Book Image

Reactive Programming in Kotlin

By : Rivu Chakraborty
Book Image

Reactive Programming in Kotlin

By: Rivu Chakraborty

Overview of this book

In today's app-driven era, when programs are asynchronous, and responsiveness is so vital, reactive programming can help you write code that's more reliable, easier to scale, and better-performing. Reactive programming is revolutionary. With this practical book, Kotlin developers will first learn how to view problems in the reactive way, and then build programs that leverage the best features of this exciting new programming paradigm. You will begin with the general concepts of Reactive programming and then gradually move on to working with asynchronous data streams. You will dive into advanced techniques such as manipulating time in data-flow, customizing operators and provider and how to use the concurrency model to control asynchronicity of code and process event handlers effectively. You will then be introduced to functional reactive programming and will learn to apply FRP in practical use cases in Kotlin. This book will also take you one step forward by introducing you to Spring 5 and Spring Boot 2 using Kotlin. By the end of the book, you will be able to build real-world applications with reactive user interfaces as well as you'll learn to implement reactive programming paradigms in Android.
Table of Contents (20 chapters)
Title Page
Credits
About the Author
About the Reviewers
www.PacktPub.com
Customer Feedback
Dedication
Preface

Creating a Rest API with Spring Boot


We've seen the power of Spring and Spring Boot. So, let's use it without any further delay. We will build a RESTful web service that will return a Todo object. We will further enhance this project in the next chapter, where we will add Todo and fetch a list of Todo from the database. We will use JPA and Hibernate along with Spring for that purpose.

When we are done with this example, we should get the following response:

Cropped screenshot of browser output

So, let's start by creating a new project. You can use http://start.spring.io/ or you can use IntelliJ IDEA as well to create a new project.

After you have created the new project, you will see that there's an Application class; don't give much focus to it, it's there in almost all Spring Boot applications. We need to create a new class for Todo, as follows:

    data class Todo ( 
        var id:Int = 0, 
        var todoDescription:String, 
        var todoTargetDate:String, 
        var status:String...