GroupRegistry.php

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<?php
namespace Magento\Customer\Model;

use Magento\Customer\Api\Data\GroupInterface;
use Magento\Framework\Exception\NoSuchEntityException;

class GroupRegistry
{
    protected $registry = [];

    protected $groupFactory;

    public function __construct(GroupFactory $groupFactory)
    {
        $this->groupFactory = $groupFactory;
    }

    public function retrieve($groupId)
    {
        if (isset($this->registry[$groupId])) {
            return $this->registry[$groupId];
        }
        $group = $this->groupFactory->create();
        $group->load($groupId);
        if ($group->getId() === null || $group->getId() != $groupId) {
            throw NoSuchEntityException::singleField(GroupInterface::ID, $groupId);
        }
        $this->registry[$groupId] = $group;
        return $group;
    }

    public function remove($groupId)
    {
        unset($this->registry[$groupId]);
    }
}