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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;
use Symfony\Component\Config\Resource\ResourceInterface;
use Symfony\Component\Filesystem\Exception\IOException;
use Symfony\Component\Filesystem\Filesystem;
/**
* ConfigCache manages PHP cache files.
*
* When debug is enabled, it knows when to flush the cache
* thanks to an array of ResourceInterface instances.
*
* @author Fabien Potencier <fabien@symfony.com>
*/
class ConfigCache
{
private $debug;
private $file;
/**
* Constructor.
*
* @param string $file The absolute cache path
* @param bool $debug Whether debugging is enabled or not
*/
public function __construct($file, $debug)
{
$this->file = $file;
$this->debug = (bool) $debug;
}
/**
* Gets the cache file path.
*
* @return string The cache file path
*/
public function __toString()
{
return $this->file;
}
/**
* Checks if the cache is still fresh.
*
* This method always returns true when debug is off and the
* cache file exists.
*
* @return bool true if the cache is fresh, false otherwise
*/
public function isFresh()
{
if (!is_file($this->file)) {
return false;
}
if (!$this->debug) {
return true;
}
$metadata = $this->getMetaFile();
if (!is_file($metadata)) {
return false;
}
$time = filemtime($this->file);
$meta = unserialize(file_get_contents($metadata));
foreach ($meta as $resource) {
if (!$resource->isFresh($time)) {
return false;
}
}
return true;
}
/**
* Writes cache.
*
* @param string $content The content to write in the cache
* @param ResourceInterface[] $metadata An array of ResourceInterface instances
*
* @throws \RuntimeException When cache file can't be written
*/
public function write($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 && true === $this->debug) {
$filesystem->dumpFile($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';
}
}
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