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<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.1.6 or newer
 *
 * @package             CodeIgniter
 * @author              ExpressionEngine Dev Team
 * @copyright   Copyright (c) 2006 - 2012 EllisLab, Inc.
 * @license             http://codeigniter.com/user_guide/license.html
 * @link                http://codeigniter.com
 * @since               Version 2.0
 * @filesource  
 */

// ------------------------------------------------------------------------

/**
 * CodeIgniter APC Caching Class 
 *
 * @package             CodeIgniter
 * @subpackage  Libraries
 * @category    Core
 * @author              ExpressionEngine Dev Team
 * @link                
 */

class CI_Cache_apc extends CI_Driver {

        /**
         * 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)
        {
                $data = apc_fetch($id);

                return (is_array($data)) ? $data[0] : FALSE;
        }

        // ------------------------------------------------------------------------     
        
        /**
         * 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, $ttl = 60)
        {
                return apc_store($id, array($data, time(), $ttl), $ttl);
        }
        
        // ------------------------------------------------------------------------

        /**
         * Delete from Cache
         *
         * @param       mixed           unique identifier of the item in the cache
         * @param       boolean         true on success/false on failure
         */
        public function delete($id)
        {
                return apc_delete($id);
        }

        // ------------------------------------------------------------------------

        /**
         * Clean the cache
         *
         * @return      boolean         false on failure/true on success
         */
        public function clean()
        {
                return apc_clear_cache('user');
        }

        // ------------------------------------------------------------------------

        /**
         * Cache Info
         *
         * @param       string          user/filehits
         * @return      mixed           array on success, false on failure      
         */
         public function cache_info($type = NULL)
         {
                 return apc_cache_info($type);
         }

        // ------------------------------------------------------------------------

        /**
         * Get Cache Metadata
         *
         * @param       mixed           key to get cache metadata on
         * @return      mixed           array on success/false on failure
         */
        public function get_metadata($id)
        {
                $stored = apc_fetch($id);

                if (count($stored) !== 3)
                {
                        return FALSE;
                }

                list($data, $time, $ttl) = $stored;

                return array(
                        'expire'        => $time + $ttl,
                        'mtime'         => $time,
                        'data'          => $data
                );
        }

        // ------------------------------------------------------------------------

        /**
         * is_supported()
         *
         * Check to see if APC is available on this system, bail if it isn't.
         */
        public function is_supported()
        {
                if ( ! extension_loaded('apc') OR ini_get('apc.enabled') != "1")
                {
                        log_message('error', 'The APC PHP extension must be loaded to use APC Cache.');
                        return FALSE;
                }
                
                return TRUE;
        }

        // ------------------------------------------------------------------------

        
}
// End Class

/* End of file Cache_apc.php */
/* Location: ./system/libraries/Cache/drivers/Cache_apc.php */