Sub Flow in Mule 4 | Flow Reference in Mule 4

Sub flow in Mule 4 | Flow Reference in Mule 4

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:

1) Subflows do not have event sources.

2) Subflows do not have an error handling scope.

3) During design, sub-flow works as macros that replace the Flow Reference components that call them. When you build the application, all Flow Reference components that call a sub-flow are replaced by the contents of the referenced sub-flow.

4) Referencing sub-flows results in better performance than referencing a flow.

We can connect main flow with sub-flow in mule 4 via flow reference component.

Example:

URL: http://localhost:8085/ref

Method: GET

Output:

XML project code:

<?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:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="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_config" doc:name="HTTP Listener config" doc:id="a4e501b9-6daa-4b7e-b0d5-af8f71e4538d" >

<http:listener-connection host="0.0.0.0" port="8085" />

</http:listener-config>

<http:listener doc:name="Listener" doc:id="3d4b5b66-8d9b-4742-b6aa-998272ea1905" config-ref="HTTP_Listener_config" path="/ref"/>

<set-variable value="1" doc:name="Set Variable" doc:id="33ba4c59-98fd-44bb-a2ad-1847506b4ab0" variableName="var1"/>

<flow-ref doc:name="Flow Reference" doc:id="f12a2f26-411d-4819-ae5d-7748d744a562" name="test_subflowSub_Flow"/>

</flow>

<sub-flow name="test_subflowSub_Flow" doc:id="3cdc536a-c92b-4217-88be-b58e224c6824" >

</sub-flow>

</mule>

XML to JSON in mule 4	Web service consumer	VM	Validation in Mule 4	Until Successful
Sub flow	Set Variable & Remove Variable	Set Transaction ID	Scatter Gather	Round Robin
Consume Restful Service	CRUD in Mule 4	Parse Template	Object to JSON	Load Static Resource
JSON to XML	Invoke	Idempotent Filter	ForEach	Flat file to JSON
Fixwidth to JSON	First Successful	File	Execute	Error Handling
Email	Dynamic Evaluate	Custom Business Event	CSV to JSON	Copybook to JSON
Choice Router	Async	RabbitMQ

Database Connector	Async	CXF	Attachement	XSLT
Mongo DB	Cache scope	Custom Business Event	Gzip Compress	Expression
SMTP	For Each	Expression	Javascript	Filter Reference
Salesforce	Message Enricher	Groovy	Parse Template	Idempotent
VM	Poll	Invoke	Ruby	Message
Webservice consumer	Python	Transformer reference	Message Property	Not
Collection Aggregator	First Sucessful	Catch Exception Strategy	Reference Exception Strategy	Or
Choice	Message Chunk Aggregator	Choice Exception Strategy	Global Exception Strategy	Schema Validation
Custom Aggregator	Scatter Gather	Custom Exception Strategy	Batch Processing	MEL
M Unit	RAML	Map Operator	API Mocking	Dataweave