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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 "content/browser/battery_status/battery_status_service.h"
#include "base/bind.h"
#include "content/browser/battery_status/battery_status_manager.h"
#include "content/public/browser/browser_thread.h"
namespace content {
BatteryStatusService::BatteryStatusService()
: status_updated_(false),
is_shutdown_(false) {
update_callback_ = base::Bind(&BatteryStatusService::UpdateBatteryStatus,
base::Unretained(this));
callback_list_.set_removal_callback(
base::Bind(&BatteryStatusService::ConsumersChanged,
base::Unretained(this)));
}
BatteryStatusService::~BatteryStatusService() {
}
BatteryStatusService* BatteryStatusService::GetInstance() {
return Singleton<BatteryStatusService,
LeakySingletonTraits<BatteryStatusService> >::get();
}
scoped_ptr<BatteryStatusService::BatteryUpdateSubscription>
BatteryStatusService::AddCallback(const BatteryUpdateCallback& callback) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
DCHECK(!is_shutdown_);
if (!battery_fetcher_)
battery_fetcher_.reset(new BatteryStatusManager(update_callback_));
if (callback_list_.empty())
battery_fetcher_->StartListeningBatteryChange();
if (status_updated_) {
// Send recent status to the new callback if already available.
callback.Run(status_);
}
return callback_list_.Add(callback);
}
void BatteryStatusService::ConsumersChanged() {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
DCHECK(!is_shutdown_);
if (callback_list_.empty()) {
battery_fetcher_->StopListeningBatteryChange();
status_updated_ = false;
}
}
void BatteryStatusService::UpdateBatteryStatus(
const blink::WebBatteryStatus& status) {
DCHECK(!is_shutdown_);
BrowserThread::PostTask(BrowserThread::IO,
FROM_HERE,
base::Bind(&BatteryStatusService::NotifyConsumers,
base::Unretained(this), status));
}
void BatteryStatusService::NotifyConsumers(
const blink::WebBatteryStatus& status) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
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(
BatteryStatusManager* test_battery_manager) {
battery_fetcher_.reset(test_battery_manager);
blink::WebBatteryStatus status;
status_ = status;
status_updated_ = false;
}
} // namespace content
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