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This section explains, through an example scenario, how the Message Broker EIP can be implemented using WSO2 ESB. The following topics are covered:

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1. Download and install WSO2 ESB from  http://wso2.com/products/enterprise-service-bus . Installation home will be referred to as <ESB_HOME>. For a list of prerequisites and step-by-step installation instructions, refer to Getting Started Installation Guide in the WSO2 ESB documentation.
2. Copy the following files from <MB_HOME>/client-lib to <ESB_HOME>/repository/components/lib.
   
   • geronimo-jms_1.1_spec-1.1.0.wso2v1.jar
   • andes-client-0.13.wso2v8.1.jar

3. Enable the JMS transport receivers and senders by uncommenting the relevant sections in the <ESB_HOME>/repository/conf/axis2/axis2.xml file. For example:

   Code Block
   language html/xml
   <transportReceiver name="jms" class="org.apache.axis2.transport.jms.JMSListener"> <parameter name="myTopicConnectionFactory" locked="false"> <parameter name="java.naming.factory.initial" locked="false">org.wso2.andes.jndi.PropertiesFileInitialContextFactory</parameter> <parameter name="java.naming.provider.url" locked="false">repository/conf/jndi.properties</parameter> <parameter name="transport.jms.ConnectionFactoryJNDIName" locked="false">TopicConnectionFactory</parameter> <parameter name="transport.jms.ConnectionFactoryType" locked="false">topic</parameter> </parameter> <parameter name="myQueueConnectionFactory" locked="false"> <parameter name="java.naming.factory.initial" locked="false">org.wso2.andes.jndi.PropertiesFileInitialContextFactory</parameter> <parameter name="java.naming.provider.url" locked="false">repository/conf/jndi.properties</parameter> <parameter name="transport.jms.ConnectionFactoryJNDIName" locked="false">QueueConnectionFactory</parameter> <parameter name="transport.jms.ConnectionFactoryType" locked="false">queue</parameter> </parameter> <parameter name="default" locked="false"> <parameter name="java.naming.factory.initial" locked="false">org.wso2.andes.jndi.PropertiesFileInitialContextFactory</parameter> <parameter name="java.naming.provider.url" locked="false">repository/conf/jndi.properties</parameter> <parameter name="transport.jms.ConnectionFactoryJNDIName" locked="false">QueueConnectionFactory</parameter> <parameter name="transport.jms.ConnectionFactoryType" locked="false">queue</parameter> </parameter> </transportReceiver> ......... <transportSender name="jms" class="org.apache.axis2.transport.jms.JMSSender"/>

4. Define the following properties in the <ESB_HOME>/repository/conf/jndi.properties file.

   Code Block
   language html/xml
   ..... #Need change QueueConnection factory as follows connectionfactory.QueueConnectionFactory = amqp://admin:admin@clientID/carbon?brokerlist='tcp://localhost:5673' connectionfactory.TopicConnectionFactory = amqp://admin:admin@clientID/carbon?brokerlist='tcp://localhost:5673' # register some queues in JNDI using the form # queue.[jndiName] = [physicalName] queue.myqueue=myqueue # register some topics in JNDI using the form - Commented since this sample is not going to use Topics # topic.[jndiName] = [physicalName] #topic.MyTopic = example.MyTopic

5. Start the sample Axis2 server on ports 9001 and 9002. For instructions, refer to the section Setting up the ESB Samples Setup - Starting Sample Back-End Servicesthe Axis2 server in the WSO2 ESB documentation.

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<?xml version="1.0" encoding="UTF-8"?>
<definitions xmlns="http://ws.apache.org/ns/synapse">
   <proxy name="StockQuoteProxy"
          transports="http"
          startOnLoad="true"
          trace="disable">
      <description/>
      <target>
			<!-- Send message to WSO2 MB -->
         <endpoint>
            <address uri="jms:/myqueue?transport.jms.ConnectionFactoryJNDIName=QueueConnectionFactory&amp;java.naming.factory.initial=org.wso2.andes.jndi.PropertiesFileInitialContextFactory&amp;java.naming.provider.url=repository/conf/jndi.properties&amp;transport.jms.DestinationType=queue"/>
         </endpoint>
         <inSequence>
            <property name="OUT_ONLY" value="true"/>
            <property name="FORCE_SC_ACCEPTED" value="true" scope="axis2"/>
            <property name="transport.jms.ContentTypeProperty"
                      value="Content-Type"
                      scope="axis2"/>
         </inSequence>
         <outSequence>
            <property name="TRANSPORT_HEADERS" scope="axis2" action="remove"/>
            <send/>
         </outSequence>
      </target>
   </proxy>
   <sequence name="fault">
      <log level="full">
         <property name="MESSAGE" value="Executing default &#34;fault&#34; sequence"/>
         <property name="ERROR_CODE" expression="get-property('ERROR_CODE')"/>
         <property name="ERROR_MESSAGE" expression="get-property('ERROR_MESSAGE')"/>
      </log>
      <drop/>
   </sequence>
   <sequence name="main">
      <log/>
      <drop/>
   </sequence>
</definitions>

Simulating the sample scenario

Send a request using Stock Quote client to the proxy service in the following manner. For information on the Stock Quote client, refer to the Sample Clients section in WSO2 ESB documentation. 

ant stockquote -Dtrpurl=http://localhost:8280/services/StockQuoteProxy -Dsymbol=WSO2

Note that the request is stored in WSO2 Message Broker. Any consumer can access the stored message by accessing  destinationMyQueue in WSO2 Message Broker.

How the implementation works

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• jms:/myqueue - Looks for a JNDI entry myqueue (see JNDI properties above).
• ? - Separator indicating extra attributes.
• transport.jms.ConnectionFactoryJNDIName=QueueConnectionFactory - Looks up ConnectionFactory in JNDI with name QueueConnectionFactory.
• &  - Separator (this will convert to ‘&’)
• java.naming.factory.initial=org.wso2.andes.jndi.PropertiesFileInitialContextFactory -  Uses the andes properties-based JNDI.
• &  - Another separator (this will convert to ‘&’)
  
• java.naming.provider.url=repository/conf/jndi.properties -  Looks in  repository/conf/jndi.properties for the JNDI properties file.