Subversion-Projekte lars-tiefland.cakephp

<?php
/* SVN FILE: $Id: xcache.php 8004 2009-01-16 20:15:21Z gwoo $ */
/**
 * Xcache 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 1.2.0.4947
 * @version       $Revision: 8004 $
 * @modifiedby    $LastChangedBy: gwoo $
 * @lastmodified  $Date: 2009-01-16 12:15:21 -0800 (Fri, 16 Jan 2009) $
 * @license       http://www.opensource.org/licenses/mit-license.php The MIT License
 */
/**
 * Xcache storage engine for cache
 *
 * @link          http://trac.lighttpd.net/xcache/ Xcache
 * @package       cake
 * @subpackage    cake.cake.libs.cache
 */
class XcacheEngine extends CacheEngine {
/**
 * settings
 *              PHP_AUTH_USER = xcache.admin.user, default cake
 *              PHP_AUTH_PW = xcache.admin.password, default cake
 *
 * @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) {
                parent::init(array_merge(array(
                        'engine' => 'Xcache', 'prefix' => Inflector::slug(APP_DIR) . '_', 'PHP_AUTH_USER' => 'user', 'PHP_AUTH_PW' => 'password'
                        ), $settings)
                );
                return function_exists('xcache_info');
        }
/**
 * 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() + $duration;
                xcache_set($key.'_expires', $expires, $duration);
                return xcache_set($key, $value, $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) {
                if (xcache_isset($key)) {
                        $time = time();
                        $cachetime = intval(xcache_get($key.'_expires'));
                        if ($cachetime < $time || ($time + $this->settings['duration']) < $cachetime) {
                                return false;
                        }
                        return xcache_get($key);
                }
                return false;
        }
/**
 * 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 xcache_unset($key);
        }
/**
 * Delete all keys from the cache
 *
 * @return boolean True if the cache was succesfully cleared, false otherwise
 * @access public
 */
        function clear() {
                $this->__auth();
                for ($i = 0, $max = xcache_count(XC_TYPE_VAR); $i < $max; $i++) {
                        xcache_clear_cache(XC_TYPE_VAR, $i);
                }
                $this->__auth(true);
                return xcache_count(XC_TYPE_VAR) == 0;
        }
/**
 * Populates and reverses $_SERVER authentication values
 * Makes necessary changes (and reverting them back) in $_SERVER
 *
 * This has to be done because xcache_clear_cache() needs to pass Basic Http Auth
 * (see xcache.admin configuration settings)
 *
 * @param boolean Revert changes
 * @access private
 */
        function __auth($reverse = false) {
                static $backup = array();
                $keys = array('PHP_AUTH_USER' => 'user', 'PHP_AUTH_PW' => 'password');
                foreach ($keys as $key => $setting) {
                        if ($reverse) {
                                if (isset($backup[$key])) {
                                        $_SERVER[$key] = $backup[$key];
                                        unset($backup[$key]);
                                } else {
                                        unset($_SERVER[$key]);
                                }
                        } else {
                                $value = env($key);
                                if (!empty($value)) {
                                        $backup[$key] = $value;
                                }
                                if (!empty($this->settings[$setting])) {
                                        $_SERVER[$key] = $this->settings[$setting];
                                } else if (!empty($this->settings[$key])) {
                                        $_SERVER[$key] = $this->settings[$key];
                                } else {
                                        $_SERVER[$key] = $value;
                                }
                        }
                }
        }
}
?>