DependencyInfoProvider.php

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<?php
declare(strict_types=1);

namespace Magento\Framework\Indexer\Config;

use Magento\Framework\Exception\NoSuchEntityException;
use Magento\Framework\Indexer\ConfigInterface;
use Magento\Framework\Phrase;

class DependencyInfoProvider implements DependencyInfoProviderInterface
{
    private $config;

    public function __construct(ConfigInterface $config)
    {
        $this->config = $config;
    }

    public function getIndexerIdsToRunBefore(string $indexerId): array
    {
        return $this->getIndexerDataWithValidation($indexerId)['dependencies'];
    }

    public function getIndexerIdsToRunAfter(string $indexerId): array
    {
        $this->getIndexerDataWithValidation($indexerId);
        $result = [];
        foreach ($this->config->getIndexers() as $id => $indexerData) {
            if (array_search($indexerId, $indexerData['dependencies']) !== false) {
                $result[] = $id;
            }
        };

        return $result;
    }

    private function getIndexerData(string $indexerId): array
    {
        return $this->config->getIndexer($indexerId);
    }

    private function getIndexerDataWithValidation(string $indexerId): array
    {
        $indexerData = $this->getIndexerData($indexerId);
        if (!isset($indexerData['indexer_id']) || $indexerData['indexer_id'] != $indexerId) {
            throw new NoSuchEntityException(
                new Phrase("%1 indexer does not exist.", [$indexerId])
            );
        }

        return $indexerData;
    }
}