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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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Toc

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

Implementing ProcessObservable


The application in this chapter is going to spawn subprocesses a lot so it makes sense to wrap this functionality into a self-sufficient Observable. This Observable will spawn a new subprocess, emit its output with onNext and also properly handle onError and onComplete notifications:

// ProcessObservable.php 
class ProcessObservable extends Observable { 
  private $cmd; 
  private $pidFile; 
 
  public function __construct($cmd, $pidFile = null) { 
    $this->cmd = $cmd; 
    $this->pidFile = $pidFile; 
  } 
 
  public function subscribe($observer, $scheduler = null) { 
    $process = new Process($this->cmd); 
    $process->start(); 
 
    $pid = $process->getPid(); 
    if ($this->pidFile) { 
      file_put_contents($this->pidFile, $pid); 
    } 
 
    $disposable = new CompositeDisposable(); 
    $autoObs = new AutoDetachObserver($observer...
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