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 Sharding Pattern

Sharding means dividing a whole component into small and manageable parts and distributing them into different nodes of a cluster, so that that the whole component can be accessed at all times. It gives better performance and never fails. Let us assume, we design and develop our Reactive System by following this design pattern. Even if one of our system's portion or part fails, it will recover that functionality by using another portion from same node or a different node in that same cluster or different cluster.

Here, those small parts are known as Shards.

This principle is the same even in the Reactive World. In a Reactive System, we divide a big Domain Object into small partitions and distribute them into different nodes in the cluster so that we can access our Domain Object data without fail:

As shown in the preceding diagram, our Reactive System...