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
About the Author
About the Reviewers
Customer Feedback

An HTTP example

Any learning is not complete until and unless we apply it to a real-time scenario. So far, you have learned many concepts of reactive programming. Now, it's time to apply them to a real-world scenario, where we will use an API to get some data through an HTTP request and print the response data to the console.

We used one additional plugin for this example—RxJava-Apache-HTTP. If you're using Gradle as your build tool, add the following dependency:

    //RxJava - Apache - HTTP 
    compile "" 

Here is the code:

    fun main(args: Array<String>) { 
      val httpClient = HttpAsyncClients.createDefault()//(1) 
        .flatMap{ response -> 
 { bytes -> 
       .onErrorReturn {//(5) 
          "Error Parsing data...