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// Copyright 2018 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 SERVICES_AUDIO_DEVICE_NOTIFIER_H_
#define SERVICES_AUDIO_DEVICE_NOTIFIER_H_
#include <memory>
#include "base/containers/flat_map.h"
#include "base/system/system_monitor.h"
#include "mojo/public/cpp/bindings/pending_receiver.h"
#include "mojo/public/cpp/bindings/receiver_set.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "services/audio/public/mojom/device_notifications.mojom.h"
namespace base {
class SequencedTaskRunner;
}
namespace audio {
// This class publishes notifications about changes in the audio devices
// to registered listeners.
class DeviceNotifier final : public base::SystemMonitor::DevicesChangedObserver,
public mojom::DeviceNotifier {
public:
DeviceNotifier();
~DeviceNotifier() final;
void Bind(mojo::PendingReceiver<mojom::DeviceNotifier> receiver);
// mojom::DeviceNotifier implementation.
void RegisterListener(
mojo::PendingRemote<mojom::DeviceListener> listener) final;
// base::SystemMonitor::DevicesChangedObserver implementation;
void OnDevicesChanged(base::SystemMonitor::DeviceType device_type) final;
private:
void UpdateListeners();
void RemoveListener(int listener_id);
int next_listener_id_ = 0;
base::flat_map<int, mojo::Remote<mojom::DeviceListener>> listeners_;
mojo::ReceiverSet<mojom::DeviceNotifier> receivers_;
const scoped_refptr<base::SequencedTaskRunner> task_runner_;
base::WeakPtrFactory<DeviceNotifier> weak_factory_{this};
DISALLOW_COPY_AND_ASSIGN(DeviceNotifier);
};
} // namespace audio
#endif // SERVICES_AUDIO_DEVICE_NOTIFIER_H_
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