This section explains, through an example scenario, how the Normalizer EIP can be implemented using WSO2 ESB. The following topics are covered:
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<definitions xmlns="http://ws.apache.org/ns/synapse"> <!-- The proxy service to receive all kinds of messages --> <proxy name="ServiceProxy" transports="https http" startOnLoad="true" trace="disable"> <description/> <target> <inSequence> <log level="full"/> <!-- Filters incoming JSON messages --> <filter xmlns:m0="http://services.samples" xpath="//m0:getQuote/m0:request/m0:symbol"> <then> <sequence key="sendSeq"/> </then> <else> <sequence key="jsonInTransformSeq"/> </else> </filter> </inSequence> <outSequence> <!-- Filters outgoing JSON messages --> <filter source="get-property('TRANSFORMATION')" regex="JSONtoSOAP"> <then> <property name="messageType" value="application/json" scope="axis2" type="STRING"/> </then> </filter> <log level="full"/> <send/> </outSequence> </target> </proxy> <localEntry key="in_transform"> <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:fn="http://www.w3.org/2005/02/xpath-functions" xmlns:m0="http://services.samples" version="2.0" exclude-result-prefixes="m0 fn"> <xsl:output method="xml" omit-xml-declaration="yes" indent="yes"/> <xsl:template match="*"> <xsl:element name="{local-name()}" namespace="http://services.samples"> <xsl:copy-of select="attribute::*"/> <xsl:apply-templates/> </xsl:element> </xsl:template> </xsl:stylesheet> </localEntry> <!-- Transform a JSON message --> <sequence name="jsonInTransformSeq"> <xslt key="in_transform"/> <property name="TRANSFORMATION" value="JSONtoSOAP" scope="default" type="STRING"/> <enrich> <source clone="true" xmlns:m0="http://services.samples" xmlns:ns="http://org.apache.synapse/xsd" xpath="//m0:getQuote"/> <target type="body"/> </enrich> <header name="Action" scope="default" value="urn:getQuote"/> <sequence key="sendSeq"/> </sequence> <!-- Normal flow of messages --> <sequence name="sendSeq"> <send> <endpoint> <address uri="http://localhost:9000/services/SimpleStockQuoteService" format="soap11"/> </endpoint> </send> </sequence> <sequence name="fault"> <log level="full"> <property name="MESSAGE" value="Executing default 'fault' sequence"/> <property xmlns:ns="http://org.apache.synapse/xsd" name="ERROR_CODE" expression="get-property('ERROR_CODE')"/> <property xmlns:ns="http://org.apache.synapse/xsd" name="ERROR_MESSAGE" expression="get-property('ERROR_MESSAGE')"/> </log> <drop/> </sequence> <sequence name="main"> <log/> <drop/> </sequence> </definitions> |
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Simulating the sample scenario
You can test this configuration for JSON, SOAP, and POX messages using the sample Axis2 client that comes with WSO2 ESB. You can find examples below.
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