I am implementing the Fan out -- Fan in splitter EIP inside a proxy , whereby :
|-----> shoe store-(1-M)-------------
productSearchRq -- |-->Rs
|-----> ack clothes store-(0-1)------
Shoe store = Data service and Clothes store = Axis 2 service .
So in short I implement the pattern above ; I clone the request , send it , get responses , format them using payloadFactory:
<productDetails>
<productID>$1</productID>
<productName>$2</productName>
<productSize>$3</productSize>
<productColour>$4</productColour>
<productType>$5</productType>
<sourceID>$6</sourceID>
</productDetails>
on both responses ( and iterate [//productDetails , iterate id = iT] on shoe products since it's one to many). Then in the following response handler , I try to aggregate all these productDetails.
<sequence xmlns="http://ws.apache.org/ns/synapse" name="productSearchHandler">
<log level="custom">
<property name="pocSearchRsHandlerSeq reached" value="++++++++++++++=========Aggregating now========+++++++++++++++++=="></property>
</log>
<aggregate id="iT">
<completeCondition>
<messageCount min="-1" max="-1"></messageCount>
</completeCondition>
<onComplete xmlns:ns="http://org.apache.synapse/xsd" expression="//productDetails">
<log level="custom" separator=",">
<property name="::::" value="======================= Formatting the Aggregated Responses. ==============="></property>
</log>
<log level="full"></log>
</onComplete>
</aggregate>
<aggregate>
<completeCondition>
<messageCount min="-1" max="-1"></messageCount>
</completeCondition>
<onComplete xmlns:ns="http://org.apache.synapse/xsd" expression="//productDetails">
<payloadFactory media-type="xml">
<format>
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:prod="http://za.co.pepkor/product_service/">
<soapenv:Body>
<prod:productSearchResp> $1 </prod:productSearchResp>
</soapenv:Body>
</soapenv:Envelope>
</format>
<args>
<arg expression="//productDetails" evaluator="xml"></arg>
</args>
</payloadFactory>
<switch source="get-property('CallType')">
<case regex="SOAP">
<send></send>
</case>
<case regex="REST">
<property name="messageType" value="application/json" scope="axis2" type="STRING"></property>
<send></send>
</case>
<default></default>
</switch>
</onComplete>
</aggregate>
</sequence>
The filter's there to cater for the API implementation of this proxy. And I do need 2 aggregators because I use a clone AND iterator mediator.
So I am wondering why before my second aggregator , the message is being "reset" to an empty soap message and therefore the 2nd agg fails to find //productDetails. See following log entries :
After 1st agg which aggregates shoe prods:
TID: [0] [ESB] [2015-02-27 09:46:24,520] DEBUG {org.apache.synapse.mediators.eip.aggregator.AggregateMediator} - Merging message : <?xml version="1.0" encoding="utf-8"?><soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"><soapenv:Body><productDetails><productID>1124596</productID><productName>REEBOK_SNEAKERS</productName><productSize>7</productSize><productColour>BROWN</productColour><productType>SHOES</productType><sourceID>SHC</sourceID></productDetails></soapenv:Body></soapenv:Envelope> using XPath : //productDetails {org.apache.synapse.mediators.eip.aggregator.AggregateMediator}
TID: [0] [ESB] [2015-02-27 09:46:24,522] DEBUG {org.apache.synapse.mediators.eip.aggregator.AggregateMediator} - Merged result : <?xml version="1.0" encoding="utf-8"?><soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"><soapenv:Body><productDetails><productID>1452168</productID><productName>PUMPS</productName><productSize>7</productSize><productColour>ORANGE</productColour><productType>SHOE</productType><sourceID>SHC</sourceID></productDetails><productDetails><productID>1124596</productID><productName>REEBOK_SNEAKERS</productName><productSize>7</productSize><productColour>BROWN</productColour><productType>SHOES</productType><sourceID>SHC</sourceID></productDetails></soapenv:Body></soapenv:Envelope> {org.apache.synapse.mediators.eip.aggregator.AggregateMediator}
