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 - 2016, 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 - 2016, 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'));
        }
}