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)

Basics of Akka Streams

In this chapter, we’ll take a closer look at Akka Streams. We will start with a basic description of streams in general, and Reactive Streams in particular. We'll touch on the concept of back pressure and provide some motivation for you to use Akka Streams as a concrete implementation of the Reactive Streams standard. We'll reimplement our bakery yet again, this time using streams as a design abstraction. This will allow us to examine in detail the basics of Akka Streams, such as flows and graphs, error handling, and testing.

The following topics will be covered in this chapter:

  • Reactive Streams
  • Back pressure
  • Akka Streams philosophy
  • Akka Streams essential concepts
  • Sources and sinks
  • Flows
  • Graphs
  • Logging
  • Materialization
  • Failure handling
  • Testing