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)

Architecture of Play Framework

In this section, we will discuss the typical architecture of a Play Framework web application. Here, some components are mandatory for all applications, such as the routes file, Controller, View Templates, and so on; some are optional:

We can observe the following steps in any Play Framework Web Application:

  1. The users access a Play Web Application, using the application URL and a web browser.
  2. When the user sends a HTTP request to a Play Web Application, such as /route2 in our example, first that request reaches the Play Framework's Routing component (the default route filename is routes). However, we can use any name. Some applications may have more than one route file; finally, they have one top-level routes file.
  1. Play Framework Web Application's Route component decides who is responsible to handle that Request. It will find the correct...