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Chapter 23. Queue Attributes
Queue attributes can be set in one of two ways; by configuring them using the configuration file or by using the core API. This chapter will explain how to configure each attribute and what effect the attribute has.
23.1. Predefined Queues
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Queues can be predefined through configuration at a core level or at a JMS level. First look at a JMS level.
JMS Level
The following shows a queue predefined in the JBOSS_DIST/jboss-as/server/<PROFILE>/deploy/hornetq/hornetq-jms.xml configuration file.
<queue name="selectorQueue"> <entry name="/queue/selectorQueue"/> <selector string="color='red'"/> <durable>true</durable> </queue>
<queue name="selectorQueue">
<entry name="/queue/selectorQueue"/>
<selector string="color='red'"/>
<durable>true</durable>
</queue>
This name attribute of <queue> defines the name of the queue. When doing this at a JMS level a naming convention is followed so the actual name of the core queue will be
jms.queue.selectorQueue.
The mandatory <entry> element configures the name used to bind the queue to JNDI. <queue> can contain multiple <entry> elements to bind the same queue to different names.
The optional <selector> element defines what JMS message selector the predefined queue will have. Only messages that match the selector will be added to the queue. When omitted from the <queue> the default value is
null.
The optional <durable> element specifies whether the queue is persisted. When omitted from the <queue> the default value is
true.
Core Level
A queue can be predefined at a core level in the <JBOSS_HOME>/jboss-as/server/<PROFILE>/deploy/hornetq/hornetq-configuration.xml file.
This is very similar to the JMS configuration, with the following exceptions:
- The name attribute of queue is the actual name used for the queue with no naming convention as in JMS.
- The address element defines what address is used for routing messages.
- There is no entry element.
- The filter uses the Core filter syntax (described in Chapter 12, Filter Expressions), not the JMS selector syntax.
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