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Added GroupDependency.

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Qiang Xue
2013-06-12 21:45:12 -04:00
parent b06d7a8675
commit 00df1e88eb
1 changed files with 72 additions and 0 deletions
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framework/yii/caching/GroupDependency.php Normal file
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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;
/**
* GroupDependency marks a cached data item with a group name.
*
* You may invalidate the cached data items with the same group name all at once
* by calling [[invalidate()]].
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @since 2.0
*/
class GroupDependency extends Dependency
{
/**
* @var string the group name
*/
public $group;
/**
* Constructor.
* @param string $group the group name
* @param array $config name-value pairs that will be used to initialize the object properties
*/
public function __construct($group, $config = array())
{
$this->group = $group;
parent::__construct($config);
}
/**
* Generates the data needed to determine if dependency has been changed.
* This method does nothing in this class.
* @param Cache $cache the cache component that is currently evaluating this dependency
* @return mixed the data needed to determine if dependency has been changed.
*/
protected function generateDependencyData($cache)
{
if ($cache->get(array(__CLASS__, $this->group)) === false) {
// If the cutoff timestamp is not initialized or is swapped out of the cache, we need to set it.
$this->invalidate($cache, array(__CLASS__, $this->group));
}
return microtime(true);
}
/**
* Performs the actual dependency checking.
* @param Cache $cache the cache component that is currently evaluating this dependency
* @return boolean whether the dependency is changed or not.
*/
public function getHasChanged($cache)
{
$time = $cache->get(array(__CLASS__, $this->group));
return $time === false || $time > $this->data;
}
/**
* Invalidates all of the cached data items that have the same [[group]].
* @param Cache $cache the cache component that caches the data items
* @param string $group the group name
*/
public static function invalidate($cache, $group)
{
$cache->set(array(__CLASS__, $group), microtime(true));
}
}