Book Image

Learning RxJava - Second Edition

By : Nick Samoylov, Thomas Nield
Book Image

Learning RxJava - Second Edition

By: Nick Samoylov, Thomas Nield

Overview of this book

RxJava is not just a popular library for building asynchronous and event-based applications; it also enables you to create a cleaner and more readable code base. In this book, you’ll cover the core fundamentals of reactive programming and learn how to design and implement reactive libraries and applications. Learning RxJava will help you understand how reactive programming works and guide you in writing your first example in reactive code. You’ll get to grips with the workings of Observable and Subscriber, and see how they are used in different contexts using real-world use cases. The book will also take you through multicasting and caching to help prevent redundant work with multiple Observers. You’ll then learn how to create your own RxJava operators by reusing reactive logic. As you advance, you’ll explore effective tools and libraries to test and debug RxJava code. Finally, you’ll delve into RxAndroid extensions and use Kotlin features to streamline your Android apps. By the end of this book, you'll become proficient in writing reactive code in Java and Kotlin to build concurrent applications, including Android applications.
Table of Contents (22 chapters)
1
Section 1: Foundations of Reactive Programming in Java
5
Section 2: Reactive Operators
12
Section 3: Integration of RxJava applications
Appendix B: Functional Types
Appendix E: Understanding Schedulers

Observable and Observer

We already got a glimpse into Observable and how it works in Chapter 1, Thinking Reactively. You probably have many questions on how exactly it operates and what practical implications it brings to code.

This chapter will provide a foundation for the understanding of Observable, as well as the critical relationship it has with Observer. We will also cover several ways to create an Observable and how to use its operators. To make the rest of the book flow smoothly, we will also cover all critical nuances head-on to build a solid foundation, so that you do not have surprises later.

Here is what we will cover in this chapter:

  • The Observable class
  • The Observer interface
  • Observable factories
  • Single, Completable, and Maybe
  • Disposable