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)

Extending Play/Scala HelloWorld example with Akka Toolkit

In this section, we will use the same previous Play Framework/Scala based HelloWorld example and extend it with Akka Toolkit. I'll use the content from the previous example to demonstrate this.

Perform the following steps:

  1. Import the previously developed Play/Scala HelloWorld example into your favorite IDE.
  2. I just renamed this Project Name as play-scala-akka-helloworld-app.
  3. Define the configurations routes file:


      # Routes
# This file defines all application routes (Higher priority
routes first)
# ~~~~
# HelloWorldController without using Play DI
GET /helloWorldNoDI
# HelloWorldController with Play DI
GET /helloWorldDI controllers.HelloWorldDIController.helloWorld
# Map static resources from the /public...