| // Copyright 2015 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_METRONOME_CLIENT_H_ |
| #define CHROMEOS_DBUS_METRONOME_CLIENT_H_ |
| |
| #include "base/basictypes.h" |
| #include "base/callback_forward.h" |
| #include "base/memory/ref_counted.h" |
| #include "chromeos/chromeos_export.h" |
| #include "chromeos/dbus/dbus_client.h" |
| #include "chromeos/dbus/dbus_client_implementation_type.h" |
| |
| namespace chromeos { |
| |
| // A DBus client class for the org.chromium.Metronome service. |
| class CHROMEOS_EXPORT MetronomeClient : public DBusClient { |
| public: |
| // Interface for observing timestamp events from a metronome client. |
| class Observer { |
| public: |
| // Called when the TimestampUpdated signal is received. |
| virtual void OnTimestampUpdated(uint64 beacon_timestamp, |
| uint64 local_timestamp) = 0; |
| virtual ~Observer() {} |
| }; |
| |
| ~MetronomeClient() override; |
| |
| // Adds and removes observers for timestamp events. |
| virtual void AddObserver(Observer* observer) = 0; |
| virtual void RemoveObserver(Observer* observer) = 0; |
| |
| // Factory function, creates a new instance and returns ownership. |
| // For normal usage, access the singleton via DBusThreadManager::Get(). |
| static MetronomeClient* Create(DBusClientImplementationType type); |
| |
| protected: |
| // Create() should be used instead. |
| MetronomeClient(); |
| |
| private: |
| DISALLOW_COPY_AND_ASSIGN(MetronomeClient); |
| }; |
| |
| } // namespace chromeos |
| |
| #endif // CHROMEOS_DBUS_METRONOME_CLIENT_H_ |