Config.php

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<?php
namespace Magento\Framework\MessageQueue\Publisher;

use Magento\Framework\Exception\LocalizedException;
use Magento\Framework\Phrase;
use \Magento\Framework\MessageQueue\Publisher\Config\PublisherConfigItem\Iterator;

class Config implements ConfigInterface
{
    private $iterator;

    public function __construct(Iterator $iterator)
    {
        $this->iterator = $iterator;
    }

    public function getPublisher($topic)
    {
        $publisher = $this->iterator[$topic];
        if (!$publisher) {
            throw new LocalizedException(
                new Phrase("Publisher '%publisher' is not declared.", ['publisher' => $topic])
            );
        }
        return $publisher;
    }

    public function getPublishers()
    {
        return $this->iterator;
    }
}