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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 REMOTING_CHROMOTING_HOST_H_
#define REMOTING_CHROMOTING_HOST_H_
#include <string>
#include "base/thread.h"
#include "remoting/base/encoder.h"
#include "remoting/host/capturer.h"
#include "remoting/host/client_connection.h"
#include "remoting/host/event_executor.h"
#include "remoting/host/heartbeat_sender.h"
#include "remoting/jingle_glue/jingle_client.h"
#include "remoting/jingle_glue/jingle_thread.h"
class Task;
namespace remoting {
class Capturer;
class ChromotingHostContext;
class Encoder;
class EventExecutor;
class MutableHostConfig;
class SessionManager;
// A class to implement the functionality of a host process.
//
// Here's the work flow of this class:
// 1. We should load the saved GAIA ID token or if this is the first
// time the host process runs we should prompt user for the
// credential. We will use this token or credentials to authenicate
// and register the host.
//
// 2. We listen for incoming connection using libjingle. We will create
// a ClientConnection object that wraps around linjingle for transport. Also
// create a SessionManager with appropriate Encoder and Capturer and
// add the ClientConnection to this SessionManager for transporting the
// screen captures. A EventExecutor is created and registered with the
// ClientConnection to receive mouse / keyboard events from the remote
// client.
// This is also the right time to create multiple threads to host
// the above objects. After we have done all the initialization
// we'll start the SessionManager. We'll then enter the running state
// of the host process.
//
// 3. When the user is disconencted, we will pause the SessionManager
// and try to terminate the threads we have created. This will allow
// all pending tasks to complete. After all of that completed we
// return to the idle state. We then go to step (2) if there a new
// incoming connection.
class ChromotingHost : public base::RefCountedThreadSafe<ChromotingHost>,
public ClientConnection::EventHandler,
public JingleClient::Callback {
public:
ChromotingHost(ChromotingHostContext* context, MutableHostConfig* config,
Capturer* capturer, Encoder* encoder, EventExecutor* executor);
virtual ~ChromotingHost();
// Start the host process. This method starts the chromoting host
// asynchronously.
//
// |shutdown_task| is called if Start() has failed ot Shutdown() is called
// and all related operations are completed.
//
// This method can only be called once during the lifetime of this object.
void Start(Task* shutdown_task);
// This method is called when we need to destroy the host process.
void Shutdown();
// This method is called if a client is connected to this object.
void OnClientConnected(ClientConnection* client);
// This method is called if a client is disconnected from the host.
void OnClientDisconnected(ClientConnection* client);
////////////////////////////////////////////////////////////////////////////
// ClientConnection::EventHandler implementations
virtual void HandleMessages(ClientConnection* client,
ClientMessageList* messages);
virtual void OnConnectionOpened(ClientConnection* client);
virtual void OnConnectionClosed(ClientConnection* client);
virtual void OnConnectionFailed(ClientConnection* client);
////////////////////////////////////////////////////////////////////////////
// JingleClient::Callback implementations
virtual void OnStateChange(JingleClient* client, JingleClient::State state);
virtual bool OnAcceptConnection(
JingleClient* jingle, const std::string& jid,
JingleChannel::Callback** channel_callback);
virtual void OnNewConnection(
JingleClient* jingle,
scoped_refptr<JingleChannel> channel);
private:
enum State {
kInitial,
kStarted,
kStopped,
};
// This method connects to the talk network and start listening for incoming
// connections.
void DoStart(Task* shutdown_task);
// This method shuts down the host process.
void DoShutdown();
// The context that the chromoting host runs on.
ChromotingHostContext* context_;
scoped_refptr<MutableHostConfig> config_;
// Capturer to be used by SessionManager. Once the SessionManager is
// constructed this is set to NULL.
scoped_ptr<Capturer> capturer_;
// Encoder to be used by the SessionManager. Once the SessionManager is
// constructed this is set to NULL.
scoped_ptr<Encoder> encoder_;
// EventExecutor executes input events received from the client.
scoped_ptr<EventExecutor> executor_;
// The libjingle client. This is used to connect to the talk network to
// receive connection requests from chromoting client.
scoped_refptr<JingleClient> jingle_client_;
// Objects that takes care of sending heartbeats to the chromoting bot.
scoped_refptr<HeartbeatSender> heartbeat_sender_;
// A ClientConnection manages the connectino to a remote client.
// TODO(hclam): Expand this to a list of clients.
scoped_refptr<ClientConnection> client_;
// Session manager for the host process.
scoped_refptr<SessionManager> session_;
// This task gets executed when this object fails to connect to the
// talk network or Shutdown() is called.
scoped_ptr<Task> shutdown_task_;
// Tracks the internal state of the host.
// This variable is written on the main thread of ChromotingHostContext
// and read by jingle thread.
State state_;
// Lock is to lock the access to |state_|.
Lock lock_;
DISALLOW_COPY_AND_ASSIGN(ChromotingHost);
};
} // namespace remoting
#endif // REMOTING_HOST_CHROMOTING_HOST_H_
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