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1 /* | |
2 * Copyright (C) 2013 Google Inc. All rights reserved. | |
3 * | |
4 * Redistribution and use in source and binary forms, with or without | |
5 * modification, are permitted provided that the following conditions are | |
6 * met: | |
7 * | |
8 * * Redistributions of source code must retain the above copyright | |
9 * notice, this list of conditions and the following disclaimer. | |
10 * * Redistributions in binary form must reproduce the above | |
11 * copyright notice, this list of conditions and the following disclaimer | |
12 * in the documentation and/or other materials provided with the | |
13 * distribution. | |
14 * * Neither the name of Google Inc. nor the names of its | |
15 * contributors may be used to endorse or promote products derived from | |
16 * this software without specific prior written permission. | |
17 * | |
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
29 */ | |
30 | |
31 (function(postTask) { | |
32 function fulfill(value, synchronous) | |
33 { | |
34 if (this.promise === undefined || this.promise.state !== 'pending') { | |
abarth-chromium
2013/06/14 05:07:08
Do you mean
"promise" in this
?
| |
35 return; | |
36 } | |
37 this.promise.state = 'fulfilled'; | |
38 this.promise.result = value; | |
39 var fulfillCallbacks = this.promise.fulfillCallbacks; | |
40 this.promise.fulfillCallbacks = []; | |
41 this.promise.rejectCallbacks = []; | |
42 // Detach the associated information. We don't need it from now on. | |
43 this.promise = undefined; | |
abarth-chromium
2013/06/14 05:07:08
Should we call "delete this.promise" instead?
| |
44 | |
45 if (synchronous) { | |
46 for (var i = 0; i < fulfillCallbacks.length; ++i) { | |
47 fulfillCallbacks[i](value); | |
48 } | |
49 } else { | |
50 for (var i = 0; i < fulfillCallbacks.length; ++i) { | |
51 postTask(fulfillCallbacks[i].bind(undefined, value)); | |
52 } | |
53 } | |
54 } | |
55 | |
56 function resolve(value, synchronous) | |
57 { | |
58 if (this.promise === undefined || this.promise.state !== 'pending') { | |
59 return; | |
60 } | |
61 var then = null; | |
62 if (typeof value === 'object') { | |
63 try { | |
64 then = value.then; | |
65 } catch (e) { | |
66 this.reject(e, synchronous); | |
67 return; | |
68 } | |
69 } | |
70 if (typeof then === 'function') { | |
71 try { | |
72 var self = this; | |
73 then.call(value, function(value) { | |
74 self.resolve(value, true); | |
75 }, function(value) { | |
76 self.reject(value, true); | |
77 }); | |
78 } catch (e) { | |
79 this.reject(e, synchronous); | |
80 } | |
81 return; | |
82 } | |
83 this.fulfill(value, synchronous); | |
84 } | |
85 | |
86 function reject(value, synchronous) | |
87 { | |
88 if (this.promise === undefined || this.promise.state !== 'pending') { | |
89 return; | |
90 } | |
91 this.promise.state = 'rejected'; | |
92 this.promise.result = value; | |
93 var rejectCallbacks = this.promise.rejectCallbacks; | |
94 this.promise.fulfillCallbacks = []; | |
95 this.promise.rejectCallbacks = []; | |
96 // Detach the associated information. We don't need it from now on. | |
97 this.promise = undefined; | |
98 | |
99 if (synchronous) { | |
100 for (var i = 0; i < rejectCallbacks.length; ++i) { | |
101 rejectCallbacks[i](value); | |
102 } | |
103 } else { | |
104 for (var i = 0; i < rejectCallbacks.length; ++i) { | |
105 postTask(rejectCallbacks[i].bind(undefined, value)); | |
106 } | |
107 } | |
108 } | |
109 | |
110 /** | |
111 * PromiseResolver constructor. | |
112 * @param promiseAssociated promise associated information | |
113 */ | |
114 function $PromiseResolver(promiseAssociated) | |
115 { | |
116 this.promise = promiseAssociated; | |
117 } | |
118 | |
119 $PromiseResolver.prototype = { | |
120 fulfill: fulfill, | |
121 resolve: resolve, | |
122 reject: reject | |
123 }; | |
124 | |
125 return Object.freeze($PromiseResolver); | |
126 }); | |
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