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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 part of bindings; | |
6 | |
7 abstract class Interface extends core.MojoEventStreamListener { | |
8 int _outstandingResponseFutures = 0; | |
9 bool _isClosing = false; | |
10 | |
11 Interface(core.MojoMessagePipeEndpoint endpoint) : super(endpoint); | |
12 | |
13 Interface.fromHandle(core.MojoHandle handle) : super.fromHandle(handle); | |
14 | |
15 Interface.unbound() : super.unbound(); | |
16 | |
17 Future<Message> handleMessage(ServiceMessage message); | |
18 | |
19 void handleRead() { | |
20 // Query how many bytes are available. | |
21 var result = endpoint.query(); | |
22 assert(result.status.isOk || result.status.isResourceExhausted); | |
23 | |
24 // Read the data and view as a message. | |
25 var bytes = new ByteData(result.bytesRead); | |
26 var handles = new List<core.MojoHandle>(result.handlesRead); | |
27 result = endpoint.read(bytes, result.bytesRead, handles); | |
28 assert(result.status.isOk || result.status.isResourceExhausted); | |
29 | |
30 // Prepare the response. | |
31 var message = new ServiceMessage.fromMessage(new Message(bytes, handles)); | |
32 var responseFuture = _isClosing ? null : handleMessage(message); | |
33 | |
34 // If there's a response, send it. | |
35 if (responseFuture != null) { | |
36 _outstandingResponseFutures++; | |
37 responseFuture.then((response) { | |
38 _outstandingResponseFutures--; | |
39 if (isOpen) { | |
40 endpoint.write(response.buffer, | |
41 response.buffer.lengthInBytes, | |
42 response.handles); | |
43 if (!endpoint.status.isOk) { | |
44 throw "message pipe write failed: ${endpoint.status}"; | |
45 } | |
46 if (_isClosing && (_outstandingResponseFutures == 0)) { | |
47 // This was the final response future for which we needed to send | |
48 // a response. It is safe to close. | |
49 super.close(); | |
50 _isClosing = false; | |
51 } | |
52 } | |
53 }); | |
54 } else if (_isClosing && (_outstandingResponseFutures == 0)) { | |
55 // We are closing, there is no response to send for this message, and | |
56 // there are no outstanding response futures. Do the close now. | |
57 super.close(); | |
58 _isClosing = false; | |
59 } | |
60 } | |
61 | |
62 void handleWrite() { | |
63 throw 'Unexpected write signal in client.'; | |
64 } | |
65 | |
66 void close() { | |
67 if (!isOpen) return; | |
68 if (isInHandler || (_outstandingResponseFutures > 0)) { | |
69 // Either close() is being called from within handleRead() or | |
70 // handleWrite(), or close() is being called while there are outstanding | |
71 // response futures. Defer the actual close until all response futures | |
72 // have been resolved. | |
73 _isClosing = true; | |
74 } else { | |
75 super.close(); | |
76 } | |
77 } | |
78 | |
79 Message buildResponse(Struct response, int name) { | |
80 var header = new MessageHeader(name); | |
81 return response.serializeWithHeader(header); | |
82 } | |
83 | |
84 Message buildResponseWithId(Struct response, int name, int id, int flags) { | |
85 var header = new MessageHeader.withRequestId(name, flags, id); | |
86 return response.serializeWithHeader(header); | |
87 } | |
88 | |
89 void sendMessage(Struct message, int name) { | |
90 var header = new MessageHeader(name); | |
91 var serviceMessage = message.serializeWithHeader(header); | |
92 endpoint.write(serviceMessage.buffer, | |
93 serviceMessage.buffer.lengthInBytes, | |
94 serviceMessage.handles); | |
95 if (!endpoint.status.isOk) { | |
96 throw "message pipe write failed: ${endpoint.status}"; | |
97 } | |
98 } | |
99 | |
100 Future sendMessageWithRequestId(Struct response, int name, int id) { | |
101 throw "The client interface should not expect a response"; | |
102 } | |
103 } | |
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