Can you write an "if" statement in Mule ESB?

Question

I have an abstract-message-processor I built that I want to encapsulate inside of a boolean evaluation so that I can turn it off under certain conditions. I'm looking to write something like this:

<flow name="myFlow">
    <if expression="${myFlag} == true">
        <mynamespace:myCustomMessageProcessor .../>
    </if>
</flow>

Is this possible in Mule ESB? Is there an example I can review?

From what I see here http://stackoverflow.com/questions/13094092/how-to-kick-off-a-mule-flow-to-read-messages-from-a-jms-queue-using-an-http-endp you could use `` — Alex, Mar 07 '13 at 17:00
Do you want to perform any action after the "if" in this flow? — David Dossot, Mar 07 '13 at 17:25
No, I only want to invoke the message processor under certain conditions. I don't need any other actions. — TERACytE, Mar 07 '13 at 17:35
Alex, it looks like this would work. And here I was searching for ht e work "if/then" in the Mule documentation, instead of "choice" :) Can you post your answer as an official answer to my question? — TERACytE, Mar 13 '13 at 19:55

score 2 · Answer 1 · answered Mar 10 '13 at 20:55

2

This is a standard content-based routing pattern present in all ESB products.

In Mule, you want to use Choice Router - see e.g. Mule School: Using Flow Controls – Choice Router tutorial.

answered Mar 10 '13 at 20:55

Aleš

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Anirban Sen Chowdhary · Answer 2 · 2015-08-13T04:28:46.160

If you want to use IF condition reading the value from a properties file you can do the following :-

<scripting:component doc:name="Groovy" doc:description="This component is used to check the value from properties file" >
  <scripting:script engine="Groovy">
     // use your if else code here like  
     if(${myFlag} == true)
         {      
         return message.payload
         }
   </scripting:script>
 </scripting:component>

Let me know it worked or not ....

score 0 · Answer 3 · answered Jan 17 '15 at 01:27

0

Mule Choice Router is the apt option for using the if else or if elseif implementation. Even you make use of expressions to achieve the same.

answered Jan 17 '15 at 01:27

ARUN KUMAR

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score 0 · Answer 4 · answered Jun 23 '19 at 15:32

Mule allows the condition check by using the <choice> router. You can define different <when> and one <othterwise> condition for fallback decisions.

<choice doc:name="Choice condition">
  <when expression="#[flowVars.myVar = 'on']">
    <logger level="INFO" message="Case: myVar is on" />
  </when>
  <when expression="#[flowVars.myVar = 'off']">
    <logger level="INFO" message="Case: myVar is off" />
  </when>
  <otherwise>
    <logger level="INFO" message="Case: otherwise the default route is used" />
  </otherwise>
</choice>

Can you write an "if" statement in Mule ESB?

4 Answers4