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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.
#ifndef CONTENT_BROWSER_POWER_PROFILER_POWER_PROFILER_SERVICE_H_
#define CONTENT_BROWSER_POWER_PROFILER_POWER_PROFILER_SERVICE_H_
#include "base/basictypes.h"
#include "base/memory/singleton.h"
#include "base/observer_list.h"
#include "base/task_runner.h"
#include "base/timer/timer.h"
#include "content/browser/power_profiler/power_data_provider.h"
#include "content/browser/power_profiler/power_profiler_observer.h"
#include "content/common/content_export.h"
namespace content {
// A class used to query power information and notify the observers.
class CONTENT_EXPORT PowerProfilerService {
public:
static PowerProfilerService* GetInstance();
// Add and remove an observer.
void AddObserver(PowerProfilerObserver* observer);
void RemoveObserver(PowerProfilerObserver* observer);
bool IsAvailable() const;
std::string GetAccuracyLevel() const;
virtual ~PowerProfilerService();
private:
enum Status {
UNINITIALIZED,
INITIALIZED, // Initialized, profiling has not started.
PROFILING
};
friend struct DefaultSingletonTraits<PowerProfilerService>;
friend class PowerProfilerServiceTest;
PowerProfilerService();
PowerProfilerService(scoped_ptr<PowerDataProvider> provider,
scoped_refptr<base::TaskRunner> task_runner,
const base::TimeDelta& sample_period);
void Start();
void Stop();
// Query power data from PowerDataProvider, executes on the WorkerPool thread.
void QueryDataOnTaskRunner();
// Initiate the query on the UI thread, the task is delegated to
// QueryDataOnTaskRunner.
void QueryData();
// Executes on the UI thread.
void Notify(const PowerEventVector&);
base::RepeatingTimer<PowerProfilerService> query_power_timer_;
scoped_refptr<base::TaskRunner> task_runner_;
Status status_;
// Sampling period of power data measurement.
base::TimeDelta sample_period_;
ObserverList<PowerProfilerObserver> observers_;
scoped_ptr<PowerDataProvider> data_provider_;
DISALLOW_COPY_AND_ASSIGN(PowerProfilerService);
};
} // namespace content
#endif // CONTENT_BROWSER_POWER_PROFILER_POWER_PROFILER_SERVICE_H_
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