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

Aggregator EIP (Figure 1)Aggregator Example Scenario (Figure 2)
Inventory ItemSimple Stock Quote Service Response
AggregatorAggregate Mediator
Inventory OrderWSO2 ESB 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 three Sample Axis2 server instances on ports 9000, 9001, and 9002. For instructions, refer to the section Setting up the ESB Samples - Starting the Axis2 server in the WSO2 ESB documentation.

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  1. Send the following request to the ESB using a SOAP client like SoapUI.

    Code Block
    languagehtml/xml
    <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ser="http://services.samples" xmlns:xsd="http://services.samples/xsd">
    
       <soapenv:Header/>
       <soapenv:Body>
          <ser:getQuote>     
             <ser:request>           
                <xsd:symbol>foo</xsd:symbol>
             </ser:request>        
          </ser:getQuote>
       </soapenv:Body>
    
    </soapenv:Envelope>
  2. The user will be able to see the merged response for all three quotes made in the request as shown in the following example screen.

    Image RemovedSOAP UI responseImage Added
    Following is the SOAP UI response:

    Code Block
    <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">
       <soapenv:Body>
          <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>-2.449710302988639</ax21:change>
                <ax21:earnings>12.690017002832839</ax21:earnings>
                <ax21:high>79.38275695387269</ax21:high>
                <ax21:last>77.22850281442805</ax21:last>
                <ax21:lastTradeTimestamp>Wed Nov 29 12:59:06 IST 2017</ax21:lastTradeTimestamp>
                <ax21:low>79.38308604492651</ax21:low>
                <ax21:marketCap>4.739596110875734E7</ax21:marketCap>
                <ax21:name>foo Company</ax21:name>
                <ax21:open>79.71513129360467</ax21:open>
                <ax21:peRatio>-19.10241171204308</ax21:peRatio>
                <ax21:percentageChange>-2.8140977078887763</ax21:percentageChange>
                <ax21:prevClose>87.05135916643378</ax21:prevClose>
                <ax21:symbol>foo</ax21:symbol>
                <ax21:volume>5669</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>4.325567388568272</ax21:change>
                <ax21:earnings>13.917524756780233</ax21:earnings>
                <ax21:high>-150.03201351709225</ax21:high>
                <ax21:last>153.6310415907754</ax21:last>
                <ax21:lastTradeTimestamp>Wed Nov 29 12:59:06 IST 2017</ax21:lastTradeTimestamp>
                <ax21:low>158.59314334689392</ax21:low>
                <ax21:marketCap>5.39033218230091E7</ax21:marketCap>
                <ax21:name>foo Company</ax21:name>
                <ax21:open>-149.91220476236305</ax21:open>
                <ax21:peRatio>23.560027115374034</ax21:peRatio>
                <ax21:percentageChange>-3.0061812398993424</ax21:percentageChange>
                <ax21:prevClose>-143.8891085859184</ax21:prevClose>
                <ax21:symbol>foo</ax21:symbol>
                <ax21:volume>8605</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>-2.4406464308408315</ax21:change>
                <ax21:earnings>-8.597741661105367</ax21:earnings>
                <ax21:high>-54.30538809695713</ax21:high>
                <ax21:last>55.531927639640884</ax21:last>
                <ax21:lastTradeTimestamp>Wed Nov 29 12:59:06 IST 2017</ax21:lastTradeTimestamp>
                <ax21:low>57.22511125047622</ax21:low>
                <ax21:marketCap>1.3145403912401013E7</ax21:marketCap>
                <ax21:name>foo Company</ax21:name>
                <ax21:open>-54.55876175775735</ax21:open>
                <ax21:peRatio>23.455303962825276</ax21:peRatio>
                <ax21:percentageChange>4.547031422081542</ax21:percentageChange>
                <ax21:prevClose>-53.67560072245006</ax21:prevClose>
                <ax21:symbol>foo</ax21:symbol>
                <ax21:volume>8464</ax21:volume>
             </ns:return>
          </ns:getQuoteResponse>
       </soapenv:Body>
    </soapenv:Envelope>

How the implementation works

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