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 Scala Future API in Play Framework

As a Play Framework application developer, I think you have already come to know that the Scala Future API is very important to developing any Play Framework application.

We use the Scala Future API extensively in Play Framework applications to support asynchronous communication between components.

Let's take a Service class from a Play Framework web application. The following Service's getWeatherByCity() functions demonstrate how to return a value which is available in the future by using the Scala Future API:

class WeatherForecastingService extends CommonService { 
  override def getWeatherByCity(city:String):
Future[List[WeatherForecasting]] = Future{
// Here, prepare WeatherForecasting object
} }

Here we are using the Future object to prepare a list of WeatherForecasting objects. As this component takes more...