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Before digging into implementation details, let's take a look at the relationship between the example scenario and the Composed Msg. Processor EIP by comparing their core components.

Composed Msg. Processor EIP (Figure 1)Composed Msg. Processor Example Scenario (Figure 2)
New OrderStock Quote Request  
Splitter

Iterate Mediator

RouterSwitch Mediator
Widget/Gadget Inventory

Stock Quote Service Instance

Aggregator

Aggregate Mediator

Validated OrderAggregated Stock Quote Response

Environment setup

  1. 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 Installation Guide in the WSO2 ESB documentation.
  2. Start two Sample Axis2 server instances in ports 9000 and 9001. For instructions, refer to the section Setting up the ESB Samples - Starting the Axis2 server in the WSO2 ESB documentation.

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Code Block
languagehtml/xml
linenumberstrue
<?xml version="1.0" encoding="UTF-8"?>
<definitions xmlns="http://ws.apache.org/ns/synapse">
    <proxy name="ComposedMessageProxy" startOnLoad="true">
        <target>
            <inSequence>
                <log level="full"/>
                <iterate xmlns:m0="http://services.samples"                      preservePayload="true"                      attachPath="//m0:getQuote" expression="//m0:getQuote/m0:request">
                    expression="//m0:getQuote/m0:request">
<target>
              <target>           <sequence>
       <sequence>                      <switch xmlns:m1="http://services.samples/xsd" source="//m1:symbol">
                                <case regex="IBM">
                                    <send>
                                        <endpoint>
                                            <address uri="http://localhost:9000/services/SimpleStockQuoteService"/>
                                        </endpoint>
                                    </send>
                                </case>
                                <case regex="WSO2">
                                    <send>
                                        <endpoint>
                                            <address uri="http://localhost:9001/services/SimpleStockQuoteService"/>
                                        </endpoint>
                                    </send>
                                </case>
                                <default>
                                    <drop/>
                                </default>
                            </switch>
                        </sequence>
                    </target>
                </iterate>
            </inSequence>
            <outSequence>
                <aggregate>
                    <completeCondition>
                        <messageCount/>
                    </completeCondition>
                    <onComplete xmlns:m0="http://services.samples" expression="//m0:getQuoteResponse">
                        <send/>
                    </onComplete>
                </aggregate>
            </outSequence>
        </target>
        <publishWSDL uri="file:repositorysamples/samplesservice-bus/resources/proxy/sample_proxy_1.wsdl"/>
    </proxy>

</definitions>

Simulating the sample scenario

Send the following request using a SOAP client such as SoapUI. 

Code Block
languagehtml/xml
<soapenv:Envelope  <sequence name="fault">
xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ser="http://services.samples" xmlns:xsd="http://services.samples/xsd">
   <soapenv:Header/>
   <soapenv:Body>
     <log level="full"> <ser:getQuote>     
    <property name="MESSAGE" value="Executing default &#34;fault&#34; sequence"/> <ser:request>          <property name="ERROR_CODE"
expression="get-property('ERROR_CODE')"/>          <property name="ERROR_MESSAGE" expression="get-property('ERROR_MESSAGE')"/> <xsd:symbol>IBM</xsd:symbol>
         </log>ser:request>
          <ser:request>            
            <drop/><xsd:symbol>WSO2</xsd:symbol>
         </sequence>
   <sequence name="main">ser:request>
         <ser:request>           
            <xsd:symbol>IBM</xsd:symbol>
         <log</>ser:request>
      <drop</>ser:getQuote>
   </sequence>soapenv:Body>
</definitions>

Simulating the sample scenario

...

soapenv:Envelope>

Note that the three responses are merged together.

