CustomerGroupDimensionProvider.php

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<?php
declare(strict_types=1);

namespace Magento\Customer\Model\Indexer;

use Magento\Customer\Model\ResourceModel\Group\CollectionFactory as CustomerGroupCollectionFactory;
use Magento\Framework\Indexer\DimensionFactory;
use Magento\Framework\Indexer\DimensionProviderInterface;

class CustomerGroupDimensionProvider implements DimensionProviderInterface
{
    const DIMENSION_NAME = 'cg';

    private $collectionFactory;

    private $customerGroupsDataIterator;

    private $dimensionFactory;

    public function __construct(CustomerGroupCollectionFactory $collectionFactory, DimensionFactory $dimensionFactory)
    {
        $this->dimensionFactory = $dimensionFactory;
        $this->collectionFactory = $collectionFactory;
    }

    public function getIterator(): \Traversable
    {
        foreach ($this->getCustomerGroups() as $customerGroup) {
            yield $this->dimensionFactory->create(self::DIMENSION_NAME, (string)$customerGroup);
        }
    }

    private function getCustomerGroups(): array
    {
        if ($this->customerGroupsDataIterator === null) {
            $customerGroups = $this->collectionFactory->create()->getAllIds();
            $this->customerGroupsDataIterator = is_array($customerGroups) ? $customerGroups : [];
        }

        return $this->customerGroupsDataIterator;
    }
}