Subversion-Projekte lars-tiefland.ci

<?php

/**

 * CodeIgniter

 *

 * An open source application development framework for PHP

 *

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

 *

 * Copyright (c) 2014 - 2019, 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 - 2019, British Columbia Institute of Technology (https://bcit.ca/)

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

 * @link	https://codeigniter.com

 * @since	Version 2.0.0

 * @filesource

 */

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

/**

 * CodeIgniter APC Caching Class

 *

 * @package		CodeIgniter

 * @subpackage	Libraries

 * @category	Core

 * @author		EllisLab Dev Team

 * @link

 */

class CI_Cache_apc 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 APC; extension not loaded/enabled?');

		}

	}

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

	/**

	 * 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)

	{

		$success = FALSE;

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

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

	}

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

	/**

	 * Cache Save

	 *

	 * @param	string	$id	Cache ID

	 * @param	mixed	$data	Data to store

	 * @param	int	$ttl	Length of time (in seconds) to cache the data

	 * @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 apc_store($id, $data, (int) $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 apc_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)

	{

		return apc_inc($id, $offset);

	}

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

	/**

	 * 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)

	{

		return apc_dec($id, $offset);

	}

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

	/**

	 * Clean the cache

	 *

	 * @return	bool	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)

	{

		$cache_info = apc_cache_info('user', FALSE);

		if (empty($cache_info) OR empty($cache_info['cache_list']))

		{

			return FALSE;

		}

		foreach ($cache_info['cache_list'] as &$entry)

		{

			if ($entry['info'] !== $id)

			{

				continue;

			}

			$success  = FALSE;

			$metadata = array(

				'expire' => ($entry['ttl'] ? $entry['mtime'] + $entry['ttl'] : 0),

				'mtime'  => $entry['ttl'],

				'data'   => apc_fetch($id, $success)

			);

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

		}

		return FALSE;

	}

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

	/**

	 * is_supported()

	 *

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

	 *

	 * @return	bool

	 */

	public function is_supported()

	{

		return (extension_loaded('apc') && ini_get('apc.enabled'));

	}

}