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)

Unit testing Lagom services

In this section, you will learn how to unit test Lagom Framework's microservices, using Akka Toolkit's Testing modules.

Lagom Framework provides the following two testing modules to unit test our Reactive microservices or Reactive web applications:

  • lagom-core-testkit
  • lagom-scaladsl-testkit

We will refer to the lagom-scala-hello-service project available under this chapter folder in the GitHub repository.

Perform the following steps to unit test the lagom-scala-hello-service components:

  1. Add the following SBT plugin to the /project/plugins.sbt file:
      addSbtPlugin("com.lightbend.lagom" % "lagom-sbt-plugin" % "1.4.0-M3")

The preceding Lagom's SBT plugin pulls not only the required Lagom libraries to develop a Reactive microservice, but also pulls the two previously mentioned Testing Module libraries...