Search icon CANCEL
Subscription
0
Cart icon
Your Cart (0 item)
Close icon
You have no products in your basket yet
Save more on your purchases! discount-offer-chevron-icon
Savings automatically calculated. No voucher code required.
Arrow left icon
All Products
Best Sellers
New Releases
Books
Videos
Audiobooks
Learning Hub
Newsletter Hub
Free Learning
Arrow right icon
timer SALE ENDS IN
0 Days
:
00 Hours
:
00 Minutes
:
00 Seconds
Arrow up icon
GO TO TOP
Learning Reactive Programming With Java 8

You're reading from   Learning Reactive Programming With Java 8 Learn how to use RxJava and its reactive Observables to build fast, concurrent, and powerful applications through detailed examples

Arrow left icon
Product type Paperback
Published in Jun 2015
Publisher Packt
ISBN-13 9781785288722
Length 182 pages
Edition 1st Edition
Languages
Arrow right icon
Author (1):
Arrow left icon
Nickolay Tzvetinov Nickolay Tzvetinov
Author Profile Icon Nickolay Tzvetinov
Nickolay Tzvetinov
Arrow right icon
View More author details
Toc

Table of Contents (15) Chapters Close

Learning Reactive Programming with Java 8
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
1. An Introduction to Reactive Programming FREE CHAPTER 2. Using the Functional Constructions of Java 8 3. Creating and Connecting Observables, Observers, and Subjects 4. Transforming, Filtering, and Accumulating Your Data 5. Combinators, Conditionals, and Error Handling 6. Using Concurrency and Parallelism with Schedulers 7. Testing Your RxJava Application 8. Resource Management and Extending RxJava Index

Hot and cold Observable instances


Looking at the previous examples implemented using the Observable.create(), Observable.just(), and Observable.from() methods, we can say that until someone subscribes to them, they are inactive and don't emit anything. However, each time someone subscribes, they start emitting their notifications. For example, if we subscribe three times to an Observable.from(Iterable) object, the Iterable instance will be iterated three times. The Observable instances behaving like that are called cold Observable instances.

All of the factory methods we've been using in this chapter return cold Observables. Cold Observables produce notifications on demand, and for every Subscriber, they produce independent notifications.

There are Observable instances which, when they start emitting notifications, it doesn't matter if there are subscriptions to them or not. They continue emitting them until completion. All the subscribers receive the same notifications, and by default, when...

lock icon The rest of the chapter is locked
Register for a free Packt account to unlock a world of extra content!
A free Packt account unlocks extra newsletters, articles, discounted offers, and much more. Start advancing your knowledge today.
Unlock this book and the full library FREE for 7 days
Get unlimited access to 7000+ expert-authored eBooks and videos courses covering every tech area you can think of
Renews at £13.99/month. Cancel anytime
Visually different images