Learning Akka (Video 17)

Learning Akka (Video 17)

Assessment

Interactive Video

Information Technology (IT), Architecture

University

Practice Problem

Hard

Created by

Wayground Content

FREE Resource

This video tutorial covers the implementation of a persistent FSM actor for managing account states. It begins with an introduction to FSM and the account actor, followed by defining states and data. The tutorial then explains domain events and commands, and proceeds to implement the persistent FSM actor by overriding necessary methods. Finally, it defines state handlers and tests the actor, demonstrating its functionality and event replay from the journal.

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7 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What are the two states of the account actor?

Empty and Active

Inactive and Active

Empty and Full

Zero and Non-zero

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the purpose of defining domain events in the FSM actor?

To define actor commands

To handle state transitions

To represent transaction types and outcomes

To manage user accounts

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which method is responsible for applying events in the persistent FSM actor?

updateState

applyEvent

handleEvent

processEvent

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the role of the persistence ID in the FSM actor?

To manage state transitions

To store transaction data

To identify the actor's state

To uniquely identify the persistent actor

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What happens when a debit operation results in a balance less than zero in the active state?

The state remains active

The state changes to empty

The transaction is accepted

The transaction is rejected

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the initial state and data of the FSM actor?

Active state with positive balance

Empty state with positive balance

Empty state with zero balance

Active state with zero balance

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the outcome when a credit operation is received in the empty state?

The state changes to active

The balance is reset

The state remains empty

The transaction is rejected

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