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<?php

/**

 * CodeIgniter

 *

 * An open source application development framework for PHP

 *

 * This content is released under the MIT License (MIT)

 *

 * Copyright (c) 2014 - 2017, British Columbia Institute of Technology

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 *

 * @package	CodeIgniter

 * @author	EllisLab Dev Team

 * @copyright	Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)

 * @copyright	Copyright (c) 2014 - 2017, British Columbia Institute of Technology (http://bcit.ca/)

 * @license	http://opensource.org/licenses/MIT	MIT License

 * @link	https://codeigniter.com

 * @since	Version 3.0.0

 * @filesource

 */

defined('BASEPATH') OR exit('No direct script access allowed');

/**

 * CodeIgniter Wincache Caching Class

 *

 * Read more about Wincache functions here:

 * http://www.php.net/manual/en/ref.wincache.php

 *

 * @package		CodeIgniter

 * @subpackage	Libraries

 * @category	Core

 * @author		Mike Murkovic

 * @link

 */

class CI_Cache_wincache extends CI_Driver {

	/**

	 * Class constructor

	 *

	 * Only present so that an error message is logged

	 * if APC is not available.

	 *

	 * @return	void

	 */

	public function __construct()

	{

		if ( ! $this->is_supported())

		{

			log_message('error', 'Cache: Failed to initialize Wincache; extension not loaded/enabled?');

		}

	}

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

	/**

	 * Get

	 *

	 * Look for a value in the cache. If it exists, return the data,

	 * if not, return FALSE

	 *

	 * @param	string	$id	Cache Ide

	 * @return	mixed	Value that is stored/FALSE on failure

	 */

	public function get($id)

	{

		$success = FALSE;

		$data = wincache_ucache_get($id, $success);

		// Success returned by reference from wincache_ucache_get()

		return ($success) ? $data : FALSE;

	}

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

	/**

	 * Cache Save

	 *

	 * @param	string	$id	Cache ID

	 * @param	mixed	$data	Data to store

	 * @param	int	$ttl	Time to live (in seconds)

	 * @param	bool	$raw	Whether to store the raw value (unused)

	 * @return	bool	true on success/false on failure

	 */

	public function save($id, $data, $ttl = 60, $raw = FALSE)

	{

		return wincache_ucache_set($id, $data, $ttl);

	}

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

	/**

	 * Delete from Cache

	 *

	 * @param	mixed	unique identifier of the item in the cache

	 * @return	bool	true on success/false on failure

	 */

	public function delete($id)

	{

		return wincache_ucache_delete($id);

	}

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

	/**

	 * Increment a raw value

	 *

	 * @param	string	$id	Cache ID

	 * @param	int	$offset	Step/value to add

	 * @return	mixed	New value on success or FALSE on failure

	 */

	public function increment($id, $offset = 1)

	{

		$success = FALSE;

		$value = wincache_ucache_inc($id, $offset, $success);

		return ($success === TRUE) ? $value : FALSE;

	}

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

	/**

	 * Decrement a raw value

	 *

	 * @param	string	$id	Cache ID

	 * @param	int	$offset	Step/value to reduce by

	 * @return	mixed	New value on success or FALSE on failure

	 */

	public function decrement($id, $offset = 1)

	{

		$success = FALSE;

		$value = wincache_ucache_dec($id, $offset, $success);

		return ($success === TRUE) ? $value : FALSE;

	}

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

	/**

	 * Clean the cache

	 *

	 * @return	bool	false on failure/true on success

	 */

	public function clean()

	{

		return wincache_ucache_clear();

	}

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

	/**

	 * Cache Info

	 *

	 * @return	mixed	array on success, false on failure

	 */

	 public function cache_info()

	 {

		 return wincache_ucache_info(TRUE);

	 }

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

	/**

	 * Get Cache Metadata

	 *

	 * @param	mixed	key to get cache metadata on

	 * @return	mixed	array on success/false on failure

	 */

	public function get_metadata($id)

	{

		if ($stored = wincache_ucache_info(FALSE, $id))

		{

			$age = $stored['ucache_entries'][1]['age_seconds'];

			$ttl = $stored['ucache_entries'][1]['ttl_seconds'];

			$hitcount = $stored['ucache_entries'][1]['hitcount'];

			return array(

				'expire'	=> $ttl - $age,

				'hitcount'	=> $hitcount,

				'age'		=> $age,

				'ttl'		=> $ttl

			);

		}

		return FALSE;

	}

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

	/**

	 * is_supported()

	 *

	 * Check to see if WinCache is available on this system, bail if it isn't.

	 *

	 * @return	bool

	 */

	public function is_supported()

	{

		return (extension_loaded('wincache') && ini_get('wincache.ucenabled'));

	}

}