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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/callback.h"
#include "chromeos/chromeos_export.h"
#include "chromeos/dbus/dbus_client.h"
namespace chromeos {
// SystemClockClient is used to communicate with the system clock.
class CHROMEOS_EXPORT SystemClockClient : public DBusClient {
public:
// Interface for observing changes from the system clock.
class Observer {
public:
// Called when the status is updated.
virtual void SystemClockUpdated();
// Called when the system clock has become settable or unsettable, e.g.,
// when the clock syncs with or goes out of sync with the network.
virtual void SystemClockCanSetTimeChanged(bool can_set_time);
protected:
virtual ~Observer() {}
};
~SystemClockClient() override;
// Adds the given observer.
virtual void AddObserver(Observer* observer) = 0;
// Removes the given observer if this object has the observer.
virtual void RemoveObserver(Observer* observer) = 0;
// Returns true if this object has the given observer.
virtual bool HasObserver(const Observer* observer) const = 0;
// Sets the system clock.
virtual void SetTime(int64 time_in_seconds) = 0;
// Checks if the system time can be set.
virtual bool CanSetTime() = 0;
// Creates the instance.
static SystemClockClient* Create();
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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