工具类-耗时计算工具类TimeCostUtil基于ThreadLocal实现

工具类-耗时计算工具类TimeCostUtil基于ThreadLocal实现

功能：基于ThreadLocal实现，可在线程内任意地方开始计时、计算计时和终止计时；

/**
 * 耗时计算工具类
 *
 * @Author ccl
 * @Date 2020/12/28 14:08
 */
public class TimeCostUtil {
     
    private static final ThreadLocal<Long> TIME_THREADLOCAL = new ThreadLocal<Long>() {
     
        @Override
        protected Long initialValue() {
     
            return System.currentTimeMillis();
        }
    };

    /**
     * 开始计时
     */
    public static void begin() {
     
        long l = System.currentTimeMillis();
        TIME_THREADLOCAL.set(l);
    }

    /**
     * 结束计时
     *
     * @return
     */
    public static long end() {
     
        long cost = System.currentTimeMillis() - TIME_THREADLOCAL.get();
        TIME_THREADLOCAL.remove();
        return cost;
    }

    /**
     * 获取开始时间
     *
     * @return
     */
    public static long get() {
     
        return TIME_THREADLOCAL.get();
    }
   /* public static void main(String[] args) {
        System.out.println(TimeCostUtil.end());
        new Thread(()->{
            System.out.println(TimeCostUtil.end());
        }).start();
        new Thread(()->{
            System.out.println(TimeCostUtil.end());
        }).start();
    }*/
}