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PHP Reactive Programming

You're reading from   PHP Reactive Programming Build fault tolerant and high performing application in PHP based on the reactive architecture

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Product type Paperback
Published in Mar 2017
Publisher Packt
ISBN-13 9781786462879
Length 364 pages
Edition 1st Edition
Languages
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Author (1):
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Martin Sikora Martin Sikora
Author Profile Icon Martin Sikora
Martin Sikora
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Table of Contents (12) Chapters Close

Preface 1. Introduction to Reactive Programming 2. Reactive Programming with RxPHP FREE CHAPTER 3. Writing a Reddit Reader with RxPHP 4. Reactive versus a Typical Event-Driven Approach 5. Testing RxPHP Code 6. PHP Streams API and Higher-Order Observables 7. Implementing Socket IPC and WebSocket Server/Client 8. Multicasting in RxPHP and PHP7 pthreads Extension 9. Multithreaded and Distributed Computing with pthreads and Gearman 10. Using Advanced Operators and Techniques in RxPHP Appendix. Reusing RxPHP Techniques in RxJS

Unsubscribing versus completing an Observable


We know that when we have an observer we'll stop receiving items when the source Observable completes or when we manually unsubscribe. However, we haven't talked about why we might choose one over the other.

There're basically two ways to stop receiving items:

  • Unsubscribe from the source Observable

  • Using an operator that completes the chain (such as the takeUntil() operator)

By unsubscribing we usually mean that we don't want to be receiving items any more. This obviously doesn't mean that the source Observable stopped sending items or sent the complete notification. We're just no longer interested in the items coming from the source.

As an important consequence to manually unsubscribing, the complete handler is never called. Consider the following example where we unsubscribe after receiving a few items:

// unsubscribe_01.php 
$loop = new StreamSelectLoop(); 
$scheduler = new EventLoopScheduler($loop); 
 
$subscription = Observable...
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