ExchangeRepository.php

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<?php
namespace Magento\Framework\MessageQueue;

class ExchangeRepository
{
    private $objectManager;

    private $exchangeFactory;

    private $exchangePool = [];

    public function __construct(\Magento\Framework\ObjectManagerInterface $objectManager, array $exchanges = [])
    {
        $this->objectManager = $objectManager;
    }

    public function getByConnectionName($connectionName)
    {
        if (!isset($this->exchangePool[$connectionName])) {
            $exchange = $this->getExchangeFactory()->create($connectionName);
            $this->exchangePool[$connectionName] = $exchange;
        }
        return $this->exchangePool[$connectionName];
    }

    private function getExchangeFactory()
    {
        if ($this->exchangeFactory === null) {
            $this->exchangeFactory = $this->objectManager->get(ExchangeFactoryInterface::class);
        }
        return $this->exchangeFactory;
    }
}