[jira] [Resolved] (OGNL-20) Performance - Replace synchronized blocks with ReentrantReadWriteLock

["Maurizio Cucchiara (Resolved) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/OGNL-20?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Maurizio Cucchiara resolved OGNL-20.
------------------------------------

    Resolution: Fixed
      Assignee: Maurizio Cucchiara

OK, 
I have just merged the branch with the trunk.
Please let me know...
                
> Performance - Replace synchronized blocks with ReentrantReadWriteLock
> ---------------------------------------------------------------------
>
>                 Key: OGNL-20
>                 URL: https://issues.apache.org/jira/browse/OGNL-20
>             Project: OGNL
>          Issue Type: Improvement
>         Environment: ALL
>            Reporter: Greg Lively
>            Assignee: Maurizio Cucchiara
>         Attachments: Bench Results.txt, Caching_Mechanism_Benchmarks.patch
>
>
> I've noticed a lot of synchronized blocks of code in OGNL. For the most part, these synchronized blocks are controlling access to HashMaps, etc. I believe this could be done far better using ReentrantReadWriteLocks. ReentrantReadWriteLock allows unlimited concurrent access, and single threads only for writes. Perfect in an environment where the ratio of reads  is far higher than writes; which is typically the scenario for caching. Plus the access control can be tuned for reads and writes; not just a big synchronized{} wrapping a bunch of code.

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