IdentityService.php

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<?php
namespace Magento\Framework\DataObject;

use Ramsey\Uuid\Uuid;

class IdentityService implements IdentityGeneratorInterface
{
    private $uuidFactory;

    public function __construct()
    {
        $this->uuidFactory = new \Ramsey\Uuid\UuidFactory();
    }

    public function generateId()
    {
        $uuid = $this->uuidFactory->uuid4();
        return $uuid->toString();
    }

    public function generateIdForData($data)
    {
        $uuid = $this->uuidFactory->uuid3(Uuid::NAMESPACE_DNS, $data);
        return $uuid->toString();
    }
}