SOAP response of Composed Message ProcessorImage Added

Code Block
languagehtml/xml
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">
   <soapenv:Body>
      <ns:getQuoteResponse xmlns:serns="http://services.samples">
         <ns:return xsi:type="ax21:GetQuoteResponse" xmlns:xsdax21="http://services.samples/xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
            <ax21:change>-2.3524349166988148</ax21:change>
            <ax21:earnings>13.039287427943174</ax21:earnings>
            <ax21:high>-147.82215416089954</ax21:high>
            <ax21:last>150.42944098590854</ax21:last>
            <ax21:lastTradeTimestamp>Wed Nov  <soapenv:Header/>
   <soapenv:Body>29 13:10:16 IST 2017</ax21:lastTradeTimestamp>
            <ax21:low>156.00309322666212</ax21:low>
            <ax21:marketCap>4.0704702811974496E7</ax21:marketCap>
            <ax21:name>IBM Company</ax21:name>
            <ser:getQuote><ax21:open>156.54563823303528</ax21:open>
            <ax21:peRatio>24.744940446245423</ax21:peRatio>
      <ser:request>      <ax21:percentageChange>-1.4082628986156709</ax21:percentageChange>
            <ax21:prevClose>167.04515321757532</ax21:prevClose>
            <xsd<ax21:symbol>IBM</xsdax21:symbol>
            <ax21:volume>19856</ax21:volume>
         </ser:request>ns:return>
      </ns:getQuoteResponse>
      <ns:getQuoteResponse xmlns:ns="http://services.samples">
         <ns:return xsi:type="ax21:GetQuoteResponse" xmlns:ax21="http://services.samples/xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
            <ax21:change>4.338630296226518</ax21:change>
            <ax21:earnings>-9.981195004808995</ax21:earnings>
            <ax21:high>-93.23101400112802</ax21:high>
            <ax21:last>93.78054915571116</ax21:last>
            <ax21:lastTradeTimestamp>Wed Nov 29 13:10:16 IST 2017</ax21:lastTradeTimestamp>
            <ax21:low>-91.67657115464598</ax21:low>
            <ax21:marketCap>1.2048601227631677E7</ax21:marketCap>
            <ax21:name>IBM Company</ax21:name>
            <ax21:open>97.71302391406073</ax21:open>
            <ax21:peRatio>23.753214298084966</ax21:peRatio>
            <ser:request><ax21:percentageChange>-4.997221061621991</ax21:percentageChange>
            <ax21:prevClose>-86.8208598884415</ax21:prevClose>
           <xsd <ax21:symbol>WSO2<symbol>IBM</xsdax21:symbol>
            </ser:request><ax21:volume>7120</ax21:volume>
         </ns:return>
      </ns:getQuoteResponse>
      <ns:getQuoteResponse xmlns:ns="http://services.samples">
         <ns:return xsi:type="ax21:GetQuoteResponse" xmlns:ax21="http://services.samples/xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
            <ax21:change>-2.8758173622682595</ax21:change>
            <ax21:earnings>13.587800448945982</ax21:earnings>
            <ax21:high>-60.60915794654595</ax21:high>
            <ax21:last>61.521647372674394</ax21:last>
            <ax21:lastTradeTimestamp>Wed Nov 29 13:10:16 IST 2017</ax21:lastTradeTimestamp>
            <ax21:low>63.7318273151116</ax21:low>
            <ax21:marketCap>1319867.136948647</ax21:marketCap>
            <ax21:name>WSO2 Company</ax21:name>
            <ax21:open>64.03367826249405</ax21:open>
            <ax21:peRatio>23.802458318708982</ax21:peRatio>
            <ser:request><ax21:percentageChange>-4.319528792063117</ax21:percentageChange>
            <ax21:prevClose>66.57710830756369</ax21:prevClose>
           <xsd <ax21:symbol>IBM<symbol>WSO2</xsdax21:symbol>
            <ax21:volume>16990</ax21:volume>
         </serns:request>return>
      </serns:getQuote>getQuoteResponse>
   </soapenv:Body>
</soapenv:Envelope>

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How the implementation works
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