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From "Fabrice Delaporte (JIRA)" <j...@apache.org>
Subject [jira] Created: (CAMEL-1930) Synchronized access to XPathExpression resulting in contention for multiple consumers
Date Mon, 24 Aug 2009 09:15:50 GMT
Synchronized access to XPathExpression resulting in contention for multiple consumers
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                 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


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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