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From "Maurizio Cucchiara (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (OGNL-20) Performance - Replace synchronized blocks with ReentrantReadWriteLock
Date Tue, 06 Sep 2011 08:22:09 GMT

    [ https://issues.apache.org/jira/browse/OGNL-20?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13097795#comment-13097795
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Maurizio Cucchiara commented on OGNL-20:
----------------------------------------

Hi Olivier, 
be aware that there is already:
# a [patch|WW-3580] which sensibly reduces the synchronized code using something like the
double check idiom.
# an old [opensymphony patch|http://jira.opensymphony.com/browse/OGNL-101] which, if I recall
correctly, uses concurrent version of the map implementation.
It would be very interesting to compare this 3 different approaches. Before that, I think
we would need a performance test bench.

> 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
>
> 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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