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<?php
declare(strict_types=1);
namespace Arp\EventDispatcher\Listener;
class ListenerCollection implements ListenerCollectionInterface
{
private PriorityQueue $listeners;
private int $queueOrder = PHP_INT_MAX;
public function __construct(iterable $listeners = [])
$this->listeners = new PriorityQueue();
if (!empty($listeners)) {
$this->addListeners($listeners);
}
public function addListeners(iterable $listeners, int $priority = 1): void
foreach ($listeners as $listener) {
$this->addListener($listener, $priority);
public function addListener(callable $listener, int $priority = 1): void
$this->listeners->insert($listener, [$priority, $this->queueOrder--]);
public function getIterator(): \Traversable
$iterator = clone $this->listeners;
$iterator->rewind();
return $iterator;
public function count(): int
return $this->listeners->count();
alex-patterson-webdev /
event-dispatcher
