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// Copyright (c) 2011 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_CHROMEOS_DBUS_DBUS_THREAD_MANAGER_H_
#define CHROME_BROWSER_CHROMEOS_DBUS_DBUS_THREAD_MANAGER_H_
#pragma once
#include "base/memory/scoped_ptr.h"
#include "base/memory/ref_counted.h"
namespace base {
class Thread;
};
namespace dbus {
class Bus;
};
namespace chromeos {
class CrosDBusService;
class SensorsSource;
// DBusThreadManager manages the D-Bus thread, the thread dedicated to
// handling asynchronous D-Bus operations.
//
// This class also manages D-Bus connections and D-Bus clients, which
// depend on the D-Bus thread to ensure the right order of shutdowns for
// the D-Bus thread, the D-Bus connections, and the D-Bus clients.
//
// CALLBACKS IN D-BUS CLIENTS:
//
// D-Bus clients managed by DBusThreadManager are guaranteed to be deleted
// after the D-Bus thread so the clients don't need to worry if new
// incoming messages arrive from the D-Bus thread during shutdown of the
// clients. However, the UI message loop may still be running during the
// shutdown, hence the D-Bus clients should inherit
// base::RefCountedThreadSafe if they export methods or call methods, to
// ensure that callbacks can reference |this| safely on the UI thread
// during the shutdown.
//
class DBusThreadManager {
public:
// Sets the global instance. Must be called before any calls to Get().
// We explicitly initialize and shut down the global object, rather than
// making it a Singleton, to ensure clean startup and shutdown.
static void Initialize();
// Destroys the global instance.
static void Shutdown();
// Gets the global instance. Initialize() must be called first.
static DBusThreadManager* Get();
// Returns the connection to the system bus.
dbus::Bus* system_bus() { return system_bus_.get(); }
private:
DBusThreadManager();
virtual ~DBusThreadManager();
scoped_ptr<base::Thread> dbus_thread_;
scoped_refptr<dbus::Bus> system_bus_;
CrosDBusService* cros_dbus_service_;
scoped_refptr<SensorsSource> sensors_source_;
DISALLOW_COPY_AND_ASSIGN(DBusThreadManager);
};
} // namespace chromeos
#endif // CHROME_BROWSER_CHROMEOS_DBUS_DBUS_THREAD_MANAGER_H_
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