In this session, we will discuss about actor system, hierarchy, introduction to child actors -how to instantiate child actors, and naming conventions to be followed. Also, we will discuss about supervision strategies and actor selection in Akka.

1. Presented By:
Purva Agrawal
Software Consultant
Working With Child
Actors in Akka

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3. Agenda
01 Introduction to Akka Actors
02 Actor Hierarchy
04 Supervision and Actor Selection
Child Actors
03
Demo
05

4. Introduction to Akka Actors

5. ● Akka is a toolkit and runtime for building highly concurrent, distributed,
and fault-tolerant message-driven applications on the JVM.
● Akka is written in Scala.
● What is an Actor?
● Message Passing

6. Actor Hierarchy and
Actor System

8. ● The ActorSystem is a root actor in actor structure.
● It is a hierarchical group of actors which share common configuration, e.g.
dispatchers, deployments, remote capabilities and addresses.
● It is also the entry point for creating or looking up actors.
Actor Path

9. Creating Parent Actor
Creating Child Actor

10. Supervision

11. ❏ In case of failure,the parent decides from the below directives :
● Resume: Simply resume message processing.
● Restart: Transparently replace affected actor with new instance and then resume message
processing.
● Stop: Stop affected Actor permanently.
● Escalate: Escalate the failure by failing itself and propagate failure to its parent.
❏ Supervision Strategy
There are two type of supervision strategies to supervise any actor:
1. One-For-One – Only the faulty child is affected when it fails.
2. One-For-All – All children are affected when one child fails.

12. Actor Selection

13. ● Actor selection is a feature that offers to find actor by path.
● The actor path is used to send the message to that particular actor.
● It is used to locate an actor deeper into the hierarchy.
How to use Actor Selection

14. DEMO

15. Thank You !