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Basic Example using Choice component

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Abstract

Simple basic example to know how to use Choice component in mule studio/anypoint.

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Introduction

The choice flow control dynamically routes messages based on message payload or properties. It adds conditional programming to a flow, similar to an if/then/else code block.

A choice flow control uses expressions to evaluate the content of a message, then it routes the message to one of the routing options within its scope

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Basic Flow

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<?xml version="1.0" encoding="UTF-8"?><mule xmlns:tracking="http://www.mulesoft.org/schema/mule/ee/tracking" xmlns:http="http://www.mulesoft.org/schema/mule/http" xmlns:vm="http://www.mulesoft.org/schema/mule/vm" 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" version="EE-3.6.1" 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.xsdhttp://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsdhttp://www.mulesoft.org/schema/mule/vm http://www.mulesoft.org/schema/mule/vm/current/mule-vm.xsdhttp://www.mulesoft.org/schema/mule/http http://www.mulesoft.org/schema/mule/http/current/mule-http.xsdhttp://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="8081" doc:name="HTTP Listener Configuration"/> <flow name="UsingChoiceRouter" > <http:listener config-ref="HTTP_Listener_Configuration" path="/choice" doc:name="HTTP"/> <set-payload value="#[message.inboundProperties.'http.query.params'.Mule]" doc:name="Set Payload"/> <choice doc:name="Choice"> <when expression="#[payload=='True']"> <logger message="True--#[payload]" level="INFO" doc:name="True"/> </when> <otherwise> <logger message="False--#[payload]" level="INFO" doc:name="False"/> </otherwise> </choice> </flow></mule>

FLOW:

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URL: http://localhost:8081/choice/?Mule=True

Output:INFO 2015-10-10 01:24:45,192 [[poc].HTTP_Listener_Configuration.worker.01] org.mule.api.processor.LoggerMessageProcessor: True—True

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Trigger : http://localhost:8081/choice/?Mule=TrueWe are setting the payload coming from http request.By using #[message.inboundProperties.'http.query.params'.Mule]The value for Mule is TrueIn Choice router:For True condition: #[payload=='True']For False Condition we are setting it default.

If we pass Mule=True, condition will satisfy and selected code will be executed.If false(Mule=any value), code will be executed in default.

Execution:

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References

https://docs.mulesoft.com/mule-user-guide/v/3.5/choice-flow-control-reference#changing-the-default-route

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Thank You