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    <p>Guava team member here.</p> <p>The Guava <code>Cache</code> implementation expires entries in the course of normal maintenance operations, which occur on a per-segment basis during cache write operations and occasionally during cache read operations. Entries usually aren't expired at <em>exactly</em> their expiration time, just because <code>Cache</code> makes the deliberate decision not to create its own maintenance thread, but rather to let the user decide whether continuous maintenance is required.</p> <p>I'm going to focus on <code>expireAfterAccess</code>, but the procedure for <code>expireAfterWrite</code> is almost identical. In terms of the mechanics, when you specify <code>expireAfterAccess</code> in the <code>CacheBuilder</code>, then each segment of the cache maintains a linked list access queue for entries in order from least-recent-access to most-recent-access. The cache entries are actually themselves nodes in the linked list, so when an entry is accessed, it removes itself from its old position in the access queue, and moves itself to the end of the queue.</p> <p>When cache maintenance is performed, all the cache has to do is to expire every entry at the front of the queue until it finds an unexpired entry. This is straightforward and requires relatively little overhead, and it occurs in the course of normal cache maintenance. (Additionally, the cache deliberately limits the amount of work done in a single cleanup, minimizing the expense to any single cache operation.) Typically, the cost of cache maintenance is dominated by the expense of computing the actual entries in the cache.</p>
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    1. POHow does Guava expire entries in its CacheBuilder?
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    1. USLouis Wasserman
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    1. CO+1... Thanks a lot for the explanation and thanks a lot for Guava. The linked list "trick" is very neat! I'm installing Guava right away: thanks to your detailed answer I'm now sold on Guava : )
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      1. USCedric Martin
    2. COCharles Fry gave a great presentation on MapMaker / CacheBuilder at Strange Loop. The talk is available [on InfoQ](http://www.infoq.com/presentations/Concurrent-Caching-at-Google)
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      1. USEtienne Neveu
 

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