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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.
#ifndef CONTENT_BROWSER_BATTERY_STATUS_BATTERY_STATUS_SERVICE_H_
#define CONTENT_BROWSER_BATTERY_STATUS_BATTERY_STATUS_SERVICE_H_
#include "base/callback_list.h"
#include "base/memory/singleton.h"
#include "content/common/content_export.h"
#include "third_party/WebKit/public/platform/WebBatteryStatus.h"
namespace content {
class BatteryStatusManager;
class CONTENT_EXPORT BatteryStatusService {
public:
typedef base::Callback<void(const blink::WebBatteryStatus&)>
BatteryUpdateCallback;
typedef base::CallbackList<void(const blink::WebBatteryStatus&)>
BatteryUpdateCallbackList;
typedef BatteryUpdateCallbackList::Subscription BatteryUpdateSubscription;
// Returns the BatteryStatusService singleton.
static BatteryStatusService* GetInstance();
// Adds a callback to receive battery status updates.
// Must be called on the I/O thread.
scoped_ptr<BatteryUpdateSubscription> AddCallback(
const BatteryUpdateCallback& callback);
// Gracefully clean-up.
void Shutdown();
// Injects a custom battery status manager for testing purposes.
// This class takes ownership of the injected object.
void SetBatteryManagerForTesting(BatteryStatusManager* test_battery_manager);
// Returns callback to invoke when battery is changed. Used for testing.
const BatteryUpdateCallback& GetUpdateCallbackForTesting() const;
private:
friend struct DefaultSingletonTraits<BatteryStatusService>;
BatteryStatusService();
virtual ~BatteryStatusService();
// Updates current battery status and sends new status to interested
// render processes. Can be called on any thread via a callback.
void UpdateBatteryStatus(const blink::WebBatteryStatus& status);
void NotifyConsumers(const blink::WebBatteryStatus& status);
void ConsumersChanged();
scoped_ptr<BatteryStatusManager> battery_fetcher_;
BatteryUpdateCallbackList callback_list_;
BatteryUpdateCallback update_callback_;
blink::WebBatteryStatus status_;
bool status_updated_;
bool is_shutdown_;
DISALLOW_COPY_AND_ASSIGN(BatteryStatusService);
};
} // namespace content
#endif // CONTENT_BROWSER_BATTERY_STATUS_BATTERY_STATUS_SERVICE_H_
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