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 - 2018, 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 - 2018, British Columbia Institute of Technology (http://bcit.ca/)
 * @license     http://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'));
        }
}