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From "Sergio Bossa (JIRA)" <>
Subject [jira] Created: (CAMEL-2729) Enable transaction propagation for SEDA component
Date Mon, 17 May 2010 14:19:04 GMT
Enable transaction propagation for SEDA component

                 Key: CAMEL-2729
             Project: Apache Camel
          Issue Type: Improvement
    Affects Versions: 2.2.0
            Reporter: Sergio Bossa

I was recently working on a pure SEDA prototype based on Camel and ActiveMQ, and the biggest
problem I had was the lack of transaction propagation among stages/threads, due to the Spring
transaction-per-thread model which Camel relies on.
Hence, it is currently impossible to commit/rollback transactions from a different stage than
the one that initiated it.

So, I developed a patch to org.apache.camel.component.jms.JmsConfiguration class in order
to use a custom org.springframework.jms.listener.AbstractMessageListenerContainer which enables
external transaction management.
Then, I developed a Camel bean component to bind and propagate transactional resources among
threads, and manually commit/rollback transactions.
I'm attaching a sample project containing and showcasing all this stuff: it reads from an
ActiveMQ queue, does dummy processing, and puts on another queue.
In order to run:
$> mvn test
In order to run with an injected fault and do rollback:
$> mvn test -Pfault-test
WARN: requires a local ActiveMQ broker at tcp://localhost:61616

I'd like to gain some feedback and eventually talk about including such a features into Camel
code base, which would require to:
1) Patch JmsConfiguration in order to allow injection of external AbstractMessageListenerContainer
2) Patch JmsConfiguration in order to avoid forcing to set the TransactionManager.
3) Somewhat enrich the Seda component to natively support transaction propagation.

Feel free to ask any question, and thanks for listening!

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