[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=16506881#comment-16506881 ]

Mathieu Lirzin commented on OFBIZ-6747:
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I am not aware about the whole story and the rationale behind it, but I think OFBiz shouldn't depend on non-standard libs like {{ConcurrentLinkedHashMap}} or {{Caffeine}}.  The reason is that the framework should depend only the standard {{ConcurrentMap}} interface and should let users choose the implementation of their choice.

To reduce the number of dependencies OFBiz should use one of the implementations from JavaSE by default and  provide a way to plug those more performance focused implementations.  A factory or any another configuration mechanism would make the job.

> 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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