VariationCacheFactory.php

<?php

namespace Drupal\Core\Cache;

use Drupal\Core\Cache\Context\CacheContextsManager;
use Symfony\Component\HttpFoundation\RequestStack;

/**
 * Defines the variation cache factory.
 *
 * @ingroup cache
 */
class VariationCacheFactory implements VariationCacheFactoryInterface {
    
    /**
     * Instantiated variation cache bins.
     *
     * @var \Drupal\Core\Cache\VariationCacheInterface[]
     */
    protected $bins = [];
    
    /**
     * Constructs a new VariationCacheFactory object.
     *
     * @param \Symfony\Component\HttpFoundation\RequestStack $requestStack
     *   The request stack.
     * @param \Drupal\Core\Cache\CacheFactoryInterface $cacheFactory
     *   The cache factory.
     * @param \Drupal\Core\Cache\Context\CacheContextsManager $cacheContextsManager
     *   The cache contexts manager.
     */
    public function __construct(RequestStack $requestStack, CacheFactoryInterface $cacheFactory, CacheContextsManager $cacheContextsManager) {
    }
    
    /**
     * {@inheritdoc}
     */
    public function get($bin) {
        if (!isset($this->bins[$bin])) {
            $this->bins[$bin] = new VariationCache($this->requestStack, $this->cacheFactory
                ->get($bin), $this->cacheContextsManager);
        }
        return $this->bins[$bin];
    }

}