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