1 // Copyright 2014 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef CONTENT_BROWSER_BATTERY_STATUS_BATTERY_STATUS_SERVICE_H_ 6 #define CONTENT_BROWSER_BATTERY_STATUS_BATTERY_STATUS_SERVICE_H_ 7 8 #include "base/callback_list.h" 9 #include "base/memory/singleton.h" 10 #include "content/common/content_export.h" 11 #include "third_party/WebKit/public/platform/WebBatteryStatus.h" 12 13 namespace content { 14 class BatteryStatusManager; 15 16 class CONTENT_EXPORT BatteryStatusService { 17 public: 18 typedef base::Callback<void(const blink::WebBatteryStatus&)> 19 BatteryUpdateCallback; 20 typedef base::CallbackList<void(const blink::WebBatteryStatus&)> 21 BatteryUpdateCallbackList; 22 typedef BatteryUpdateCallbackList::Subscription BatteryUpdateSubscription; 23 24 // Returns the BatteryStatusService singleton. 25 static BatteryStatusService* GetInstance(); 26 27 // Adds a callback to receive battery status updates. 28 // Must be called on the I/O thread. 29 scoped_ptr<BatteryUpdateSubscription> AddCallback( 30 const BatteryUpdateCallback& callback); 31 32 // Gracefully clean-up. 33 void Shutdown(); 34 35 // Injects a custom battery status manager for testing purposes. 36 // This class takes ownership of the injected object. 37 void SetBatteryManagerForTesting(BatteryStatusManager* test_battery_manager); 38 39 // Returns callback to invoke when battery is changed. Used for testing. 40 const BatteryUpdateCallback& GetUpdateCallbackForTesting() const; 41 42 private: 43 friend struct DefaultSingletonTraits<BatteryStatusService>; 44 45 BatteryStatusService(); 46 virtual ~BatteryStatusService(); 47 48 // Updates current battery status and sends new status to interested 49 // render processes. Can be called on any thread via a callback. 50 void UpdateBatteryStatus(const blink::WebBatteryStatus& status); 51 void NotifyConsumers(const blink::WebBatteryStatus& status); 52 void ConsumersChanged(); 53 54 scoped_ptr<BatteryStatusManager> battery_fetcher_; 55 BatteryUpdateCallbackList callback_list_; 56 BatteryUpdateCallback update_callback_; 57 blink::WebBatteryStatus status_; 58 bool status_updated_; 59 bool is_shutdown_; 60 61 DISALLOW_COPY_AND_ASSIGN(BatteryStatusService); 62 }; 63 64 } // namespace content 65 66 #endif // CONTENT_BROWSER_BATTERY_STATUS_BATTERY_STATUS_SERVICE_H_ 67
