Version 1

[yaffs-website] / vendor / symfony / config / ResourceCheckerConfigCache.php

diff --git a/vendor/symfony/config/ResourceCheckerConfigCache.php b/vendor/symfony/config/ResourceCheckerConfigCache.php
new file mode 100644 (file)
index 0000000..0e3a411
--- /dev/null
+++ b/vendor/symfony/config/ResourceCheckerConfigCache.php
@@ -0,0 +1,164 @@
+<?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';
+    }
+}