blob: 4f5f994e91e40fad1a71cd8b7f517e72cc0c283a [file] [log] [blame]
// 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/binding_set.h"
#include "services/audio/public/mojom/device_notifications.mojom.h"
#include "services/audio/traced_service_ref.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(mojom::DeviceNotifierRequest request, TracedServiceRef context_ref);
// mojom::DeviceNotifier implementation.
void RegisterListener(mojom::DeviceListenerPtr 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, mojom::DeviceListenerPtr> listeners_;
mojo::BindingSet<mojom::DeviceNotifier, TracedServiceRef> bindings_;
const scoped_refptr<base::SequencedTaskRunner> task_runner_;
base::WeakPtrFactory<DeviceNotifier> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(DeviceNotifier);
};
} // namespace audio
#endif // SERVICES_AUDIO_DEVICE_NOTIFIER_H_