软件包：libcaffeine-java（2.6.2-1.1）

High performance caching library

Caffeine provides an in-memory cache using a Google Guava inspired API. The improvements draw on the experience designing Guava's cache and ConcurrentLinkedHashMap.

Caffeine provides flexible construction to create a cache with a combination of the following features:

 * Automatic loading of entries into the cache, optionally asynchronously
 * Size-based eviction when a maximum is exceeded based on frequency
   and recency
 * Time-based expiration of entries, measured since last access or last write
 * Asynchronously refresh when the first stale request for an entry occurs
 * Keys automatically wrapped in weak references
 * Values automatically wrapped in weak or soft references
 * Notification of evicted (or otherwise removed) entries
 * Writes propagated to an external resource
 * Accumulation of cache access statistics

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