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<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
* CodeIgniter
*
* An open source application development framework for PHP 4.3.2 or newer
*
* @package CodeIgniter
* @author ExpressionEngine Dev Team
* @copyright Copyright (c) 2006 - 2011 EllisLab, Inc.
* @license http://codeigniter.com/user_guide/license.html
* @link http://codeigniter.com
* @since Version 2.0
* @filesource
*/
// ------------------------------------------------------------------------
/**
* CodeIgniter Caching Class
*
* @package CodeIgniter
* @subpackage Libraries
* @category Core
* @author ExpressionEngine Dev Team
* @link
*/
class Cache extends CI_Driver_Library {
protected $valid_drivers = array(
'cache_apc', 'cache_file', 'cache_memcached', 'cache_dummy'
);
protected $_cache_path = NULL; // Path of cache files (if file-based cache)
protected $_adapter = 'dummy';
protected $_backup_driver;
// ------------------------------------------------------------------------
/**
* Constructor
*
* @param array
*/
public function __construct($config = array())
{
if ( ! empty($config))
{
$this->_initialize($config);
}
}
// ------------------------------------------------------------------------
/**
* Get
*
* Look for a value in the cache. If it exists, return the data
* if not, return FALSE
*
* @param string
* @return mixed value that is stored/FALSE on failure
*/
public function get($id)
{
return $this->{$this->_adapter}->get($id);
}
// ------------------------------------------------------------------------
/**
* Cache Save
*
* @param string Unique Key
* @param mixed Data to store
* @param int Length of time (in seconds) to cache the data
*
* @return boolean true on success/false on failure
*/
public function save($id, $data, $ttl = 60)
{
return $this->{$this->_adapter}->save($id, $data, $ttl);
}
// ------------------------------------------------------------------------
/**
* Delete from Cache
*
* @param mixed unique identifier of the item in the cache
* @return boolean true on success/false on failure
*/
public function delete($id)
{
return $this->{$this->_adapter}->delete($id);
}
// ------------------------------------------------------------------------
/**
* Clean the cache
*
* @return boolean false on failure/true on success
*/
public function clean()
{
return $this->{$this->_adapter}->clean();
}
// ------------------------------------------------------------------------
/**
* Cache Info
*
* @param string user/filehits
* @return mixed array on success, false on failure
*/
public function cache_info($type = 'user')
{
return $this->{$this->_adapter}->cache_info($type);
}
// ------------------------------------------------------------------------
/**
* Get Cache Metadata
*
* @param mixed key to get cache metadata on
* @return mixed return value from child method
*/
public function get_metadata($id)
{
return $this->{$this->_adapter}->get_metadata($id);
}
// ------------------------------------------------------------------------
/**
* Initialize
*
* Initialize class properties based on the configuration array.
*
* @param array
* @return void
*/
private function _initialize($config)
{
$default_config = array(
'adapter',
'memcached'
);
foreach ($default_config as $key)
{
if (isset($config[$key]))
{
$param = '_'.$key;
$this->{$param} = $config[$key];
}
}
if (isset($config['backup']))
{
if (in_array('cache_'.$config['backup'], $this->valid_drivers))
{
$this->_backup_driver = $config['backup'];
}
}
}
// ------------------------------------------------------------------------
/**
* Is the requested driver supported in this environment?
*
* @param string The driver to test.
* @return array
*/
public function is_supported($driver)
{
static $support = array();
if ( ! isset($support[$driver]))
{
$support[$driver] = $this->{$driver}->is_supported();
}
return $support[$driver];
}
// ------------------------------------------------------------------------
/**
* __get()
*
* @param child
* @return object
*/
public function __get($child)
{
$obj = parent::__get($child);
if ( ! $this->is_supported($child))
{
$this->_adapter = $this->_backup_driver;
}
return $obj;
}
// ------------------------------------------------------------------------
}
// End Class
/* End of file Cache.php */
/* Location: ./system/libraries/Cache/Cache.php */
|
