This documentation is for WSO2 Enterprise Service Bus version 5.0.0. For the latest ESB, view the latest WSO2 Enterprise Integrator documentation.

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Sample Scenario

ESB listens to the message queue and sends that message to multiple queues. If something goes wrong in sending the message to one of those queues, the original message should be rolled back to the listening queue and none of the other queues should receive the message. Thus, the entire transaction should be rolled back.

 

Prerequisites

  • Windows, Linux or Solaris operating systems with WSO2 ESB installed. For instructions on downloading and installing  WSO2 ESB, see Installation Guide.
  • WSO2 ESB's JMS transport configured with ActiveMQ. For instructions, see Configure with ActiveMQ.

Configuring the sample scenario

  1. Create the JMSListenerProxy proxy service in ESB with the following configuration:

    Code Block
    languagexml
    <proxy xmlns="http://ws.apache.org/ns/synapse"
           name="JMSListenerProxy"
           transports="https http jms"
           startOnLoad="true">
       <description/>
       <target>
          <inSequence>
             <property name="OUT_ONLY" value="true"/>
             <log level="custom">
                <property name="MESSAGE_ID_A" expression="get-property('MessageID')"/>
             </log>
             <log level="custom">
                <property name="BEFORE" expression="$body"/>
             </log>
             <property name="MESSAGE_ID_B"
                       expression="get-property('MessageID')"
                       scope="operation"
                       type="STRING"/>
             <property name="failureResultProperty"
                       scope="default"
                       description="FailureResultProperty">
                <result xmlns="">failure</result>
             </property>
             <enrich>
                <source clone="true" xpath="$ctx:failureResultProperty"/>
                <target type="body"/>
             </enrich>
             <log level="custom">
                <property name="AFTER" expression="$body"/>
             </log>
             <property name="BEFORE1" value="ABCD" scope="axis2" type="STRING"/>
            <callout serviceURL="jms:/ActiveMQPublisher1?transport.jms.ConnectionFactoryJNDIName=XAConnectionFactory&amp;java.naming.factory.initial=org.apache.activemq.jndi.ActiveMQInitialContextFactory&amp;java.naming.provider.url=tcp://localhost:61616&amp;transport.jms.DestinationType=queue;transport.jms.TransactionCommand=begin">
                <source type="envelope"/>
                <target xmlns:s12="http://www.w3.org/2003/05/soap-envelope"
                        xmlns:s11="http://schemas.xmlsoap.org/soap/envelope/"
                        xpath="s11:Body/child::*[fn:position()=1] | s12:Body/child::*[fn:position()=1]"/>
             </callout>
             <callout serviceURL="jms:/ActiveMQPublisher2?transport.jms.ConnectionFactoryJNDIName=XAConnectionFactory&amp;java.naming.factory.initial=org.apache.activemq.jndi.ActiveMQInitialContextFactory&amp;java.naming.provider.url=tcp://localhost:61616&amp;transport.jms.DestinationType=queue">
                <source type="envelope"/>
                <target xmlns:s12="http://www.w3.org/2003/05/soap-envelope"
                        xmlns:s11="http://schemas.xmlsoap.org/soap/envelope/"
                        xpath="s11:Body/child::*[fn:position()=1] | s12:Body/child::*[fn:position()=1]"/>
             </callout>
             <callout serviceURL="jms:/ActiveMQPublisher3?transport.jms.ConnectionFactoryJNDIName=XAConnectionFactory&amp;java.naming.factory.initial=org.apache.activemq.jndi.ActiveMQInitialContextFactory&amp;java.naming.provider.url=tcp://localhost:61616&amp;transport.jms.DestinationType=queue;transport.jms.TransactionCommand=end">
                <source type="envelope"/>
                <target xmlns:s12="http://www.w3.org/2003/05/soap-envelope"
                        xmlns:s11="http://schemas.xmlsoap.org/soap/envelope/"
                        xpath="s11:Body/child::*[fn:position()=1] | s12:Body/child::*[fn:position()=1]"/>
             </callout>
             <drop/>
          </inSequence>
          <faultSequence>
             <log level="custom">
                <property name="Transaction Action" value="Rollbacked"/>
             </log>
             <callout serviceURL="jms:/ActiveMQPublisherFault?transport.jms.ConnectionFactoryJNDIName=XAConnectionFactory&amp;java.naming.factory.initial=org.apache.activemq.jndi.ActiveMQInitialContextFactory&amp;java.naming.provider.url=tcp://localhost:61616&amp;transport.jms.DestinationType=queue;transport.jms.TransactionCommand=rollback">
                <source type="envelope"/>
                <target xmlns:s12="http://www.w3.org/2003/05/soap-envelope"
                        xmlns:s11="http://schemas.xmlsoap.org/soap/envelope/"
                        xpath="s11:Body/child::*[fn:position()=1] | s12:Body/child::*[fn:position()=1]"/>
             </callout>
          </faultSequence>
       </target>
       <parameter name="transport.jms.ContentType">
          <rules>
             <jmsProperty>contentType</jmsProperty>
             <default>application/xml</default>
          </rules>
       </parameter>
       <parameter name="transport.jms.Destination">MyJMSQueue</parameter>
    </proxy>

    In the above configuration,  ESB listens to a JMS queue named MyJMSQueue and consumes messages as well as sends messages to multiple JMS queues in a transactional manner.

  2. To place a message into MyJMSQueue, execute the following command from <ESB_HOME>/samples/axis2Client directory:

    Code Block
    languagexml
    ant stockquote -Dmode=placeorder -Dtrpurl="jms:/MyJMSQueue?transport.jms.ConnectionFactoryJNDIName=QueueConnectionFactory&java.naming.factory.initial=org.apache.activemq.jndi.ActiveMQInitialContextFactory&java.naming.provider.url=tcp://localhost:61616&transport.jms.ContentTypeProperty=Content-Type&transport.jms.DestinationType=queue"

    You can see how ESB consumes messages from the queue named MyJMSQueue and sends the messages to multiple queues.

    To check the rollback functionality provide an unreachable host name to any destination queue and save the configurations. You should be able to observe ESB fault sequence getting invoked and failed message delivered to the destination configured in fault sequence.