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1 using System;
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2 using System.Diagnostics;
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3
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4 namespace Implab {
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5 /// <summary>
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6 /// This class is responsible for the promise resolution, dispatching and chaining
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7 /// </summary>
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8 public class Deferred : IResolvable {
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9
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248
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10 readonly Promise m_promise;
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249
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11 internal Deferred() {
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12 m_promise = new Promise();
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248
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13 }
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14
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15 internal Deferred(Promise promise, IDispatcher dispatcher) {
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16 Debug.Assert(promise != null);
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17 m_promise = promise;
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18 }
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19
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20 public IPromise Promise {
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21 get { return m_promise; }
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22 }
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23
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249
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24 public void Cancel() {
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25 Reject(new OperationCanceledException());
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26 }
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27
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28 public virtual void Reject(Exception error) {
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248
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29 if (error is PromiseTransientException)
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30 error = ((PromiseTransientException)error).InnerException;
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31
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32 m_promise.RejectPromise(error);
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244
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33 }
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34
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249
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35 public virtual void Resolve() {
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248
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36 m_promise.ResolvePromise();
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244
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37 }
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38
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39 public virtual void Resolve(IPromise thenable) {
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244
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40 if (thenable == null)
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41 Reject(new Exception("The promise or task are expected"));
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42 if (thenable == m_promise)
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43 Reject(new Exception("The promise cannot be resolved with oneself"));
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44
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45 try {
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46 thenable.Then(this);
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47 } catch (Exception err) {
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48 Reject(err);
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49 }
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50 }
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249
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51
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244
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52 }
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53 } |
