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From "Sergio Bossa (JIRA)" <j...@apache.org>
Subject [jira] Updated: (CAMEL-2729) Enable transaction propagation for SEDA component
Date Mon, 17 May 2010 14:19:05 GMT

     [ https://issues.apache.org/activemq/browse/CAMEL-2729?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sergio Bossa updated CAMEL-2729:
--------------------------------

    Attachment: seda-camel.zip

> Enable transaction propagation for SEDA component
> -------------------------------------------------
>
>                 Key: CAMEL-2729
>                 URL: https://issues.apache.org/activemq/browse/CAMEL-2729
>             Project: Apache Camel
>          Issue Type: Improvement
>    Affects Versions: 2.2.0
>            Reporter: Sergio Bossa
>         Attachments: seda-camel.zip
>
>
> 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
implementations.
> 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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