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<?php
/**
* CAS_PGTStorage_Cache.php - PGTStorage backend using StudipCache
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* @author Elmar Ludwig
* @license http://www.gnu.org/licenses/gpl-2.0.html GPL version 2
* @category Stud.IP
*/
class CAS_PGTStorage_Cache extends CAS_PGTStorage_AbstractStorage
{
/**
* This method returns an informational string giving the type of storage
* used by the object (used for debugging purposes).
*
* @return an informational string.
*/
public function getStorageType()
{
return 'cache';
}
/**
* This method returns an informational string giving informations on the
* parameters of the storage (used for debugging purposes).
*
* @return an informational string.
*/
public function getStorageInfo()
{
return 'type=' . Config::get()->SYSTEMCACHE['type'];
}
/**
* This method stores a PGT and its corresponding PGT Iou in the cache.
*
* @param string $pgt the PGT
* @param string $pgt_iou the PGT iou
*/
public function write($pgt, $pgt_iou)
{
$cache = StudipCacheFactory::getCache();
$cache_key = 'pgtiou/' . $pgt_iou;
return $cache->write($cache_key, $pgt);
}
/**
* This method reads a PGT corresponding to a PGT Iou and deletes the
* corresponding cache entry.
*
* @param string $pgt_iou the PGT iou
*
* @return the corresponding PGT, or FALSE on error
*/
public function read($pgt_iou)
{
$cache = StudipCacheFactory::getCache();
$cache_key = 'pgtiou/' . $pgt_iou;
$pgt = $cache->read($cache_key);
$cache->expire($cache_key);
return $pgt;
}
}
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