Learning RxJava

Updated with the latest Maven coordinates, Java programming features, and API changes, this book is your guide to solving problems in writing asynchronous and event-based programs

Key Features

• Explore a variety of tools and techniques used to solve problems in implementing concurrency and parallelization
• Learn about core operators in RxJava that enable you to express your code logic productively
• Apply RxJava with Kotlin to create responsive Android apps with better user experience

Book Description

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.

What you will learn

• Discover different ways to create Observables, Observers, and Subscribers
• Multicast in order to push data to multiple destinations and cache and replay them
• Express RxJava idiomatically with the help of Kotlin features such as extension functions and data classes
• Become familiar with various operators available in RxJava to perform common transformations and tasks
• Explore RxJava's reactive types, including Flowable, Single, Maybe, and Completable
• Demystify Observables and how they express data and events as sequences

Who this book is for

This book is for Java developers who want to leverage reactive programming to develop more resilient and concurrent applications. If you're an RxJava user looking to get to grips with the latest features and updates in RxJava 3, this book is for you. Fundamental knowledge of core Java features and object-oriented programming will assist you in understanding the key concepts covered in this book.

Table of Contents

1. Thinking Reactively
2. Observable and Observer
3. Basic Operators
4. Combining Observables
5. Multicasting, Replaying, and Caching
6. Concurrency and Parallelization
7. Switching, Throttling, Windowing, and Buffering
8. Flowables and Backpressure
9. Transformers and Custom Operators
10. Testing and Debugging
11. RxJava on Android
12. Using RxJava for Kotlin
13. Appendix A: Introducing Lambda Expressions
14. Appendix B: Functional Types
15. Appendix C: Mixing Object-Oriented and Reactive Programming
16. Appendix D: Materializing and Dematerializing
17. Appendix E: Understanding Schedulers

Nick Samoylov graduated from the Moscow Institute of Physics and Technology, has worked as a theoretical physicist, and learned to program as a tool for testing his mathematical models. Following the demise of the USSR, Nick created and successfully ran his own software company. In 1999, with his wife Luda and two daughters, he emigrated to the USA and has been living in Colorado ever since, working as a Java programmer. In his spare time, Nick likes to write and hike in the Rocky Mountains.

Thomas Nield is a business consultant for Southwest Airlines in Schedule Initiatives, and a maintainer for RxJavaFX and RxKotlin. Early in his career, he became fascinated with technology and its role in business analytics. After becoming proficient in Java, Kotlin, Python, SQL, and reactive programming, he became an open source contributor and an author/speaker at O'Reilly Media. He is passionate about sharing what he learns and enabling others with new skill sets. He enjoys making technical content relatable and relevant to those unfamiliar with it or who are intimidated by it. He is interested in data science, reactive programming, and the Kotlin language.

He has also authored the book Getting Started with SQL, by O'Reilly Media.