Publisher.php

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<?php
namespace Magento\Framework\MessageQueue;

use Magento\Framework\Amqp\Config as AmqpConfig;
use Magento\Framework\MessageQueue\ConfigInterface as MessageQueueConfig;
use Magento\Framework\MessageQueue\Publisher\ConfigInterface as PublisherConfig;

class Publisher implements PublisherInterface
{
    private $exchangeRepository;

    private $envelopeFactory;

    private $messageEncoder;

    private $messageValidator;

    private $publisherConfig;

    private $amqpConfig;

    public function __construct(
        ExchangeRepository $exchangeRepository,
        EnvelopeFactory $envelopeFactory,
        MessageQueueConfig $messageQueueConfig,
        MessageEncoder $messageEncoder,
        MessageValidator $messageValidator
    ) {
        $this->exchangeRepository = $exchangeRepository;
        $this->envelopeFactory = $envelopeFactory;
        $this->messageEncoder = $messageEncoder;
        $this->messageValidator = $messageValidator;
    }

    public function publish($topicName, $data)
    {
        $this->messageValidator->validate($topicName, $data);
        $data = $this->messageEncoder->encode($topicName, $data);
        $envelope = $this->envelopeFactory->create(
            [
                'body' => $data,
                'properties' => [
                    'delivery_mode' => 2,
                    'message_id' => md5(uniqid($topicName))
                ]
            ]
        );
        $connectionName = $this->getPublisherConfig()->getPublisher($topicName)->getConnection()->getName();
        $connectionName = ($connectionName === 'amqp' && !$this->isAmqpConfigured()) ? 'db' : $connectionName;
        $exchange = $this->exchangeRepository->getByConnectionName($connectionName);
        $exchange->enqueue($topicName, $envelope);
        return null;
    }

    private function isAmqpConfigured()
    {
        return $this->getAmqpConfig()->getValue(AmqpConfig::HOST) ? true : false;
    }

    private function getPublisherConfig()
    {
        if ($this->publisherConfig === null) {
            $this->publisherConfig = \Magento\Framework\App\ObjectManager::getInstance()->get(PublisherConfig::class);
        }
        return $this->publisherConfig;
    }

    private function getAmqpConfig()
    {
        if ($this->amqpConfig === null) {
            $this->amqpConfig = \Magento\Framework\App\ObjectManager::getInstance()->get(AmqpConfig::class);
        }

        return $this->amqpConfig;
    }
}