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)

Developing Lagom WF Reactive System

In this section, we will start developing our WF Reactive System using Lagom Framework. Unlike our previous simple Hello Reactive System, we will develop some UI (User Interface or frontend) service for our WF system.

WF Reactive System architecture

Before developing our Reactive System, first we will understand its architecture. Our WF Reactive System has the following three main microservices:

  • WF Frontend (UI)
  • WF Producer (API and Implementation)
  • WF Consumer (API and Implementation)

As shown in the preceding diagram, the User interacts with our System through the WF Frontend Service. When the User generates any events in our system, they will be sent to the Cassandra data store wf-producer...