base/power_monitor/power_monitor.cc

   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
   3 // found in the LICENSE file.
   4
   5 #include "base/power_monitor/power_monitor.h"
   6 #include "base/power_monitor/power_monitor_source.h"
   7
   8 namespace base {
   9
  10 static PowerMonitor* g_power_monitor = NULL;
  11
  12 PowerMonitor::PowerMonitor(scoped_ptr<PowerMonitorSource> source)
  13     : observers_(new ObserverListThreadSafe<PowerObserver>()),
  14       source_(source.Pass()) {
  15   DCHECK(!g_power_monitor);
  16   g_power_monitor = this;
  17 }
  18
  19 PowerMonitor::~PowerMonitor() {
  20   DCHECK_EQ(this, g_power_monitor);
  21   g_power_monitor = NULL;
  22 }
  23
  24 // static
  25 PowerMonitor* PowerMonitor::Get() {
  26   return g_power_monitor;
  27 }
  28
  29 void PowerMonitor::AddObserver(PowerObserver* obs) {
  30   observers_->AddObserver(obs);
  31 }
  32
  33 void PowerMonitor::RemoveObserver(PowerObserver* obs) {
  34   observers_->RemoveObserver(obs);
  35 }
  36
  37 PowerMonitorSource* PowerMonitor::Source() {
  38   return source_.get();
  39 }
  40
  41 bool PowerMonitor::IsOnBatteryPower() {
  42   return source_->IsOnBatteryPower();
  43 }
  44
  45 void PowerMonitor::NotifyPowerStateChange(bool battery_in_use) {
  46   DVLOG(1) << "PowerStateChange: " << (battery_in_use ? "On" : "Off")
  47            << " battery";
  48   observers_->Notify(&PowerObserver::OnPowerStateChange, battery_in_use);
  49 }
  50
  51 void PowerMonitor::NotifySuspend() {
  52   DVLOG(1) << "Power Suspending";
  53   observers_->Notify(&PowerObserver::OnSuspend);
  54 }
  55
  56 void PowerMonitor::NotifyResume() {
  57   DVLOG(1) << "Power Resuming";
  58   observers_->Notify(&PowerObserver::OnResume);
  59 }
  60
  61 }  // namespace base