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

Summary


In this chapter, you learned about Flowable and backpressure and which situations it should be preferred over an Observable. Flowables are especially preferable when concurrency enters your application and a lot of data can flow through it, as it regulates how much data comes from the source at a given time. Some Flowables, such as Flowable.interval() or those derived from an Observable, do not have backpressure implemented. In these situations, you can use onBackpressureXXX() operators to queue or drop emissions for the downstream. If you are creating your own Flowable source from scratch, prefer to use the existing Flowable factories, and if that fails, prefer Flowable.generate() instead of Flowable.create().

If you got to this point and understand most of the content in this book so far, congrats! You have all the core concepts of RxJava in your toolkit, and the rest of the book is all a walk in the park from here. The next chapter will cover how to create your own operators, which...