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

Table of Contents

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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 Item	Simple Stock Quote Service Response
Aggregator	Aggregate Mediator
Inventory Order	WSO2 ESB Response

Environment setup

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.
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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Simulating the sample scenario

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

Code Block

language	html/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>

Image Removed

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.

SOAP UI response Image 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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Key

Environment setup

Simulating the sample scenario

How the implementation works