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)

Integrating Akka Streams into Play

In this section, we will develop a Reactive Multi-User Chat application using the following technology stack:

  • Play Framework
  • Play Web Socket API
  • Akka Streams API
  • Scala

Designing a Reactive Chat System

In this section, we will design and discuss our Reactive Multi-User Chat System, so that its easy for us to understand how our chat system works and how to develop our application in the next section.

We can assume our Reactive Chat System to be on a high level, as shown here:

In our Reactive Chat System, MergeHub acts a Source and BroadcastHub acts as a Sink:

Here multiple users connect to our system and send messages to others through the MergeHub component. So those message senders will...