Index: content/browser/power_usage_monitor_impl.h |
diff --git a/content/browser/power_usage_monitor_impl.h b/content/browser/power_usage_monitor_impl.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..26770b86985094fcfe70c6eb3b41e3ed5e32b029 |
--- /dev/null |
+++ b/content/browser/power_usage_monitor_impl.h |
@@ -0,0 +1,120 @@ |
+// Copyright (c) 2014 The Chromium Authors. All rights reserved. |
Daniel Erat
2014/09/22 16:10:20
nit: we don't use (c) on new files
jeremy
2014/09/29 06:27:15
Done.
|
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+#ifndef CHROME_CONTENT_BROWSER_POWER_USAGE_MONITOR_IMPL_H_ |
+#define CHROME_CONTENT_BROWSER_POWER_USAGE_MONITOR_IMPL_H_ |
+ |
+#include "base/basictypes.h" |
+#include "base/containers/hash_tables.h" |
+#include "base/memory/singleton.h" |
+#include "base/power_monitor/power_monitor.h" |
+#include "base/time/time.h" |
+#include "content/browser/battery_status/battery_status_service.h" |
+#include "content/public/browser/browser_message_filter.h" |
+#include "content/public/browser/notification_observer.h" |
+#include "content/public/browser/notification_registrar.h" |
+#include "third_party/WebKit/public/platform/WebBatteryStatus.h" |
+ |
+namespace content { |
+ |
+// Record statistics on power usage. |
+// |
+// Two main statics are recorded by this class: |
+// * Power.BatteryDischarge_{5,15,30} - delta between battery level when |
+// unplugged from wallpower, over the specified period - in minutes. |
+// * Power.BatteryDischargeRateWhenUnplugged - the rate of battery discharge |
+// from the device being unplugged until it's plugged back in, if said period |
+// was longer than 30 minutes. |
+// |
+// Heuristics: |
+// * Metrics are only collected once per day. |
+// * If the machine goes to sleep or all renderers are closed then the current |
+// measurement is cancelled. |
+// |
+// Threading: Most methods are called on the IO thread. |
+class PowerUsageMonitor : base::PowerObserver, NotificationObserver { |
+ public: |
+ class HistogramRecorder { |
+ public: |
+ HistogramRecorder(); |
+ virtual ~HistogramRecorder(); |
+ |
+ virtual void ReportBatteryLevelHistogram(base::TimeDelta discharge_time); |
+ |
+ void CancelPendingHistgramReports(); |
+ base::WeakPtr<HistogramRecorder> GetWeakPtr() { |
+ return weak_ptr_factory_.GetWeakPtr(); |
+ } |
+ |
+ // Used to cancel in progress timers. |
+ base::WeakPtrFactory<HistogramRecorder> weak_ptr_factory_; |
+ }; |
+ |
+ public: |
+ // Returns the PowerUsageMonitor singleton. |
+ static PowerUsageMonitor* GetInstance(); |
+ |
+ // Start monitoring power usage. |
+ void Initialize(); |
+ void StartOnIOThread(); |
+ |
+ void OnBatteryStatusUpdate(const blink::WebBatteryStatus& status); |
+ |
+ double DischargeAmount() { |
+ return initial_battery_level_ - current_battery_level_; |
+ } |
+ |
+ // Called by HistogramRecorder after a histogram was succesfully recorded. |
+ void BatteryLevelReported(); |
+ |
+ void SetHistogramRecorderForTest(scoped_ptr<HistogramRecorder> recorder); |
+ |
+ // POverridden from basde::PowerObserver: |
+ virtual void OnPowerStateChange(bool on_battery_power) OVERRIDE {}; |
+ virtual void OnResume() OVERRIDE {}; |
+ virtual void OnSuspend() OVERRIDE; |
+ |
+ // Overridden from NotificationObserver: |
+ virtual void Observe(int type, |
+ const NotificationSource& source, |
+ const NotificationDetails& details) OVERRIDE; |
+ |
+ |
+ private: |
+ friend struct DefaultSingletonTraits<PowerUsageMonitor>; |
+ |
+ PowerUsageMonitor(); |
+ virtual ~PowerUsageMonitor(); |
+ |
+ void ReportBatteryLevelHistogram(base::Time discharge_time); |
+ void DischargeStarted(double battery_level); |
+ void WallPowerConnected(double battery_level); |
+ |
+ void CancelPendingHistogramRecordingOnIOThread(); |
+ |
+ BatteryStatusService::BatteryUpdateCallback callback_; |
+ scoped_ptr<BatteryStatusService::BatteryUpdateSubscription> subscription_; |
+ |
+ NotificationRegistrar registrar_; |
+ |
+ scoped_ptr<HistogramRecorder> histogram_recorder_; |
+ |
+ bool was_on_battery_power_; |
+ double initial_battery_level_; |
+ double current_battery_level_; |
+ base::Time start_discharge_time_; |
+ |
+ // Timestamp for when the first histogram is reported in a 24 hour period. |
+ // Used for rate-limiting. |
+ base::Time first_histogram_report_timestamp_; |
+ |
+ base::hash_map<int, int> live_renderers_; |
Daniel Erat
2014/09/22 16:10:20
any particular reason to use base::hash_map here i
jeremy
2014/09/29 06:27:15
I've changed this to base::hash_set since that's a
|
+ |
+ private: |
+ DISALLOW_COPY_AND_ASSIGN(PowerUsageMonitor); |
+}; |
+ |
+} // namespace content |
+ |
+#endif // CHROME_CONTENT_BROWSER_POWER_USAGE_MONITOR_IMPL_H_ |