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)


In this chapter, we discussed what Akka Streams are and why we need them, and also their features and benefits with some simple examples.

The Akka Streams API has two kinds of DSL for easy data streaming; Akka Streams DSL and Akka Streams GraphDSL. Both DSL have two sets of APIs—one for Java and one for Scala.

Akka Streams has three core and basic building blocks—Source, Flow, and Sink. We have discussed them thoroughly, with examples. It also has two GraphDSL building blocks, Fan-In and Fan-Out junctions, which support complex and non-linear Graphs.

In next chapter, we will develop our WF application completely using our Lightbend Reactive Stack-Play Framework, Akka, Scala, and Akka Streams.