看代码时候发现有些核查采用如下

    1. Preconditions.checkState(timeDifferenceMilliseconds < getMaxTolerateTimeDifferenceMilliseconds(), 
    2.                 "Clock is moving backwards, last time is %d milliseconds, current time is %d milliseconds", lastMilliseconds, currentMilliseconds);

    image.png

    这个是guava包中的工具用法，还是很不错的