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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/power_profiler/power_profiler_service.h"
#include "base/bind.h"
#include "base/message_loop/message_loop.h"
#include "base/threading/sequenced_worker_pool.h"
#include "content/public/browser/browser_thread.h"
namespace {
// Default sampling period, as recommended by Intel Power Gadget.
// Section 3.1 of http://software.intel.com/en-us/blogs/2013/10/03/using-the-intel-power-gadget-api-on-windows
const int kDefaultSamplePeriodMs = 50;
} // namespace
namespace content {
PowerProfilerService::PowerProfilerService()
: status_(UNINITIALIZED),
sample_period_(base::TimeDelta::FromMilliseconds(kDefaultSamplePeriodMs)),
data_provider_(PowerDataProvider::Create()) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
// No provider supported for current platform.
if (!data_provider_.get())
return;
status_ = INITIALIZED;
task_runner_ = BrowserThread::GetBlockingPool()->GetSequencedTaskRunner(
BrowserThread::GetBlockingPool()->GetSequenceToken());
}
PowerProfilerService::PowerProfilerService(
scoped_ptr<PowerDataProvider> provider,
scoped_refptr<base::TaskRunner> task_runner,
const base::TimeDelta& sample_period)
: task_runner_(task_runner),
status_(UNINITIALIZED),
sample_period_(sample_period),
data_provider_(provider.Pass()) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
if (data_provider_.get())
status_ = INITIALIZED;
}
PowerProfilerService::~PowerProfilerService() {
}
bool PowerProfilerService::IsAvailable() {
return status_ != UNINITIALIZED;
}
PowerProfilerService* PowerProfilerService::GetInstance() {
return Singleton<PowerProfilerService>::get();
}
void PowerProfilerService::AddObserver(PowerProfilerObserver* observer) {
if (status_ == UNINITIALIZED)
return;
observers_.AddObserver(observer);
if (status_ != PROFILING)
Start();
}
void PowerProfilerService::RemoveObserver(PowerProfilerObserver* observer) {
observers_.RemoveObserver(observer);
if (!observers_.might_have_observers())
Stop();
}
void PowerProfilerService::Start() {
DCHECK(status_ == INITIALIZED);
status_ = PROFILING;
// Send out power events immediately.
QueryData();
query_power_timer_.Start(FROM_HERE,
sample_period_, this, &PowerProfilerService::QueryData);
}
void PowerProfilerService::Stop() {
DCHECK(status_ == PROFILING);
query_power_timer_.Stop();
status_ = INITIALIZED;
}
void PowerProfilerService::QueryData() {
task_runner_->PostTask(
FROM_HERE, base::Bind(&PowerProfilerService::QueryDataOnTaskRunner,
base::Unretained(this)));
}
void PowerProfilerService::Notify(const PowerEventVector& events) {
FOR_EACH_OBSERVER(PowerProfilerObserver, observers_, OnPowerEvent(events));
}
void PowerProfilerService::QueryDataOnTaskRunner() {
DCHECK(task_runner_->RunsTasksOnCurrentThread());
DCHECK(status_ == PROFILING);
// Get data and notify.
PowerEventVector events = data_provider_->GetData();
if (events.size() != 0) {
BrowserThread::PostTask(BrowserThread::UI, FROM_HERE, base::Bind(
&PowerProfilerService::Notify, base::Unretained(this), events));
}
}
} // namespace content
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