Book Image

Scala Reactive Programming

By : Rambabu Posa
Book Image

Scala Reactive Programming

By: Rambabu Posa

Overview of this book

Reactive programming is a scalable, fast way to build applications, and one that helps us write code that is concise, clear, and readable. It can be used for many purposes such as GUIs, robotics, music, and others, and is central to many concurrent systems. This book will be your guide to getting started with Reactive programming in Scala. You will begin with the fundamental concepts of Reactive programming and gradually move on to working with asynchronous data streams. You will then start building an application using Akka Actors and extend it using the Play framework. You will also learn about reactive stream specifications, event sourcing techniques, and different methods to integrate Akka Streams into the Play Framework. This book will also take you one step forward by showing you the advantages of the Lagom framework while working with reactive microservices. You will also learn to scale applications using multi-node clusters and test, secure, and deploy your microservices to the cloud. By the end of the book, you will have gained the knowledge to build robust and distributed systems with Scala and Akka.
Table of Contents (16 chapters)

The Akka Streams API

In the Akka Streams API, there are mainly the following three main APIs. They are also known as Components of the Akka Streams API. We can also treat them as different processing stages in Akka Streams:

  • Source
  • Sink
  • Flow

The Akka Streams API has two sets of DSL APIs. One set for Java-defined at, and another for Scala-defined at

All the preceding three Akka Streams API components are defined in the package.

Apart from the preceding three major components, the Akka Streams API has one imported API, ActorMaterializer.

It also uses the Akka Actor module's ActorSystem. In this section, we will first discuss the three APIs—Source, Sink, and Flow, and will then discuss the rest of the APIs in the coming sections.