Learning Reactive Programming with Java 8

Nickolay Tsvetinov

• Publisher: Packt Publishing
• Year: 2015
• ISBN:
  9781785288722
• Edition: 1
• Topic: Informatik
• Subtopic: Anwendungsentwicklung

Learning Reactive Programming with Java 8

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Table of Contents

Learning Reactive Programming with Java 8

Credits

About the Author

About the Reviewers

www.PacktPub.com

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Why subscribe?

Free access for Packt account holders

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Downloading the example code

Errata

Piracy

Questions

1. An Introduction to Reactive Programming

What is reactive programming?

Why should we be reactive?

Introducing RxJava

Downloading and setting up RxJava

Comparing the iterator pattern and the RxJava Observable

Implementing the reactive sum

Summary

2. Using the Functional Constructions of Java 8

Lambdas in Java 8

Introducing the new syntax and semantics

Functional interfaces in Java 8 and RxJava

Implementing the reactive sum example with lambdas

Pure functions and higher order functions

Pure functions

Higher order functions

RxJava and functional programming

Summary

3. Creating and Connecting Observables, Observers, and Subjects

The Observable.from method

The Observable.just method

Other Observable factory methods

The Observable.create method

Subscribing and unsubscribing

Hot and cold Observable instances

The ConnectableObservable class

The Subject instances

Summary

4. Transforming, Filtering, and Accumulating Your Data

Observable transformations

Transformations with the various flatMap operators

Grouping items

Additional useful transformation operators

Filtering data

Accumulating data

Summary

5. Combinators, Conditionals, and Error Handling

Combining the Observable instances

The zip operator

The combineLatest operator

The merge operator

The concat operator

The conditional operators

The amb operator

The takeUntil(), takeWhile(), skipUntil(), and skipWhile() conditional operators

The defaultIfEmpty( ) operator

Handling errors

The return and resume operators

The retrying technique

An HTTP client example

Summary

6. Using Concurrency and Parallelism with Schedulers

RxJava's schedulers

Debugging Observables and their schedulers

The interval Observable and its default scheduler

Types of schedulers

The Schedulers.immediate scheduler

The Schedulers.trampoline scheduler

The Schedulers.newThread scheduler

The Schedulers.computation scheduler

The Schedulers.io scheduler

The Schedulers.from(Executor) method

Combining Observables and schedulers

The Observable<T> subscribeOn(Scheduler) method

The Observable<T> observeOn(Scheduler) operator

Parallelism

Buffering, throttling, and debouncing

Throttling

Debouncing

The buffer and window operators

The backpressure operators

Summary

7. Testing Your RxJava Application

Testing using simple subscription

The BlockingObservable class

The aggregate operators and the BlockingObservable class

Testing with the aggregate operators and the BlockingObservable class

Using the TestSubscriber class for in-depth testing

Testing asynchronous Observable instances with the help of the TestScheduler class

Summary

8. Resource Management and Extending RxJava

Resource management

Introducing the Observable.using method

Caching data with Observable.cache

Creating custom operators with lift

Composing multiple operators with the Observable.compose operator

Summary

Index

Learning Reactive Programming with Java 8

Copyright © 2015 Packt Publishing

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First published: June 2015

Production reference: 1170615

Published by Packt Publishing Ltd.

Livery Place

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Birmingham B3 2PB, UK.

ISBN 978-1-78528-872-2

www.packtpub.com

Credits

Author

Nickolay Tsvetinov

Reviewers

Samuel Gruetter

Dávid Karnok

Timo Tuominen

Shixiong Zhu

Commissioning Editor

Veena Pagare

Acquisition Editor

Larrisa Pinto

Content Development Editor

Adrian Raposo

Technical Editor

Abhishek R. Kotian

Copy Editors

Brandt D'mello

Neha Vyas

Project Coordinator

Sanchita Mandal

Proofreader

Safis Editing

Indexer

Mariammal Chettiyar

Production Coordinator

Conidon Miranda

Cover Work

Conidon Miranda

About the Author

Nickolay Tsvetinov is a professional all-round web developer at TransportAPI—Britain's first comprehensive open platform for transport solutions. During his career as a software developer, he experienced both good and bad and played with most of the popular programming languages—from C and Java to Ruby and JavaScript. For the last 3-4 years, he's been creating and maintaining single-page applications (SPA) and the backend API architectures that serve them. He is a fan of open source software, Rails, Vim, Sinatra, Ember.js, Node.js, and Nintendo. He was an unsuccessful musician and poet, but he is a successful husband and father. His area of interest and expertise includes the declarative/functional and reactive programming that resulted in the creation of ProAct.js (http://proactjs.com), which is a library that augments the JavaScript language and turns it into a reactive language.

First of all, I want to thank my wife, Tanya. I wrote this book because she told me that I was capable of doing this. She was with me all these months; I worked late at night ...