<?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 */

