Symfony translations database clear cache method

Translator.php

<?php
namespace AppBundle\Translation;

use Symfony\Component\Translation\Translator as BaseTranslator;

class Translator extends BaseTranslator
{    
    /**
     * @var TranslationRepositoryInterface
     */
    private $translationRepository;
    
    /**
     * @var string
     */
    private $cacheDir;
    
    /**
     * @var bool
     */
    private $checkedCache = false;
    
    public function __construct(
        $locale, 
        MessageSelector $selector = null, 
        $cacheDir = null, 
        $debug = false,
        TranslationRepositoryInterface $translationRepository
    ) {
        parent::__construct($locale, $selector, $cacheDir, $debug);
       
        $this->cacheDir = $cacheDir;
        $this->translationRepository = $translationRepository;
    }
    
    public function getCatalogue($locale = null)
    {
        $this->clearCacheIfNeeded();
        
        return parent::getCatalogue($locale);
    }
    
    private function clearCacheIfNeeded()
    {
        // we only need to check it once per request-response cycle.
        if (false === $this->checkedCache) {
            if (!file_exists($this->cacheDir)) {
                return;
            }

            // get latest updated translation for every locale (translations grouped by locale and sorted on updatedAt)
            $translations = $this->translationRepository->getLocalesForLastUpdatedAt();

            foreach ($translations as $resource) {
                $finder = Finder::create()
                    ->name('catalogue.'.$this->transformLocale($resource['locale']).'*')
                    ->in($this->cacheDir)
                    ->files()
                ;

                /** @var SplFileInfo $file */
                foreach ($finder as $file) {
                    if (!file_exists($file)) {
                        continue;
                    }

                    // check if the cache for this locale is still fresh enough
                    if ($this->resourceIsFresh($resource, @$file->getMTime())) {
                        continue;
                    }

                    // remove the catalogue cache file, since this locale has recently updated
                    unlink($file);
                }
            }

            $this->checkedCache = true;
        }
    }
    
    /**
     * @param array $resource
     * @param       $time
     *
     * @return bool
     */
    private function resourceIsFresh(array $resource, $time)
    {
        if (!$resource['updatedAt'] instanceof \DateTime) {
            if ($resource['createdAt']->getTimestamp() < $time) {
                return true;
            }
        } else {
            if ($resource['updatedAt']->getTimestamp() < $time) {
                return true;
            }
        }

        return false;
    }
}