CompositeReader.php

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<?php
namespace Magento\Framework\MessageQueue\Topology\Config;

use Magento\Framework\Phrase;

class CompositeReader implements ReaderInterface
{
    private $validator;

    private $readers;

    public function __construct(ValidatorInterface $validator, array $readers)
    {
        $this->validator = $validator;
        $this->readers = $readers;
    }

    public function read($scope = null)
    {
        $result = [];
        foreach ($this->readers as $reader) {
            $result = array_replace_recursive($result, $reader->read($scope));
        }
        $this->validator->validate($result);
        return $result;
    }
}