Choice, Scatter-Gather Router & Foreach in Mule 4

Dear #Trailblazers,

Welcome back, this is the Episode #3 of Mulesoft ranger series and we are going to learn about below topics. Find the agenda for Mulesoft Series Episode #3

Subflow in Mule 4

A subflow is a scope that enables you to group event processors in a manner similar to that of a flow, but with certain differences and limitations:

Subflows do not have event sources.
Subflows do not have an error handling scope.
During design, subflows work as macros that replace the Flow Reference components that call them.
When you build the application, all Flow Reference components that call a subflow are replaced by the contents of the referenced subflow.
Referencing subflows results in better performance than referencing a flow.

Choice Router in Mule 4

The Choice router dynamically routes messages through a flow according to a set of DataWeave expressions that evaluate message content.

Image copyrights to mulesoft.com

Choice Router Schematic — **Image copyrights to mulesoft.com**

Scatter-Gather Router in Mule 4

The routing message processor Scatter-Gather sends a request message to multiple targets concurrently. It collects the responses from all routes, and aggregates them into a single message.

Example: Flight Booking

When you try to bool a flight, you have to enter source, destination and the dates. After clicking on search you many results from various airlines. So to get the data and make it faster ( improve the performance ), behind the scenes all the request are being made in parallel

Connect with Database in mule 4 using connector check this Link.

For Each in mulesoft Mule 4

The For Each scope splits a payload into elements and processes them one by one through the components that you place in the scope. It is similar to a for-each/for loop code block in most programming languages and can process any collection, including lists and arrays. The collection can be any supported content type, such as application/json, application/java, or application/xml.