From d42816bf030c00632f5db7709d9de46e96a0005b Mon Sep 17 00:00:00 2001
From: jaysunxiao <jaysunxiao@gmail.com>
Date: Wed, 9 Jun 2021 17:06:09 +0800
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 - 轻量级的cron表达式实现，时间可以向前调，也可以向后调，都会出发trigger
 - 每秒钟执行一次SchedulerManager.triggerPerSecond()方法，循环遍历可执行的scheduler
-- triggerPerSecond在计算下一次triggerTimestamp会很耗时间，所以尽量避免配置一秒或者间隔时间很短的cron表达式
 - SchedulerManager的executor只有一条线程，所以使用者要避免做耗时和阻塞的运算，如果有这样的需求可以抛到其它线程池
 
 ### Ⅱ. Cron Expression Example