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From "Thomas Vandahl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (JCS-119) replace synchronized blocks by java locks or concurrenhashmap
Date Tue, 20 Dec 2016 18:35:59 GMT

    [ https://issues.apache.org/jira/browse/JCS-119?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15764899#comment-15764899
] 

Thomas Vandahl commented on JCS-119:
------------------------------------

Thanks again. I don't think we need anything special. I thought just in case.
FYI, I'm planning to copy the CLHM class and use it as-is in JCS.

> replace synchronized blocks by java locks or concurrenhashmap
> -------------------------------------------------------------
>
>                 Key: JCS-119
>                 URL: https://issues.apache.org/jira/browse/JCS-119
>             Project: Commons JCS
>          Issue Type: Improvement
>            Reporter: Romain Manni-Bucau
>            Assignee: Thomas Vandahl
>             Fix For: jcs-2.1
>
>
> A cache is typically used in a concurrent environment. Since Java 6 using a ReentrantLock
is faster than synchronized so can be interesting to replace synchronized blocks by a lock.
> Places i'm thinking about:
> * CompositeCache
> * AbstractDoubleLinkedListMemoryCache
> * LHMLRUMemoryCache
> * DoubleLinkedList
> * LRUMap
> * SingleLinkedList
> * SortedPreferentialArray
> Some places where replacing a HashMap by a ConcurrentHashMap can allow to get rid of
synchronized without needing a lock:
> * CacheEventQueue
> * AbstractDiskCache
> * CacheWatchRepairable
> There are other places but this is the main I saw.



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