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comparison Implab/Deferred.cs @ 244:eee3e49dd1ff v3

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working on promises
author cin
date Thu, 25 Jan 2018 19:09:16 +0300
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children b904e0a3ba72
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243:b1e0ffdf3451 244:eee3e49dd1ff
1 using System;
2 using System.Diagnostics;
3
4 namespace Implab {
5 /// <summary>
6 /// This class is responsible for the promise resolution, dispatching and chaining
7 /// </summary>
8 public class Deferred : IResolvable {
9
10 readonly AbstractPromise m_promise;
11 readonly IDispatcher m_dispatcher;
12
13 internal Deferred(AbstractPromise promise, IDispatcher dispatcher) {
14 Debug.Assert(promise != null);
15 m_promise = promise;
16 m_dispatcher = dispatcher;
17 }
18
19 public IPromise Promise {
20 get { return m_promise; }
21 }
22
23 public void Reject(Exception error) {
24 m_promise.Reject(error);
25 }
26
27 public void Resolve() {
28 m_promise.Resolve();
29 }
30
31 public void Resolve(IPromise thenable) {
32 if (thenable == null)
33 Reject(new Exception("The promise or task are expected"));
34 if (thenable == m_promise)
35 Reject(new Exception("The promise cannot be resolved with oneself"));
36
37 else if (m_dispatcher != null)
38 // dispatch (see ecma-262/6.0: 25.4.1.3.2 Promise Resolve Functions)
39 m_dispatcher.Enqueue(() => thenable.Then(this));
40 else
41 thenable.Then(this);
42 }
43
44 void Chain(IPromise thenable) {
45 try {
46 thenable.Then(this);
47 } catch (Exception err) {
48 Reject(err);
49 }
50 }
51 }
52 }