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// 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_
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