Wednesday, 28 December 2016

WSO2 - ESB | FOREACH MEDIATOR


FOREACH MEDIATOR

In the previous note, we saw how we can use custom classes as Mediators.

Moving on to cover other important mediation techniques, I was going through online documentation for 'FOREACH MEDIATOR' using this link -


when I realized, the sample code provided can be made more illustrative and a bit easier.


So code buddies, here we go with our version to create a small demo, using foreach mediator.


1. Kicking off with a sequence generation -

Declaring 'main2' as our sequence to imbibe foreach mediator -

xml version -

<?xml version="1.0" encoding="UTF-8"?>
<sequence name="main2" trace="enable" xmlns="http://ws.apache.org/ns/synapse">
<in>
<foreach expression="//m0:getQuote/m0:request"
xmlns:m0="http://services.samples"
xmlns:ns="http://org.apache.synapse/xsd" xmlns:ns3="http://org.apache.synapse/xsd">
<sequence>
<payloadFactory media-type="xml">
<format>
<m0:checkPriceRequest>
<m0:code>$1</m0:code>
</m0:checkPriceRequest>
</format>
<args>
<arg evaluator="xml" expression="//m0:request/m0:symbol"/>
</args>
</payloadFactory>
</sequence>
</foreach>
<log level="full"/>
</in>
<out/>
</sequence>


2. Defining an API to use the above sequence -

Let's call it 'foreachAPI' -


XML version -

<api xmlns="http://ws.apache.org/ns/synapse" name="foreachAPI" context="/fe">
<resource methods="POST GET" inSequence="main2" outSequence="main2"/>
</api>


3. Let's also enable the debug logging, for the above API -



4. Time to hit the API.

Let's use the same XML provided in the tutorial i.e. stockQuoteReq.xml -
    <soap:Header/>
    <soap:Body>
        <m0:getQuote>
            <m0:request><m0:symbol>IBM</m0:symbol></m0:request>
            <m0:request><m0:symbol>WSO2</m0:symbol></m0:request>
            <m0:request><m0:symbol>MSFT</m0:symbol></m0:request>
        </m0:getQuote>
    </soap:Body>
</soap:Envelope>
Save it locally, and invade the directory where it is parked. Run the below curl command -

curl -d @stockQuoteReq.xml -H "Content-Type: application/soap+xml;charset=UTF-8" "http://172.16.2.34:8280/fe/foreachAPI"



5. Output obtained, all the things done using console, no need to deploy any code 😃

o/p xml -

<?xml version="1.0" encoding="UTF-8"?>
<soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope" xmlns:m0="http://services.samples" xmlns:xsd="http://services.samples/xsd">
<soap:Body>
<m0:getQuote>
<m0:checkPriceRequest>
<m0:code>IBM</m0:code>
</m0:checkPriceRequest>
<m0:checkPriceRequest>
<m0:code>WSO2</m0:code>
</m0:checkPriceRequest>
<m0:checkPriceRequest>
<m0:code>MSFT</m0:code>
</m0:checkPriceRequest>
</m0:getQuote>
</soap:Body>
</soap:Envelope>

Keep experimenting buddies, share your thoughts!

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