06_Events

Question 1

What is the structure of the Mule 4 event?

Answer 1

Mule Message - data that passes through the flows in the app, contains Attributes and Payload. Mule Variables - metadata that is defined and reference in the app processing the event

Question 2

Where is each of the data from the HTTP request populated in a Mule 4 Event?
HTTP request: Headers, Data.

Answer 2

Headers -> Attributes
Data -> Payload
(both in the MuleSoft Message)

Question 3

What is DataSense?

Answer 3

The ability to proactively discover metadata from internal and external resources.

Question 4

At design time in Anypoint Studio, what uses datasense?

Answer 4

Transform message component, DataSense explorer, when writing expressions using auto-completion.

Question 5

In Anypoint Studio where are the loffed values displayed?

Answer 5

Console View.

Question 6

In apps that are deploted to CloudHub or customer-hosted runtimes where are the logged values displayed?

Answer 6

Log Files.

Question 7

What component creates logged values?

Answer 7

Logger component.

Question 8

What can you add tto processors to step through the application when debugging?

Answer 8

Adding breakpoints.

Question 9

What port does the debugger listen for incoming TCP connections? Where can you change this?

Answer 9

localhost port 6666

in a project’s run configuration

Question 10

What are the 2 different types of DataWeave expressions?

Answer 10

Standalong scripts (Transform Megssage) and Inline expresssions (use #[] 
 - used to dynamically set the value of properties in an event processor or global configuration element) .

Question 11

What syntax is used to reference the Mule event payload?

Answer 11

[message.payload]

Question 12

What syntax is used to reference the query parameter ‘frenchFries’?

Answer 12

[message.attributes.queryParams.frenchFries]

Question 13

What syntax is used to reference the variable ‘hairyBikers’?

Answer 13

[vars.hairyBikers]

Question 14

What are the 2 different syntaxs for referencing the ‘id’ which is in the Mule Event payload?

Answer 14

#[message.payload.id] OR 
#[message.payload['id']]

(you don’t always need the message.payload you can have it withou the message so you just have e.g. payload.id)

Question 15

Syntax for a key:value pair (single value selector)?

Answer 15

[payload.key]

Question 16

How to reference a value of a selected array index?

Answer 16

[payload.value[index# e.g. 1]

Question 17

How to reference multi value selector of key:value pairs?

Answer 17

#[payload.*key] 
(will return all the key:value pairs of that specific key.

Question 18

What are each of the operators used in DW and examples?

Answer 18

Arithmetic (+,-,/,*), 
Equality ( ==, != ), 
Relational (>, >=. is),
Conditional (and, or, not), 
Type (as),
Default value (default)

Question 19

How are functions packaged in DataWeave?

Answer 19

Modules.

Question 20

A function that has 2 parameters can have alternative syntax, what are they?

Answer 20

#[contains(payload,max)]. 
#[payload contains "max"]

Question 21

What component do you need to set a variable in the Mule Event?

Answer 21

Set Variable.

Question 22

What view do you use when setting response data and request data for a HTTP Listener?

Answer 22

properties view