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Issue 814543006: Move //mojo/{public, edk} underneath //third_party (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Rebase Created 5 years, 11 months ago
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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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