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// Copyright (c) 2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/system_monitor.h"
#include "base/logging.h"
#include "base/message_loop.h"
namespace base {
// The amount of time (in ms) to wait before running the initial
// battery check.
static int kDelayedBatteryCheckMs = 10 * 1000;
SystemMonitor::SystemMonitor()
: battery_in_use_(false),
suspended_(false) {
observer_list_ = new ObserverListThreadSafe<PowerObserver>();
}
void SystemMonitor::ProcessPowerMessage(PowerEvent event_id) {
// Suppress duplicate notifications. Some platforms may
// send multiple notifications of the same event.
switch (event_id) {
case POWER_STATE_EVENT:
{
bool on_battery = IsBatteryPower();
if (on_battery != battery_in_use_) {
battery_in_use_ = on_battery;
NotifyPowerStateChange();
}
}
break;
case RESUME_EVENT:
if (suspended_) {
suspended_ = false;
NotifyResume();
}
break;
case SUSPEND_EVENT:
if (!suspended_) {
suspended_ = true;
NotifySuspend();
}
break;
}
}
void SystemMonitor::AddObserver(PowerObserver* obs) {
observer_list_->AddObserver(obs);
}
void SystemMonitor::RemoveObserver(PowerObserver* obs) {
observer_list_->RemoveObserver(obs);
}
void SystemMonitor::NotifyPowerStateChange() {
LOG(INFO) << L"PowerStateChange: "
<< (BatteryPower() ? L"On" : L"Off") << L" battery";
observer_list_->Notify(&PowerObserver::OnPowerStateChange, this);
}
void SystemMonitor::NotifySuspend() {
LOG(INFO) << L"Power Suspending";
observer_list_->Notify(&PowerObserver::OnSuspend, this);
}
void SystemMonitor::NotifyResume() {
LOG(INFO) << L"Power Resuming";
observer_list_->Notify(&PowerObserver::OnResume, this);
}
void SystemMonitor::Start() {
DCHECK(MessageLoop::current()); // Can't call start too early.
SystemMonitor* monitor = Get();
monitor->delayed_battery_check_.Start(
TimeDelta::FromMilliseconds(kDelayedBatteryCheckMs), monitor,
&SystemMonitor::BatteryCheck);
}
void SystemMonitor::BatteryCheck() {
ProcessPowerMessage(SystemMonitor::POWER_STATE_EVENT);
}
} // namespace base
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