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| 1 // Copyright (c) 2014 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 "content/browser/power_usage_monitor_impl.h" |
| 6 |
| 7 #include "base/bind.h" |
| 8 #include "base/logging.h" |
| 9 #include "base/macros.h" |
| 10 #include "base/message_loop/message_loop.h" |
| 11 #include "base/metrics/histogram.h" |
| 12 #include "base/strings/stringprintf.h" |
| 13 #include "base/time/time.h" |
| 14 #include "content/common/battery_status_messages.h" |
| 15 #include "content/public/browser/browser_thread.h" |
| 16 #include "content/public/browser/notification_service.h" |
| 17 #include "content/public/browser/notification_source.h" |
| 18 #include "content/public/browser/notification_types.h" |
| 19 #include "content/public/browser/power_usage_monitor.h" |
| 20 #include "content/public/browser/render_process_host.h" |
| 21 |
| 22 namespace content { |
| 23 |
| 24 void StartPowerUsageMonitor() { |
| 25 PowerUsageMonitor::GetInstance()->Initialize(); |
| 26 } |
| 27 |
| 28 PowerUsageMonitor::HistogramRecorder::HistogramRecorder() : |
| 29 weak_ptr_factory_(this) { |
| 30 } |
| 31 |
| 32 PowerUsageMonitor::HistogramRecorder::~HistogramRecorder() { |
| 33 } |
| 34 |
| 35 void PowerUsageMonitor::HistogramRecorder::CancelPendingHistgramReports() { |
| 36 weak_ptr_factory_.InvalidateWeakPtrs(); |
| 37 } |
| 38 |
| 39 void PowerUsageMonitor::HistogramRecorder::ReportBatteryLevelHistogram( |
| 40 base::TimeDelta discharge_time) { |
| 41 CHECK(BrowserThread::CurrentlyOn(BrowserThread::IO)); |
| 42 const std::string histogram_name = |
| 43 base::StringPrintf("Power.BatteryDischarge_%d", |
| 44 discharge_time.InMinutes()); |
| 45 base::HistogramBase* histogram = base::Histogram::FactoryGet( |
| 46 histogram_name, |
| 47 0, |
| 48 100, |
| 49 102, |
| 50 base::Histogram::kUmaTargetedHistogramFlag); |
| 51 double discharge_amount = |
| 52 PowerUsageMonitor::GetInstance()->DischargeAmount(); |
| 53 histogram->Add(discharge_amount * 100); |
| 54 |
| 55 PowerUsageMonitor::GetInstance()->BatteryLevelReported(); |
| 56 } |
| 57 |
| 58 |
| 59 PowerUsageMonitor::PowerUsageMonitor() : |
| 60 histogram_recorder_(new HistogramRecorder()), |
| 61 was_on_battery_power_(false), |
| 62 initial_battery_level_(0), |
| 63 current_battery_level_(0) { |
| 64 |
| 65 // PowerUsageMonitor gets battery level information. |
| 66 callback_ = base::Bind(&PowerUsageMonitor::OnBatteryStatusUpdate, |
| 67 base::Unretained(this)); |
| 68 |
| 69 // Power Monitor used to get suspend/resume notifications. |
| 70 base::PowerMonitor::Get()->AddObserver(this); |
| 71 |
| 72 registrar_.Add(this, |
| 73 NOTIFICATION_RENDERER_PROCESS_CREATED, |
| 74 NotificationService::AllBrowserContextsAndSources()); |
| 75 |
| 76 registrar_.Add(this, |
| 77 NOTIFICATION_RENDERER_PROCESS_TERMINATED, |
| 78 NotificationService::AllBrowserContextsAndSources()); |
| 79 registrar_.Add(this, |
| 80 NOTIFICATION_RENDERER_PROCESS_CLOSED, |
| 81 NotificationService::AllBrowserContextsAndSources()); |
