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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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10 readonly AbstractPromise m_promise;
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11 readonly IDispatcher m_dispatcher;
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12
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13 internal Deferred(AbstractPromise promise, IDispatcher dispatcher) {
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14 Debug.Assert(promise != null);
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15 m_promise = promise;
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16 m_dispatcher = dispatcher;
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17 }
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18
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19 public IPromise Promise {
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20 get { return m_promise; }
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21 }
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22
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23 public void Reject(Exception error) {
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24 m_promise.Reject(error);
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25 }
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26
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27 public void Resolve() {
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28 m_promise.Resolve();
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29 }
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30
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31 public void Resolve(IPromise thenable) {
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32 if (thenable == null)
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33 Reject(new Exception("The promise or task are expected"));
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34 if (thenable == m_promise)
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35 Reject(new Exception("The promise cannot be resolved with oneself"));
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36
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37 else if (m_dispatcher != null)
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38 // dispatch (see ecma-262/6.0: 25.4.1.3.2 Promise Resolve Functions)
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39 m_dispatcher.Enqueue(() => thenable.Then(this));
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40 else
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41 thenable.Then(this);
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42 }
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43
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44 void Chain(IPromise thenable) {
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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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51 }
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52 } |
