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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 Memcached Caching Class
*
* @package CodeIgniter
* @subpackage Libraries
* @category Core
* @author ExpressionEngine Dev Team
* @link
*/
class CI_Cache_file extends CI_Driver {
protected $_cache_path;
/**
* Constructor
*/
public function __construct()
{
$CI =& get_instance();
$CI->load->helper('file');
$path = $CI->config->item('cache_path');
$this->_cache_path = ($path == '') ? APPPATH.'cache/' : $path;
}
// ------------------------------------------------------------------------
/**
* Fetch from cache
*
* @param mixed unique key id
* @return mixed data on success/false on failure
*/
public function get($id)
{
if ( ! file_exists($this->_cache_path.$id))
{
return FALSE;
}
$data = read_file($this->_cache_path.$id);
$data = unserialize($data);
if (time() > $data['time'] + $data['ttl'])
{
unlink($this->_cache_path.$id);
return FALSE;
}
return $data['data'];
}
// ------------------------------------------------------------------------
/**
* Save into cache
*
* @param string unique key
* @param mixed data to store
* @param int length of time (in seconds) the cache is valid
* - Default is 60 seconds
* @return boolean true on success/false on failure
*/
public function save($id, $data, $ttl = 60)
{
$contents = array(
'time' => time(),
'ttl' => $ttl,
'data' => $data
);
if (write_file($this->_cache_path.$id, serialize($contents)))
{
@chmod($this->_cache_path.$id, 0777);
return TRUE;
}
return FALSE;
}
// ------------------------------------------------------------------------
/**
* Delete from Cache
*
* @param mixed unique identifier of item in cache
* @return boolean true on success/false on failure
*/
public function delete($id)
{
return unlink($this->_cache_path.$id);
}
// ------------------------------------------------------------------------
/**
* Clean the Cache
*
* @return boolean false on failure/true on success
*/
public function clean()
{
return delete_files($this->_cache_path);
}
// ------------------------------------------------------------------------
/**
* Cache Info
*
* Not supported by file-based caching
*
* @param string user/filehits
* @return mixed FALSE
*/
public function cache_info($type = NULL)
{
return get_dir_file_info($this->_cache_path);
}
// ------------------------------------------------------------------------
/**
* Get Cache Metadata
*
* @param mixed key to get cache metadata on
* @return mixed FALSE on failure, array on success.
*/
public function get_metadata($id)
{
if ( ! file_exists($this->_cache_path.$id))
{
return FALSE;
}
$data = read_file($this->_cache_path.$id);
$data = unserialize($data);
if (is_array($data))
{
$mtime = filemtime($this->_cache_path.$id);
if ( ! isset($data['data']['ttl']))
{
return FALSE;
}
return array(
'expire' => $mtime + $data['data']['ttl'],
'mtime' => $mtime
);
}
return FALSE;
}
// ------------------------------------------------------------------------
/**
* Is supported
*
* In the file driver, check to see that the cache directory is indeed writable
*
* @return boolean
*/
public function is_supported()
{
return is_really_writable($this->_cache_path);
}
// ------------------------------------------------------------------------
}
// End Class
/* End of file Cache_file.php */
/* Location: ./system/libraries/Cache/drivers/Cache_file.php */
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