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https://issues.apache.org/jira/browse/CAMEL-8602?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14491351#comment-14491351
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Claus Ibsen commented on CAMEL-8602:
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Thanks for letting us know. We will follow your advice when we drop support for
JDK 1.7
> Java 8: ConcurrentLinkedHashMap -> Caffeine
> -------------------------------------------
>
> Key: CAMEL-8602
> URL: https://issues.apache.org/jira/browse/CAMEL-8602
> Project: Camel
> Issue Type: Task
> Components: camel-core
> Reporter: Ben Manes
> Priority: Minor
> Fix For: 3.0.0, Future
>
>
> When Camel transitions to requiring Java 8, please upgrade to Caffeine. The
> performance should be relatively the same. The per-instance memory usage
> should be smaller and Camel may decide to opt-in to use some of the
> additional features. The only drawback is that the jar size is larger due to
> code generation, though that may be trimmed over time and usually is not a
> concern for server-side applications.
> ConcurrentLinkedHashMap changes will continue to be minimal, even more so
> now, and driven by requests from Java 6 users unable to upgrade. Caffeine is
> ideally the upgrade path for Guava cache users too, which due to Android
> cannot be significantly modified.
> Caffeine: https://github.com/ben-manes/caffeine
> Benchmarks: https://github.com/ben-manes/caffeine/wiki/Benchmarks
> ConcurrentLinkedHashMap: https://code.google.com/p/concurrentlinkedhashmap
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