The document discusses different ways to enrich messages in Mule including enriching flow variables, message headers, and using enricher tags. It provides examples of enriching payload with additional information from external resources like another flow, HTTP request, or static expression.

1. *

2. *One common scenario involves the need to enrich an
incoming message with information that isn’t provided by
the source system
*Mule currently supports enrichment of flow variables and
message headers only.
*The “enrichment resource” can be any message
processor, outbound connector, processor-chain or
flow-ref.
*By having inline enrich tags for multiple targets

3. * <?xml version="1.0" encoding="UTF-8"?>
* <mule xmlns:json="http://www.mulesoft.org/schema/mule/json" xmlns:data-mapper="http://www.mulesoft.org/schema/mule/ee/data-mapper"
xmlns:tracking="http://www.mulesoft.org/schema/mule/ee/tracking" xmlns:mulexml="http://www.mulesoft.org/schema/mule/xml"
xmlns:http="http://www.mulesoft.org/schema/mule/http" xmlns="http://www.mulesoft.org/schema/mule/core"
xmlns:doc="http://www.mulesoft.org/schema/mule/documentation"
* xmlns:spring="http://www.springframework.org/schema/beans"
* xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
* xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-curre
* http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd
* http://www.mulesoft.org/schema/mule/http http://www.mulesoft.org/schema/mule/http/current/mule-http.xsd
* http://www.mulesoft.org/schema/mule/xml http://www.mulesoft.org/schema/mule/xml/current/mule-xml.xsd
* http://www.mulesoft.org/schema/mule/ee/tracking http://www.mulesoft.org/schema/mule/ee/tracking/current/mule-tracking-ee.xsd
* http://www.mulesoft.org/schema/mule/ee/data-mapper http://www.mulesoft.org/schema/mule/ee/data-mapper/current/mule-data-mapper.xsd
* http://www.mulesoft.org/schema/mule/json http://www.mulesoft.org/schema/mule/json/current/mule-json.xsd">
* <http:listener-config name="HTTP_Listener_8124" host="localhost" port="8124" doc:name="HTTP Listener Configuration"/>
* <data-mapper:config name="XML_To_XML" transformationGraphPath="xml_to_xml.grf" doc:name="XML_To_XML"/>
* <http:request-config name="HTTP_Request_Configuration" host="localhost" port="8124" doc:name="HTTP Request Configuration"/>
* <flow name="encricherFlow">
* <http:listener config-ref="HTTP_Listener_8124" path="/enricher" doc:name="HTTP"/>
* <mulexml:dom-to-xml-transformer doc:name="DOM to XML"/>
* <enricher doc:name="Message Enricher">
* <flow-ref name="assign_state_using_zip" doc:name="get state variable"/>
* <enrich target="#[sessionvariable:newState]" source="#[xpath://enrichedPayload/state]"/>
* <!-- <enrich target="#[variable:newState]" source="#[xpath://enrichedPayload/state]"/> -->
* <enrich target="#[variable:country]" source="#[xpath://enrichedPayload/country']"/>
* </enricher>
*

4. * <logger doc:name="Logger"/>
* <data-mapper:transform config-ref="XML_To_XML" doc:name="XML To XML">
* <data-mapper:input-arguments>
* <data-mapper:input-argument key="CountryCode">#[flowVars.country]</data-mapper:input-argument>
* <data-mapper:input-argument key="State">#[sessionVars.newState]</data-mapper:input-argument>
* </data-mapper:input-arguments>
* </data-mapper:transform>
* </flow>
* <sub-flow name="assign_state_using_zip">
* <expression-component doc:name="Andhra"><![CDATA[String response="<enrichedPayload>";
* if( xpath3("//address/zip").equals("518001")){
* response += "<state>AP</state>";
* }
* else if(xpath3("//address/zip").equals("500001")){
* response += "<state>TS</state>";
* }
* else{
* response += "<state>INVALID STATE</state>";
* }
* if( xpath3("//address/country").equalsIgnoreCase("INDIA")){
* response += "<country>+91</country>";
* }
* else if(xpath3("//address/country").equalsIgnoreCase("UK")){
* response += "<state>+44</state>";
* }
* else{
* response += "<state>INVALID Country</state>";
* }
* response += "</enrichedPayload>";
*

5. * payload = response;
* System.out.println("Enriched Payload is::"+payload);]]></expression-component>
* </sub-flow>
* <flow name="complexencricherFlow">
* <http:listener config-ref="HTTP_Listener_8124" path="/complexenricher" doc:name="HTTP"/>
* <mulexml:dom-to-xml-transformer doc:name="DOM to XML"/>
* <enricher doc:name="Message Enricher" target="#[flowVars.state]" source="#[xpath2://address/state]">
* <processor-chain doc:name="Processor Chain">
* <http:request config-ref="HTTP_Request_Configuration" path="/state" method="POST" doc:name="HTTP"/>
* <mulexml:dom-to-xml-transformer doc:name="DOM to XML"/>
* </processor-chain>
* </enricher>
* <data-mapper:transform config-ref="XML_To_XML" doc:name="XML To XML">
* <data-mapper:input-arguments>
* <data-mapper:input-argument key="State">#[flowVars.state]</data-mapper:input-argument>
* </data-mapper:input-arguments>
* </data-mapper:transform>
* </flow>
*

6. * <flow name="muleencricherFlow">
* <http:listener config-ref="HTTP_Listener_8124" path="/state" doc:name="HTTP"/>
* <mulexml:dom-to-xml-transformer doc:name="DOM to XML"/>
* <expression-transformer doc:name="Expression">
* <return-argument evaluator="xpath2" expression="/address/zip"/>
* </expression-transformer>
* <choice doc:name="evaluate zip and assingn a state">
* <when expression="#[payload =='518001']">
* <set-payload value="&lt;address&gt;&lt;state&gt;AP&lt;/state&gt;&lt;/address&gt;" doc:name="Set Payload"/>
* </when>
* <when expression="#[payload =='500043']">
* <set-payload value="&lt;address&gt;&lt;state&gt;TS&lt;/state&gt;&lt;/address&gt;" doc:name="Set Payload"/>
* </when>
* <otherwise>
* <set-payload value="&lt;address&gt;&lt;state&gt;Andhra&lt;/state&gt;&lt;/address&gt;" doc:name="Set Payload"/>
* </otherwise>
* </choice>
* </flow>
* </mule>

7. *
*Thank You