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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
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249
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8 internal Deferred() {
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9 m_promise = new Promise<T>();
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248
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10 }
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11
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249
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12 protected Deferred(Promise<T> promise) {
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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 }
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16
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17 public IPromise<T> Promise {
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18 get { return m_promise; }
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19 }
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20
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249
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21 public void Cancel() {
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22 Reject(new OperationCanceledException());
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23 }
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24
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25 public virtual void Reject(Exception error) {
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248
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26 if (error is PromiseTransientException)
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27 error = ((PromiseTransientException)error).InnerException;
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28
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29 m_promise.RejectPromise(error);
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246
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30 }
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31
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249
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32 public virtual void Resolve(T value) {
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248
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33 m_promise.ResolvePromise(value);
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246
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34 }
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35
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249
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36 public virtual void Resolve(IPromise<T> thenable) {
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246
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37 if (thenable == null)
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38 Reject(new Exception("The promise or task are expected"));
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39 if (thenable == m_promise)
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40 Reject(new Exception("The promise cannot be resolved with oneself"));
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41
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42 try {
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43 thenable.Then(this);
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44 } catch (Exception err) {
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45 Reject(err);
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46 }
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47 }
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48 }
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49 } |
