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
About the Author
About the Reviewers
Customer Feedback


Ideally, you will rarely get to a point where you need to build your own operator from scratch by implementing ObservableOperator or FlowableOperator. ObservableTransformer and FlowableTransformer will hopefully satisfy most cases where you can use existing operators to compose new ones, and this is usually the safest route. But on occasion, you may find yourself having to do something that the existing operators cannot do or not do easily. After you exhaust all other options, you may have to create an operator that manipulates each onNext(), onComplete(), and onError() event between the upstream and the downstream.

Before you go out and create your own operator, try to use existing operators first with compose() and a Transformer. After that fails, it is recommended that you post a question on StackOverflow and ask the RxJava community whether such an operator exists or can be composed easily. The RxJava community is very active on StackOverflow and they will likely provide a solution...