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[email protected]e87640bd2014-06-18 16:44:001// 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#ifndef PPAPI_PROXY_MESSAGE_HANDLER_H_
6#define PPAPI_PROXY_MESSAGE_HANDLER_H_
7
8#include "base/memory/ref_counted.h"
9#include "base/memory/scoped_ptr.h"
10#include "ppapi/c/pp_resource.h"
11#include "ppapi/c/ppp_message_handler.h"
12#include "ppapi/proxy/ppapi_proxy_export.h"
13
14namespace IPC {
15class Message;
16}
17
18namespace ppapi {
19
20class ScopedPPVar;
21
22namespace proxy {
23
24class MessageLoopResource;
25
26// MessageHandler wraps a PPP_MessageHandler to encapsulate calling methods
27// on the right thread and calling the Destroy function when this
28// MessageHandler is destroyed.
29class PPAPI_PROXY_EXPORT MessageHandler {
30 public:
31 // Create a MessageHandler. If any parameters are invalid, it will return a
32 // null scoped_ptr and set |*error| appropriately.
33 // |handler_if| is the struct of function pointers we will invoke. All of
34 // the function pointers within must be valid, or we fail
35 // with PP_ERROR_BADARGUMENT.
36 // |user_data| is a pointer provided by the plugin that we pass back when we
37 // call functions in |handler_if|.
38 // |message_loop| is the message loop where we will invoke functions in
39 // |handler_if|. Must not be the main thread message loop,
40 // to try to force the plugin to not over-subscribe the main
41 // thread. If it's the main thread loop, |error| will be set
42 // to PP_ERROR_WRONGTHREAD.
43 // |error| is an out-param that will be set on failure.
44 static scoped_ptr<MessageHandler> Create(
45 PP_Instance instance,
46 const PPP_MessageHandler_0_1* handler_if,
47 void* user_data,
48 PP_Resource message_loop,
49 int32_t* error);
50 ~MessageHandler();
51
52 bool LoopIsValid() const;
53
54 void HandleMessage(ScopedPPVar var);
55 void HandleBlockingMessage(ScopedPPVar var,
56 scoped_ptr<IPC::Message> reply_msg);
57
58 private:
59 MessageHandler(PP_Instance instance,
60 const PPP_MessageHandler_0_1* handler_if,
61 void* user_data,
62 scoped_refptr<MessageLoopResource> message_loop);
63
64 PP_Instance instance_;
65 const PPP_MessageHandler_0_1* handler_if_;
66 void* user_data_;
67 scoped_refptr<MessageLoopResource> message_loop_;
68
69 DISALLOW_COPY_AND_ASSIGN(MessageHandler);
70};
71
72} // namespace proxy
73} // namespace ppapi
74
75#endif // PPAPI_PROXY_MESSAGE_HANDLER_H_