Exchange.php

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<?php
namespace Magento\Framework\Amqp\Bulk;

use Magento\Framework\MessageQueue\Bulk\ExchangeInterface;
use PhpAmqpLib\Message\AMQPMessage;
use Magento\Framework\Communication\ConfigInterface as CommunicationConfigInterface;
use Magento\Framework\MessageQueue\Publisher\ConfigInterface as PublisherConfig;

class Exchange implements ExchangeInterface
{
    private $amqpConfig;

    private $communicationConfig;

    private $publisherConfig;

    private $exchange;

    public function __construct(
        \Magento\Framework\Amqp\Config $amqpConfig,
        PublisherConfig $publisherConfig,
        CommunicationConfigInterface $communicationConfig,
        \Magento\Framework\Amqp\Exchange $exchange
    ) {
        $this->amqpConfig = $amqpConfig;
        $this->communicationConfig = $communicationConfig;
        $this->publisherConfig = $publisherConfig;
        $this->exchange = $exchange;
    }

    public function enqueue($topic, array $envelopes)
    {
        $topicData = $this->communicationConfig->getTopic($topic);
        $isSync = $topicData[CommunicationConfigInterface::TOPIC_IS_SYNCHRONOUS];

        if ($isSync) {
            $responses = [];
            foreach ($envelopes as $envelope) {
                $responses[] = $this->exchange->enqueue($topic, $envelope);
            }
            return $responses;
        }

        $channel = $this->amqpConfig->getChannel();
        $publisher = $this->publisherConfig->getPublisher($topic);
        $exchange = $publisher->getConnection()->getExchange();

        foreach ($envelopes as $envelope) {
            $msg = new AMQPMessage($envelope->getBody(), $envelope->getProperties());
            $channel->batch_basic_publish($msg, $exchange, $topic);
        }
        $channel->publish_batch();

        return null;
    }
}