[jira] [Commented] (OFBIZ-6747) Replace ConcurrentLinkedHashMap by Caffeine

[Nicolas Malin (Jira)]

    [ https://issues.apache.org/jira/browse/OFBIZ-6747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16509486#comment-16509486 ]

Taher Alkhateeb commented on OFBIZ-6747:
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Amazing Ben, in a few words you're opening my eyes to a whole bunch of ideas and I'm still reading on all the algorithms. Really fascinating stuff thank you for sharing. If you can also recommend any books that would be awesome.

A problem we'll face is that our code base is rather old and pretty much spaghetti patterns are everywhere and most of our code is a concrete implementation without interfaces. I have to think of how to wire this Cache interface with the rest of the architecture cleanly. Perhaps one way is to to try and apply the ConcurrentMap signature on all methods, then create an adapter if / when needed with the UtilCache to keep everything working smoothly as we disentangle references to the Util class or others. Phew hurts my head just to say that :)

> Replace ConcurrentLinkedHashMap by Caffeine
> -------------------------------------------
>
>                 Key: OFBIZ-6747
>                 URL: https://issues.apache.org/jira/browse/OFBIZ-6747
>             Project: OFBiz
>          Issue Type: Task
>            Reporter: Ben Manes
>            Assignee: Jacques Le Roux
>            Priority: Minor
>
> Similar to OFBIZ-3779, please consider upgrading the library used by [UtilCache|https://github.com/apache/ofbiz/blob/trunk/framework/base/src/org/ofbiz/base/util/cache/UtilCache.java] (v1.2). The current version is 1.4.2 and is the last major release planned.
> The preferable alternative would be to upgrade to [Caffeine|https://github.com/ben-manes/caffeine]. This is a Java 8 rewrite based on what I've learned since developing CLHM and Guava's cache. As expected it provides [superior performance|https://github.com/ben-manes/caffeine/wiki/Benchmarks]. It also provides a [near optimal|https://github.com/ben-manes/caffeine/wiki/Efficiency] eviction policy.

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