Module 4: Creating actor hierarchy and error handling.

Concepts you’ll learn.

In this module, we will learn how to create a hierarchy of actors and how to restore actors after a failure. To demonstrate the features of the Proto.Actor platform, we will create our streaming system for watching movies based on the actor hierarchy. You’ll see how Proto.Actor takes on all the low-level work of supporting the actor hierarchy and recovering actors after a crash.

You will also learn what a supervisor is and what actor-recovery strategies the Proto.Actor platform offers. At the end of this chapter, you will learn how to create your own actor recovery strategies, depending on the type of exception.

Table of Contents

1. Supervisor and actor hierarchy.
2. Overview of the application that demonstrates the supervisor’s capabilities and the actors hierarchy.
3. Actor’s addres and PID.
4. Creating UserCoordinatorActor.
5. Creating MoviePlayCounterActor.
6. How parent actors are watching over their children actors.
7. Strategies to control the state of children’s actors.