[jboss-dev-forums] [Design of JBoss Transaction Services] - TransactionManager and AS' ServiceBindingManager

[bstansberry@jboss.com]

Follow-up on a brief discussion that came up on the jboss-as list a few weeks ago.

ServiceBindingManager is an AS service that provides support for preventing port conflicts if 2 AS instances are started on the same machine and the ASs aren't bound to different interfaces. I've been having to redo the SBM to allow it to deal with pojo services, since before it could only work with mbeans. If you're interested in details on that, see http://wiki.jboss.org/wiki/AS5ServiceBindingManager and the forum thread linked at the top of that wiki.

I can now get SBM working with all services that deploy in the AS, except the TransactionManager -- specifically its recovery manager, which is configured via conf/jbossjta-properties.xml.  It appears the TM internally parses that file, so the existing SBM integration hooks won't work.

Some possibilities:

1) Expose some property on the "TransactionManager" bean that trumps the value that comes out of jbossjta-properties.xml.  The microcontainer can then use the SBM as the source of the correct value.

2) Have whatever parses jbossjta-properties.xml support system property substitution, e.g.

<property name="com.arjuna.ats.arjuna.recovery.recoveryPort" value="${jbossts.recovery.port:4712}"/>

We'd then deploy a bean along with the SBM that sets the proper system property. Hacky, and leaves the problem of ensuring the SBM deploys before the TransactionManager.

3) If the location where this jbossjta-properties.xml comes from can be made configurable on the TransactionManager bean, we can use a hack like we use on the Tomcat server.xml file.  The SBM is given the location of the base file, does an XSL Transform on it to put in the correct values, saves the result as a temp file, and the service is told to use the temp file for its configuration. A long-standing hack whose usage I for sure would hate to see expanded.

Any thoughts?

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