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// Copyright 2014 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.
#include <memory>
#include "base/callback_list.h"
#include "base/macros.h"
#include "base/memory/singleton.h"
#include "device/battery/battery_export.h"
#include "device/battery/battery_status.mojom.h"
namespace base {
class SingleThreadTaskRunner;
namespace device {
class BatteryStatusManager;
class DEVICE_BATTERY_EXPORT BatteryStatusService {
typedef base::Callback<void(const BatteryStatus&)> BatteryUpdateCallback;
typedef base::CallbackList<void(const BatteryStatus&)>
typedef BatteryUpdateCallbackList::Subscription BatteryUpdateSubscription;
// Returns the BatteryStatusService singleton.
static BatteryStatusService* GetInstance();
// Adds a callback to receive battery status updates. Must be called on the
// main thread. The callback itself will be called on the main thread as well.
// NOTE: The callback may be run before AddCallback returns!
std::unique_ptr<BatteryUpdateSubscription> AddCallback(
const BatteryUpdateCallback& callback);
// Gracefully clean-up.
void Shutdown();
// Injects a custom battery status manager for testing purposes.
void SetBatteryManagerForTesting(
std::unique_ptr<BatteryStatusManager> test_battery_manager);
// Returns callback to invoke when battery is changed. Used for testing.
const BatteryUpdateCallback& GetUpdateCallbackForTesting() const;
friend struct base::DefaultSingletonTraits<BatteryStatusService>;
friend class BatteryStatusServiceTest;
virtual ~BatteryStatusService();
// Updates current battery status and sends new status to interested
// render processes. Can be called on any thread via a callback.
void NotifyConsumers(const BatteryStatus& status);
void NotifyConsumersOnMainThread(const BatteryStatus& status);
void ConsumersChanged();
scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner_;
std::unique_ptr<BatteryStatusManager> battery_fetcher_;
BatteryUpdateCallbackList callback_list_;
BatteryUpdateCallback update_callback_;
BatteryStatus status_;
bool status_updated_;
bool is_shutdown_;
} // namespace device