Upstream version 5.34.92.0
[platform/framework/web/crosswalk.git] / src / chromeos / power / power_data_collector.cc
1 // Copyright 2013 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 "chromeos/power/power_data_collector.h"
6
7 #include "base/logging.h"
8 #include "chromeos/dbus/dbus_thread_manager.h"
9 #include "chromeos/dbus/power_manager/power_supply_properties.pb.h"
10
11 namespace chromeos {
12
13 namespace {
14
15 // The global PowerDataCollector instance.
16 PowerDataCollector* g_power_data_collector = NULL;
17
18 }  // namespace
19
20 const int PowerDataCollector::kSampleTimeLimitSec = 24 * 60 * 60;
21
22 // static
23 void PowerDataCollector::Initialize() {
24   // Check that power data collector is initialized only after the
25   // DBusThreadManager is initialized.
26   CHECK(DBusThreadManager::Get());
27   CHECK(g_power_data_collector == NULL);
28   g_power_data_collector = new PowerDataCollector();
29 }
30
31 // static
32 void PowerDataCollector::Shutdown() {
33   // Shutdown only if initialized.
34   CHECK(g_power_data_collector);
35   delete g_power_data_collector;
36   g_power_data_collector = NULL;
37 }
38
39 // static
40 PowerDataCollector* PowerDataCollector::Get() {
41   CHECK(g_power_data_collector);
42   return g_power_data_collector;
43 }
44
45 void PowerDataCollector::PowerChanged(
46     const power_manager::PowerSupplyProperties& prop) {
47   PowerSupplySnapshot snapshot;
48   snapshot.time = base::TimeTicks::Now();
49   snapshot.external_power = (prop.external_power() !=
50       power_manager::PowerSupplyProperties::DISCONNECTED);
51   snapshot.battery_percent = prop.battery_percent();
52   snapshot.battery_discharge_rate = prop.battery_discharge_rate();
53   AddSnapshot(snapshot);
54 }
55
56 PowerDataCollector::PowerDataCollector() {
57   DBusThreadManager::Get()->GetPowerManagerClient()->AddObserver(this);
58 }
59
60 PowerDataCollector::~PowerDataCollector() {
61   DBusThreadManager* dbus_manager = DBusThreadManager::Get();
62   CHECK(dbus_manager);
63   dbus_manager->GetPowerManagerClient()->RemoveObserver(this);
64 }
65
66 void PowerDataCollector::AddSnapshot(const PowerSupplySnapshot& snapshot) {
67   while (!power_supply_data_.empty()) {
68     const PowerSupplySnapshot& first = power_supply_data_.front();
69     if (snapshot.time - first.time >
70         base::TimeDelta::FromSeconds(kSampleTimeLimitSec)) {
71       power_supply_data_.pop_front();
72     } else {
73       break;
74     }
75   }
76   power_supply_data_.push_back(snapshot);
77 }
78
79 PowerDataCollector::PowerSupplySnapshot::PowerSupplySnapshot()
80     : time(base::TimeTicks::Now()),
81       external_power(false),
82       battery_percent(0),
83       battery_discharge_rate(0.0) {
84 }
85
86 }  // namespace chromeos