![Mule ESB – An ESB for the Modern Enterprise
<?xml version="1.0" encoding="UTF-8"?>
<mule 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:listener-config name="HTTP_Listener_Configuration" host="0.0.0.0" port="8081" doc:name="HTTP Listener Configuration"/>
<flow name="idempotent-filterFlow">
<http:listener config-ref="HTTP_Listener_Configuration" path="/textfilestoreTest" doc:name="HTTP"/>
<idempotent-message-filter doc:name="Idempotent Message" throwOnUnaccepted="true" idExpression="#[message:payload]">
<simple-text-file-store directory="./idempotent"/>
</idempotent-message-filter>
<logger level="INFO" doc:name="Logger" message="Idempotent Message Passed inside Log"/>
<set-payload doc:name="Set Payload" value="Idempotent Message Passed inside payload"/>
<catch-exception-strategy doc:name="Catch Exception Strategy">
<set-payload value=" Exception : Duplicate message!" doc:name="Set Payload"/>
</catch-exception-strategy>
</flow>
</mule>
Mule XML Configuration
4](https://image.slidesharecdn.com/muleidempotentfilter-partii-170803043321/85/Mule-Idempotent-Filter-Part-II-5-320.jpg)
Mule Idempotent Filter - Part II
- 1. Mule Idempotent Filter Part II RAMANAN T D Mule ESB – An ESB for the Modern Enterprise
- 2. Mule ESB – An ESB for the Modern Enterprise We’ll see how message uniqueness can be achieved through simple-text-file-store with a sample use case in this presentation. Idempotent Filter using simple-text-file-store 1
- 3. Mule ESB – An ESB for the Modern Enterprise Consider there is a link with unique uri parameter i.e. basically it contains unique key to validate user request. With the help of message idempotent filter each request will be validated. URI for uniqueness: http://localhost:8081/textfilestoreTest Here textfilestoreTest is considered as unique endpoint for a particular request. Use Case - Idempotent Filter using simple-text-file-store 2
- 4. Mule ESB – An ESB for the Modern Enterprise Flow: Idempotent Message filter as simple-text-file-store 3
- 5. Mule ESB – An ESB for the Modern Enterprise <?xml version="1.0" encoding="UTF-8"?> <mule 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:listener-config name="HTTP_Listener_Configuration" host="0.0.0.0" port="8081" doc:name="HTTP Listener Configuration"/> <flow name="idempotent-filterFlow"> <http:listener config-ref="HTTP_Listener_Configuration" path="/textfilestoreTest" doc:name="HTTP"/> <idempotent-message-filter doc:name="Idempotent Message" throwOnUnaccepted="true" idExpression="#[message:payload]"> <simple-text-file-store directory="./idempotent"/> </idempotent-message-filter> <logger level="INFO" doc:name="Logger" message="Idempotent Message Passed inside Log"/> <set-payload doc:name="Set Payload" value="Idempotent Message Passed inside payload"/> <catch-exception-strategy doc:name="Catch Exception Strategy"> <set-payload value=" Exception : Duplicate message!" doc:name="Set Payload"/> </catch-exception-strategy> </flow> </mule> Mule XML Configuration 4
- 6. Mule ESB – An ESB for the Modern Enterprise Let us starting testing our application Note: For the first time we will see browser display "Idempotent Message Passed inside payload" as the message payload is new and unique Testing – Initial Request 5
- 7. Mule ESB – An ESB for the Modern Enterprise For the second time we will see browser display “EXCEPTION: Duplicate message Found” as the message payload is now same and duplicate Testing – Second Request 6
- 8. Mule ESB – An ESB for the Modern Enterprise Object store location inside Idempotent Filter 7 Note: The object store location specified inside Idempotent Message filter settings contains messages with unique ID