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// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_SERVICE_SERVICE_PROCESS_CONTROL_H_
#define CHROME_BROWSER_SERVICE_SERVICE_PROCESS_CONTROL_H_
#include <queue>
#include "base/id_map.h"
#include "base/process.h"
#include "base/scoped_ptr.h"
#include "base/task.h"
#include "chrome/common/service_process_type.h"
#include "ipc/ipc_sync_channel.h"
class Profile;
// A ServiceProcessControl works as a portal between the service process and
// the browser process.
//
// It is used to start and terminate the service process. It is also used
// to send and receive IPC messages from the service process.
//
// THREADING
//
// This class is accessed on the UI thread through some UI actions. It then
// talks to the IPC channel on the IO thread.
class ServiceProcessControl : public IPC::Channel::Sender,
public IPC::Channel::Listener {
public:
typedef IDMap<ServiceProcessControl>::iterator iterator;
typedef std::queue<IPC::Message> MessageQueue;
// An interface for handling messages received from the service process.
class MessageHandler {
public:
virtual ~MessageHandler() {}
// This is a test signal sent from the service process. This can be used
// the healthiness of the service.
virtual void OnGoodDay() = 0;
};
// Construct a ServiceProcessControl with |profile| and a specific |type|.
ServiceProcessControl(Profile* profile, ServiceProcessType type);
virtual ~ServiceProcessControl();
// Return the user profile associated with this service process.
Profile* profile() const { return profile_; }
// Return the type of this object.
ServiceProcessType type() const { return type_; }
// Return true if this object is connected to the service.
bool is_connected() const { return channel_.get() != NULL; }
// Initialize the connection to the service process.
// |connect_done_task| is invoked if the connection has succeeded or failed.
// User should call is_connected() to check the connection status.
void Connect(Task* connect_done_task);
// Create a new service process and connects to it.
// |launch_done_task| is called if launching the service process has failed
// or we have successfully launched the process and connected to it.
void Launch(Task* launch_done_task);
// IPC::Channel::Listener implementation.
virtual void OnMessageReceived(const IPC::Message& message);
virtual void OnChannelConnected(int32 peer_pid);
virtual void OnChannelError();
// IPC::Channel::Sender implementation
virtual bool Send(IPC::Message* message);
// Send a hello message to the service process for testing purpose.
// Return true if the message was sent.
bool SendHello();
// Send a shutdown message to the service process. IPC channel will be
// destroyed after calling this method.
// Return true if the message was sent.
bool Shutdown();
// Set the message handler for receiving messages from the service process.
// TODO(hclam): Allow more than 1 handler.
void SetMessageHandler(MessageHandler* message_handler) {
message_handler_ = message_handler;
}
private:
class Launcher;
// Method called by Launcher when the service process is launched.
void OnProcessLaunched(Task* launch_done_task);
// Used internally to connect to the service process.
void ConnectInternal();
Profile* profile_;
ServiceProcessType type_;
// IPC channel to the service process.
scoped_ptr<IPC::SyncChannel> channel_;
// Service process launcher.
scoped_refptr<Launcher> launcher_;
// Callback that gets invoked when the channel is connected or failed to
// connect.
scoped_ptr<Task> connect_done_task_;
// Handler for messages from service process.
MessageHandler* message_handler_;
};
#endif // CHROME_BROWSER_SERVICE_SERVICE_PROCESS_H_
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