1// Copyright (c) 2013 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef CHROMEOS_DBUS_SYSTEM_CLOCK_CLIENT_H_
6#define CHROMEOS_DBUS_SYSTEM_CLOCK_CLIENT_H_
7
8#include "base/callback.h"
9#include "chromeos/chromeos_export.h"
10#include "chromeos/dbus/dbus_client.h"
11
12namespace chromeos {
13
14// SystemClockClient is used to communicate with the system clock.
15class CHROMEOS_EXPORT SystemClockClient : public DBusClient {
16 public:
17  // Interface for observing changes from the system clock.
18  class Observer {
19   public:
20    // Called when the status is updated.
21    virtual void SystemClockUpdated();
22
23    // Called when the system clock has become settable or unsettable, e.g.,
24    // when the clock syncs with or goes out of sync with the network.
25    virtual void SystemClockCanSetTimeChanged(bool can_set_time);
26
27   protected:
28    virtual ~Observer() {}
29  };
30
31  virtual ~SystemClockClient();
32
33  // Adds the given observer.
34  virtual void AddObserver(Observer* observer) = 0;
35  // Removes the given observer if this object has the observer.
36  virtual void RemoveObserver(Observer* observer) = 0;
37  // Returns true if this object has the given observer.
38  virtual bool HasObserver(Observer* observer) = 0;
39
40  // Sets the system clock.
41  virtual void SetTime(int64 time_in_seconds) = 0;
42
43  // Checks if the system time can be set.
44  virtual bool CanSetTime() = 0;
45
46  // Creates the instance.
47  static SystemClockClient* Create();
48
49 protected:
50  // Create() should be used instead.
51  SystemClockClient();
52
53 private:
54  DISALLOW_COPY_AND_ASSIGN(SystemClockClient);
55};
56
57}  // namespace chromeos
58
59#endif  // CHROMEOS_DBUS_SYSTEM_CLOCK_CLIENT_H_
60