Learning Akka (Video 42)

This video tutorial covers scheduling periodic messages in actor systems. It introduces two approaches: scheduling in the constructor and canceling in the pre-post method, and scheduling in the pre-start method with handling for restarts. The video also reviews common patterns in actor systems and summarizes the course topics, including actor structure, behavior, and various modules.

What is the initial delay before the first message is sent in the first scheduling approach?

• 2 seconds

• 1 second

• 500 milliseconds

• 100 milliseconds

In the first approach, how often are messages sent after the initial delay?

• Every 500 milliseconds

• Every 2 seconds

• Every second

• Every 5 seconds

What is a potential issue with the second scheduling approach during actor restarts?

• Mailbox may fill up with tick messages

• Messages are sent in reverse order

• Messages are sent too frequently

• Messages are not sent at all

How does the second approach prevent mailbox overflow?

• By scheduling all messages at once

• By reducing the number of messages

• By only scheduling a new message after the previous one is processed

• By increasing the message interval

Which of the following is NOT a common pattern discussed in the final section?

• Balancing workload across nodes

• Message throttling

• Actor persistence

• Shutdown patterns