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<?php
/**
* @author PhileCMS
* @link https://philecms.github.io
* @license http://opensource.org/licenses/MIT
*/
namespace Phile\Http;
use Iterator;
use IteratorAggregate;
use IteratorIterator;
use Psr\Http\Server\MiddlewareInterface;
use SplPriorityQueue;
* Middleware queue
class MiddlewareQueue implements IteratorAggregate
{
public const DEFAULT_PRIORITY = 100;
/** @var int counter for FIFO order for items with same priority */
protected $serial = PHP_INT_MAX;
/** @var SplPriorityQueue middleware */
protected $queue;
public function __construct()
$this->queue = new SplPriorityQueue();
}
* Adds middleware to queue
*
* @param MiddlewareInterface $middleware
* @param int $priority
* @return self
public function add(MiddlewareInterface $middleware, int $priority = self::DEFAULT_PRIORITY): self
$this->queue->insert($middleware, [$priority, $this->serial--]);
return $this;
* Implements IteratorAggregate
* @return \Iterator
public function getIterator(): Iterator
return new IteratorIterator($this->queue);
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