MULTICASTING (SCATTER-GATHER) MESSAGES WITH MULESOFT

SCATTER GATHER

MULTICASTING OF MESSAGE WITH MULESOFT CAN BE ACHIEVED USING SCATTER GATHER

WHICH CONCURRENTLY CAST THE MESSAGE TO EACH ROUTES AND IT COLLECTS RESULTS FROM

ALL THE ROUTES AND AGGREGATES INTO A SINGLE MESSAGE.

DURING PROCESSING OF SCATTER GATHER PROCESSING, IF ANY OF THE ROUTES FAILED, IT

DOESN'T STOP SENDING MESSAGE TO OTHER CONFIGURED ROUTES, SO IT IS POSSIBLE THAT

ONE OR MORE CONFIGURED ROUTES FAILS CONCURRENTLY.

BY DEFAULT, IF ANY OF THE ROUTER FAILS DURING SCATTER GATHER PROCESSING, THE

FOLLOWING ACTION WILL BE PERFORMED.

• SET A EXCEPTION PAYLOAD FOR EACH FAILED ROUTE.

• THROWS A COMPOSITEROUTINGEXCEPTION.

SCATTER GATHER

COMPOSITEROUTINGEXCEPTION EXTENDS MESSAGINGEXCEPTION TO AGGREGATE

EXCEPTIONS FROM DIFFERENT ROUTE IN THE CONTEXT OF A SINGLE MESSAGE ROUTER.

EXCEPTIONS ARE CORRELATED TO EACH ROUTE THROUGH A SEQUENTIAL ID.

SCATTER GATHER APPLICATION WILL NOT START IF YOU HAVE CONFIGURED WITH LESS THAN

TWO ROUTES. IT SHOULD ALWAYS CONTAINS TWO OR MORE ROUTES.

LET'S WALKTHROUGH SETTING UP SCATTER GATHER WITH MULE APPLICATION.

SCATTER GATHER

SETTING UP HTTP LISTENER WITH MULE FLOW

NOW FIRST YOU NEED TO PLACE THE HTTP LISTENER TO THE SOURCE OF MULE FLOW AND

CONFIGURE IT. SO YOU CAN INVOKE MULE FLOW BY SENDING A REQUEST OVER HTTP.

SCATTER GATHER

CONFIGURING SCATTER GATHER ROUTE WITH MULE FLOW

NOW YOU NEED TO DROP SCATTER GATHER ROUTE IN MESSAGE PROCESSOR OF MULE FLOW.

NOW YOU NEED TO SEND A MESSAGE CONCURRENTLY TO MULTIPLE ROUTES VIA HTTP, JMS,

WEB SERVICE CONSUMER, FILE ETC. TO ACHIEVE THIS WE WILL ADD DIFFERENT CONNECTORS

UNDER SCATTER GATHER ROUTE AND PLACING THEM PARALLELLY AND CONFIGURE ALL THE

CONNECTORS IN SCATTER GATHER ROUTE.

SCATTER GATHER

IN PREVIOUS SCREENSHOT, YOU CAN SEE TRANSFORMMESSAGE HAS BEEN USED AFTER WEB

SERVICE CONSUMER AND HTTP REQUESTOR. BASICALLY WE ARE GETTING RESULT BACK FROM

BOTH ENDPOINTS AND WE ARE TRANSFORMING BOTH RESPONSE TO SINGLE GENERIC FORMAT

AS RESPONSE FROM BOTH ROUTE WILL BE IN DIFFERENT FORMAT.

ONE MORE TRANSFORM HAS BEEN PLACED AT THE END OF SCATTER GATHER ROUTE, IT IS

BECAUSE THIS TRANSFORM WILL AGGREGATES THE RESULT FROM ALL THE ROUTES TO SINGLE

MESSAGE.

TESTING THE APPLICATION

YOU CAN USE THE POSTMAN TO TEST THE APPLICATION. SO WE WILL USE HTTP GET METHOD

TO SEND REQUEST TO INVOKE MULE FLOW.

THANK YOU