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)

Actor basic operations

In this section, we will discuss some of the useful and frequently used Akka Actor operations. In the Akka Toolkit, an Actor can perform the following operations:

  • Create an Actor
  • Send messages
  • Receive messages
  • Stop an Actor
  • Become/unbecoming an Actor
  • Supervise an Actor

Let's define a simple Actor to explore all these operations, one by one, in the following sections.

Defining an Actor

Before creating an Actor and performing its operations, we need to define it.

In the Akka Toolkit, we can define an Actor class by extending the Actor Trait and providing implementation for the receive method, as follows:

class SampleActor extends Actor { 
  def receive: Receive = {