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| 1 // Copyright 2015 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 // Handles InterfaceControlMessages for a stub. |
| 8 class ControlMessageHandler { |
| 9 static bool isControlMessage(ServiceMessage message) => |
| 10 _isRun(message) || _isRunOrClose(message); |
| 11 |
| 12 static bool _isRun(ServiceMessage message) => |
| 13 (message.header.type == icm.kRunMessageId); |
| 14 |
| 15 static bool _isRunOrClose(ServiceMessage message) => |
| 16 (message.header.type == icm.kRunOrClosePipeMessageId); |
| 17 |
| 18 static Future<Message> handleMessage(Stub stub, |
| 19 int interface_version, |
| 20 ServiceMessage message) { |
| 21 assert(isControlMessage(message)); |
| 22 if (_isRun(message)) { |
| 23 return _handleRun(stub, interface_version, message); |
| 24 } else { |
| 25 assert(_isRunOrClose(message)); |
| 26 return _handleRunOrClose(stub, interface_version, message); |
| 27 } |
| 28 } |
| 29 |
| 30 static Future<Message> _handleRun(Stub stub, |
| 31 int interface_version, |
| 32 ServiceMessage message) { |
| 33 // Construct RunMessage response. |
| 34 var response = new icm.RunResponseMessageParams(); |
| 35 response.reserved0 = 16; |
| 36 response.reserved1 = 0; |
| 37 response.queryVersionResult = new icm.QueryVersionResult(); |
| 38 response.queryVersionResult.version = interface_version; |
| 39 // Return response. |
| 40 return new Future.value( |
| 41 stub.buildResponseWithId(response, |
| 42 icm.kRunMessageId, |
| 43 message.header.requestId, |
| 44 MessageHeader.kMessageIsResponse)); |
| 45 } |
| 46 |
| 47 static Future<Message> _handleRunOrClose(Stub stub, |
| 48 int interface_version, |
| 49 ServiceMessage message) { |
| 50 // Deserialize message. |
| 51 var params = icm.RunOrClosePipeMessageParams.deserialize(message.payload); |
| 52 // Grab required version. |
| 53 var requiredVersion = params.requireVersion.version; |
| 54 if (interface_version >= requiredVersion) { |
| 55 // Stub meets the requirements. |
| 56 return; |
| 57 } |
| 58 // Stub does not implement required version. Close the pipe immediately. |
| 59 stub.close(immediate: true); |
| 60 } |
| 61 } |
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