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ResourceCheckerInterface.php
01 <?php
02
03 /*
04 * This file is part of the Symfony package.
05 *
06 * (c) Fabien Potencier <fabien@symfony.com>
07 *
08 * For the full copyright and license information, please view the LICENSE
09 * file that was distributed with this source code.
10 */
11
12 namespace Symfony\Component\Config;
13
14 use Symfony\Component\Config\Resource\ResourceInterface;
15
16 /**
17 * Interface for ResourceCheckers.
18 *
19 * When a ResourceCheckerConfigCache instance is checked for freshness, all its associated
20 * metadata resources are passed to ResourceCheckers. The ResourceCheckers
21 * can then inspect the resources and decide whether the cache can be considered
22 * fresh or not.
23 *
24 * @author Matthias Pigulla <mp@webfactory.de>
25 * @author Benjamin Klotz <bk@webfactory.de>
26 */
27 interface ResourceCheckerInterface
28 {
29 /**
30 * Queries the ResourceChecker whether it can validate a given
31 * resource or not.
32 *
33 * @param ResourceInterface $metadata The resource to be checked for freshness
34 *
35 * @return bool True if the ResourceChecker can handle this resource type, false if not
36 */
37 public function supports(ResourceInterface $metadata);
38
39 /**
40 * Validates the resource.
41 *
42 * @param ResourceInterface $resource The resource to be validated
43 * @param int $timestamp The timestamp at which the cache associated with this resource was created
44 *
45 * @return bool True if the resource has not changed since the given timestamp, false otherwise
46 */
47 public function isFresh(ResourceInterface $resource, $timestamp);
48 }
49