時間測試工具類

public class PerformanceMeasurementUtil {
    private static final Map<String, Long> accruedTimeMap = new ConcurrentHashMap<>();
    private static final Map<String, Long> startTimeMap = new ConcurrentHashMap<>();
    private static final Logger logger = LoggerFactory.getLogger(PerformanceMeasurementUtil.class);
    private static final String MSG_TOTAL_TIME = "Performance Measurement Results in Thread %d:----The total time for key %s is %d";
    private static final String MSG_START_TIME = "Performance Measurement Start Time in Thread %d: The start time for key %s is %d";
    private static final String MSG_END_TIME = "Performance Measurement End Time in Thread %d:---The end time for key %s is %d";

    public static void recordStartTime(String measurementKey) {
        Long now = System.currentTimeMillis();
        startTimeMap.put(measurementKey, now);
        //logger.error(String.format(MSG_START_TIME, Thread.currentThread().getId(), measurementKey, now));
    }

    public static void recordEndTime(String measurementKey) {
        long now = System.currentTimeMillis();
        //logger.error(String.format(MSG_END_TIME, Thread.currentThread().getId(), measurementKey, now));
        Long startTime = startTimeMap.get(measurementKey);
        long consumedTime = now - startTime;

        Long accruedTime = accruedTimeMap.get(measurementKey);
        Long totalTime = add(accruedTime, consumedTime);

        accruedTimeMap.put(measurementKey, totalTime);
    }

    private static Long add(Long accruedTime, long consumedTime) {
        return accruedTime == null ? consumedTime : accruedTime + consumedTime;
    }

    public static void printMeasurements() {
        for (Map.Entry<String, Long> entry : accruedTimeMap.entrySet()) {
            logger.error(String.format(MSG_TOTAL_TIME, Thread.currentThread().getId(), entry.getKey(), entry.getValue()));
        }
    }

    public static void log(String msg) {
        logger.error(String.format("Log msg in Thread %d: %s", Thread.currentThread().getId(), msg));
    }

    public static void reset() {
        logger.error("time has been cleared");
        startTimeMap.clear();
        accruedTimeMap.clear();
    }
}