[email protected] | e87640bd | 2014-06-18 16:44:00 | [diff] [blame^] | 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 | #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 | |
| 14 | namespace IPC { |
| 15 | class Message; |
| 16 | } |
| 17 | |
| 18 | namespace ppapi { |
| 19 | |
| 20 | class ScopedPPVar; |
| 21 | |
| 22 | namespace proxy { |
| 23 | |
| 24 | class 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. |
| 29 | class 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_ |