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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ANDROID_SENSOR_SERVICE_UTIL_RECENT_EVENT_LOGGER_H
#define ANDROID_SENSOR_SERVICE_UTIL_RECENT_EVENT_LOGGER_H
#include "RingBuffer.h"
#include "SensorServiceUtils.h"
#include <hardware/sensors.h>
#include <utils/String8.h>
#include <mutex>
namespace android {
namespace SensorServiceUtil {
// A circular buffer that record the last N events of a sensor type for debugging. The size of this
// buffer depends on sensor type and is controlled by logSizeBySensorType(). The last N events
// generated from the sensor are stored in this buffer. The buffer is NOT cleared when the sensor
// unregisters and as a result very old data in the dumpsys output can be seen, which is an intended
// behavior.
class RecentEventLogger : public Dumpable {
public:
explicit RecentEventLogger(int sensorType);
void addEvent(const sensors_event_t& event);
bool populateLastEvent(sensors_event_t *event) const;
bool isEmpty() const;
virtual ~RecentEventLogger() {}
// Dumpable interface
virtual std::string dump() const override;
virtual void setFormat(std::string format) override;
protected:
struct SensorEventLog {
explicit SensorEventLog(const sensors_event_t& e);
timespec mWallTime;
sensors_event_t mEvent;
};
const int mSensorType;
const size_t mEventSize;
mutable std::mutex mLock;
RingBuffer<SensorEventLog> mRecentEvents;
bool mMaskData;
private:
static size_t logSizeBySensorType(int sensorType);
};
} // namespace SensorServiceUtil
} // namespace android;
#endif // ANDROID_SENSOR_SERVICE_UTIL_RECENT_EVENT_LOGGER_H
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