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https://issues.apache.org/jira/browse/GROOVY-7977?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul King closed GROOVY-7977.
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> Refine the implementation of LRUCache
> -------------------------------------
>
>                 Key: GROOVY-7977
>                 URL: https://issues.apache.org/jira/browse/GROOVY-7977
>             Project: Groovy
>          Issue Type: Improvement
>    Affects Versions: 2.4.7
>            Reporter: Daniel Sun
>            Assignee: Daniel Sun
>            Priority: Minor
>             Fix For: 2.6.0-alpha-1
>
>         Attachments: text.html, text.html, text.html, text.html, text.html, 
> text.html, text.html, text.html
>
>
>          I found the LRUCache that Groovy is using is not efficient enough 
> because it is based on Collections.synchronizedMap, the LRUCache is used by 
> some important classes(e.g. ProxyGenerator, Closure), so it can impact the 
> performance somehow. 
>          I propose to replace the implementation with 
> Caffeine(https://github.com/ben-manes/caffeine), which is a high performance 
> caching library for Java 8 and licensed under APL2.



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