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Dir : ~/var/www/shopware/vendor/symfony/messenger/

Edit File: MessageBus.php

<?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;

use Symfony\Component\Messenger\Middleware\MiddlewareInterface;
use Symfony\Component\Messenger\Middleware\StackMiddleware;

/**
 * @author Samuel Roze <samuel.roze@gmail.com>
 * @author Matthias Noback <matthiasnoback@gmail.com>
 * @author Nicolas Grekas <p@tchwork.com>
 */
class MessageBus implements MessageBusInterface
{
    private $middlewareAggregate;

/**
     * @param iterable<mixed, MiddlewareInterface> $middlewareHandlers
     */
    public function __construct(iterable $middlewareHandlers = [])
    {
        if ($middlewareHandlers instanceof \IteratorAggregate) {
            $this->middlewareAggregate = $middlewareHandlers;
        } elseif (\is_array($middlewareHandlers)) {
            $this->middlewareAggregate = new \ArrayObject($middlewareHandlers);
        } else {
            // $this->middlewareAggregate should be an instance of IteratorAggregate.
            // When $middlewareHandlers is an Iterator, we wrap it to ensure it is lazy-loaded and can be rewound.
            $this->middlewareAggregate = new class($middlewareHandlers) implements \IteratorAggregate {
                private $middlewareHandlers;
                private $cachedIterator;

public function __construct(\Traversable $middlewareHandlers)
                {
                    $this->middlewareHandlers = $middlewareHandlers;
                }

public function getIterator(): \Traversable
                {
                    if (null === $this->cachedIterator) {
                        $this->cachedIterator = new \ArrayObject(iterator_to_array($this->middlewareHandlers, false));
                    }

return $this->cachedIterator;
                }
            };
        }
    }

/**
     * {@inheritdoc}
     */
    public function dispatch(object $message, array $stamps = []): Envelope
    {
        $envelope = Envelope::wrap($message, $stamps);
        $middlewareIterator = $this->middlewareAggregate->getIterator();

while ($middlewareIterator instanceof \IteratorAggregate) {
            $middlewareIterator = $middlewareIterator->getIterator();
        }
        $middlewareIterator->rewind();

if (!$middlewareIterator->valid()) {
            return $envelope;
        }
        $stack = new StackMiddleware($middlewareIterator);

return $middlewareIterator->current()->handle($envelope, $stack);
    }
}