Testing using timers for data imports.

gistfile1.php

<?php                                                                                                                                                                                                              
                                                                                                                                                                                                                     
require dirname(__DIR__) . '/vendor/autoload.php';                                                                                                                                                                 
                                                                                                                                                                                                                     
class Test                                                                                                                                                                                                         
{                                                                                                                                                                                                                  
      protected $counter = 1;                                                                                                                                                                                        
                                                                                                                                                                                                                     
      public function __invoke($signature, $loop)                                                                                                                                                                    
      {                                                                                                                                                                                                              
          echo "In iteration {$this->counter}\n";                                                                                                                                                                    
          $this->counter++;                                                                                                                                                                                          
          $time = $this->counter % 2 ? 1 : 5;                                                                                                                                                                        
          echo "Next callback in $time seconds\n";                                                                                                                                                                   
          $loop->addTimer($time, $this);                                                                                                                                                                             
      }                                                                                                                                                                                                              
  }                                                                                                                                                                                                                  
                                                                                                                                                                                                                     
  $loop = new React\EventLoop\StreamSelectLoop;                                                                                                                                                                      
  //$loop = new React\EventLoop\LibEventLoop;                                                                                                                                                                        
  printf("Loop instance of %s\n", get_class($loop));                                                                                                                                                                 
                                                                                                                                                                                                                     
  $loop->addTimer(1, new Test);                                                                                                                                                                                      
                                                                                                                                                                                                                     
  $loop->addPeriodicTimer(5, function () {                                                                                                                                                                           
      $memory = memory_get_usage() / 1024;                                                                                                                                                                           
      $formatted = number_format($memory, 3).'K';                                                                                                                                                                    
      echo "Current memory usage: {$formatted}\n";                                                                                                                                                                   
  });                                                                                                                                                                                                                
                                                                                                                                                                                                                     
  $loop->run();