| 82 } |
| 83 |
| 84 PowerUsageMonitor::~PowerUsageMonitor() { |
| 85 base::PowerMonitor::Get()->RemoveObserver(this); |
| 86 } |
| 87 |
| 88 PowerUsageMonitor* PowerUsageMonitor::GetInstance() { |
| 89 return Singleton<PowerUsageMonitor, |
| 90 LeakySingletonTraits<PowerUsageMonitor> >::get(); |
| 91 } |
| 92 |
| 93 void PowerUsageMonitor::Initialize() { |
| 94 const base::TimeDelta delay = base::TimeDelta::FromSeconds(1); |
| 95 |
| 96 BrowserThread::PostDelayedTask(BrowserThread::IO, |
| 97 FROM_HERE, base::Bind(&PowerUsageMonitor::StartOnIOThread, |
| 98 base::Unretained(this)), delay); |
| 99 } |
| 100 |
| 101 void PowerUsageMonitor::StartOnIOThread() { |
| 102 CHECK(BrowserThread::CurrentlyOn(BrowserThread::IO)); |
| 103 subscription_ = |
| 104 BatteryStatusService::GetInstance()->AddCallback(callback_); |
| 105 } |
| 106 |
| 107 void PowerUsageMonitor::DischargeStarted(double battery_level) { |
| 108 CHECK(BrowserThread::CurrentlyOn(BrowserThread::IO)); |
| 109 |
| 110 // Cancel any in-progress ReportBatteryLevelHistogram() calls. |
| 111 histogram_recorder_->CancelPendingHistgramReports(); |
| 112 |
| 113 // Rate-limit power recording to once every 24 hours. |
| 114 if (!first_histogram_report_timestamp_.is_null()) { |
| 115 base::TimeDelta time_since_last_report = |
| 116 base::Time::Now() - first_histogram_report_timestamp_; |
| 117 if (time_since_last_report.InHours() < 24) |
| 118 return; |
| 119 |
| 120 // More than 24 hours have passed, reset timestamp. |
| 121 first_histogram_report_timestamp_ = base::Time(); |
| 122 } |
| 123 |
| 124 was_on_battery_power_ = true; |
| 125 initial_battery_level_ = battery_level; |
| 126 current_battery_level_ = battery_level; |
| 127 start_discharge_time_ = base::Time::Now(); |
| 128 |
| 129 const int kBatteryReportingIntervalMinutes[] = {5, 15, 30}; |
| 130 |
| 131 for (size_t i = 0; i < arraysize(kBatteryReportingIntervalMinutes); ++i) { |
| 132 base::TimeDelta delay = |
| 133 base::TimeDelta::FromMinutes(kBatteryReportingIntervalMinutes[i]); |
| 134 BrowserThread::PostDelayedTask(BrowserThread::IO, |
| 135 FROM_HERE, base::Bind( |
| 136 &PowerUsageMonitor::HistogramRecorder::ReportBatteryLevelHistogram, |
| 137 histogram_recorder_->GetWeakPtr(), delay), delay); |
| 138 } |
| 139 } |
| 140 |
| 141 void PowerUsageMonitor::WallPowerConnected(double battery_level) { |
| 142 CHECK(BrowserThread::CurrentlyOn(BrowserThread::IO)); |
| 143 // Cancel any in-progress ReportBatteryLevelHistogram() calls. |
| 144 histogram_recorder_->CancelPendingHistgramReports(); |
| 145 |
| 146 if (!start_discharge_time_.is_null()) { |
| 147 base::TimeDelta discharge_time = base::Time::Now() - start_discharge_time_; |
| 148 double discharge_percent = initial_battery_level_ - battery_level; |
| 149 double discharge_rate = discharge_percent / discharge_time.InMinutes(); |
| 150 |
| 151 if (discharge_time.InMinutes() > 30) |
| 152 UMA_HISTOGRAM_PERCENTAGE("Power.BatteryDischargeRateWhenUnplugged", |
| 153 discharge_rate * 100.0); |
