https://www.jianshu.com/p/32e1361817f0
https://www.cnblogs.com/shyroke/category/1139071.html
https://tech.meituan.com/2018/11/15/java-lock.html
https://mp.weixin.qq.com/s/oR8IDlpA01aq8byGf02_6w
https://mp.weixin.qq.com/s?__biz=MzU1NTkwODE4Mw==&mid=2247497021&idx=1&sn=a4c9e9af10ea9dbc4e6295ceb6e986a0&chksm=fbcf9805ccb81113bc2e7835645e6249bed9abe6bb96fb0eb511f0fe8dfdd67fa983503f4d0b&scene=21#wechat_redirect