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 Promise

In this section, we will discuss the second component of the Scala Future API—Promise.

A Scala Promise is something similar to a Scala Future. Like a Scala Future, a Scala Promise may have a value or an exception. They have some minor differences in the actual functionality. Let's discuss them in the following sub-sections.

What is a Scala Promise?

Like a Scala Future, a Scala Promise is an object used to write AP. It is used to execute asynchronous code.

Like a Scala Future, a Scala Promise may have a value if it finishes successfully, or an exception or error if it finishes with some failure. We can say a Promise is completed if it finishes with a value or an exception. The following diagram...