1 /* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef ANDROID_SENSOR_SERVICE_UTIL_RECENT_EVENT_LOGGER_H 18 #define ANDROID_SENSOR_SERVICE_UTIL_RECENT_EVENT_LOGGER_H 19 20 #include "RingBuffer.h" 21 #include "SensorServiceUtils.h" 22 23 #include <hardware/sensors.h> 24 #include <utils/String8.h> 25 26 #include <mutex> 27 28 namespace android { 29 namespace SensorServiceUtil { 30 31 // A circular buffer that record the last N events of a sensor type for debugging. The size of this 32 // buffer depends on sensor type and is controlled by logSizeBySensorType(). The last N events 33 // generated from the sensor are stored in this buffer. The buffer is NOT cleared when the sensor 34 // unregisters and as a result very old data in the dumpsys output can be seen, which is an intended 35 // behavior. 36 class RecentEventLogger : public Dumpable { 37 public: 38 RecentEventLogger(int sensorType); 39 void addEvent(const sensors_event_t& event); 40 bool populateLastEvent(sensors_event_t *event) const; 41 bool isEmpty() const; 42 virtual ~RecentEventLogger() {} 43 44 // Dumpable interface 45 virtual std::string dump() const override; 46 47 protected: 48 struct SensorEventLog { 49 SensorEventLog(const sensors_event_t& e); 50 timespec mWallTime; 51 sensors_event_t mEvent; 52 }; 53 54 const int mSensorType; 55 const size_t mEventSize; 56 57 mutable std::mutex mLock; 58 RingBuffer<SensorEventLog> mRecentEvents; 59 60 private: 61 static size_t logSizeBySensorType(int sensorType); 62 }; 63 64 } // namespace SensorServiceUtil 65 } // namespace android; 66 67 #endif // ANDROID_SENSOR_SERVICE_UTIL_RECENT_EVENT_LOGGER_H 68 69
