Mulesoft Murmurings

Introduction

This blog is a series of tips, tricks and how to's relating to developing APIs in Mulesoft Anypoint Studio.

MEL Expressions

Create a boolean IF THEN statement

In MEL expression, the ? creates an if statement based on the expression before it.

#[flowVars.flowName == empty ? "updateCustomer"]

To add a else clause, add : after setting the if condition.

#[flowVars.flowName == empty ? "updateCustomer" :  flowVars.flowName + "->updateCustomer"]

How to's 

Add time taken to a http flow

1.) Add a variable component at the beginning of the flow.

2.) Set the Value to  #[System.currentTimeTimeMillis()]

3.) Set the Name to 'flowName'+StartTime. (FLOWNAME MUST BE UNIQUE)

4.) Add a logger component at the end of the flow.

5.) Set Value  #[timeTaken=#[System.currentTimeMillis() - flowVars.flownameStartTime]]

NOTE: FlowName variable cannot contain - (dash) or _ (underscore), or it will give a 500 error when the API is called.

Choice Exception Strategy Setup

To correctly check which exception has been raised in a choice exception routing strategy:

#[exception.causedBy(org.mule.module.apikit.exception.NotFoundException)]

Mock Salesforce data for MUNIT Test

Gotcha!: If you have multiple salesforce connector in a single mule-configuration file, be sure each one has a unique name! Otherwise the test will execute all flows that contain a salesforce connector with the name in the MUnit test.

1.) Create a Unit test, adding a mock , set message etc.

2.) create a new Java source file under /src/test/java. (You can create a package if you want)

3.) create a new public class as shown below:

public class MockDataHelper {

    public static Map<String,Object> mockSalesforceAccount(){

        Map<String, Object> data = new HashMap<String, Object>();

        data.put("Id", "a2tO0000003fmNXIAY");

        data.put("CustomerId__c", "ABC1234567");

        data.put("CreatedDate","01-03-2018");

        return data;

    }

Mock JMS Connector

To prevent a JMS connector from trying to connect when running a Unit test, add the line below to the Jms Queue property in the app.properties file under /src/test/resources:

jmsQueue= vm://embeddedBroker?marshal=true&broker.persistent=false

Add Global Function to Mule.

1.) Create a new java standard class.

2.) Add a STATIC void or function that will return the result.

3.) Add the following config, update the package, class, function and parameter/s name to match those that have been created.

Global Function Config:

<configuration doc:name="Configuration">

        <expression-language>

            <import class="helper.Utility" />

            <global-functions>

                def myFunction(inputParam)

                {

                    return helper.Utility.myFunction(inputParam);

                }

           </global-functions>

         </expression-language>  

    </configuration>