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<?php
/* SVN FILE: $Id: xcache.php 7118 2008-06-04 20:49:29Z 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: 7118 $
* @modifiedby $LastChangedBy: gwoo $
* @lastmodified $Date: 2008-06-04 13:49:29 -0700 (Wed, 04 Jun 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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