/**
* Run the queue
*
* @return \Generator
*/
public function __invoke()
{
while (!$this->queue->isEmpty()) {
usleep(self::SLEEP_MICRO_SECONDS);
$pending = $this->getPending();
if ($pending->count() && $this->getRunning()->count() < $this->limit) {
(yield $pending->shift());
} else {
(yield new NullProcess());
}
$this->clearCompleted();
}
}
/**
* Test collection empty method
*
* @return void
*/
public function testIsEmpty()
{
$this->assertFalse($this->collection->isEmpty());
$this->collection->clear();
$this->assertTrue($this->collection->isEmpty());
}