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Download and install WSO2 ESB from http://wso2.com/products/enterprise-service-bus. For a list of prerequisites and step-by-step installation instructions, refer to Getting Started in the WSO2 ESB documentation.
Start the a sample Axis2 server instances in ports 9001 and 9002instance on port 9000. For instructions, refer to the section see ESB Samples Setup - Starting Sample Back-End Services in the WSO2 ESB documentation.

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Start the ESB server and log into its management console UI (https://localhost:9443/carbon). In the management console, navigate to the Main Menu, click Service Bus and then Source View menu and click Source View in the Service Bus section. Next, copy and paste the following configuration, which helps you explore the example scenario, to the source view.

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	step3
	step3

Code Block

language	html/xml
linenumbers	true

<definitions xmlns="http://ws.apache.org/ns/synapse">
   
   <sequence name="sendSeq">
      <property name="sendSeq"
                value="*** At Sending Sequence ***"
                scope="default"
                type="STRING"/>
      <log level="custom">
         <property name="mainSeq" expression="get-property('mainSeq')"/>
         <property name="seq1" expression="get-property('seq1')"/>
         <property name="sendSeq" expression="get-property('seq1')"/>
      </log>
      <send>
         <endpoint>
            <address uri="http://localhost:9000/services/SimpleStockQuoteService"/>
         </endpoint>
      </send>
   </sequence>

   <sequence name="seq1">
      <property name="seq1"
                value="*** At Sequence 1 ***"
                scope="default"
                type="STRING"/>
      <sequence key="sendSeq"/>
   </sequence>

   <sequence name="fault">
      <log level="full">
         <property name="MESSAGE" value="Executing default 'fault' 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">
      <in>
         <filter xmlns:ns="http://org.apache.synapse/xsd"
                 source="get-property('To')"
                 regex="http://localhost:9000.*">
            <then>
               <property name="mainSeq" value="** At Main Sequence**"/>
               <sequence key="seq1"/>
            </then>
            <else/>
         </filter>
      </in>
      <out>
         <send/>
      </out>
      <description>The main sequence for the message mediation</description>
   </sequence>
</definitions>

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Let's investigate the elements of the ESB configuration in detail. The line numbers below refer to the ESB configuration shown abovestep3.

Sequence [line 21 19 in ESB config] - The sequence with key seq1 defines a Message Context property called seq1 and calls the sequence sendSeq.
Sequence [line 38 36 in ESB config] - This is the main sequence that is invoked when the ESB receives a request. The main sequence filters the messages (line 40 38 in ESB config) to determine whether the request is going to an endpoint that begins with http://localhost:9000 . If so, a Message Context property called mainSeq is defined, and the sequence seq1 is invoked.
Sequence [line 4 2 in ESB config] - The sequence with key send_seq defines a Message Context property called sendSeq. It then logs the properties by calling the get-property XPath function for the properties set in all the sequences, namely mainSeq, seq1, and sendSeq. After logging this information, the Send mediator is called to forward the message to the endpoint.

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