Learning RxJava

Key Features

• Explore the essential tools and operators RxJava provides, and know which situations to use them in
• Delve into Observables and Subscribers, the core components of RxJava used for building scalable and performant reactive applications
• Delve into the practical implementation of tools to effectively take on complex tasks such as concurrency and backpressure

Book Description

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.

What you will learn

• Learn the features of RxJava 2 that bring about many significant changes, including new reactive types such as Flowable, Single, Maybe, and Completable
• Understand how reactive programming works and the mindset to "think reactively"
• Demystify the Observable and how it quickly expresses data and events as sequences
• Learn the various Rx operators that transform, filter, and combine data and event sequences
• Leverage multicasting to push data to multiple destinations, and cache and replay them
• Discover how concurrency and parallelization work in RxJava, and how it makes these traditionally complex tasks trivial to implement
• Apply RxJava and Retrolambda to the Android domain to create responsive Android apps with better user experiences
• Use RxJava with the Kotlin language to express RxJava more idiomatically with extension functions, data classes, and other Kotlin features

About the Author

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 as well as 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 or intimidated by it.

Currently, Thomas is interested in data science, reactive programming, and the Kotlin language. You may find him speaking on these three subjects and how they can interconnect.

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

Table of Contents

1. Thinking Reactively
2. Observables and Subscribers
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 with Kotlin New
13. Appendix