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)

What is Akka's Let It Crash model?

The Akka Toolkit follows the Let it Crash model to take care of fault handling. When a subordinate Actor crashes, let it crash and do that fault handling with the help of another Actor. This means the subordinate does not need to worry how to handle that situation. The supervisor of that Actor will take care of that fault handling based on the configured supervision strategy.

This Akka's approach clearly defines who is responsible for taking care of fault handling (supervisor Actors) and who is responsible for actual business logic (Subordinate Actors). This loose coupling and the SRP (Single Responsibility Principle) approach gives us the ease of fault handling and lightweight Actors. Refer to the Supervisor strategies section for more information on this.

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