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- 06.01.2017
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ResourceCheckerConfigCache.php
001 <?php
002
003 /*
004 * This file is part of the Symfony package.
005 *
006 * (c) Fabien Potencier <fabien@symfony.com>
007 *
008 * For the full copyright and license information, please view the LICENSE
009 * file that was distributed with this source code.
010 */
011
012 namespace Symfony\Component\Config;
013
014 use Symfony\Component\Config\Resource\ResourceInterface;
015 use Symfony\Component\Filesystem\Exception\IOException;
016 use Symfony\Component\Filesystem\Filesystem;
017
018 /**
019 * ResourceCheckerConfigCache uses instances of ResourceCheckerInterface
020 * to check whether cached data is still fresh.
021 *
022 * @author Matthias Pigulla <mp@webfactory.de>
023 */
024 class ResourceCheckerConfigCache implements ConfigCacheInterface
025 {
026 /**
027 * @var string
028 */
029 private $file;
030
031 /**
032 * @var ResourceCheckerInterface[]
033 */
034 private $resourceCheckers;
035
036 /**
037 * @param string $file The absolute cache path
038 * @param ResourceCheckerInterface[] $resourceCheckers The ResourceCheckers to use for the freshness check
039 */
040 public function __construct($file, array $resourceCheckers = array())
041 {
042 $this->file = $file;
043 $this->resourceCheckers = $resourceCheckers;
044 }
045
046 /**
047 * {@inheritdoc}
048 */
049 public function getPath()
050 {
051 return $this->file;
052 }
053
054 /**
055 * Checks if the cache is still fresh.
056 *
057 * This implementation will make a decision solely based on the ResourceCheckers
058 * passed in the constructor.
059 *
060 * The first ResourceChecker that supports a given resource is considered authoritative.
061 * Resources with no matching ResourceChecker will silently be ignored and considered fresh.
062 *
063 * @return bool true if the cache is fresh, false otherwise
064 */
065 public function isFresh()
066 {
067 if (!is_file($this->file)) {
068 return false;
069 }
070
071 if (!$this->resourceCheckers) {
072 return true; // shortcut - if we don't have any checkers we don't need to bother with the meta file at all
073 }
074
075 $metadata = $this->getMetaFile();
076 if (!is_file($metadata)) {
077 return true;
078 }
079
080 $time = filemtime($this->file);
081 $meta = unserialize(file_get_contents($metadata));
082
083 foreach ($meta as $resource) {
084 /* @var ResourceInterface $resource */
085 foreach ($this->resourceCheckers as $checker) {
086 if (!$checker->supports($resource)) {
087 continue; // next checker
088 }
089 if ($checker->isFresh($resource, $time)) {
090 break; // no need to further check this resource
091 }
092
093 return false; // cache is stale
094 }
095 // no suitable checker found, ignore this resource
096 }
097
098 return true;
099 }
100
101 /**
102 * Writes cache.
103 *
104 * @param string $content The content to write in the cache
105 * @param ResourceInterface[] $metadata An array of metadata
106 *
107 * @throws \RuntimeException When cache file can't be written
108 */
109 public function write($content, array $metadata = null)
110 {
111 $mode = 0666;
112 $umask = umask();
113 $filesystem = new Filesystem();
114 $filesystem->dumpFile($this->file, $content, null);
115 try {
116 $filesystem->chmod($this->file, $mode, $umask);
117 } catch (IOException $e) {
118 // discard chmod failure (some filesystem may not support it)
119 }
120
121 if (null !== $metadata) {
122 $filesystem->dumpFile($this->getMetaFile(), serialize($metadata), null);
123 try {
124 $filesystem->chmod($this->getMetaFile(), $mode, $umask);
125 } catch (IOException $e) {
126 // discard chmod failure (some filesystem may not support it)
127 }
128 }
129 }
130
131 /**
132 * Gets the meta file path.
133 *
134 * @return string The meta file path
135 */
136 private function getMetaFile()
137 {
138 return $this->file.'.meta';
139 }
140 }
141