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Learning Scala Programming

You're reading from  Learning Scala Programming

Product type Book
Published in Jan 2018
Publisher Packt
ISBN-13 9781788392822
Pages 426 pages
Edition 1st Edition
Languages
Author (1):
Vikash Sharma Vikash Sharma
Profile icon Vikash Sharma

Table of Contents (21) Chapters

Title Page
Packt Upsell
Contributors
Preface
1. Getting Started with Scala Programming 2. Building Blocks of Scala 3. Shaping our Scala Program 4. Giving Meaning to Programs with Functions 5. Getting Familiar with Scala Collections 6. Object-Oriented Scala Basics 7. Next Steps in Object-Oriented Scala 8. More on Functions 9. Using Powerful Functional Constructs 10. Advanced Functional Programming 11. Working with Implicits and Exceptions 12. Introduction to Akka 13. Concurrent Programming in Scala 14. Programming with Reactive Extensions 15. Testing in Scala 1. Other Books You May Enjoy Index

Understanding the Actor system


Akka documentation simply explains an ActorSystem as a heavyweight structure that will allocate 1 to N threads, and we should create one per logical application. Once we create an actor system, we get the license to create actors under that system. We'll take a look at how we can create Actors in the next sections.

When we create actors as part of a system, these actors share the same configuration (such as dispatchers, paths, and addresses) as the Actor system.

Within an Actor system, there's a root guardian Actor; this serves as a parent actor to all actors residing within an actor system, internal actors, as well actors that we create. So, as expected, this is the last actor to be stopped when the system terminates.

The reason why Akka provides these guardian actors is to supervise the first-level actors we create, so for user created actors too, we have a specific user guardian. Similarly, for system provided actors, Akka has system guardian.

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