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 how to test and debug RxJava code. When you create an application or an API that is built on RxJava, you may want to build unit tests around it in order to ensure that sanity checks are always enforced. You can use blocking operators to help perform assertions, but TestObserver and TestSubscriber will give you a much more comprehensive and streamlined testing experience. You can also use TestScheduler to simulate time elapses so that time-based Observables can be tested instantly. Finally, we covered a debugging strategy in RxJava, which often involves finding the broken operator, starting at the source, and moving downstream until it is found.

This chapter closes our journey covering the RxJava library, so congratulations if you got here! You now have a solid foundation of building reactive Java applications. In the final two chapters, we will cover RxJava in two specific domains: Android and Kotlin.