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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Config;
use Symfony\Component\Config\Resource\ResourceInterface;
/**
* Interface for ResourceCheckers.
*
* When a ResourceCheckerConfigCache instance is checked for freshness, all its associated
* metadata resources are passed to ResourceCheckers. The ResourceCheckers
* can then inspect the resources and decide whether the cache can be considered
* fresh or not.
*
* @author Matthias Pigulla <mp@webfactory.de>
* @author Benjamin Klotz <bk@webfactory.de>
*/
interface ResourceCheckerInterface
{
/**
* Queries the ResourceChecker whether it can validate a given
* resource or not.
*
* @param ResourceInterface $metadata The resource to be checked for freshness
*
* @return bool True if the ResourceChecker can handle this resource type, false if not
*/
public function supports(ResourceInterface $metadata);
/**
* Validates the resource.
*
* @param ResourceInterface $resource The resource to be validated
* @param int $timestamp The timestamp at which the cache associated with this resource was created
*
* @return bool True if the resource has not changed since the given timestamp, false otherwise
*/
public function isFresh(ResourceInterface $resource, $timestamp);
}
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