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| 1 // Copyright (c) 2011 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 BASE_SYSTEM_MONITOR_SYSTEM_MONITOR_H_ | |
| 6 #define BASE_SYSTEM_MONITOR_SYSTEM_MONITOR_H_ | |
| 7 #pragma once | |
| 8 | |
| 9 #include "base/basictypes.h" | |
| 10 #include "build/build_config.h" | |
| 11 | |
| 12 // Windows HiRes timers drain the battery faster so we need to know the battery | |
| 13 // status. This isn't true for other platforms. | |
| 14 #if defined(OS_WIN) | |
| 15 #define ENABLE_BATTERY_MONITORING 1 | |
| 16 #else | |
| 17 #undef ENABLE_BATTERY_MONITORING | |
| 18 #endif // !OS_WIN | |
| 19 | |
| 20 #include "base/observer_list_threadsafe.h" | |
| 21 #if defined(ENABLE_BATTERY_MONITORING) | |
| 22 #include "base/timer.h" | |
| 23 #endif // defined(ENABLE_BATTERY_MONITORING) | |
| 24 | |
| 25 #if defined(OS_MACOSX) | |
| 26 #include <IOKit/pwr_mgt/IOPMLib.h> | |
| 27 #include <IOKit/IOMessage.h> | |
| 28 #endif // OS_MACOSX | |
| 29 | |
| 30 namespace base { | |
| 31 | |
| 32 // Class for monitoring various system-related subsystems | |
| 33 // such as power management, network status, etc. | |
| 34 // TODO(mbelshe): Add support beyond just power management. | |
| 35 class SystemMonitor { | |
| 36 public: | |
| 37 // Normalized list of power events. | |
| 38 enum PowerEvent { | |
| 39 POWER_STATE_EVENT, // The Power status of the system has changed. | |
| 40 SUSPEND_EVENT, // The system is being suspended. | |
| 41 RESUME_EVENT // The system is being resumed. | |
| 42 }; | |
| 43 | |
| 44 // Create SystemMonitor. Only one SystemMonitor instance per application | |
| 45 // is allowed. | |
| 46 SystemMonitor(); | |
| 47 ~SystemMonitor(); | |
| 48 | |
| 49 // Get the application-wide SystemMonitor (if not present, returns NULL). | |
| 50 static SystemMonitor* Get(); | |
| 51 | |
| 52 // | |
| 53 // Power-related APIs | |
| 54 // | |
| 55 | |
| 56 // Is the computer currently on battery power. | |
| 57 // Can be called on any thread. | |
| 58 bool BatteryPower() const { | |
| 59 // Using a lock here is not necessary for just a bool. | |
| 60 return battery_in_use_; | |
| 61 } | |
| 62 | |
| 63 // Callbacks will be called on the thread which creates the SystemMonitor. | |
| 64 // During the callback, Add/RemoveObserver will block until the callbacks | |
| 65 // are finished. Observers should implement quick callback functions; if | |
| 66 // lengthy operations are needed, the observer should take care to invoke | |
| 67 // the operation on an appropriate thread. | |
| 68 class PowerObserver { | |
| 69 public: | |
| 70 // Notification of a change in power status of the computer, such | |
| 71 // as from switching between battery and A/C power. | |
| 72 virtual void OnPowerStateChange(bool on_battery_power) {} | |
| 73 | |
| 74 // Notification that the system is suspending. | |
| 75 virtual void OnSuspend() {} | |
| 76 | |
| 77 // Notification that the system is resuming. | |
| 78 virtual void OnResume() {} | |
| 79 | |
| 80 protected: | |
| 81 virtual ~PowerObserver() {} | |
| 82 }; | |
| 83 | |
| 84 // Add a new observer. | |
| 85 // Can be called from any thread. | |
| 86 // Must not be called from within a notification callback. | |
| 87 void AddObserver(PowerObserver* obs); | |
| 88 | |
| 89 // Remove an existing observer. | |
| 90 // Can be called from any thread. | |
| 91 // Must not be called from within a notification callback. | |
| 92 void RemoveObserver(PowerObserver* obs); | |
| 93 | |
| 94 #if defined(OS_WIN) | |
| 95 // Windows-specific handling of a WM_POWERBROADCAST message. | |
| 96 // Embedders of this API should hook their top-level window | |
| 97 // message loop and forward WM_POWERBROADCAST through this call. | |
| 98 void ProcessWmPowerBroadcastMessage(int event_id); | |
| 99 #endif | |
| 100 | |
| 101 // Cross-platform handling of a power event. | |
| 102 void ProcessPowerMessage(PowerEvent event_id); | |
| 103 | |
| 104 private: | |
| 105 #if defined(OS_MACOSX) | |
| 106 void PlatformInit(); | |
| 107 void PlatformDestroy(); | |
| 108 #endif | |
| 109 | |
| 110 // Platform-specific method to check whether the system is currently | |
| 111 // running on battery power. Returns true if running on batteries, | |
| 112 // false otherwise. | |
| 113 bool IsBatteryPower(); | |
| 114 | |
| 115 // Checks the battery status and notifies observers if the battery | |
| 116 // status has changed. | |
| 117 void BatteryCheck(); | |
| 118 | |
| 119 // Functions to trigger notifications. | |
| 120 void NotifyPowerStateChange(); | |
| 121 void NotifySuspend(); | |
| 122 void NotifyResume(); | |
| 123 | |
| 124 scoped_refptr<ObserverListThreadSafe<PowerObserver> > observer_list_; | |
| 125 bool battery_in_use_; | |
| 126 bool suspended_; | |
| 127 | |
| 128 #if defined(ENABLE_BATTERY_MONITORING) | |
| 129 base::OneShotTimer<SystemMonitor> delayed_battery_check_; | |
| 130 #endif | |
| 131 | |
| 132 #if defined(OS_MACOSX) | |
| 133 IONotificationPortRef notification_port_ref_; | |
| 134 io_object_t notifier_object_; | |
| 135 #endif | |
| 136 | |
| 137 DISALLOW_COPY_AND_ASSIGN(SystemMonitor); | |
| 138 }; | |
| 139 | |
| 140 } // namespace base | |
| 141 | |
| 142 #endif // BASE_SYSTEM_MONITOR_SYSTEM_MONITOR_H_ | |
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Chromium Code Reviews
Issue 7042003:
Revert 85732 (broke build) - Move SystemMonitor to base/. (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src/