--- /dev/null
+<?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 ConfigCache.
+ *
+ * @author Matthias Pigulla <mp@webfactory.de>
+ */
+interface ConfigCacheInterface
+{
+ /**
+ * Gets the cache file path.
+ *
+ * @return string The cache file path
+ */
+ public function getPath();
+
+ /**
+ * Checks if the cache is still fresh.
+ *
+ * This check should take the metadata passed to the write() method into consideration.
+ *
+ * @return bool Whether the cache is still fresh
+ */
+ public function isFresh();
+
+ /**
+ * Writes the given content into the cache file. Metadata will be stored
+ * independently and can be used to check cache freshness at a later time.
+ *
+ * @param string $content The content to write into the cache
+ * @param ResourceInterface[]|null $metadata An array of ResourceInterface instances
+ *
+ * @throws \RuntimeException When the cache file cannot be written
+ */
+ public function write($content, array $metadata = null);
+}