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Filename : SelfCheckingResourceChecker.php
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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\Resource;

use Symfony\Component\Config\ResourceCheckerInterface;

/**
 * Resource checker for instances of SelfCheckingResourceInterface.
 *
 * As these resources perform the actual check themselves, we can provide
 * this class as a standard way of validating them.
 *
 * @author Matthias Pigulla <mp@webfactory.de>
 */
class SelfCheckingResourceChecker implements ResourceCheckerInterface
{
    // Common shared cache, because this checker can be used in different
    // situations. For example, when using the full stack framework, the router
    // and the container have their own cache. But they may check the very same
    // resources
    private static $cache = [];

    public function supports(ResourceInterface $metadata)
    {
        return $metadata instanceof SelfCheckingResourceInterface;
    }

    /**
     * @param SelfCheckingResourceInterface $resource
     */
    public function isFresh(ResourceInterface $resource, int $timestamp)
    {
        $key = "$resource:$timestamp";

        return self::$cache[$key] ?? self::$cache[$key] = $resource->isFresh($timestamp);
    }
}