Book Image

Learning RxJava

By : Thomas Nield
Book Image

Learning RxJava

By: Thomas Nield

Overview of this book

RxJava is a library for composing asynchronous and event-based programs using Observable sequences for the JVM, allowing developers to build robust applications in less time. Learning RxJava addresses all the fundamentals of reactive programming to help readers write reactive code, as well as teach them an effective approach to designing and implementing reactive libraries and applications. Starting with a brief introduction to reactive programming concepts, there is an overview of Observables and Observers, the core components of RxJava, and how to combine different streams of data and events together. You will also learn simpler ways to achieve concurrency and remain highly performant, with no need for synchronization. Later on, we will leverage backpressure and other strategies to cope with rapidly-producing sources to prevent bottlenecks in your application. After covering custom operators, testing, and debugging, the book dives into hands-on examples using RxJava on Android as well as Kotlin.
Table of Contents (21 chapters)
Title Page
Credits
About the Author
Acknowledgements
About the Reviewers
www.PacktPub.com
Customer Feedback
Preface

Mixing object-oriented and reactive programming


As you start applying your RxJava knowledge to real-world problems, something that may not immediately be clear is how to mix it with object-oriented programming. Leveraging multiple paradigms such as object-oriented and functional programming is becoming increasingly common. Reactive programming and object-oriented programming, especially in a Java environment, can definitely work together for the greater good.

Obviously, you can emit any type T from an Observable or any of the other reactive types. Emitting objects built off your own classes is one way object-oriented and reactive programming work together. We have seen a number of examples in this book. For instance, Java 8's LocalDate is a complex object-oriented type, but you can push it through an Observable<LocalDate>, as shown in the following code:

import io.reactivex.Observable;
import java.time.LocalDate;

public class Launcher {

    public static void main(String[] args) {...