CollectionByPagesIterator.php

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<?php
namespace Magento\ImportExport\Model\ResourceModel;

class CollectionByPagesIterator
{
    public function iterate(\Magento\Framework\Data\Collection\AbstractDb $collection, $pageSize, array $callbacks)
    {
        $paginatedCollection = null;
        $pageNumber = 1;
        do {
            $paginatedCollection = clone $collection;
            $paginatedCollection->clear();

            $paginatedCollection->setPageSize($pageSize)->setCurPage($pageNumber);

            if ($paginatedCollection->count() > 0) {
                foreach ($paginatedCollection as $item) {
                    foreach ($callbacks as $callback) {
                        call_user_func($callback, $item);
                    }
                }
            }

            $pageNumber++;
        } while ($pageNumber <= $paginatedCollection->getLastPageNumber());

        $paginatedCollection->clear();
        unset($paginatedCollection);
    }
}