diff options
Diffstat (limited to 'system/libraries/Cache/drivers/Cache_file.php')
| -rw-r--r-- | system/libraries/Cache/drivers/Cache_file.php | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/system/libraries/Cache/drivers/Cache_file.php b/system/libraries/Cache/drivers/Cache_file.php new file mode 100644 index 000000000..bedbfaff8 --- /dev/null +++ b/system/libraries/Cache/drivers/Cache_file.php @@ -0,0 +1,196 @@ +<?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 - 2010 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 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 == '') ? BASEPATH.'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)) + { + $data = $data['data']; + $mtime = filemtime($this->_cache_path.$id); + + if ( ! isset($data['ttl'])) + { + return FALSE; + } + + return array( + 'expire' => $mtime + $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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