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<?php
/**
* PHPIDS
*
* Requirements: PHP5, SimpleXML
*
* Copyright (c) 2008 PHPIDS group (https://phpids.org)
*
* PHPIDS is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, version 3 of the License, or
* (at your option) any later version.
*
* PHPIDS is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with PHPIDS. If not, see <http://www.gnu.org/licenses/>.
*
* PHP version 5.1.6+
*
* @category Security
* @package PHPIDS
* @author Mario Heiderich <mario.heiderich@gmail.com>
* @author Christian Matthies <ch0012@gmail.com>
* @author Lars Strojny <lars@strojny.net>
* @license http://www.gnu.org/licenses/lgpl.html LGPL
* @link http://php-ids.org/
*/
namespace IDS\Caching;
/**
* APC caching wrapper
*
* This class inhabits functionality to get and set cache via memcached.
*
* @category Security
* @package PHPIDS
* @author Yves Berkholz <godzilla80@gmx.net>
* @copyright 2007-2009 The PHPIDS Groupoup
* @license http://www.gnu.org/licenses/lgpl.html LGPL
* @link http://php-ids.org/
* @since Version 0.6.5
*/
class ApcCache implements CacheInterface
{
/**
* Caching type
*
* @var string
*/
private $type = null;
/**
* Cache configuration
*
* @var array
*/
private $config = null;
/**
* Flag if the filter storage has been found in memcached
*
* @var boolean
*/
private $isCached = false;
/**
* Holds an instance of this class
*
* @var object
*/
private static $cachingInstance = null;
/**
* Constructor
*
* @param string $type caching type
* @param array $init the IDS_Init object
*
* @return void
*/
public function __construct($type, $init)
{
$this->type = $type;
$this->config = $init->config['Caching'];
}
/**
* Returns an instance of this class
*
* @param string $type caching type
* @param object $init the IDS_Init object
*
* @return object $this
*/
public static function getInstance($type, $init)
{
if (!self::$cachingInstance) {
self::$cachingInstance = new ApcCache($type, $init);
}
return self::$cachingInstance;
}
/**
* Writes cache data
*
* @param array $data the caching data
*
* @return object $this
*/
public function setCache(array $data)
{
if (!$this->isCached) {
apc_store(
$this->config['key_prefix'] . '.storage',
$data,
$this->config['expiration_time']
);
}
return $this;
}
/**
* Returns the cached data
*
* Note that this method returns false if either type or file cache is
* not set
*
* @return mixed cache data or false
*/
public function getCache()
{
$data = apc_fetch($this->config['key_prefix'] . '.storage');
$this->isCached = !empty($data);
return $data;
}
}