kohana make session use memcache

杨叔叔

　　Kohana中已经实现Session驱动cookie、native、database，我们再实现基于memcached的驱动：
配置文件session.php:

    <?php defined('SYSPATH') or die('No direct script access.');
return array(
'cache' => array(
'name' => 'cookie_name',
'lifetime' => 43200,
'group' => 'memcache',
),
'native' => array(
'name' => 'session_name',
'lifetime' => 43200,
),
'cookie' => array(
'name' => 'cookie_name',
'encrypted' => TRUE,
'lifetime' => 43200,
),
'database' => array(
'name' => 'cookie_name',
'encrypted' => TRUE,
'lifetime' => 43200,
'group' => 'default',
'table' => 'sessions',
'columns' => array(
'session_id'  => 'session_id',
'last_active' => 'last_active',
'contents'    => 'contents'
),
'gc' => 500,
),
);
　　新增文件
\classes\session\cache.php:

    <?php defined('SYSPATH') or die('No direct script access.');
class Session_Cache extends Kohana_Session_Cache {}
新增文件
\classes\kohana\session\cache.php:
<?php defined('SYSPATH') or die('No direct script access.');
class Kohana_Session_Cache extends Session {
// _memcached instance
protected $_memcached;
// The current session id
protected $_session_id;
// The old session id
protected $_update_id;
public function __construct(array $config = null, $id = NULL) {
if (!isset($config['group'])) {
$config['group'] = 'memcache';
}
$this->_db = Cache::instance($config['group']);
parent::__construct($config, $id);
}
public function id() {
return $this->_session_id;
}
protected function _read($id = NULL) {
if (!is_null($id) OR $id = Cookie::get($this->_name)) {
$ret = $this->_db->get($id);
if (false !== $ret) {
$this->_session_id = $this->_update_id = $id;
return $ret;
}
}
$this->_regenerate();
return NULL;
}
protected function _regenerate() {
do {
$id = str_replace('.', '', uniqid(NULL, TRUE));
$ret = $this->_db->get($id);
} while (!is_null($ret));
return $this->_session_id = $id;
}
protected function _write() {
$this->_db->set($this->_session_id, $this->__toString(), $this->_lifetime);
$this->_update_id = $this->_session_id;
Cookie::set($this->_name, $this->_session_id, $this->_lifetime);
return TRUE;
}
/**
* @return  bool
*/
protected function _restart() {
$this->_regenerate();
return TRUE;
}
protected function _destroy() {
$ret = $this->_db->delete($this->_update_id);
return $ret;
}
}
// End Session_Cache