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 Scala Future API

The Scala Future and Promise API is defined in the scala.concurrent package. This API is used to develop concurrent and parallel applications in the Scala language.

The Future represents a computation unit; this unit is executed by Promise and put into the Future.

In simple words, Future is an object to read that result and Promise is an object to execute that computation unit. Let's explore these concepts in depth, with some useful examples in the coming sections.

Building blocks of the Scala Future API

The Scala Future API has the following building blocks:

  • Scala Future
  • Scala Promise
  • Scala ExecutionContext

The following diagram shows the main building blocks of the Scala Future API:

These are...