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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef PPAPI_PROXY_MESSAGE_HANDLER_H_
#define PPAPI_PROXY_MESSAGE_HANDLER_H_
#include <stdint.h>
#include <memory>
#include "base/memory/scoped_refptr.h"
#include "ppapi/c/pp_resource.h"
#include "ppapi/c/ppp_message_handler.h"
#include "ppapi/proxy/ppapi_proxy_export.h"
namespace IPC {
class Message;
}
namespace ppapi {
class ScopedPPVar;
namespace proxy {
class MessageLoopResource;
// MessageHandler wraps a PPP_MessageHandler to encapsulate calling methods
// on the right thread and calling the Destroy function when this
// MessageHandler is destroyed.
class PPAPI_PROXY_EXPORT MessageHandler {
public:
// Create a MessageHandler. If any parameters are invalid, it will return a
// null scoped_ptr and set |*error| appropriately.
// |handler_if| is the struct of function pointers we will invoke. All of
// the function pointers within must be valid, or we fail
// with PP_ERROR_BADARGUMENT.
// |user_data| is a pointer provided by the plugin that we pass back when we
// call functions in |handler_if|.
// |message_loop| is the message loop where we will invoke functions in
// |handler_if|. Must not be the main thread message loop,
// to try to force the plugin to not over-subscribe the main
// thread. If it's the main thread loop, |error| will be set
// to PP_ERROR_WRONGTHREAD.
// |error| is an out-param that will be set on failure.
static std::unique_ptr<MessageHandler> Create(
PP_Instance instance,
const PPP_MessageHandler_0_2* handler_if,
void* user_data,
PP_Resource message_loop,
int32_t* error);
MessageHandler(const MessageHandler&) = delete;
MessageHandler& operator=(const MessageHandler&) = delete;
~MessageHandler();
bool LoopIsValid() const;
void HandleMessage(ScopedPPVar var);
void HandleBlockingMessage(ScopedPPVar var,
std::unique_ptr<IPC::Message> reply_msg);
private:
MessageHandler(PP_Instance instance,
const PPP_MessageHandler_0_2* handler_if,
void* user_data,
scoped_refptr<MessageLoopResource> message_loop);
PP_Instance instance_;
const PPP_MessageHandler_0_2* handler_if_;
void* user_data_;
scoped_refptr<MessageLoopResource> message_loop_;
};
} // namespace proxy
} // namespace ppapi
#endif // PPAPI_PROXY_MESSAGE_HANDLER_H_
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