Converter.php

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

use Magento\Framework\Stdlib\BooleanUtils;
use Magento\Framework\MessageQueue\DefaultValueProvider;

class Converter implements \Magento\Framework\Config\ConverterInterface
{
    private $booleanUtils;

    private $defaultValueProvider;

    public function __construct(BooleanUtils $booleanUtils, DefaultValueProvider $defaultValueProvider)
    {
        $this->booleanUtils = $booleanUtils;
        $this->defaultValueProvider = $defaultValueProvider;
    }

    public function convert($source)
    {
        $result = [];
        foreach ($source->getElementsByTagName('publisher') as $publisherConfig) {
            $topic = $this->getAttributeValue($publisherConfig, 'topic');

            $connections = [];
            foreach ($publisherConfig->childNodes as $connectionConfig) {
                if ($connectionConfig->nodeName != 'connection' || $connectionConfig->nodeType != XML_ELEMENT_NODE) {
                    continue;
                }
                $connectionName = $this->getAttributeValue($connectionConfig, 'name');
                if (!$connectionName) {
                    throw new \InvalidArgumentException('Connection name is missing');
                }
                $exchangeName = $this->getAttributeValue(
                    $connectionConfig,
                    'exchange',
                    $this->defaultValueProvider->getExchange()
                );
                $isDisabled = $this->getAttributeValue($connectionConfig, 'disabled', false);
                $connections[$connectionName] = [
                    'name' => $connectionName,
                    'exchange' => $exchangeName,
                    'disabled' => $this->booleanUtils->toBoolean($isDisabled),
                ];
            }
            $isDisabled = $this->getAttributeValue($publisherConfig, 'disabled', false);
            $result[$topic] = [
                'topic' => $topic,
                'disabled' => $this->booleanUtils->toBoolean($isDisabled),
                'connections' => $connections,

            ];
        }
        return $result;
    }

    private function getAttributeValue(\DOMNode $node, $attributeName, $default = null)
    {
        $item = $node->attributes->getNamedItem($attributeName);
        return $item ? $item->nodeValue : $default;
    }
}