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)

Akka Supervision

In this section, we will discuss one of the important concepts of Akka Toolkit—Supervision.

First, we will discuss the supervision role in Akka and move to its strategies. We will explore Akka Supervision strategies with some examples in the practical section.

What is supervision?

Supervision is a technique to organize the Akka Actors into a hierarchy, which means creating a parent-child relationship between Actors.

In Akka terminology, the parent Actor is known as supervisor and the child Actor as subordinate:

As shown in the preceding diagram, all Akka Actors are organized into a tree-like hierarchy. The supervisor Actor is responsible for supervising the subordinate Actors. These subordinate Actors...