java ee - How exactly works this enrich mediator chained after a callou mediator in this ESB API flow? -


i new in wso2 , working on ei project involves esb , dss components.

i have following doubt correct meaning of section of api flow:

<?xml version="1.0" encoding="utf-8"?> <sequence name="cropnamessequence" trace="disable" xmlns="http://ws.apache.org/ns/synapse">      <payloadfactory media-type="xml">         <format>             <ds:findcropnames xmlns:ds="http://ws.wso2.org/dataservice">                 <ds:sampleid>$1</ds:sampleid>             </ds:findcropnames>         </format>          <args>             <arg evaluator="xml" expression="$ctx:sampledata//ds:sample/ds:sample_id/text()" xmlns:ds="http://ws.wso2.org/dataservice"/>         </args>     </payloadfactory>      <header name="action" scope="default" value="urn:findcropnames"/>      <callout endpointkey="prgfasendpoint">         <source xmlns:ns="http://org.apache.synapse/xsd" xmlns:s11="http://schemas.xmlsoap.org/soap/envelope/" xmlns:s12="http://www.w3.org/2003/05/soap-envelope" xpath="s11:body/child::*[fn:position()=1] | s12:body/child::*[fn:position()=1]"/>          <target xmlns:ns="http://org.apache.synapse/xsd" xmlns:s11="http://schemas.xmlsoap.org/soap/envelope/" xmlns:s12="http://www.w3.org/2003/05/soap-envelope" xpath="s11:body/child::*[fn:position()=1] | s12:body/child::*[fn:position()=1]"/>     </callout>      <enrich>         <source clone="true" type="envelope"/>         <target property="cropnames" type="property"/>     </enrich>      <log level="custom">         <property expression="$ctx:cropnames" name="crop names"/>     </log>      ........................................................................     ........................................................................     else     ........................................................................     ........................................................................

in code performing following operation:

  • the first payloadfactory mediator used create message containing <ds_sampleid>...</ds_sampleid> parameter retrieved related xpath expression <args>...</args>. message represents request wil send dss service.

  • then specifying header name="action" specify name of dss service used obtain data db (the service name urn:findcropnames.

  • then using callout mediator perform request toward previous web service.

my doubts related following enrich mediator, one:

<enrich>     <source clone="true" type="envelope"/>     <target property="cropnames" type="property"/> </enrich>

in many example see after calling web service using callout mediator chaned enrich mediator.

from understandint meaning of specific mediator (in posted case) tacking envelope of web service response , copying new property name cropnames can use in flows, example can log content of property chaining:

<log level="custom">     <property expression="$ctx:cropnames" name="crop names"/> </log>

is interpretation correct or missing something?

this correct, property of type "om" (xml) created, it's name "cropnames" , belongs default scope (synapse scope) , can access thoses xpath : get-property('cropnames') or $ctx:cropnames


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