https://my.oschina.net/ffy/blog/501003
https://yq.aliyun.com/articles/622757
https://blog.csdn.net/starrykey/article/details/52049613
https://blog.csdn.net/tantexian/article/details/49946181
缓存算法及Redis、Memcached、Guava、Ehcache中的算法
原文：https://www.cnblogs.com/tonggc1668/p/10213561.html