transactions - Does ActiveMQ support multiple transactional consumers? -


i developing osgi bundles in servicemix consume same queue of activemq.

i need sure message dequeued if every thing goes fine don't lose message. used camel transactional client. manged implement following tutorial http://camel.apache.org/transactional-client.html

however, problem when deploy many bundles consuming same queue, 1 consumer working @ same time.

what should enable parallel transactional consumption in activemq ?

thanks in advance.

regards,

this implementation (just copied tutorial):

the camel route:

   <route>       <from uri="activemq:queue:foo"/>       <transacted ref="required"/>       <process ref="myprocessor"/>       <to uri="activemq:queue:bar"/>     </route>

the spring context :

<!-- setup jms connection factory --> <bean id="poolconnectionfactory" class="org.apache.activemq.pool.pooledconnectionfactory">     <property name="maxconnections" value="8"/>     <property name="connectionfactory" ref="jmsconnectionfactory"/> </bean>  <bean id="jmsconnectionfactory" class="org.apache.activemq.activemqconnectionfactory">     <property name="brokerurl" value="vm://localhost?broker.persistent=false&amp;broker.usejmx=false"/> </bean>  <!-- setup spring jms tx manager --> <bean id="jmstransactionmanager" class="org.springframework.jms.connection.jmstransactionmanager">     <property name="connectionfactory" ref="poolconnectionfactory"/> </bean>  <!-- define our activemq component --> <bean id="activemq" class="org.apache.activemq.camel.component.activemqcomponent">     <property name="connectionfactory" ref="poolconnectionfactory"/>     <!-- define jms consumer/producer transacted -->     <property name="transacted" value="true"/>     <!-- setup transaction manager use -->     <!-- if not provided camel automatic use jmstransactionmanager, if          instance use jta transaction manager must configure -->     <property name="transactionmanager" ref="jmstransactionmanager"/> </bean>

i found solution here http://activemq.2283324.n4.nabble.com/blocking-transactions-td2354801.html;cid=1431937246689-831.

the problem due prefetch limit. recommended put 0 when there multiple consumers if aren't transactional.

so had change camel route adding ?destination.consumer.prefetchsize=0 way :

<route>  <from uri="activemq:queue:foo?destination.consumer.prefetchsize=0"/> <transacted ref="required"/> <process ref="myprocessor"/> <to uri="activemq:queue:bar"/> </route>

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