CachedStrategy.php

<?php

declare (strict_types=1);
namespace Drupal\Core\Render\Placeholder;

use Drupal\Core\Render\RenderCacheInterface;

/**
 * Looks up placeholders in the render cache and returns those we could find.
 */
class CachedStrategy implements PlaceholderStrategyInterface {
    public function __construct(PlaceholderStrategyInterface $placeholderStrategy, RenderCacheInterface $renderCache) {
    }
    
    /**
     * {@inheritdoc}
     */
    public function processPlaceholders(array $placeholders) {
        return $this->renderCache
            ->getMultiple($placeholders);
    }

}