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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:


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>
       <flow name="test_subflowFlow" doc:id="1a446e09-90cc-49a2-9ce7-b90bddedb3db" >
              <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" >
              <logger level="INFO" doc:name="Logger" doc:id="a6287bb5-0ee2-42cd-9107-e2593e2f4503" message="#[vars.var1]"/>
       </sub-flow>
</mule>

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Please go through below tutorials:


Mule 4 Tutorials

DEPLOY TO CLOUDHUB C4E CLIENT ID ENFORCEMENT CUSTOM POLICY RABBIT MQ INTEGRATION
XML TO JSON WEBSERVICE CONSUMER VM CONNECTOR VALIDATION UNTIL SUCCESSFUL
SUB FLOW SET & REMOVE VARIABLE TRANSACTION ID SCATTER GATHER ROUND ROBIN
CONSUME REST WEBSERVICE CRUD OPERATIONS PARSE TEMPLATE OBJECT TO JSON LOAD STATIC RESOURCE
JSON TO XML INVOKE IDEMPOTENT FILTER FOR EACH FLAT TO JSON
FIXWIDTH TO JSON FIRST SUCCESSFUL FILE OPERATIONS EXECUTE ERROR HANDLING
EMAIL FUNCTIONALITY DYNAMIC EVALUATE CUSTOM BUSINESS EVENT CSV TO JSON COPYBOOK TO JSON
CHOICE ASYNC

Widely used Connectors in Mule 3

CMIS JETTY VM CONNECTOR SALESFORCE POP3
JMS TCP/IP WEBSERVICE CONSUMER QUARTZ MONGO DB
FILE CONNECTOR DATABASE CONNECTOR


Widely used Scopes in Mule 3

SUB FLOW REQUEST REPLY PROCESSOR CHAIN FOR EACH CACHE
ASYNC TCP/IP COMPOSITE SOURCE POLL UNTIL SUCCESSFUL
TRANSACTIONAL FLOW

Widely used Components in Mule 3

EXPRESSION CXF SCRIPT RUBY PYTHON
JAVASCRIPT JAVA INVOKE CUSTOM BUSINESS EVENT GROOVY
ECHO LOGGER


Widely used Transformers in Mule 3

MONGO DB XSLT TRANSFORMER REFERENCE SCRIPT RUBY
PYTHON MESSAGE PROPERTIES JAVA TRANSFORMER GZIP COMPRESS/UNCOMPRESS GROOVY
EXPRESSION DOM TO XML STRING VALIDATION COMBINE COLLECTIONS BYTE ARRAY TO STRING
ATTACHMENT TRANSFORMER FILE TO STRING XML TO DOM APPEND STRING JAVASCRIPT
JSON TO JAVA COPYBOOK TO JSON MAP TO JSON JSON TO XML FLATFILE TO JSON
FIXWIDTH TO JSON CSV TO JSON


Widely used Filters in Mule 3

WILDCARD SCHEMA VALIDATION REGEX PAYLOAD OR
NOT MESSAGE PROPERTY MESSAGE IDEMPOTENT FILTER REFERNCE
EXPRESSION EXCEPTION CUSTOM AND


Exception Strategy in Mule 3

REFERENCE EXCEPTION STRATEGY CUSTOM EXCEPTION STRATEGY CHOICE EXCEPTION STRATEGY CATCH EXCEPTION STRATEGY GLOBAL EXCEPTION STRATEGY


Flow Control in Mule 3

CHOICE COLLECTION AGGREGATOR COLLECTION SPLITTER CUSTOM AGGREGATOR FIRST SUCCESSFUL
MESSAGE CHUNK AGGREGATOR MESSAGE CHUNK SPLITTER RESEQUENCER ROUND ROBIN SOAP ROUTER