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admin/phpMyAdmin/vendor/symfony/config/Resource/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);
+    }
+}