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1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 define("mojo/public/js/bindings/connector", [ | |
6 "mojo/public/js/bindings/buffer", | |
7 "mojo/public/js/bindings/codec", | |
8 "mojo/public/js/bindings/core", | |
9 "mojo/public/js/bindings/support", | |
10 ], function(buffer, codec, core, support) { | |
11 | |
12 function Connector(handle) { | |
13 this.handle_ = handle; | |
14 this.dropWrites_ = false; | |
15 this.error_ = false; | |
16 this.incomingReceiver_ = null; | |
17 this.readWaitCookie_ = null; | |
18 this.errorHandler_ = null; | |
19 | |
20 this.waitToReadMore_(); | |
21 } | |
22 | |
23 Connector.prototype.close = function() { | |
24 if (this.readWaitCookie_) { | |
25 support.cancelWait(this.readWaitCookie_); | |
26 this.readWaitCookie_ = null; | |
27 } | |
28 if (this.handle_ != null) { | |
29 core.close(this.handle_); | |
30 this.handle_ = null; | |
31 } | |
32 }; | |
33 | |
34 Connector.prototype.accept = function(message) { | |
35 if (this.error_) | |
36 return false; | |
37 | |
38 if (this.dropWrites_) | |
39 return true; | |
40 | |
41 var result = core.writeMessage(this.handle_, | |
42 new Uint8Array(message.buffer.arrayBuffer), | |
43 message.handles, | |
44 core.WRITE_MESSAGE_FLAG_NONE); | |
45 switch (result) { | |
46 case core.RESULT_OK: | |
47 // The handles were successfully transferred, so we don't own them | |
48 // anymore. | |
49 message.handles = []; | |
50 break; | |
51 case core.RESULT_FAILED_PRECONDITION: | |
52 // There's no point in continuing to write to this pipe since the other | |
53 // end is gone. Avoid writing any future messages. Hide write failures | |
54 // from the caller since we'd like them to continue consuming any | |
55 // backlog of incoming messages before regarding the message pipe as | |
56 // closed. | |
57 this.dropWrites_ = true; | |
58 break; | |
59 default: | |
60 // This particular write was rejected, presumably because of bad input. | |
61 // The pipe is not necessarily in a bad state. | |
62 return false; | |
63 } | |
64 return true; | |
65 }; | |
66 | |
67 Connector.prototype.setIncomingReceiver = function(receiver) { | |
68 this.incomingReceiver_ = receiver; | |
69 }; | |
70 | |
71 Connector.prototype.setErrorHandler = function(handler) { | |
72 this.errorHandler_ = handler; | |
73 }; | |
74 | |
75 Connector.prototype.encounteredError = function() { | |
76 return this.error_; | |
77 }; | |
78 | |
79 Connector.prototype.waitToReadMore_ = function() { | |
80 this.readWaitCookie_ = support.asyncWait(this.handle_, | |
81 core.HANDLE_SIGNAL_READABLE, | |
82 this.readMore_.bind(this)); | |
83 }; | |
84 | |
85 Connector.prototype.readMore_ = function(result) { | |
86 for (;;) { | |
87 var read = core.readMessage(this.handle_, | |
88 core.READ_MESSAGE_FLAG_NONE); | |
89 if (read.result == core.RESULT_SHOULD_WAIT) { | |
90 this.waitToReadMore_(); | |
91 return; | |
92 } | |
93 if (read.result != core.RESULT_OK) { | |
94 this.error_ = true; | |
95 if (this.errorHandler_) | |
96 this.errorHandler_.onError(read.result); | |
97 return; | |
98 } | |
99 var messageBuffer = new buffer.Buffer(read.buffer); | |
100 var message = new codec.Message(messageBuffer, read.handles); | |
101 if (this.incomingReceiver_) { | |
102 this.incomingReceiver_.accept(message); | |
103 } | |
104 } | |
105 }; | |
106 | |
107 // The TestConnector subclass is only intended to be used in unit tests. It | |
108 // enables delivering a message to the pipe's handle without an async wait. | |
109 | |
110 function TestConnector(handle) { | |
111 Connector.call(this, handle); | |
112 } | |
113 | |
114 TestConnector.prototype = Object.create(Connector.prototype); | |
115 | |
116 TestConnector.prototype.waitToReadMore_ = function() { | |
117 }; | |
118 | |
119 TestConnector.prototype.deliverMessage = function() { | |
120 this.readMore_(core.RESULT_OK); | |
121 } | |
122 | |
123 var exports = {}; | |
124 exports.Connector = Connector; | |
125 exports.TestConnector = TestConnector; | |
126 return exports; | |
127 }); | |
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