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10.6. Attributes of a Listener


The “base” <listener> possesses the following attributes. These attribute definitions are inherited by all <listener> extensions. As such, they can be set for all of the listeners and gateways supported by the JBoss Enterprise SOA Platform, such as InVM.
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Table 10.2. Listener Attributes
Name Description Type Required
name The name of the listener. This attribute is required primarily for logging purposes. xsd:string true
busrefid Reference to the busid of the <bus> through which the listener instance receives messages. xsd:string true
maxThreads The maximum number of concurrent message processing threads that the listener can have active. xsd:int True
is-gateway Whether or not the listener instance is a “Gateway” or “Message Aware” Listener.
A message bus defines the details of a specific message channel or transport.
xsd:boolean true
Listeners can define a set of zero or more <property> elements (just like the <provider> and <bus> elements/types). These are used to define listener specific properties.

Note

For each gateway listener defined in a service, an ESB-aware (or “native”) listener must also be defined. This is because gateway listeners do not define bidirectional endpoints but, rather, “start points” into the ESB. You cannot send a message to a gateway from within the ESB. Also, note that, since a gateway is not an endpoint, it does not have an Endpoint Reference (EPR) persisted in the registry.
Here is an example of a <listener> referencing a <bus>:
<?xml version = "1.0" encoding = "UTF-8"?>
<jbossesb xmlns="http://anonsvn.jboss.org/repos/labs/labs/jbossesb/trunk/product/etc/schemas/xml/jbossesb-1.3.0.xsd"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://anonsvn.jboss.org/repos/labs/labs/jbossesb/trunk/product/etc/schemas/xml/jbossesb-1.3.0.xsd http://anonsvn.jboss.org/repos/labs/labs/jbossesb/trunk/product/etc/schemas/xml/jbossesb-1.3.0.xsd"
    parameterReloadSecs="5">
    <providers>
          <jms-provider name="JBossMQ" connection-factory="ConnectionFactory">
               <jms-bus busid="Reconciliation">
                  <jms-message-filter
                      dest-type="QUEUE"
                      dest-name="queue/B"
                   />
               </jms-bus>
<!-- busid --> <jms-bus busid="ReconciliationEsb">
                  <jms-message-filter
                      dest-type="QUEUE"
                      dest-name="queue/C"
               </jms-bus>
          </jms-provider>
      </providers>
      <services>
          <service category="Bank" name="Reconciliation"
                   description="Bank Reconciliation Service">
              <listeners>
<!-- busidref --> <jms-listener name="Bank-Listener"
                      busidref="Reconciliation"
                      is-gateway="true"/>
                  <jms-listener name="Bank-Esb"
                      busidref="ReconciliationEsb"/>
              </listeners>
              <actions>
                   ....
              </actions>
          </service>
      </services>
</jbossesb>

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