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)

Scala Type class

In Scala, a Type class defines some behavior in terms of some operations. If a new class (or Type) wants to join as a member of that Type class, it must provide implementation to all operations, which are defined in that Type class.

So in simple words, a Type class is a group of classes which provides implementation to a contract (or an interface).

The main goal of Type classes is to define a contract or interface to its types.

Unlike sub-type polymorphism, which uses OOP inheritance, Type classes follow ad hoc polymorphism, using composition and support DRY (Do NOT Repeat Yourself) and SRP (Single Responsibility Principle).

Like generics or Type parameters, Type classes are resolved at compile time. The following diagram shows the main goal of Scala Type class:

Types of polymorphism in brief:

  • Parametric polymorphism—using generics:
      trait Json...