AbstractIndexerCommand.php

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<?php
namespace Magento\Indexer\Console\Command;

use Magento\Backend\App\Area\FrontNameResolver;
use Magento\Framework\ObjectManagerInterface;
use Symfony\Component\Console\Command\Command;
use Magento\Framework\Indexer\IndexerInterface;
use Magento\Framework\App\ObjectManagerFactory;

abstract class AbstractIndexerCommand extends Command
{
    private $objectManagerFactory;

    private $objectManager;

    private $collectionFactory;

    public function __construct(
        ObjectManagerFactory $objectManagerFactory,
        \Magento\Indexer\Model\Indexer\CollectionFactory $collectionFactory = null
    ) {
        $this->objectManagerFactory = $objectManagerFactory;
        $this->collectionFactory = $collectionFactory;
        parent::__construct();
    }

    protected function getAllIndexers()
    {
        $indexers = $this->getCollectionFactory()->create()->getItems();
        return array_combine(
            array_map(
                function ($item) {
                    return $item->getId();
                },
                $indexers
            ),
            $indexers
        );
    }

    protected function getObjectManager()
    {
        if (null == $this->objectManager) {
            $area = FrontNameResolver::AREA_CODE;
            $this->objectManager = $this->objectManagerFactory->create($_SERVER);
            $appState = $this->objectManager->get(\Magento\Framework\App\State::class);
            $appState->setAreaCode($area);
            $configLoader = $this->objectManager->get(\Magento\Framework\ObjectManager\ConfigLoaderInterface::class);
            $this->objectManager->configure($configLoader->load($area));
        }
        return $this->objectManager;
    }

    private function getCollectionFactory()
    {
        if (null === $this->collectionFactory) {
            $this->collectionFactory = $this->getObjectManager()
                ->get(\Magento\Indexer\Model\Indexer\CollectionFactory::class);
        }
        return $this->collectionFactory;
    }
}