| 154 } |
| 155 |
| 156 was_on_battery_power_ = false; |
| 157 initial_battery_level_ = 0; |
| 158 current_battery_level_ = 0; |
| 159 start_discharge_time_ = base::Time(); |
| 160 } |
| 161 |
| 162 void PowerUsageMonitor::OnBatteryStatusUpdate( |
| 163 const blink::WebBatteryStatus& status) { |
| 164 CHECK(BrowserThread::CurrentlyOn(BrowserThread::IO)); |
| 165 |
| 166 bool now_on_battery_power = (status.charging == 0); |
| 167 double battery_level = status.level; |
| 168 |
| 169 if (now_on_battery_power == was_on_battery_power_) { |
| 170 if (now_on_battery_power) |
| 171 current_battery_level_ = battery_level; |
| 172 return; |
| 173 } else if (now_on_battery_power) { // Wall power disconnected. |
| 174 DischargeStarted(battery_level); |
| 175 } else { // Wall power connected. |
| 176 WallPowerConnected(battery_level); |
| 177 } |
| 178 } |
| 179 |
| 180 void PowerUsageMonitor::BatteryLevelReported() { |
| 181 if (first_histogram_report_timestamp_.is_null()) { |
| 182 // Record timestamp of first histogram report. |
| 183 first_histogram_report_timestamp_ = base::Time::Now(); |
| 184 } |
| 185 } |
| 186 |
| 187 void PowerUsageMonitor::SetHistogramRecorderForTest( |
| 188 scoped_ptr<HistogramRecorder> recorder) { |
| 189 histogram_recorder_ = recorder.Pass(); |
| 190 } |
| 191 |
| 192 void PowerUsageMonitor::OnSuspend() { |
| 193 BrowserThread::PostTask(BrowserThread::IO, |
| 194 FROM_HERE, |
| 195 base::Bind( |
| 196 &PowerUsageMonitor::CancelPendingHistogramRecordingOnIOThread, |
| 197 base::Unretained(this))); |
| 198 } |
| 199 |
| 200 void PowerUsageMonitor::Observe(int type, |
| 201 const NotificationSource& source, |
| 202 const NotificationDetails& details) { |
| 203 CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI)); |
| 204 |
| 205 RenderProcessHost* rph = |
| 206 Source<RenderProcessHost>(source).ptr(); |
| 207 |
| 208 size_t previous_num_live_renderers = live_renderers_.size(); |
| 209 |
| 210 if(type == NOTIFICATION_RENDERER_PROCESS_CREATED) { |
| 211 live_renderers_[rph->GetID()] = 1; |
| 212 } else if(type == NOTIFICATION_RENDERER_PROCESS_TERMINATED || |
| 213 type == NOTIFICATION_RENDERER_PROCESS_CLOSED) { |
| 214 live_renderers_.erase(rph->GetID()); |
| 215 } |
| 216 |
| 217 if (live_renderers_.size() == 0 && previous_num_live_renderers != 0) { |
| 218 // All render processes have died. |
| 219 BrowserThread::PostTask(BrowserThread::IO, |
| 220 FROM_HERE, |
| 221 base::Bind( |
| 222 &PowerUsageMonitor::CancelPendingHistogramRecordingOnIOThread, |
| 223 base::Unretained(this))); |
| 224 } |
| 225 } |
| 226 |
| 227 void PowerUsageMonitor::CancelPendingHistogramRecordingOnIOThread() { |
| 228 CHECK(BrowserThread::CurrentlyOn(BrowserThread::IO)); |
| 229 |
| 230 // Cancel any in-progress histogram reports and reporting of discharge UMA. |
| 231 histogram_recorder_->CancelPendingHistgramReports(); |
| 232 start_discharge_time_ = base::Time(); |
| 233 } |
| 234 |
| 235 } // namespace content |
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