancellationRequested(p.Cancel);
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45 } catch (Exception err) {
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46 SetErrorInternal(err);
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47 }
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48 } else {
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49 SetCancelledInternal(reason);
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50 }
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51 }
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52 }
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53 }
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