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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "device/battery/battery_status_service.h"
#include <utility>
#include "base/bind.h"
#include "base/message_loop/message_loop.h"
#include "base/single_thread_task_runner.h"
#include "device/battery/battery_monitor_impl.h"
#include "device/battery/battery_status_manager.h"
namespace device {
BatteryStatusService::BatteryStatusService()
: main_thread_task_runner_(base::MessageLoop::current()->task_runner()),
update_callback_(base::Bind(&BatteryStatusService::NotifyConsumers,
base::Unretained(this))),
status_updated_(false),
is_shutdown_(false) {
callback_list_.set_removal_callback(
base::Bind(&BatteryStatusService::ConsumersChanged,
base::Unretained(this)));
}
BatteryStatusService::~BatteryStatusService() {
}
BatteryStatusService* BatteryStatusService::GetInstance() {
return base::Singleton<
BatteryStatusService,
base::LeakySingletonTraits<BatteryStatusService>>::get();
}
scoped_ptr<BatteryStatusService::BatteryUpdateSubscription>
BatteryStatusService::AddCallback(const BatteryUpdateCallback& callback) {
DCHECK(main_thread_task_runner_->BelongsToCurrentThread());
DCHECK(!is_shutdown_);
if (!battery_fetcher_)
battery_fetcher_ = BatteryStatusManager::Create(update_callback_);
if (callback_list_.empty()) {
bool success = battery_fetcher_->StartListeningBatteryChange();
// On failure pass the default values back.
if (!success)
callback.Run(BatteryStatus());
}
if (status_updated_) {
// Send recent status to the new callback if already available.
callback.Run(status_);
}
return callback_list_.Add(callback);
}
void BatteryStatusService::ConsumersChanged() {
if (is_shutdown_)
return;
if (callback_list_.empty()) {
battery_fetcher_->StopListeningBatteryChange();
status_updated_ = false;
}
}
void BatteryStatusService::NotifyConsumers(const BatteryStatus& status) {
DCHECK(!is_shutdown_);
main_thread_task_runner_->PostTask(FROM_HERE, base::Bind(
&BatteryStatusService::NotifyConsumersOnMainThread,
base::Unretained(this),
status));
}
void BatteryStatusService::NotifyConsumersOnMainThread(
const BatteryStatus& status) {
DCHECK(main_thread_task_runner_->BelongsToCurrentThread());
if (callback_list_.empty())
return;
status_ = status;
status_updated_ = true;
callback_list_.Notify(status_);
}
void BatteryStatusService::Shutdown() {
if (!callback_list_.empty())
battery_fetcher_->StopListeningBatteryChange();
battery_fetcher_.reset();
is_shutdown_ = true;
}
const BatteryStatusService::BatteryUpdateCallback&
BatteryStatusService::GetUpdateCallbackForTesting() const {
return update_callback_;
}
void BatteryStatusService::SetBatteryManagerForTesting(
scoped_ptr<BatteryStatusManager> test_battery_manager) {
battery_fetcher_ = std::move(test_battery_manager);
status_ = BatteryStatus();
status_updated_ = false;
}
} // namespace device
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