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<?php defined('SYSPATH') OR die('No direct access allowed.');
/**
* Xcache Cache driver.
*
* $Id: Xcache.php 4046 2009-03-05 19:23:29Z Shadowhand $
*
* @package Cache
* @author Kohana Team
* @copyright (c) 2007-2008 Kohana Team
* @license http://kohanaphp.com/license.html
*/
class Cache_Xcache_Driver implements Cache_Driver {
public function __construct()
{
if ( ! extension_loaded('xcache'))
throw new Kohana_Exception('cache.extension_not_loaded', 'xcache');
}
public function get($id)
{
if (xcache_isset($id))
return xcache_get($id);
return NULL;
}
public function set($id, $data, array $tags = NULL, $lifetime)
{
if ( ! empty($tags))
{
Kohana::log('error', 'Cache: tags are unsupported by the Xcache driver');
}
return xcache_set($id, $data, $lifetime);
}
public function find($tag)
{
Kohana::log('error', 'Cache: tags are unsupported by the Xcache driver');
return FALSE;
}
public function delete($id, $tag = FALSE)
{
if ($tag !== FALSE)
{
Kohana::log('error', 'Cache: tags are unsupported by the Xcache driver');
return TRUE;
}
elseif ($id !== TRUE)
{
if (xcache_isset($id))
return xcache_unset($id);
return FALSE;
}
else
{
// Do the login
$this->auth();
$result = TRUE;
for ($i = 0, $max = xcache_count(XC_TYPE_VAR); $i < $max; $i++)
{
if (xcache_clear_cache(XC_TYPE_VAR, $i) !== NULL)
{
$result = FALSE;
break;
}
}
// Undo the login
$this->auth(TRUE);
return $result;
}
return TRUE;
}
public function delete_expired()
{
return TRUE;
}
private function auth($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
{
$value = getenv($key);
if ( ! empty($value))
{
$backup[$key] = $value;
}
$_SERVER[$key] = Kohana::config('cache_xcache.'.$key);
}
}
}
} // End Cache Xcache Driver
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