Subversion-Projekte lars-tiefland.cakephp

<?php
/* SVN FILE: $Id: memcache.php 7945 2008-12-19 02:16:01Z gwoo $ */
/**
 * Memcache storage engine for cache
 *
 *
 * PHP versions 4 and 5
 *
 * CakePHP(tm) :  Rapid Development Framework (http://www.cakephp.org)
 * Copyright 2005-2008, Cake Software Foundation, Inc. (http://www.cakefoundation.org)
 *
 * Licensed under The MIT License
 * Redistributions of files must retain the above copyright notice.
 *
 * @filesource
 * @copyright     Copyright 2005-2008, Cake Software Foundation, Inc. (http://www.cakefoundation.org)
 * @link          http://www.cakefoundation.org/projects/info/cakephp CakePHP(tm) Project
 * @package       cake
 * @subpackage    cake.cake.libs.cache
 * @since         CakePHP(tm) v 1.2.0.4933
 * @version       $Revision: 7945 $
 * @modifiedby    $LastChangedBy: gwoo $
 * @lastmodified  $Date: 2008-12-18 18:16:01 -0800 (Thu, 18 Dec 2008) $
 * @license       http://www.opensource.org/licenses/mit-license.php The MIT License
 */
/**
 * Memcache storage engine for cache
 *
 * @package       cake
 * @subpackage    cake.cake.libs.cache
 */
class MemcacheEngine extends CacheEngine {
/**
 * Memcache wrapper.
 *
 * @var object
 * @access private
 */
        var $__Memcache = null;
/**
 * settings
 *              servers = string or array of memcache servers, default => 127.0.0.1
 *              compress = boolean, default => false
 *
 * @var array
 * @access public
 */
        var $settings = array();
/**
 * Initialize the Cache Engine
 *
 * Called automatically by the cache frontend
 * To reinitialize the settings call Cache::engine('EngineName', [optional] settings = array());
 *
 * @param array $setting array of setting for the engine
 * @return boolean True if the engine has been successfully initialized, false if not
 * @access public
 */
        function init($settings = array()) {
                if (!class_exists('Memcache')) {
                        return false;
                }
                parent::init(array_merge(array(
                        'engine'=> 'Memcache', 'prefix' => Inflector::slug(APP_DIR) . '_', 'servers' => array('127.0.0.1'), 'compress'=> false
                        ), $settings)
                );

                if ($this->settings['compress']) {
                        $this->settings['compress'] = MEMCACHE_COMPRESSED;
                }
                if (!is_array($this->settings['servers'])) {
                        $this->settings['servers'] = array($this->settings['servers']);
                }
                if (!isset($this->__Memcache)) {
                        $return = false;
                        $this->__Memcache =& new Memcache();
                        foreach ($this->settings['servers'] as $server) {
                                $parts = explode(':', $server);
                                $host = $parts[0];
                                $port = 11211;
                                if (isset($parts[1])) {
                                        $port = $parts[1];
                                }
                                if ($this->__Memcache->addServer($host, $port)) {
                                        $return = true;
                                }
                        }
                        return $return;
                }
                return true;
        }
/**
 * Write data for key into cache
 *
 * @param string $key Identifier for the data
 * @param mixed $value Data to be cached
 * @param integer $duration How long to cache the data, in seconds
 * @return boolean True if the data was succesfully cached, false on failure
 * @access public
 */
        function write($key, &$value, $duration) {
                $expires = time() + $duration;
                $this->__Memcache->set($key.'_expires', $expires, $this->settings['compress'], $duration);
                return $this->__Memcache->set($key, $value, $this->settings['compress'], $duration);
        }
/**
 * Read a key from the cache
 *
 * @param string $key Identifier for the data
 * @return mixed The cached data, or false if the data doesn't exist, has expired, or if there was an error fetching it
 * @access public
 */
        function read($key) {
                $time = time();
                $cachetime = intval($this->__Memcache->get($key.'_expires'));
                if ($cachetime < $time || ($time + $this->settings['duration']) < $cachetime) {
                        return false;
                }
                return $this->__Memcache->get($key);
        }
/**
 * Delete a key from the cache
 *
 * @param string $key Identifier for the data
 * @return boolean True if the value was succesfully deleted, false if it didn't exist or couldn't be removed
 * @access public
 */
        function delete($key) {
                return $this->__Memcache->delete($key);
        }
/**
 * Delete all keys from the cache
 *
 * @return boolean True if the cache was succesfully cleared, false otherwise
 * @access public
 */
        function clear() {
                return $this->__Memcache->flush();
        }
/**
 * Connects to a server in connection pool
 *
 * @param string $host host ip address or name
 * @param integer $port Server port
 * @return boolean True if memcache server was connected
 * @access public
 */
        function connect($host, $port = 11211) {
                if ($this->__Memcache->getServerStatus($host, $port) === 0) {
                        if ($this->__Memcache->connect($host, $port)) {
                                return true;
                        }
                        return false;
                }
                return true;
        }
}
?>