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| 1 // Copyright 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 "device/battery/battery_status_service.h" | |
| 6 | |
| 7 #include "base/bind.h" | |
| 8 #include "base/message_loop/message_loop.h" | |
| 9 #include "base/single_thread_task_runner.h" | |
| 10 #include "device/battery/battery_monitor_impl.h" | |
| 11 #include "device/battery/battery_status_manager.h" | |
| 12 | |
| 13 namespace device { | |
| 14 | |
| 15 BatteryStatusService::BatteryStatusService() | |
| 16 : main_thread_task_runner_(base::MessageLoop::current()->task_runner()), | |
| 17 update_callback_(base::Bind(&BatteryStatusService::NotifyConsumers, | |
| 18 base::Unretained(this))), | |
| 19 status_updated_(false), | |
| 20 is_shutdown_(false) { | |
| 21 callback_list_.set_removal_callback( | |
| 22 base::Bind(&BatteryStatusService::ConsumersChanged, | |
| 23 base::Unretained(this))); | |
| 24 } | |
| 25 | |
| 26 BatteryStatusService::~BatteryStatusService() { | |
| 27 } | |
| 28 | |
| 29 BatteryStatusService* BatteryStatusService::GetInstance() { | |
| 30 return Singleton<BatteryStatusService, | |
| 31 LeakySingletonTraits<BatteryStatusService> >::get(); | |
| 32 } | |
| 33 | |
| 34 scoped_ptr<BatteryStatusService::BatteryUpdateSubscription> | |
| 35 BatteryStatusService::AddCallback(const BatteryUpdateCallback& callback) { | |
| 36 DCHECK(main_thread_task_runner_->BelongsToCurrentThread()); | |
| 37 DCHECK(!is_shutdown_); | |
| 38 | |
| 39 if (!battery_fetcher_) | |
| 40 battery_fetcher_ = BatteryStatusManager::Create(update_callback_); | |
| 41 | |
| 42 if (callback_list_.empty()) { | |
| 43 bool success = battery_fetcher_->StartListeningBatteryChange(); | |
| 44 // On failure pass the default values back. | |
| 45 if (!success) | |
| 46 callback.Run(BatteryStatus()); | |
| 47 } | |
| 48 | |
| 49 if (status_updated_) { | |
| 50 // Send recent status to the new callback if already available. | |
| 51 callback.Run(status_); | |
| 52 } | |
| 53 | |
| 54 return callback_list_.Add(callback); | |
| 55 } | |
| 56 | |
| 57 void BatteryStatusService::ConsumersChanged() { | |
| 58 if (is_shutdown_) | |
| 59 return; | |
| 60 | |
| 61 if (callback_list_.empty()) { | |
| 62 battery_fetcher_->StopListeningBatteryChange(); | |
| 63 status_updated_ = false; | |
| 64 } | |
| 65 } | |
| 66 | |
| 67 void BatteryStatusService::NotifyConsumers(const BatteryStatus& status) { | |
| 68 DCHECK(!is_shutdown_); | |
| 69 | |
| 70 main_thread_task_runner_->PostTask(FROM_HERE, base::Bind( | |
| 71 &BatteryStatusService::NotifyConsumersOnMainThread, | |
| 72 base::Unretained(this), | |
| 73 status)); | |
| 74 } | |
| 75 | |
| 76 void BatteryStatusService::NotifyConsumersOnMainThread( | |
| 77 const BatteryStatus& status) { | |
| 78 DCHECK(main_thread_task_runner_->BelongsToCurrentThread()); | |
| 79 if (callback_list_.empty()) | |
| 80 return; | |
| 81 | |
| 82 status_ = status; | |
| 83 status_updated_ = true; | |
| 84 callback_list_.Notify(status_); | |
| 85 } | |
| 86 | |
| 87 void BatteryStatusService::Shutdown() { | |
| 88 if (!callback_list_.empty()) | |
| 89 battery_fetcher_->StopListeningBatteryChange(); | |
| 90 battery_fetcher_.reset(); | |
| 91 is_shutdown_ = true; | |
| 92 } | |
| 93 | |
| 94 const BatteryStatusService::BatteryUpdateCallback& | |
| 95 BatteryStatusService::GetUpdateCallbackForTesting() const { | |
| 96 return update_callback_; | |
| 97 } | |
| 98 | |
| 99 void BatteryStatusService::SetBatteryManagerForTesting( | |
| 100 scoped_ptr<BatteryStatusManager> test_battery_manager) { | |
| 101 battery_fetcher_ = test_battery_manager.Pass(); | |
| 102 status_ = BatteryStatus(); | |
| 103 status_updated_ = false; | |
| 104 } | |
| 105 | |
| 106 } // namespace device | |
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Chromium Code Reviews
Issue 676953005:
Revert of Replace Chrome IPC with Mojo IPC for querying BatteryStatus service (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master