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// Copyright (c) 2013 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 CHROMEOS_DBUS_SYSTEM_CLOCK_CLIENT_H_
#define CHROMEOS_DBUS_SYSTEM_CLOCK_CLIENT_H_
#include "base/observer_list.h"
#include "chromeos/chromeos_export.h"
#include "chromeos/dbus/dbus_client_implementation_type.h"
namespace dbus {
class Bus;
} // namespace
namespace chromeos {
// SystemClockClient is used to communicate with the system clock.
class CHROMEOS_EXPORT SystemClockClient {
public:
// Interface for observing changes from the system clock.
class Observer {
public:
// Called when the status is updated.
virtual void SystemClockUpdated() {}
protected:
virtual ~Observer() {}
};
virtual ~SystemClockClient();
// Adds and removes the observer.
virtual void AddObserver(Observer* observer) = 0;
virtual void RemoveObserver(Observer* observer) = 0;
// Returns true if this object has the given observer.
virtual bool HasObserver(Observer* observer) = 0;
// Creates the instance.
static SystemClockClient* Create(DBusClientImplementationType type,
dbus::Bus* bus);
protected:
// Create() should be used instead.
SystemClockClient();
private:
DISALLOW_COPY_AND_ASSIGN(SystemClockClient);
};
} // namespace chromeos
#endif // CHROMEOS_DBUS_SYSTEM_CLOCK_CLIENT_H_
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