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)


Let's recap what we've learned in this chapter.

Current scaling demands are hard to meet using traditional approaches. The actor model with its shared nothing paradigm offers a solution to this problem. Akka is a library for building actor-based applications on the JVM.

Actors communicate by sending and receiving messages and change their internal state and produce side-effects in response. Each actor has an address in the form of an ActorRef, which also encapsulates ab actor's mailbox and a dispatcher. Actors are organized into hierarchies where parent actors are responsible for the supervision of their children.

Actors have a well-defined life cycle and implement a number of methods, which are called at appropriate moments during their lifetimes.

Akka provides additional modules that extend provided functionality even further.

We also looked at Akka...