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From "Brett Humphreys (JIRA)" <j...@apache.org>
Subject [jira] Commented: (AMQ-1892) Broker plugin to allow automatic discarding of the items being sent to the dead letter queue
Date Thu, 29 Oct 2009 15:26:53 GMT

    [ https://issues.apache.org/activemq/browse/AMQ-1892?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=55074#action_55074
] 

Brett Humphreys commented on AMQ-1892:
--------------------------------------

The above description isn't correct.  To use this within a XBean configuration file you'd
want to do the following:

               <plugins>
			<bean xmlns="http://www.springframework.org/schema/beans" id="discardingDlqBroker"
				class="org.apache.activemq.plugin.DiscardingDLQBrokerPlugin">
				<property name="dropAll" value="true" />
				<property name="dropTemporaryTopics" value="true" />
				<property name="dropTemporaryQueues" value="true" />
			</bean>
		</plugins>

The difference being that the class used is the *Plugin* not the raw filter.  

Full description of this problem, and what the exception looks like when you use the wrong
class can be found on this AMQ user thread:
http://mail-archives.apache.org/mod_mbox/activemq-users/200905.mbox/%3C904249.9763.qm@web50804.mail.re2.yahoo.com%3E

> Broker plugin to allow automatic discarding of the items being sent to the dead letter
queue
> --------------------------------------------------------------------------------------------
>
>                 Key: AMQ-1892
>                 URL: https://issues.apache.org/activemq/browse/AMQ-1892
>             Project: ActiveMQ
>          Issue Type: New Feature
>          Components: Broker
>    Affects Versions: 5.0.0, 5.1.0
>            Reporter: Filip Hanik
>            Assignee: Rob Davies
>             Fix For: 5.2.0
>
>         Attachments: discarding-dlq-plugin.zip
>
>
> A very simple, yet very useful plugin to the broker. This allows one to configure queues
and topics, all or matched based on regular expressions, to drop messages being sent to the
DLQ
> extremely useful when one uses constant pending message limit strategy or the other eviction
rules, but don't want to incur the overhead of yet another consumer to clear the DLQ
> Configuration looks like
>      <plugins>
>        <bean
>          xmlns="http://www.springframework.org/schema/beans"
>          id="discardingDlqBroker"
>          class="org.apache.activemq.plugin.DiscardingDLQBroker">
>  
>          <property name="dropAll" value="true"/>
>          <property name="dropTemporaryTopics" value="true"/>
>          <property name="dropTemporaryQueues" value="true"/>
>  
>          <!--drops by destination name, using java regular expressions
>              http://java.sun.com/j2se/1.5.0/docs/api/java/util/regex/Pattern.html
>              delimited by spaces, so destination names cannot contain spaces
>          <property name="dropOnly" value="topic_1 queue_1"/>
>          -->
>  
>          <!--how frequently do we output how many messages we have dropped - use 0
for disable-->
>          <property name="reportInterval" value="1000"/>
>        </bean>
>      </plugins>

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