Learning Akka (Video 8)

This video tutorial explores the methods of sending messages to actors using 'tell' and 'ask'. It demonstrates a use case in a registration system where actors are implemented to handle user registration, checking for blacklisted users, and storing user data. The video guides through defining messages and actors, coding the actor system, and running the application. It concludes with a preview of the next video on supervision and monitoring.

What is the primary characteristic of the 'tell' method when sending messages to an actor?

• It sends a message asynchronously and does not wait for a response.

• It requires a callback function.

• It sends a message synchronously.

• It waits for a response before proceeding.

In the registration system use case, what is the role of the Checker actor?

• To add users to the system.

• To check if a user is blacklisted.

• To send notifications to users.

• To store user data.

Which actor is responsible for adding users to the system once they are verified?

• Checker

• Storage

• Recorder

• Notifier

What message does the Checker actor send if a user is not blacklisted?

• Add user

• White user

• New user

• Black user

How does the Recorder actor handle a 'white user' message?

• It sends a 'black user' message to the Checker.

• It sends an 'add user' message to the Storage.

• It ignores the message.

• It sends a 'new user' message to the Checker.