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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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