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)

Model and Forms

In Play Framework, we use Scala sealed classes, case classes, and case objects to define model objects. Scala case classes are immutable and serializable.

Consider the following code, for example:

sealed class Message 
case object SuccessMessage extends Message  
case object FailureMessage extends Message 

We also define some Forms using the Play Form API. Refer to the Play Framework Form-based web application section of this chapter for more information.

Other components – services and repositories

We use some other user-defined components, such as services, repositories, and Utils, to decouple the code from controllers.

We define our business logic in Services and Data Access logic (such as DAO components...