This document describes sharing data between two Mule applications using an object store in MuleSoft ESB. Application 1 stores data in the object store using a POST request. Application 2 retrieves all stored data from the object store using a GET request and logs and returns the payload. The object store is configured at the domain-level and shared between both applications to enable sharing data across applications in the same Mule domain.

1. MuleSoft ESB
Sharing Data Across Mule Applications
By
AKASH PRAJAPATI

2. Scripting Support
Topics :
•Sharing Data Across Mule Applications
Purpose :
- To showcase object store functionality in MuleSoft ESB.
- Using object store, Two different Mule Application shared data.
Pre-requisites :
•Basic under standing of Mule ESB
•JDK 1.8 or above
•Anypoint Studio v 6.2.1 or above
•Mule Server v 3.8.0 EE or above

3. Details :
(*) Domain Project :
Common resources are placed into this project
(*) Mule Project – 1 :
This Application can store data in the Common Shared Memory – ( Called Object Store )
(*) Mule Project – 2 :
This Application will retrieve all data which are stored in common shared memory – ( Called Object Store )

4. Flow Details : MULE_DOMAIN_PROJECT
<?xml version="1.0" encoding="UTF-8"?>
<domain:mule-domain
xmlns="http://www.mulesoft.org/schema/mule/core"
xmlns:domain="http://www.mulesoft.org/schema/mule/ee/domain"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:spring="http://www.springframework.org/schema/beans"
xmlns:doc="http://www.mulesoft.org/schema/mule/documentation"
xmlns:http="http://www.mulesoft.org/schema/mule/http"
xsi:schemaLocation="
http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-current.xsd
http://www.mulesoft.org/schema/mule/ee/domain http://www.mulesoft.org/schema/mule/ee/domain/current/mule-domain-ee.xsd
http://www.mulesoft.org/schema/mule/http http://www.mulesoft.org/schema/mule/http/current/mule-http.xsd">
<!-- configure here resource to be shared within the domain -->
<http:listener-config name="HTTP_Listener_Configuration" host="0.0.0.0" port="9091" doc:name="HTTP Listener Configuration" />
<spring:beans>
<spring:bean id="mySimpleMemoryObjectStore" class="org.mule.util.store.SimpleMemoryObjectStore" />
</spring:beans>
</domain:mule-domain>

5. <?xml version="1.0" encoding="UTF-8"?>
<mule xmlns:objectstore="http://www.mulesoft.org/schema/mule/objectstore"
xmlns:json="http://www.mulesoft.org/schema/mule/json"
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.mulesoft.org/schema/mule/json http://www.mulesoft.org/schema/mule/json/current/mule-json.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-current.xsd
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/objectstore http://www.mulesoft.org/schema/mule/objectstore/current/mule-objectstore.xsd">
<objectstore:config name="ObjectStore" objectStore-ref="mySimpleMemoryObjectStore" doc:name="ObjectStore" />
<flow name="mule_app1_projectFlow">
<http:listener config-ref="HTTP_Listener_Configuration" path="/app1/set" doc:name="HTTP" />
<logger level="INFO" message="#['======================= START : APP1 =================================']" doc:name="Logger"/>
<json:json-to-object-transformer returnClass="java.util.HashMap" doc:name="JSON to Object" />
<set-variable variableName="objStrSize" value="#[app.registry.mySimpleMemoryObjectStore.allKeys().size()]" doc:name="Set Count" />
<objectstore:store config-ref="ObjectStore" key="#[new java.lang.Integer(flowVars['objStrSize']+1)]" value-ref="#[payload]" doc:name="Add To ObjectStore"/>
<set-payload value="Payload stored in ObjectStore...!!!" doc:name="Set Payload" />
<!-- <object-to-byte-array-transformer doc:name="Object to Byte Array" /> -->
<logger level="INFO" message="#[payload]" doc:name="Logger"/>
<logger level="INFO" message="#['======================= END : APP1 =================================']" doc:name="Logger"/>
</flow>
</mule>
Flow Details : MULE_APP1_PROJECT

6. Flow Details : MULE_APP2_PROJECT
<?xml version="1.0" encoding="UTF-8"?>
<mule xmlns:objectstore="http://www.mulesoft.org/schema/mule/objectstore"
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-current.xsd
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/objectstore http://www.mulesoft.org/schema/mule/objectstore/current/mule-objectstore.xsd">
<objectstore:config name="ObjectStore" objectStore-ref="mySimpleMemoryObjectStore" doc:name="ObjectStore" />
<flow name="mule_app2_projectFlow">
<http:listener config-ref="HTTP_Listener_Configuration" path="/app2/getall" doc:name="HTTP"/>
<logger level="INFO" message="#['======================= START : APP2 =================================']" doc:name="Logger"/>
<set-variable variableName="varAllData" value="#[new java.util.ArrayList()]" doc:name="Variable - Message Arraylist"/>
<foreach collection="#[app.registry.mySimpleMemoryObjectStore.allKeys()]" doc:name="For Each" counterVariableName="i">
<objectstore:retrieve config-ref="ObjectStore" key="#[new java.lang.Integer(i)]" doc:name="Retrieve Message"/>
<object-to-string-transformer doc:name="Object to String" />
<logger message="Values #[new java.lang.Integer(i)] : #[message.payload]" level="INFO" doc:name="Logger" />
<expression-component doc:name="Add Message to ArrayList">
<![CDATA[flowVars['varAllData'].add(payload)]]>
</expression-component>
</foreach>
<set-payload doc:name="Set Payload" value="#[flowVars['varAllData']] "/>
<logger level="INFO" message="#['==================================']" doc:name="Logger"/>
<logger level="INFO" message="#[payload]" doc:name="Logger"/>
<logger level="INFO" message="#['==================================']" doc:name="Logger"/>
<logger level="INFO" message="#['======================= END : APP2 =================================']" doc:name="Logger"/>
</flow>
</mule>

7. Testing / Logger Information:
------------------------ Thank You -------------------------
(*) Steps : Execute below URLs.
PROJECT-1 :
Input :
http://localhost:9091/app1/set
Method : POST
Content-Type : application/json
Data : { “id” : “001” , “firstname” : “PRAKASH” }
Output :
Payload stored in ObjectStore...!!!
PROJECT-2 :
Input :
http://localhost:9091/app2/getall
Method : GET
Output:
[ { id=001, firstname=PRAKASH } ]
(*) Validate Log and Payload values