Mule message enricher
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The Mule Message Enricher allows processing of the message without modifying the original payload. It provides a scope to add message processors that perform tasks like calling external services and extracting values from the response, without changing the original message. For example, a flow can use the enricher to call a web service, extract a value from the response into a variable, and log both the variable and original payload at the end, keeping the payload unchanged throughout.
Mule message enricher
- 1. By Anirban Sen Chowdhary
- 2. Mule Message Enricher is an important component in Mule. The Mule Message Enricher allows the current message to be used in performing a particular task separately without disturbing the original message. The task will be performed and the current message will not be changed or disturbed
- 3. So, how can we use Message Enricher in Mule ????
- 4. Mule Message Enricher is the block or scope where we can put our message processors that will perform a certain task without modifying the actual payload
- 5. Let’s consider a flow where we will set a payload and call an external service, extract a value of an element from response and will log the extracted value from the response as well as the original payload at the end of the flow
- 6. Our Mule Config will be :- You can see that we are calling an external web service, getting it’s response, extracting an element value from the response and storing into a variable. At the end of the flow we are logging both the variable and undisturbed original payload
- 7. This is how it works :- You can see the Original payload which is a SOAP request for the external service is undisturbed and can be logged at the end of the flow in a logger. In mean time the payload is used in the Message Enricher block to call the external service, transformed into SOAP XML, and extract a value from SOAP response using XPATH and stored in a flow variable
- 8. To test the application, if we hit the url http://localhost:8081/test , we will get in our log :- You can see in logs both the variable and the original payload are logged in console
- 9. In my next slide I will bring some other techniques in Mule implementation . Hope you have enjoyed this simpler version.