Complex Choice flow in Mule

  Complex Choice flow in Mule





Content-based routing is used to examine messages and route them to the correct channel or destination depending on a message's content. We use content-based routing when we want to route messages to the right destination.

Choice Flow Control
In Mule, the choice flow control is used to achieve content-based routing where routing will be done based on the message content, like inbound properties, flow variables, and payload. A choice router will always choose only one route. If no route matches, then the default route is used. In a choice router, we use the MEL expression to specify the path for the message.

The choice flow control adds conditional programming to a flow; it is similar to an if/else code block in Java.


Here we are using choice flow control in mule 3 in Anypoint studio 6.2

Here we are routing payload based on 3 parameters id,name and address

Below is the screenshot of choice router conditions :



HTTP Listener Configuration :




path : /testchoice

Below is the flow of choice flow control





URL : http://localhost:8085/api/testchoice
method : POST

 input : 



output :




XML project code :


<?xml version="1.0" encoding="UTF-8"?>

<mule xmlns:tracking="http://www.mulesoft.org/schema/mule/ee/tracking" xmlns:json="http://www.mulesoft.org/schema/mule/json" 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:spring="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-current.xsd
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://www.mulesoft.org/schema/mule/json http://www.mulesoft.org/schema/mule/json/current/mule-json.xsd
http://www.mulesoft.org/schema/mule/ee/tracking http://www.mulesoft.org/schema/mule/ee/tracking/current/mule-tracking-ee.xsd">
    <http:listener-config name="HTTP_Listener_Configuration" host="0.0.0.0" port="8085" doc:name="HTTP Listener Configuration" basePath="/api"/>
    <flow name="test_choiceFlow">
        <http:listener config-ref="HTTP_Listener_Configuration" path="/testchoice" doc:name="HTTP" allowedMethods="POST"/>
        <byte-array-to-string-transformer doc:name="Byte Array to String"/>
        <json:json-to-object-transformer returnClass="java.util.HashMap" doc:name="JSON to Object"/>
        <logger message="#[payload.id == 1]" level="INFO" doc:name="Logger"/>
        <logger message="#[payload.id == '1' &amp;&amp; payload.name == 'Himanshu']" level="INFO" doc:name="Logger"/>
        <choice doc:name="Choice">
         <when expression="#[payload.id == '1' &amp;&amp; payload.name == 'Himanshu' &amp;&amp; payload.address == 'indore']">
                <set-payload doc:name="1 and Himanshu and indore" value="1 and Himanshu and indore"/>
            </when>
          <when expression="#[payload.id == '1' &amp;&amp; payload.name == 'Himanshu']">
                <set-payload value="1 and Himanshu" doc:name="1 and Himanshu"/>
            </when>
            <when expression="#[payload.id == '1']">
                <set-payload value="1" doc:name="1"/>
            </when>
         
            <when expression="#[payload.id == null &amp;&amp; payload.name != null]">
                <set-payload doc:name="id is null and name is not null" value="id is null and name is not null"/>
            </when>
            <when expression="#[payload.isEmpty()]">
                <set-payload value="payload is empty" doc:name="payload is empty"/>
            </when>
       
            <otherwise>
                <set-payload value="in default" doc:name="Default"/>
            </otherwise>
        </choice>
    </flow>
</mule>




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