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<td class="page-title-pattern-first-line " style="padding: 0px; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://hibernate.atlassian.net/browse/HHH" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-10315" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-4e34028b-199f-4d33-9471-b281b7a9cd78" height="16" width="16" border="0" align="absmiddle" alt="New Feature" style="vertical-align: text-bottom" /></a> <a href="https://hibernate.atlassian.net/browse/HHH-10315" style="color: #3b73af; text-decoration: none">HHH-10315</a>
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<td style="vertical-align: top;; padding: 0px; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://hibernate.atlassian.net/browse/HHH-10315" style="color: #3b73af; text-decoration: none">Add caching support for Caffeine</a> </span>
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Change By:
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="ben.manes" id="email_ben.manes" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=ben.manes" style="color:#6c797f;; color: #3b73af; text-decoration: none">Ben Manes</a>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0"> <span class="diffaddedchars" style="background-color:#ddfade;">[</span> <span class="diffcontext">Caffeine</span> <span class="diffaddedchars" style="background-color:#ddfade;">|https://github.com/ben-manes/caffeine]</span> <span class="diffcontext"> is a Java 8 rewrite of Guava's cache to provide significantly [higher performance|https://github.com/ben-manes/caffeine/wiki/Benchmarks] and a [near optimal hit rate|https://github.com/ben-manes/caffeine/wiki/Efficiency]. Previously I co-authored Guava's Cache and ConcurrentLinkedHashMap (used by Cassandra, etc).<br /><br />Caffeine's policy takes into account both the recency and frequency in O(1) time, retaining the popularity history by using a compact sketch. The concurrent throughput scales linearly (tested with 32-core) at 33% of an unbounded Java 8 `ConcurrentHashMap`. The implementation passes Guava's test suite, JSR166's TCK, and its own (consisting of over 1M test execution variants). There is about 95% code coverage and is well documented.<br /><br />In comparison, Ehcache has poor performance and in v3 the hit rate was dramatically reduced. Instead of taking a random sample, an MRU heavy distribution is sampled and then the priority strategy (LRU, etc) is applied. This leads to very a poor hit rate for small caches, raising to a random policy's hit rate for large caches. Infinispan is much better in regards to efficiency, but with even worse concurrent performance due to being optimized for cache misses (not hits).<br /><br />If there is interest, I'd like to contribute a module with some guidance on how to implement it.</span>
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