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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 - 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')); } }
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