--- /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;
+use Symfony\Component\Filesystem\Exception\IOException;
+use Symfony\Component\Filesystem\Filesystem;
+
+/**
+ * ResourceCheckerConfigCache uses instances of ResourceCheckerInterface
+ * to check whether cached data is still fresh.
+ *
+ * @author Matthias Pigulla <mp@webfactory.de>
+ */
+class ResourceCheckerConfigCache implements ConfigCacheInterface
+{
+ /**
+ * @var string
+ */
+ private $file;
+
+ /**
+ * @var ResourceCheckerInterface[]
+ */
+ private $resourceCheckers;
+
+ /**
+ * @param string $file The absolute cache path
+ * @param ResourceCheckerInterface[] $resourceCheckers The ResourceCheckers to use for the freshness check
+ */
+ public function __construct($file, array $resourceCheckers = array())
+ {
+ $this->file = $file;
+ $this->resourceCheckers = $resourceCheckers;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getPath()
+ {
+ return $this->file;
+ }
+
+ /**
+ * Checks if the cache is still fresh.
+ *
+ * This implementation will make a decision solely based on the ResourceCheckers
+ * passed in the constructor.
+ *
+ * The first ResourceChecker that supports a given resource is considered authoritative.
+ * Resources with no matching ResourceChecker will silently be ignored and considered fresh.
+ *
+ * @return bool true if the cache is fresh, false otherwise
+ */
+ public function isFresh()
+ {
+ if (!is_file($this->file)) {
+ return false;
+ }
+
+ if (!$this->resourceCheckers) {
+ return true; // shortcut - if we don't have any checkers we don't need to bother with the meta file at all
+ }
+
+ $metadata = $this->getMetaFile();
+ if (!is_file($metadata)) {
+ return false;
+ }
+
+ $e = null;
+ $meta = false;
+ $time = filemtime($this->file);
+ $signalingException = new \UnexpectedValueException();
+ $prevUnserializeHandler = ini_set('unserialize_callback_func', '');
+ $prevErrorHandler = set_error_handler(function ($type, $msg, $file, $line, $context) use (&$prevErrorHandler, $signalingException) {
+ if (E_WARNING === $type && 'Class __PHP_Incomplete_Class has no unserializer' === $msg) {
+ throw $signalingException;
+ }
+
+ return $prevErrorHandler ? $prevErrorHandler($type, $msg, $file, $line, $context) : false;
+ });
+
+ try {
+ $meta = unserialize(file_get_contents($metadata));
+ } catch (\Error $e) {
+ } catch (\Exception $e) {
+ }
+ restore_error_handler();
+ ini_set('unserialize_callback_func', $prevUnserializeHandler);
+ if (null !== $e && $e !== $signalingException) {
+ throw $e;
+ }
+ if (false === $meta) {
+ return false;
+ }
+
+ foreach ($meta as $resource) {
+ /* @var ResourceInterface $resource */
+ foreach ($this->resourceCheckers as $checker) {
+ if (!$checker->supports($resource)) {
+ continue; // next checker
+ }
+ if ($checker->isFresh($resource, $time)) {
+ break; // no need to further check this resource
+ }
+
+ return false; // cache is stale
+ }
+ // no suitable checker found, ignore this resource
+ }
+
+ return true;
+ }
+
+ /**
+ * Writes cache.
+ *
+ * @param string $content The content to write in the cache
+ * @param ResourceInterface[] $metadata An array of metadata
+ *
+ * @throws \RuntimeException When cache file can't be written
+ */
+ public function write($content, array $metadata = null)
+ {
+ $mode = 0666;
+ $umask = umask();
+ $filesystem = new Filesystem();
+ $filesystem->dumpFile($this->file, $content, null);
+ try {
+ $filesystem->chmod($this->file, $mode, $umask);
+ } catch (IOException $e) {
+ // discard chmod failure (some filesystem may not support it)
+ }
+
+ if (null !== $metadata) {
+ $filesystem->dumpFile($this->getMetaFile(), serialize($metadata), null);
+ try {
+ $filesystem->chmod($this->getMetaFile(), $mode, $umask);
+ } catch (IOException $e) {
+ // discard chmod failure (some filesystem may not support it)
+ }
+ }
+ }
+
+ /**
+ * Gets the meta file path.
+ *
+ * @return string The meta file path
+ */
+ private function getMetaFile()
+ {
+ return $this->file.'.meta';
+ }
+}