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Side by Side Diff: content/common/message_router.h

Issue 10662005: Use IPC::Sender and IPC::Listener in content. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: Created 8 years, 6 months ago
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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #ifndef CONTENT_COMMON_MESSAGE_ROUTER_H_ 5 #ifndef CONTENT_COMMON_MESSAGE_ROUTER_H_
6 #define CONTENT_COMMON_MESSAGE_ROUTER_H_ 6 #define CONTENT_COMMON_MESSAGE_ROUTER_H_
7 #pragma once 7 #pragma once
8 8
9 #include "base/id_map.h" 9 #include "base/id_map.h"
10 #include "ipc/ipc_channel.h" 10 #include "ipc/ipc_listener.h"
11 #include "ipc/ipc_sender.h"
11 12
12 // The MessageRouter handles all incoming messages sent to it by routing them 13 // The MessageRouter handles all incoming messages sent to it by routing them
13 // to the correct listener. Routing is based on the Message's routing ID. 14 // to the correct listener. Routing is based on the Message's routing ID.
14 // Since routing IDs are typically assigned asynchronously by the browser 15 // Since routing IDs are typically assigned asynchronously by the browser
15 // process, the MessageRouter has the notion of pending IDs for listeners that 16 // process, the MessageRouter has the notion of pending IDs for listeners that
16 // have not yet been assigned a routing ID. 17 // have not yet been assigned a routing ID.
17 // 18 //
18 // When a message arrives, the routing ID is used to index the set of routes to 19 // When a message arrives, the routing ID is used to index the set of routes to
19 // find a listener. If a listener is found, then the message is passed to it. 20 // find a listener. If a listener is found, then the message is passed to it.
20 // Otherwise, the message is ignored if its routing ID is not equal to 21 // Otherwise, the message is ignored if its routing ID is not equal to
21 // MSG_ROUTING_CONTROL. 22 // MSG_ROUTING_CONTROL.
22 // 23 //
23 // The MessageRouter supports the IPC::Message::Sender interface for outgoing 24 // The MessageRouter supports the IPC::Sender interface for outgoing messages,
24 // messages, but does not define a meaningful implementation of it. The 25 // but does not define a meaningful implementation of it. The subclass of
25 // subclass of MessageRouter is intended to provide that if appropriate. 26 // MessageRouter is intended to provide that if appropriate.
26 // 27 //
27 // The MessageRouter can be used as a concrete class provided its Send method 28 // The MessageRouter can be used as a concrete class provided its Send method
28 // is not called and it does not receive any control messages. 29 // is not called and it does not receive any control messages.
29 30
30 class MessageRouter : public IPC::Channel::Listener, 31 class MessageRouter : public IPC::Listener, public IPC::Sender {
31 public IPC::Message::Sender {
32 public: 32 public:
33 MessageRouter(); 33 MessageRouter();
34 virtual ~MessageRouter(); 34 virtual ~MessageRouter();
35 35
36 // Implemented by subclasses to handle control messages 36 // Implemented by subclasses to handle control messages
37 virtual bool OnControlMessageReceived(const IPC::Message& msg); 37 virtual bool OnControlMessageReceived(const IPC::Message& msg);
38 38
39 // IPC::Channel::Listener implementation: 39 // IPC::Listener implementation:
40 virtual bool OnMessageReceived(const IPC::Message& msg) OVERRIDE; 40 virtual bool OnMessageReceived(const IPC::Message& msg) OVERRIDE;
41 41
42 // Like OnMessageReceived, except it only handles routed messages. Returns 42 // Like OnMessageReceived, except it only handles routed messages. Returns
43 // true if the message was dispatched, or false if there was no listener for 43 // true if the message was dispatched, or false if there was no listener for
44 // that route id. 44 // that route id.
45 virtual bool RouteMessage(const IPC::Message& msg); 45 virtual bool RouteMessage(const IPC::Message& msg);
46 46
47 // IPC::Message::Sender implementation: 47 // IPC::Sender implementation:
48 virtual bool Send(IPC::Message* msg) OVERRIDE; 48 virtual bool Send(IPC::Message* msg) OVERRIDE;
49 49
50 // Called to add/remove a listener for a particular message routing ID. 50 // Called to add/remove a listener for a particular message routing ID.
51 void AddRoute(int32 routing_id, IPC::Channel::Listener* listener); 51 void AddRoute(int32 routing_id, IPC::Listener* listener);
52 void RemoveRoute(int32 routing_id); 52 void RemoveRoute(int32 routing_id);
53 53
54 IPC::Channel::Listener* ResolveRoute(int32 routing_id); 54 IPC::Listener* ResolveRoute(int32 routing_id);
55 55
56 private: 56 private:
57 // A list of all listeners with assigned routing IDs. 57 // A list of all listeners with assigned routing IDs.
58 IDMap<IPC::Channel::Listener> routes_; 58 IDMap<IPC::Listener> routes_;
59 59
60 DISALLOW_COPY_AND_ASSIGN(MessageRouter); 60 DISALLOW_COPY_AND_ASSIGN(MessageRouter);
61 }; 61 };
62 62
63 #endif // CONTENT_COMMON_MESSAGE_ROUTER_H_ 63 #endif // CONTENT_COMMON_MESSAGE_ROUTER_H_
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