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<?php defined('SYSPATH') OR die('No direct access allowed.');
/**
* XCache-based Cache driver.
*
* $Id: Memcache.php 4605 2009-09-14 17:22:21Z kiall $
*
* @package Cache
* @author Kohana Team
* @copyright (c) 2007-2009 Kohana Team
* @license http://kohanaphp.com/license
* @TODO Check if XCache cleans its own keys.
*/
class Cache_Xcache_Driver extends Cache_Driver {
protected $config;
public function __construct($config)
{
if ( ! extension_loaded('xcache'))
throw new Kohana_Exception('The xcache PHP extension must be loaded to use this driver.');
$this->config = $config;
}
public function set($items, $tags = NULL, $lifetime = NULL)
{
if ($tags !== NULL)
{
Kohana_Log::add('debug', __('Cache: XCache driver does not support tags'));
}
foreach ($items as $key => $value)
{
if (is_resource($value))
throw new Cache_Exception('Caching of resources is impossible, because resources cannot be serialised.');
if ( ! xcache_set($key, $value, $lifetime))
{
return FALSE;
}
}
return TRUE;
}
public function get($keys, $single = FALSE)
{
$items = array();
foreach ($keys as $key)
{
if (xcache_isset($id))
{
$items[$key] = xcache_get($id);
}
else
{
$items[$key] = NULL;
}
}
if ($single)
{
return ($items === FALSE OR count($items) > 0) ? current($items) : NULL;
}
else
{
return ($items === FALSE) ? array() : $items;
}
}
/**
* Get cache items by tag
*/
public function get_tag($tags)
{
Kohana_Log::add('debug', __('Cache: XCache driver does not support tags'));
return NULL;
}
/**
* Delete cache item by key
*/
public function delete($keys)
{
foreach ($keys as $key)
{
if ( ! xcache_unset($key))
{
return FALSE;
}
}
return TRUE;
}
/**
* Delete cache items by tag
*/
public function delete_tag($tags)
{
Kohana_Log::add('debug', __('Cache: XCache driver does not support tags'));
return NULL;
}
/**
* Empty the cache
*/
public function delete_all()
{
$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 $result;
}
private function auth($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] = $this->config->{$key};
}
}
}
} // End Cache XCache Driver
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