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)


In this chapter, we started with learning about the Akka Streams API, which has mainly two kinds of components:

  • Static Stream components
  • Dynamic Stream components

Akka Dynamic Streams have mainly the following components to support the dynamic nature of Graphs:

  • MergeHub
  • BroadcastHub
  • PartitionHub

Then we developed a Reactive Play Multi-User Chatting Web application using Play Framework, Akka Dynamic Streams components, Play Web Socket, and Scala technology stack.

In Chapter 7, Working with Reactive Streams, we discussed how to develop CQRS/ES Persistence applications using the Akka Persistence API. In this chapter, we developed and explored a couple of Akka Persistence Query APIs.

We need to understand these Persistence and Persistence Query APIs very well because we are going to develop a Lagom Framework-based WF Reactive System in the next chapter using a similar...