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<?php
/**
* @link http://www.yiiframework.com/
* @copyright Copyright (c) 2008 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
namespace yii\caching;
use Yii;
use yii\base\InvalidConfigException;
/**
* FileDependency represents a dependency based on a file's last modification time.
*
* If the last modification time of the file specified via [[fileName]] is changed,
* the dependency is considered as changed.
*
* For more details and usage information on Cache, see the [guide article on caching](guide:caching-overview).
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @since 2.0
*/
class FileDependency extends Dependency
{
/**
* @var string the file path or [path alias](guide:concept-aliases) whose last modification time is used to
* check if the dependency has been changed.
*/
public $fileName;
/**
* Generates the data needed to determine if dependency has been changed.
* This method returns the file's last modification time.
* @param CacheInterface $cache the cache component that is currently evaluating this dependency
* @return mixed the data needed to determine if dependency has been changed.
* @throws InvalidConfigException if [[fileName]] is not set
*/
protected function generateDependencyData($cache)
{
if ($this->fileName === null) {
throw new InvalidConfigException('FileDependency::fileName must be set');
}
$fileName = Yii::getAlias($this->fileName);
clearstatcache(false, $fileName);
return @filemtime($fileName);
}
}