4 * This file is part of the Symfony package.
6 * (c) Fabien Potencier <fabien@symfony.com>
8 * For the full copyright and license information, please view the LICENSE
9 * file that was distributed with this source code.
12 namespace Symfony\Component\HttpKernel\CacheWarmer;
15 * Interface for classes able to warm up the cache.
17 * @author Fabien Potencier <fabien@symfony.com>
19 interface CacheWarmerInterface extends WarmableInterface
22 * Checks whether this warmer is optional or not.
24 * Optional warmers can be ignored on certain conditions.
26 * A warmer should return true if the cache can be
27 * generated incrementally and on-demand.
29 * @return bool true if the warmer is optional, false otherwise
31 public function isOptional();