Book Image

Learn Scala Programming

By : Slava Schmidt
Book Image

Learn Scala Programming

By: Slava Schmidt

Overview of this book

The second version of Scala has undergone multiple changes to support features and library implementations. Scala 2.13, with its main focus on modularizing the standard library and simplifying collections, brings with it a host of updates. Learn Scala Programming addresses both technical and architectural changes to the redesigned standard library and collections, along with covering in-depth type systems and first-level support for functions. You will discover how to leverage implicits as a primary mechanism for building type classes and look at different ways to test Scala code. You will also learn about abstract building blocks used in functional programming, giving you sufficient understanding to pick and use any existing functional programming library out there. In the concluding chapters, you will explore reactive programming by covering the Akka framework and reactive streams. By the end of this book, you will have built microservices and learned to implement them with the Scala and Lagom framework.
Table of Contents (19 chapters)

Akka Typed basics

Now that we've made the compiler happy and got our first impression about how typed actors tick, let's take a more principled approach and look in detail at how they can be created, discovered, and stopped, and what possibilities there are to change an actor's behavior.

Creating an actor

In accordance to the actor model definition, there is exactly one way that an actor can be created—it can be spawned by another actor. Akka gives you two slightly different possibilities to do this by using ActorContext. Both methods are not thread safe and should only be used directly within the actor's thread.

The first variant allows you to instantiate an anonymous actor from a behavior and returns...