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// Package lru provides three different LRU caches of varying sophistication. // // Cache is a simple LRU cache. It is based on the // LRU implementation in groupcache: // https://github.com/golang/groupcache/tree/master/lru // // TwoQueueCache tracks frequently used and recently used entries separately. // This avoids a burst of accesses from taking out frequently used entries, // at the cost of about 2x computational overhead and some extra bookkeeping. // // ARCCache is an adaptive replacement cache. It tracks recent evictions as // well as recent usage in both the frequent and recent caches. Its // computational overhead is comparable to TwoQueueCache, but the memory // overhead is linear with the size of the cache. // // ARC has been patented by IBM, so do not use it if that is problematic for // your program. // // All caches in this package take locks while operating, and are therefore // thread-safe for consumers. package lru