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Written By : Amit
Title :
Application development on JBoss

Description :
Using Java Technology
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Written By : Amit
Title :
Mule ESB

Description :
example applications integrated
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Title :
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Open For Discussion

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Tags/Keywords : Mule ESB, Example JMS, Mule and OpenJMS Example, Mule MS, JMS Transport, Mule Transport
Author : Amit
Date (Year/Month/Date): 2010-05-17
Using Mule as ESB and integrating two Queues from OpenJMS

Please be informed that NONE of the design/code/matter from this page is claiming to be some
sort of best practice and we DO NOT expect any of our visitor/reader of this page to assume
this as some sort of best practice for any context and should not be using this as it is
without appropriate evaluation.
This page intends only to provide bits and pieces of known ways  for doing some sort of example
and may not be fit for any other purpose.

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We extend our sincerest apologies for the same.



Using Mule as ESB and trying to integrate two queues 
of some JMS Server.

In this example I shall be exploring a very simple example
whereby I shall use Open Source JMS server and create two
JMS Queues.

These Two JMS Queues will be integrated so that if any message
falls in one of the Queue, then automatically this message
 will be send to the other JMS Queue, and all these will 
 happen through use of Mule Standalone version 2.2.1 as 
 the ESB for this example.

 I have used OpenJMS (openjms-0.7.7-beta-1) as the JMS server
 for this example.

 By executing %OPEN_JMS%/bin/admin.bat , there open up an admin
 screen, from this screen, the JMS server can be started by 
 selecting  Actions->Start OpenJMS

 Once the OpenJMS server is successfully started.. then this
 admin screen can be connected to see all the topics , queues
 created by default, by selecting Actions->Connections->Online

 In this example I shall be using queue3 and queue1 (comes along
 with the default setting for OpenJMS) to be defined as inbound
 and outbound endpoints respectively for the Local Mule Setup.

 For Mule Standalone server to start, I have to provide my example
 configuration file, that is "sample-config.xml", as shown below:

 sample-config.xml

<?xml version="1.0" encoding="UTF-8"?>
<mule xmlns="http://www.mulesource.org/schema/mule/core/2.2"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	   xmlns:file="http://www.mulesource.org/schema/mule/file/2.2"
       xmlns:jms="http://www.mulesource.org/schema/mule/jms/2.2"
    xsi:schemaLocation="
       http://www.mulesource.org/schema/mule/core/2.2
	   http://www.mulesource.org/schema/mule/core/2.2/mule.xsd
   	   http://www.mulesource.org/schema/mule/jms/2.2
	   http://www.mulesource.org/schema/mule/jms/2.2/mule-jms.xsd" >
    <description>
        Integrating two JMS queues using Mule, an example
    </description>

    <configuration>
	  <default-threading-profile maxThreadsActive="1" 
	                             doThreading="false" maxBufferSize="1"/>
	</configuration>
    <jms:connector name="openJmsConn" maxRedelivery="1"
	jndiInitialFactory="org.exolab.jms.jndi.InitialContextFactory" 
	jndiProviderUrl="tcp://localhost:3035" 
	connectionFactoryJndiName="ConnectionFactory" jndiDestinations="true"
	numberOfConsumers="2" disableTemporaryReplyToDestinations="true"
	cacheJmsSessions="true"/>
    <model name="sampleExample">
	  <service name="sampleService">
	    <inbound>
    	 <jms:inbound-endpoint queue="queue3"/>
		</inbound>
        <outbound>
		  <pass-through-router>
			  <jms:outbound-endpoint queue="queue1"/>
          </pass-through-router>
		</outbound>
	  </service>
    </model>
</mule>


Before starting this example, and as this example uses OpenJMS, 
there is a need for providing all the required JAR files from OpenJMS 
to the Mule Standalone version 2.2.1, I have done this by having
most of the OpenJMS jar files from the LIB folder, made available
in the %MULE_HOME%\lib\opt directory.

Now the Mule server is started using a command line as follows:

mule -config <<example_directory>>/sample-config.xml

Once Mule server (locally) started successfully.. then time came to
test this configuration setting by sending a sample message to 
queue3 (defined in OpenJMS server), for this I used the default example
from OpenJMS distribution itself,

The Sender application, and passed arguments as asked for for sending
message to the destination (queue3).
As and when the JMS message is reached queue3, it just gets moved
to the queue1 as the outbound endpoint defined in Mule Community 
Server locally setup.

This made me how easy to use and powerful can be Mule ESB server.

If you have any questions, please let me know and I shall try to
answer your questions, as much as possible.

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