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144
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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 FuncTaskBase<TResult> : AbstractPromise<TResult> {
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6 readonly Func<Exception, TResult> m_cancel;
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7 readonly Func<Exception, TResult> m_error;
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8
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9 int m_cancelationLock;
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10
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11 protected FuncTaskBase( Func<Exception, TResult> error, Func<Exception, TResult> cancel) {
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12 m_error = error;
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13 m_cancel = cancel;
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14 }
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15
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16 public void Reject(Exception error) {
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17 Safe.ArgumentNotNull(error, "error");
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18 if (LockCancelation())
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19 HandleErrorInternal(error);
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20 }
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21
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22 protected void HandleErrorInternal(Exception error) {
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23 if (m_error != null) {
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24 try {
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25 SetResult(m_error(error));
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26 } catch(Exception err) {
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27 SetError(err);
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28 }
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29 } else {
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30 SetError(error);
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31 }
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32 }
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33
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34 public override void CancelOperation(Exception reason) {
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35 if (LockCancelation()) {
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36 if (m_cancel != null) {
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37 try {
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38 SetResult(m_cancel(reason));
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39 } catch (Exception err) {
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40 HandleErrorInternal(err);
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41 }
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42 } else {
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43 SetCancelled(reason);
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44 }
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45 }
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46 }
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47
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48 protected bool LockCancelation() {
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49 return 0 == Interlocked.CompareExchange(ref m_cancelationLock, 1, 0);
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50 }
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51 }
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52 }
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53
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