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)

RxScala Marble diagrams

This section is a continuation of the Marble diagrams section of Chapter 1, Getting Started with Reactive and Functional Programming. Refer to that section to understand what a Marble diagram is and its rules and benefits.

In this section, we will discuss the following things:

  • How to represent Marble diagrams for RxScala components
  • How to represent Marble diagrams for RxScala basic operations

The following diagram shows what our RxScala application's input Observable looks like:

An input Observable (that is, a data stream) is represented, as shown in the following diagram; when the Observable ( the input data stream) emits the data elements, its associated Observer's onNext() function is executed to take data elements one by one to apply the data transformation:

An Observer that is completed successfully is represented as follows. In the...