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xcache.php

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<?php
/* SVN FILE: $Id: xcache_8php-source.html 580 2008-07-01 14:45:49Z 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.
 *                              1785 E. Sahara Avenue, Suite 490-204
 *                              Las Vegas, Nevada 89104
 *
 * Licensed under The MIT License
 * Redistributions of files must retain the above copyright notice.
 *
 * @filesource
 * @copyright       Copyright 2005-2008, Cake Software Foundation, Inc.
 * @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: 580 $
 * @modifiedby      $LastChangedBy: gwoo $
 * @lastmodified    $Date: 2008-07-01 09:45:49 -0500 (Tue, 01 Jul 2008) $
 * @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, $duration) {
        return xcache_set($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($key)) {
            return xcache_get($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() {
        $result = true;
        $this->__auth();
        for ($i = 0, $max = xcache_count(XC_TYPE_VAR); $i < $max; $i++) {
            if (!xcache_clear_cache(XC_TYPE_VAR, $i)) {
                $result = false;
                break;
            }
        }
        $this->__auth(true);
        return $result;
    }
/**
 * 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();
        $keys = array('PHP_AUTH_USER', 'PHP_AUTH_PW');
        foreach ($keys as $key) {
            if ($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;
                }
                $varName = '__' . $key;
                $_SERVER[$key] = $this->settings[$varName];
            }
        }
    }
}
?>

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