MCD-LEVEL-1 Practice Questions

Correct answer is The city is #[payload.City]

Answer can get confused with the option #["The city is" ++ payload.City] But note that this option

will not print the space between is and city name. This will print The city isPune

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Mule event is correct answer. Mule event has two parts which are as follows

1) Message (which contains payload and attributes like headers and query/uri parameters

2) Variables

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Flow Reference Component

Flow Reference routes the Mule event to another flow or subflow, executes all processors in the

referenced flow, and then routes the event back within the same Mule application. The following

diagram shows the order of processing when one flow

another:

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When the main flow is triggered, the Mule event travels through and executes the flow until the

event reaches the Flow Reference. The event then travels through and executes the referenced flow

from beginning to end, and then returns to the main flow.

This process enables you to treat the entire referenced flow like a single component in your current

flow.

Mule Ref Doc : https://docs.mulesoft.com/mule-runtime/4.3/flowref-about

Correct answer is

payload

quantity var

color query param

Note that private flow has error scope defined as On Error Continue . So when error occurs in private

flow , it is handled by this On Error Continue scope which sends success response back to main flow

and does not throw back an error. So main continues normally and payload is set to Success - main

flow.

Hence correct answer is Success - main flow

1) HTTP listener received request

2) The Flow Reference calls the child flow

3) The Is Number validator creates an Error Object because the payload isn’t an integer. Child Flow

execution stops

#[error.description] = “payload is not a valid INTEGER value”

#[error.errorType] = VALIDATION:INVALID_NUMBER

4) The On Error Continue handles the errorThe payload is set to “Error – Sub Flow”

5) “Error – Sub Flow” is returned to the main flow as if the child flow was a success. The Set Payload

is executed. The payload is reset to “Success – Finished Main Flow”

6) “Success – Main Flow” is returned to the requestor in the body of the HTTP request. HTTP Status

Code: 200

As you can see, in the above example, because the error was caught by an On Error Continue scope

in the child flow (RED in, GREEN out) when the Mule Message returns to the parent flow, the parent

flow knows none-the-different that there was a failure because the on error continue returns a 200

success message. Note that because, to the mainFlow, the childFlow appeared to succeed, the

processing of mainFlow resumed after the flow reference.

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Creates reusable APIs and assets designed to be consumed by other business units

Correct answer is An Object containing all three Mule event Objects

The Scatter-Gather component is a routing event processor that processes a Mule event through

different parallel processing routes that contain different event processors. Each route receives a

reference to the Mule event and executes a sequence of one or more event processors. Each of these

routes uses a separate thread to execute the event processors, and the resulting Mule event can be

either the same Mule event without modifications or a new Mule event with its own payload,

attributes, and variables. The Scatter-Gather component then combines the Mule events returned by

each processing route into a new Mule event that is passed to the next event processor only after

every route completes successfully.

The Scatter-Gather component executes each route in parallel, not sequentially. Parallel execution of

routes can greatly increase the efficiency of your Mule application and may provide more

information than sequential processing.

Sample output is as below

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MuleSoft Documentation reference : https://docs.mulesoft.com/mule-runtime/4.3/scatter-gatherconcept

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