遗留方法：当前支持内存或分布式缓存服务。
Legacy method: Currently support in-memory or distributed cache services.
每个方法都获取对EntityManager的一个引用，它提供对内存缓存的支持。
Each method gains a reference to an EntityManager, which represents the in-memory cache.
它既支持本地磁盘缓存，也支持内存中的缓存。
It supports both local disk caching as well as caching in memory.
它受流行的分布式内存对象缓存系统memcached支持。
It is powered by memcached, a popular distributed memory-object caching system.
支持基于内存缓存的会话管理。
Made it possible to do memory-cached-based session management.
支持基于内存缓存的会话管理。
Made it possible to do memory-cached-based session management.
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