[jboss-as7-dev] Use a module to setup external dependencies for a JMS Bridge?

[Jeff Mesnil]

still working on the JMS bridge... :)

The JMS bridge uses JNDI to lookup the JMS resources of external JMS 
brokers. This means that I must have the client implementation classes 
of these brokers inside AS7 to instantiate them.

More precisely, the JMS Bridge code is located in HornetQ jar, so the 
external jars must be made available to org.hornetq module.
As I don't want to modify this module to be able to configure a JMS 
bridge, I did a more convoluted thing.

There is already a reverse dependency from org.hornetq to 
org.jboss.as.messaging module (so that HornetQ can instantiate AS7 
integration classes).
Leveraging this, I added another 
org.jboss.as.messaging.bridge-integration module that is the placeholder 
for these external jars.

This module is a dependency of org.hornetq through org.jboss.as.messaging.

    org.jboss.as.messaging.bridge-integration (contains external
         ^                                     brokers resources)
         |
         |
      depends-on
         |
         |
    org.jboss.as.messaging  --depends-on-->  org.hornetq (contains
         ^                                       |     the JMS Bridge)
         |                                       |
         |                                       |
         |                                       |
         +---------------------------------------+
          reverse dependency so that HornetQ
          can instantiated AS integration classes


It works, I am able to bridge ActiveMQ (I don't have the jars of other 
brokers to test) to HornetQ with it.

It requires to:
1. add ActiveMQ client jars to 
module/org/jboss/as/messaging/bridge-integration/main
2. add them as <resource-root> to this bridge-integration module.xml

wdyt?

Is it acceptable to ask users to modify this module for JMS bridge 
integration?
Is there a simpler/better way to achieve this?
Am I shooting myself in the foot when I will bridge to an older AS 
version (haven't tried it yet)?

I have now 2 modules (org.jboss.as.messaging and 
org.jboss.as.messaging.bridge-integration) for the messaging subsystem?
Is that OK?

thanks,
jeff


-- 
Jeff Mesnil
JBoss, a division of Red Hat
http://jmesnil.net/