DataCollection.php

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<?php
namespace Magento\Indexer\Ui\DataProvider\Indexer;

use Magento\Framework\Data\Collection;
use Magento\Framework\Data\Collection\EntityFactoryInterface;
use Magento\Framework\Indexer\ConfigInterface;
use Magento\Framework\Indexer\IndexerRegistry;

class DataCollection extends Collection
{
    private $config;

    private $indexerRegistry;

    public function __construct(
        EntityFactoryInterface $entityFactory,
        ConfigInterface $config,
        IndexerRegistry $indexerRegistry
    ) {
        $this->config = $config;
        $this->indexerRegistry = $indexerRegistry;
        parent::__construct($entityFactory);
    }

    public function loadData($printQuery = false, $logQuery = false)
    {
        if (!$this->isLoaded()) {
            foreach (array_keys($this->config->getIndexers()) as $indexerId) {
                $indexer = $this->indexerRegistry->get($indexerId);
                $item = $this->getNewEmptyItem();
                $data = [
                    'indexer_id' => $indexer->getId(),
                    'title' => $indexer->getTitle(),
                    'description' => $indexer->getDescription(),
                    'is_scheduled' => $indexer->isScheduled(),
                    'status' => $indexer->getStatus(),
                    'updated' => $indexer->getLatestUpdated(),
                ];
                $this->addItem($item->setData($data));
            }
            $this->_setIsLoaded(true);
        }
        return $this;
    }
}