1 // Copyright 2020 The Chromium Authors 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 BASE_TASK_SEQUENCE_MANAGER_THREAD_CONTROLLER_POWER_MONITOR_H_ 6 #define BASE_TASK_SEQUENCE_MANAGER_THREAD_CONTROLLER_POWER_MONITOR_H_ 7 8 #include "base/base_export.h" 9 #include "base/power_monitor/power_observer.h" 10 11 namespace base { 12 namespace sequence_manager { 13 namespace internal { 14 15 // A helper class that keeps track of the power state and handles power 16 // notifications. The class register itself to the PowerMonitor and receives 17 // notifications on the bound thread (see BindToCurrentThread(...)). 18 class BASE_EXPORT ThreadControllerPowerMonitor : public PowerSuspendObserver { 19 public: 20 ThreadControllerPowerMonitor(); 21 ~ThreadControllerPowerMonitor() override; 22 ThreadControllerPowerMonitor(const ThreadControllerPowerMonitor&) = delete; 23 ThreadControllerPowerMonitor& operator=(const ThreadControllerPowerMonitor&) = 24 delete; 25 26 // Register this class to the power monitor to receive notifications on this 27 // thread. It is safe to call this before PowerMonitor is initialized. 28 void BindToCurrentThread(); 29 30 // Returns whether the process is between power suspend and resume 31 // notifications. 32 bool IsProcessInPowerSuspendState(); 33 34 // Initialize the ThreadControllerPowerMonitor. Must be called once on the 35 // main thread during startup while single-threaded. 36 static void InitializeOnMainThread(); 37 38 static void OverrideUsePowerMonitorForTesting(bool use_power_monitor); 39 static void ResetForTesting(); 40 41 // base::PowerSuspendObserver: 42 void OnSuspend() override; 43 void OnResume() override; 44 45 private: 46 // Power state based on notifications delivered to this observer. 47 bool is_power_suspended_ = false; 48 49 // Whether PowerMonitor observer is registered. 50 bool is_observer_registered_ = false; 51 }; 52 53 } // namespace internal 54 } // namespace sequence_manager 55 } // namespace base 56 57 #endif // BASE_TASK_SEQUENCE_MANAGER_THREAD_CONTROLLER_POWER_MONITOR_H_ 58