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// Copyright (c) HashiCorp, Inc. // SPDX-License-Identifier: MPL-2.0 // 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. For this reason, it is in a separate go module contained within // this repository. // // All caches in this package take locks while operating, and are therefore // thread-safe for consumers. package lru