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From "Claus Ibsen (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (CAMEL-1930) Synchronized access to XPathExpression resulting in contention for multiple consumers
Date Tue, 13 Oct 2009 07:41:53 GMT

     [ https://issues.apache.org/activemq/browse/CAMEL-1930?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Claus Ibsen resolved CAMEL-1930.
--------------------------------

    Resolution: Fixed

Thanks Fabrice for testing it and providing screenshots (nice to see the before and after
situation).

I have applied the patch to trunk: 824627.

> Synchronized access to XPathExpression resulting in contention for multiple consumers
> -------------------------------------------------------------------------------------
>
>                 Key: CAMEL-1930
>                 URL: https://issues.apache.org/activemq/browse/CAMEL-1930
>             Project: Apache Camel
>          Issue Type: Bug
>          Components: camel-core
>    Affects Versions: 2.0-M3
>         Environment: Java 1.6, Spring 2.5.6
>            Reporter: Fabrice Delaporte
>            Assignee: Claus Ibsen
>             Fix For: 2.1.0
>
>         Attachments: camel_1930.patch, with-contention.jpg, without-contention.jpg, XPathRouteConcurrentBigTest.java
>
>
> Hi,
> I'm using Camel to do some JMS message routing. Messages are XML so xpath is a natural
choice.
> However when using a choice with an xpath expression, the XPathBuilder creates one XPathExpression
object. According to the specification, these objects are not thread safe so synchronizing
looks natural. But then, using multiple jms consumers is totally useless since no concurrent
evaluations can be made.
> XPathExpression objects would rather need to be stored in a ThreadLocal to avoid synchronization
and contention.
> Cheers,
> Fabrice

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