Spring Data Cache

默认使用 ConcurrentMapCacheManager 不可配置，一般用于测试

it comes with no cache configuration options. However, it may be useful for testing or simple caching scenarios. For advanced local caching needs, consider JCacheCacheManager, EhCacheCacheManager, CaffeineCacheManager.

https://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/cache/concurrent/ConcurrentMapCacheManager.html

guava cache

使用方法

原理 及 数据结构

强引用 弱引用