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1 // Copyright 2013 The Chromium Authors. All rights reserved. | 1 // Copyright 2013 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef BASE_POWER_MONITOR_POWER_MONITOR_H_ | 5 #ifndef BASE_POWER_MONITOR_POWER_MONITOR_H_ |
6 #define BASE_POWER_MONITOR_POWER_MONITOR_H_ | 6 #define BASE_POWER_MONITOR_POWER_MONITOR_H_ |
7 | 7 |
8 #include "base/base_export.h" | 8 #include "base/base_export.h" |
9 #include "base/basictypes.h" | 9 #include "base/basictypes.h" |
10 #include "base/memory/ref_counted.h" | 10 #include "base/memory/ref_counted.h" |
11 #include "base/observer_list_threadsafe.h" | 11 #include "base/observer_list_threadsafe.h" |
12 #include "base/power_monitor/power_observer.h" | 12 #include "base/power_monitor/power_observer.h" |
| 13 #include "base/synchronization/lock.h" |
13 | 14 |
14 namespace base { | 15 namespace base { |
15 | 16 |
16 class PowerMonitorSource; | 17 class PowerMonitorSource; |
17 | 18 |
18 // A class used to monitor the power state change and notify the observers about | 19 // A class used to monitor the power state change and notify the observers about |
19 // the change event. | 20 // the change event. |
20 class BASE_EXPORT PowerMonitor { | 21 class BASE_EXPORT PowerMonitor { |
21 public: | 22 public: |
22 // Takes ownership of |source|. | 23 // Takes ownership of |source|. |
23 explicit PowerMonitor(scoped_ptr<PowerMonitorSource> source); | 24 static void Initialize(scoped_ptr<PowerMonitorSource> source); |
24 ~PowerMonitor(); | 25 static void ShutdownForTesting(); |
25 | 26 |
26 // Get the process-wide PowerMonitor (if not present, returns NULL). | 27 // Has the PowerMonitor already been initialized? |
27 static PowerMonitor* Get(); | 28 static bool IsInitialized(); |
28 | 29 |
29 // Add and remove an observer. | 30 // Add and remove an observer. |
30 // Can be called from any thread. | 31 // Can be called from any thread. |
31 // Must not be called from within a notification callback. | 32 // Must not be called from within a notification callback. |
32 void AddObserver(PowerObserver* observer); | 33 static bool AddObserver(PowerObserver* observer); |
33 void RemoveObserver(PowerObserver* observer); | 34 static bool RemoveObserver(PowerObserver* observer); |
34 | 35 |
35 // Is the computer currently on battery power. | 36 // Is the computer currently on battery power. |
36 bool IsOnBatteryPower(); | 37 static bool IsOnBatteryPower(); |
37 | 38 |
38 private: | 39 private: |
39 friend class PowerMonitorSource; | 40 friend class PowerMonitorSource; |
40 | 41 |
41 PowerMonitorSource* Source(); | 42 static Lock* GetLock(); |
42 | 43 // Must manually acquire lock before calling any of the following functions. |
43 void NotifyPowerStateChange(bool battery_in_use); | 44 static bool IsInitializedLocked(); |
44 void NotifySuspend(); | 45 static PowerMonitorSource* GetSource(); |
45 void NotifyResume(); | 46 static void NotifyPowerStateChange(bool battery_in_use); |
46 | 47 static void NotifySuspend(); |
47 scoped_refptr<ObserverListThreadSafe<PowerObserver> > observers_; | 48 static void NotifyResume(); |
48 scoped_ptr<PowerMonitorSource> source_; | |
49 | 49 |
50 DISALLOW_COPY_AND_ASSIGN(PowerMonitor); | 50 DISALLOW_COPY_AND_ASSIGN(PowerMonitor); |
51 }; | 51 }; |
52 | 52 |
53 } // namespace base | 53 } // namespace base |
54 | 54 |
55 #endif // BASE_POWER_MONITOR_POWER_MONITOR_H_ | 55 #endif // BASE_POWER_MONITOR_POWER_MONITOR_H_ |
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