Auto status change to "Under Review"
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1 | 1 | using System; |
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2 | 2 | using System.Diagnostics; |
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3 | 3 | |
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4 | 4 | namespace Implab { |
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5 | 5 | /// <summary> |
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6 | 6 | /// This class is responsible for the promise resolution, dispatching and chaining |
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7 | 7 | /// </summary> |
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8 | 8 | public class Deferred : IResolvable { |
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9 | 9 | |
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10 | 10 | readonly AbstractPromise m_promise; |
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11 | 11 | readonly IDispatcher m_dispatcher; |
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12 | 12 | |
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13 | 13 | internal Deferred(AbstractPromise promise, IDispatcher dispatcher) { |
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14 | 14 | Debug.Assert(promise != null); |
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15 | 15 | m_promise = promise; |
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16 | 16 | m_dispatcher = dispatcher; |
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17 | 17 | } |
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18 | 18 | |
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19 | 19 | public IPromise Promise { |
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20 | 20 | get { return m_promise; } |
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21 | 21 | } |
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22 | 22 | |
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23 | 23 | public void Reject(Exception error) { |
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24 | 24 | m_promise.Reject(error); |
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25 | 25 | } |
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26 | 26 | |
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27 | 27 | public void Resolve() { |
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28 | 28 | m_promise.Resolve(); |
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29 | 29 | } |
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30 | 30 | |
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31 | 31 | public void Resolve(IPromise thenable) { |
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32 | 32 | if (thenable == null) |
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33 | 33 | Reject(new Exception("The promise or task are expected")); |
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34 | 34 | if (thenable == m_promise) |
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35 | 35 | Reject(new Exception("The promise cannot be resolved with oneself")); |
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36 | 36 | |
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37 | 37 | else if (m_dispatcher != null) |
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38 | 38 | // dispatch (see ecma-262/6.0: 25.4.1.3.2 Promise Resolve Functions) |
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39 |
m_dispatcher.Enqueue(() => thenable |
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39 | m_dispatcher.Enqueue(() => Chain(thenable)); | |
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40 | 40 | else |
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41 |
thenable |
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41 | Chain(thenable); | |
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42 | 42 | } |
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43 | 43 | |
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44 | 44 | void Chain(IPromise thenable) { |
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45 | 45 | try { |
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46 | 46 | thenable.Then(this); |
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47 | 47 | } catch (Exception err) { |
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48 | 48 | Reject(err); |
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49 | 49 | } |
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50 | 50 | } |
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51 | 51 | } |
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52 | 52 | } No newline at end of file |
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1 | 1 | using System; |
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2 | 2 | |
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3 | 3 | namespace Implab { |
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4 | 4 | /// <summary> |
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5 | 5 | /// Deferred result, usually used by asynchronous services as the service part of the promise. |
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6 | 6 | /// </summary> |
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7 | 7 | public interface IResolvable { |
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8 | 8 | |
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9 | 9 | void Resolve(); |
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10 | 10 | |
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11 | void Resolve(IPromise thenable); | |
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12 | ||
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13 | 11 | /// <summary> |
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14 | 12 | /// Reject the promise with the specified error. |
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15 | 13 | /// </summary> |
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16 | 14 | /// <param name="error">The reason why the promise is rejected.</param> |
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17 | 15 | /// <remarks> |
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18 | 16 | /// Some exceptions are treated in a special case: |
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19 | 17 | /// <see cref="OperationCanceledException"/> is interpreted as call to <see cref="Cancel()"/> method, |
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20 | 18 | /// and <see cref="PromiseTransientException"/> is always unwrapped and its |
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21 | 19 | /// <see cref="PromiseTransientException.InnerException"> is used as the reason to reject promise. |
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22 | 20 | /// </remarks> |
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23 | 21 | void Reject(Exception error); |
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24 | 22 | } |
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25 | 23 | } |
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26 | 24 | |
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