<?php /* * This file is part of the Symfony package. * * (c) Fabien Potencier <fabien@symfony.com> * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace Symfony\Component\Messenger\Middleware; /** * @author Nicolas Grekas <p@tchwork.com> * * Implementations must be cloneable, and each clone must unstack the stack independently. */ interface StackInterface { /** * Returns the next middleware to process a message. */ public function next(): MiddlewareInterface; }