Learning Akka (Video 12)

This video tutorial explores how to change actor behavior at runtime using the 'become' and 'unbecome' methods in Akka. It introduces the concept of stash messages to manage message handling when an actor's current behavior cannot process them. The tutorial implements a user storage actor to demonstrate database operations, including connecting, disconnecting, and performing CRUD operations. It explains how to manage actor states and transitions between connected and disconnected states using the 'context.become' function. The video also addresses handling messages in different states and fixing issues using the stash trait.

What is the primary purpose of the user storage actor introduced in the video?

• To manage user interface components

• To perform network operations

• To handle database operations for the user model

• To manage file storage

Which function is used to change the actor's state in Akka?

• context.transform

• context.change

• context.become

• context.switch

What happens if a 'create' message is sent before a 'connect' message in the user storage actor?

• The actor handles it in the disconnected state

• The message is ignored

• The actor crashes

• The message is processed immediately

How does the 'stash' trait help in managing actor messages?

• It forwards messages to another actor

• It deletes unprocessable messages

• It logs messages for future reference

• It temporarily stores messages that cannot be processed

What must be done before invoking the 'become' function when using the 'stash' trait?

• Invoke the 'reset' function

• Invoke the 'unstashAll' function

• Invoke the 'clear' function

• Invoke the 'flush' function