1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/ipc/chromium/src/base/system_monitor.cc Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,89 @@
1.4 +// Copyright (c) 2008 The Chromium Authors. All rights reserved.
1.5 +// Use of this source code is governed by a BSD-style license that can be
1.6 +// found in the LICENSE file.
1.7 +
1.8 +#include "base/system_monitor.h"
1.9 +#include "base/logging.h"
1.10 +#include "base/message_loop.h"
1.11 +
1.12 +namespace base {
1.13 +
1.14 +#if defined(ENABLE_BATTERY_MONITORING)
1.15 +// The amount of time (in ms) to wait before running the initial
1.16 +// battery check.
1.17 +static int kDelayedBatteryCheckMs = 10 * 1000;
1.18 +#endif // defined(ENABLE_BATTERY_MONITORING)
1.19 +
1.20 +SystemMonitor::SystemMonitor()
1.21 + : battery_in_use_(false),
1.22 + suspended_(false) {
1.23 + observer_list_ = new ObserverListThreadSafe<PowerObserver>();
1.24 +}
1.25 +
1.26 +void SystemMonitor::ProcessPowerMessage(PowerEvent event_id) {
1.27 + // Suppress duplicate notifications. Some platforms may
1.28 + // send multiple notifications of the same event.
1.29 + switch (event_id) {
1.30 + case POWER_STATE_EVENT:
1.31 + {
1.32 + bool on_battery = IsBatteryPower();
1.33 + if (on_battery != battery_in_use_) {
1.34 + battery_in_use_ = on_battery;
1.35 + NotifyPowerStateChange();
1.36 + }
1.37 + }
1.38 + break;
1.39 + case RESUME_EVENT:
1.40 + if (suspended_) {
1.41 + suspended_ = false;
1.42 + NotifyResume();
1.43 + }
1.44 + break;
1.45 + case SUSPEND_EVENT:
1.46 + if (!suspended_) {
1.47 + suspended_ = true;
1.48 + NotifySuspend();
1.49 + }
1.50 + break;
1.51 + }
1.52 +}
1.53 +
1.54 +void SystemMonitor::AddObserver(PowerObserver* obs) {
1.55 + observer_list_->AddObserver(obs);
1.56 +}
1.57 +
1.58 +void SystemMonitor::RemoveObserver(PowerObserver* obs) {
1.59 + observer_list_->RemoveObserver(obs);
1.60 +}
1.61 +
1.62 +void SystemMonitor::NotifyPowerStateChange() {
1.63 + CHROMIUM_LOG(INFO) << "PowerStateChange: "
1.64 + << (BatteryPower() ? "On" : "Off") << " battery";
1.65 + observer_list_->Notify(&PowerObserver::OnPowerStateChange, this);
1.66 +}
1.67 +
1.68 +void SystemMonitor::NotifySuspend() {
1.69 + CHROMIUM_LOG(INFO) << "Power Suspending";
1.70 + observer_list_->Notify(&PowerObserver::OnSuspend, this);
1.71 +}
1.72 +
1.73 +void SystemMonitor::NotifyResume() {
1.74 + CHROMIUM_LOG(INFO) << "Power Resuming";
1.75 + observer_list_->Notify(&PowerObserver::OnResume, this);
1.76 +}
1.77 +
1.78 +void SystemMonitor::Start() {
1.79 +#if defined(ENABLE_BATTERY_MONITORING)
1.80 + DCHECK(MessageLoop::current()); // Can't call start too early.
1.81 + SystemMonitor* monitor = Get();
1.82 + monitor->delayed_battery_check_.Start(
1.83 + TimeDelta::FromMilliseconds(kDelayedBatteryCheckMs), monitor,
1.84 + &SystemMonitor::BatteryCheck);
1.85 +#endif // defined(ENABLE_BATTERY_MONITORING)
1.86 +}
1.87 +
1.88 +void SystemMonitor::BatteryCheck() {
1.89 + ProcessPowerMessage(SystemMonitor::POWER_STATE_EVENT);
1.90 +}
1.91 +
1.92 +} // namespace base
