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Issue 4288: Make the SystemMonitor observer list thread safe.... (Closed) Base URL: svn://chrome-svn/chrome/trunk/src/
Patch Set: '' Created 12 years, 1 month ago
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1 // Copyright (c) 2008 The Chromium Authors. All rights reserved. 1 // Copyright (c) 2008 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #include "base/system_monitor.h" 5 #include "base/system_monitor.h"
6 #include "base/logging.h"
7 #include "base/message_loop.h"
6 8
7 namespace base { 9 namespace base {
8 10
11 // The amount of time (in ms) to wait before running the initial
12 // battery check.
13 static int kDelayedBatteryCheckMs = 10 * 1000;
14
9 SystemMonitor::SystemMonitor() 15 SystemMonitor::SystemMonitor()
10 : battery_in_use_(IsBatteryPower()), 16 : battery_in_use_(false),
11 suspended_(false) { 17 suspended_(false) {
18 observer_list_ = new ObserverListThreadSafe<PowerObserver>();
12 } 19 }
13 20
14 void SystemMonitor::ProcessPowerMessage(PowerEvent event_id) { 21 void SystemMonitor::ProcessPowerMessage(PowerEvent event_id) {
15 // Suppress duplicate notifications. Some platforms may 22 // Suppress duplicate notifications. Some platforms may
16 // send multiple notifications of the same event. 23 // send multiple notifications of the same event.
17 switch (event_id) { 24 switch (event_id) {
18 case PowerStateEvent: 25 case POWER_STATE_EVENT:
19 { 26 {
20 bool on_battery = IsBatteryPower(); 27 bool on_battery = IsBatteryPower();
21 if (on_battery != battery_in_use_) { 28 if (on_battery != battery_in_use_) {
22 battery_in_use_ = on_battery; 29 battery_in_use_ = on_battery;
23 NotifyPowerStateChange(); 30 NotifyPowerStateChange();
24 } 31 }
25 } 32 }
26 break; 33 break;
27 case ResumeEvent: 34 case RESUME_EVENT:
28 if (suspended_) { 35 if (suspended_) {
29 suspended_ = false; 36 suspended_ = false;
30 NotifyResume(); 37 NotifyResume();
31 } 38 }
32 break; 39 break;
33 case SuspendEvent: 40 case SUSPEND_EVENT:
34 if (!suspended_) { 41 if (!suspended_) {
35 suspended_ = true; 42 suspended_ = true;
36 NotifySuspend(); 43 NotifySuspend();
37 } 44 }
38 break; 45 break;
39 } 46 }
40 } 47 }
41 48
49 void SystemMonitor::AddObserver(PowerObserver* obs) {
50 observer_list_->AddObserver(obs);
51 }
52
53 void SystemMonitor::RemoveObserver(PowerObserver* obs) {
54 observer_list_->RemoveObserver(obs);
55 }
56
57 void SystemMonitor::NotifyPowerStateChange() {
58 LOG(INFO) << L"PowerStateChange: "
59 << (BatteryPower() ? L"On" : L"Off") << L" battery";
60 observer_list_->Notify(&PowerObserver::OnPowerStateChange, this);
61 }
62
63 void SystemMonitor::NotifySuspend() {
64 LOG(INFO) << L"Power Suspending";
65 observer_list_->Notify(&PowerObserver::OnSuspend, this);
66 }
67
68 void SystemMonitor::NotifyResume() {
69 LOG(INFO) << L"Power Resuming";
70 observer_list_->Notify(&PowerObserver::OnResume, this);
71 }
72
73 void SystemMonitor::Start() {
74 SystemMonitor* monitor = Get();
75 monitor->delayed_battery_check_.Start(
76 TimeDelta::FromMilliseconds(kDelayedBatteryCheckMs), monitor,
77 &SystemMonitor::BatteryCheck);
78 }
79
80 void SystemMonitor::BatteryCheck() {
81 ProcessPowerMessage(SystemMonitor::POWER_STATE_EVENT);
82 }
83
42 } // namespace base 84 } // namespace base
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