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246
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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 public class Deferred<T> : IResolvable<T> {
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248
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6 readonly Promise<T> m_promise;
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246
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7 readonly IDispatcher m_dispatcher;
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8
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248
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9 internal Deferred(IDispatcher dispatcher) : this(new Promise<T>(), dispatcher) {
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10 }
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11
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12 internal Deferred(Promise<T> promise, IDispatcher dispatcher) {
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246
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13 Debug.Assert(promise != null);
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14 m_promise = promise;
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15 m_dispatcher = dispatcher;
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16 }
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17
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18 public IPromise<T> Promise {
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19 get { return m_promise; }
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20 }
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21
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22 public void Reject(Exception error) {
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248
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23 if (error is PromiseTransientException)
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24 error = ((PromiseTransientException)error).InnerException;
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25
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26 m_promise.RejectPromise(error);
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246
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27 }
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28
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29 public void Resolve(T value) {
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248
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30 m_promise.ResolvePromise(value);
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246
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31 }
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32
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33 public void Resolve(IPromise<T> thenable) {
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34 if (thenable == null)
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35 Reject(new Exception("The promise or task are expected"));
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36 if (thenable == m_promise)
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37 Reject(new Exception("The promise cannot be resolved with oneself"));
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38
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39 else if (m_dispatcher != null)
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40 // dispatch (see ecma-262/6.0: 25.4.1.3.2 Promise Resolve Functions)
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248
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41 m_dispatcher.Enqueue(Chain, thenable);
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42 else
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43 Chain(thenable);
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44 }
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45
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46 void Chain(IPromise<T> thenable) {
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47 try {
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48 thenable.Then(this);
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49 } catch (Exception err) {
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50 Reject(err);
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51 }
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52 }
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53 }
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54 } |