TID: [0] [ESB] [2015-02-27 09:46:24,523] DEBUG {org.apache.synapse.mediators.eip.aggregator.AggregateMediator} - Merging message : <?xml version="1.0" encoding="utf-8"?><soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"><soapenv:Body><productDetails><productID>1123456</productID><productName>NIKE_SHIRTS</productName><productSize>7</productSize><productColour>RED</productColour><productType>SHIRT</productType><sourceID>SHC</sourceID></productDetails></soapenv:Body></soapenv:Envelope> using XPath : //productDetails {org.apache.synapse.mediators.eip.aggregator.AggregateMediator}
TID: [0] [ESB] [2015-02-27 09:46:24,525] DEBUG {org.apache.synapse.mediators.eip.aggregator.AggregateMediator} - Merged result : <?xml version="1.0" encoding="utf-8"?><soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"><soapenv:Body><productDetails><productID>1452168</productID><productName>PUMPS</productName><productSize>7</productSize><productColour>ORANGE</productColour><productType>SHOE</productType><sourceID>SHC</sourceID></productDetails><productDetails><productID>1124596</productID><productName>REEBOK_SNEAKERS</productName><productSize>7</productSize><productColour>BROWN</productColour><productType>SHOES</productType><sourceID>SHC</sourceID></productDetails><productDetails><productID>1123456</productID><productName>NIKE_SHIRTS</productName><productSize>7</productSize><productColour>RED</productColour><productType>SHIRT</productType><sourceID>SHC</sourceID></productDetails></soapenv:Body></soapenv:Envelope> {org.apache.synapse.mediators.eip.aggregator.AggregateMediator}
Then as we are going into 2nd agg :
TID: [0] [ESB] [2015-02-27 09:46:24,545] DEBUG {org.apache.synapse.mediators.eip.aggregator.AggregateMediator} - Generating Aggregated message from : <?xml version="1.0" encoding="utf-8"?><soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"><soapenv:Body><productDetails><noItemFound>No item in Ackerman's</noItemFound></productDetails></soapenv:Body></soapenv:Envelope> {org.apache.synapse.mediators.eip.aggregator.AggregateMediator}
TID: [0] [ESB] [2015-02-27 09:46:24,547] DEBUG {org.apache.synapse.mediators.eip.aggregator.AggregateMediator} - Merging message : <?xml version="1.0" encoding="utf-8"?><soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"><soapenv:Body></soapenv:Body></soapenv:Envelope> using XPath : //productDetails {org.apache.synapse.mediators.eip.aggregator.AggregateMediator}
TID: [0] [ESB] [2015-02-27 09:46:24,550] ERROR {org.apache.synapse.mediators.eip.aggregator.AggregateMediator} - Error evaluating expression: //productDetails {org.apache.synapse.mediators.eip.aggregator.AggregateMediator}
What I want is to merge
<?xml version="1.0" encoding="utf-8"?><soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"><soapenv:Body><productDetails><productID>1452168</productID><productName>PUMPS</productName><productSize>7</productSize><productColour>ORANGE</productColour><productType>SHOE</productType><sourceID>SHC</sourceID></productDetails><productDetails><productID>1124596</productID><productName>REEBOK_SNEAKERS</productName><productSize>7</productSize><productColour>BROWN</productColour><productType>SHOES</productType><sourceID>SHC</sourceID></productDetails><productDetails><productID>1123456</productID><productName>NIKE_SHIRTS</productName><productSize>7</productSize><productColour>RED</productColour><productType>SHIRT</productType><sourceID>SHC</sourceID></productDetails></soapenv:Body></soapenv:Envelope>
with
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"><soapenv:Body><productDetails><noItemFound>No item in Ackerman's</noItemFound></productDetails></soapenv:Body></soapenv:Envelope>
