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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 CHROMEOS_ACCELEROMETER_ACCELEROMETER_READER_H_
#define CHROMEOS_ACCELEROMETER_ACCELEROMETER_READER_H_
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/observer_list_threadsafe.h"
#include "chromeos/accelerometer/accelerometer_types.h"
#include "chromeos/chromeos_export.h"
namespace base {
template <typename T>
struct DefaultSingletonTraits;
class SequencedTaskRunner;
}
namespace chromeos {
class AccelerometerFileReader;
// Reads an accelerometer device and reports data back to an
// AccelerometerDelegate.
class CHROMEOS_EXPORT AccelerometerReader {
public:
// The time to wait between reading the accelerometer.
static const int kDelayBetweenReadsMs;
// An interface to receive data from the AccelerometerReader.
class Observer {
public:
virtual void OnAccelerometerUpdated(
scoped_refptr<const AccelerometerUpdate> update) = 0;
protected:
virtual ~Observer() {}
};
static AccelerometerReader* GetInstance();
void Initialize(
scoped_refptr<base::SequencedTaskRunner> sequenced_task_runner);
// Add/Remove observers.
void AddObserver(Observer* observer);
void RemoveObserver(Observer* observer);
protected:
AccelerometerReader();
virtual ~AccelerometerReader();
private:
friend struct base::DefaultSingletonTraits<AccelerometerReader>;
// Worker that will run on the base::SequencedTaskRunner provided to
// Initialize. It will determine accelerometer configuration, read the data,
// and notify observers.
scoped_refptr<AccelerometerFileReader> accelerometer_file_reader_;
DISALLOW_COPY_AND_ASSIGN(AccelerometerReader);
};
} // namespace chromeos
#endif // CHROMEOS_ACCELEROMETER_ACCELEROMETER_READER_H_
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