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      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 #include "RecentEventLogger.h"
     18 #include "SensorServiceUtils.h"
     19 
     20 #include <utils/Timers.h>
     21 
     22 #include <inttypes.h>
     23 
     24 namespace android {
     25 namespace SensorServiceUtil {
     26 
     27 namespace {
     28     constexpr size_t LOG_SIZE = 10;
     29     constexpr size_t LOG_SIZE_LARGE = 50;  // larger samples for debugging
     30 }// unnamed namespace
     31 
     32 RecentEventLogger::RecentEventLogger(int sensorType) :
     33         mSensorType(sensorType), mEventSize(eventSizeBySensorType(mSensorType)),
     34         mRecentEvents(logSizeBySensorType(sensorType)) {
     35     // blank
     36 }
     37 
     38 void RecentEventLogger::addEvent(const sensors_event_t& event) {
     39     std::lock_guard<std::mutex> lk(mLock);
     40     mRecentEvents.emplace(event);
     41 }
     42 
     43 bool RecentEventLogger::isEmpty() const {
     44     return mRecentEvents.size() == 0;
     45 }
     46 
     47 std::string RecentEventLogger::dump() const {
     48     std::lock_guard<std::mutex> lk(mLock);
     49 
     50     //TODO: replace String8 with std::string completely in this function
     51     String8 buffer;
     52 
     53     buffer.appendFormat("last %zu events\n", mRecentEvents.size());
     54     int j = 0;
     55     for (int i = mRecentEvents.size() - 1; i >= 0; --i) {
     56         const auto& ev = mRecentEvents[i];
     57         struct tm * timeinfo = localtime(&(ev.mWallTime.tv_sec));
     58         buffer.appendFormat("\t%2d (ts=%.9f, wall=%02d:%02d:%02d.%03d) ",
     59                 ++j, ev.mEvent.timestamp/1e9, timeinfo->tm_hour, timeinfo->tm_min, timeinfo->tm_sec,
     60                 (int) ns2ms(ev.mWallTime.tv_nsec));
     61 
     62         // data
     63         if (mSensorType == SENSOR_TYPE_STEP_COUNTER) {
     64             buffer.appendFormat("%" PRIu64 ", ", ev.mEvent.u64.step_counter);
     65         } else {
     66             for (size_t k = 0; k < mEventSize; ++k) {
     67                 buffer.appendFormat("%.2f, ", ev.mEvent.data[k]);
     68             }
     69         }
     70         buffer.append("\n");
     71     }
     72     return std::string(buffer.string());
     73 }
     74 
     75 bool RecentEventLogger::populateLastEvent(sensors_event_t *event) const {
     76     std::lock_guard<std::mutex> lk(mLock);
     77 
     78     if (mRecentEvents.size()) {
     79         // Index 0 contains the latest event emplace()'ed
     80         *event = mRecentEvents[0].mEvent;
     81         return true;
     82     } else {
     83         return false;
     84     }
     85 }
     86 
     87 
     88 size_t RecentEventLogger::logSizeBySensorType(int sensorType) {
     89     return (sensorType == SENSOR_TYPE_STEP_COUNTER ||
     90             sensorType == SENSOR_TYPE_SIGNIFICANT_MOTION ||
     91             sensorType == SENSOR_TYPE_ACCELEROMETER) ? LOG_SIZE_LARGE : LOG_SIZE;
     92 }
     93 
     94 RecentEventLogger::SensorEventLog::SensorEventLog(const sensors_event_t& e) : mEvent(e) {
     95     clock_gettime(CLOCK_REALTIME, &mWallTime);
     96 }
     97 
     98 } // namespace SensorServiceUtil
     99 } // namespace android
    100