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From "Guillaume Nodet (JIRA)" <j...@apache.org>
Subject [jira] [Closed] (XBEAN-203) Performance improvement by adding local cache for MultiParentClassLoader#loadClass
Date Thu, 07 Jun 2012 12:58:22 GMT

     [ https://issues.apache.org/jira/browse/XBEAN-203?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Guillaume Nodet closed XBEAN-203.
---------------------------------

    Resolution: Fixed

Fixed with a very minor modification to avoid a duplicate call to reference.get() which could
actually be cleared the second time.

 http://svn.apache.org/viewvc/geronimo/xbean/trunk/xbean-classloader/src/main/java/org/apache/xbean/classloader/MultiParentClassLoader.java?rev=1347593&r1=1347592&r2=1347593&view=diff
                
> Performance improvement by adding local cache for MultiParentClassLoader#loadClass
> ----------------------------------------------------------------------------------
>
>                 Key: XBEAN-203
>                 URL: https://issues.apache.org/jira/browse/XBEAN-203
>             Project: XBean
>          Issue Type: Improvement
>          Components: classloader
>    Affects Versions: 3.7
>            Reporter: Gert Vanthienen
>            Assignee: Guillaume Nodet
>             Fix For: 3.12
>
>         Attachments: 0001-XBEAN-203-Performance-improvement-by-adding-local-ca.patch
>
>
> While profiling for performance issues on ServiceMix, we noticed a lot of time was spent
waiting for the object lock to access MultiParentClassLoader's loadClass() method, especially
when using things like JAXP.  We managed to get significant improvements by adding a local
cache to avoid the synchronized method invocation for previously loaded classes.

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