WSO2 esb endpoint template uri parameter concat - templates

Question

I would like to create a parametrized endpoint to send messages to JMS queue depending on content of the message, say e.g. MY_QUEUE. The endpoint uri should thus look like
jms:/MY_QUEUE?transport.jms.ConnectionFactoryJNDIName=QueueConnectionFactory&java.naming.factory.initial=org.apache.activemq.jndi.ActiveMQInitialContextFactory&java.naming.provider.url=tcp://localhost:61616&transport.jms.DestinationType=queue
I created and endpoint template like this:
<template xmlns="http://ws.apache.org/ns/synapse" name="TM_out_endpoint_template">
<axis2ns158:parameter xmlns:axis2ns158="http://ws.apache.org/ns/synapse" name="queue"></axis2ns158:parameter>
<endpoint name="$name">
<address uri="jms:/$queue?transport.jms.ConnectionFactoryJNDIName=QueueConnectionFactory&java.naming.factory.initial=org.apache.activemq.jndi.ActiveMQInitialContextFactory&java.naming.provider.url=tcp://localhost:61616&transport.jms.DestinationType=queue">
<suspendOnFailure>
<progressionFactor>1.0</progressionFactor>
</suspendOnFailure>
<markForSuspension>
<retriesBeforeSuspension>0</retriesBeforeSuspension>
<retryDelay>0</retryDelay>
</markForSuspension>
</address>
</endpoint>
</template>
However like this the $queue parameter won't get processed. If I substitute the whole URI, it works, but I would like to keep the rest of the URI in the template rather than to pass them from a calling sequence. In short I only want to pass the queue name. How can I concat a param with a string within the endpoint template? E.g. jms:/${queue}?transport... or something. Is there a way?

Answer 1

This is happening because, $ in $queue parameter get ignored during template rendering because of the / prior to that. So you have to populate the queue name with jms:/ prefix.
This is the modified version of your template.
<template xmlns="http://ws.apache.org/ns/synapse" name="TM_out_endpoint_template">
<axis2ns158:parameter xmlns:axis2ns158="http://ws.apache.org/ns/synapse" name="queue"></axis2ns158:parameter>
<endpoint name="$name">
<address uri="$queue?transport.jms.ConnectionFactoryJNDIName=QueueConnectionFactory&java.naming.factory.initial=org.apache.activemq.jndi.ActiveMQInitialContextFactory&java.naming.provider.url=tcp://localhost:61616&transport.jms.DestinationType=queue">
<suspendOnFailure>
<progressionFactor>1.0</progressionFactor>
</suspendOnFailure>
<markForSuspension>
<retriesBeforeSuspension>0</retriesBeforeSuspension>
<retryDelay>0</retryDelay>
</markForSuspension>
</address>
</endpoint>
</template>