diff options
Diffstat (limited to 'system/libraries/Cache/Cache.php')
| -rw-r--r-- | system/libraries/Cache/Cache.php | 241 |
1 files changed, 141 insertions, 100 deletions
diff --git a/system/libraries/Cache/Cache.php b/system/libraries/Cache/Cache.php index 673e63de3..267dffb09 100644 --- a/system/libraries/Cache/Cache.php +++ b/system/libraries/Cache/Cache.php @@ -1,19 +1,41 @@ -<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); +<?php /** * CodeIgniter * - * An open source application development framework for PHP 5.1.6 or newer + * An open source application development framework for PHP * - * @package CodeIgniter - * @author ExpressionEngine Dev Team - * @copyright Copyright (c) 2006 - 2014 EllisLab, Inc. - * @license http://codeigniter.com/user_guide/license.html - * @link http://codeigniter.com - * @since Version 2.0 + * This content is released under the MIT License (MIT) + * + * Copyright (c) 2014 - 2017, 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 - 2017, 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 Caching Class @@ -21,31 +43,82 @@ * @package CodeIgniter * @subpackage Libraries * @category Core - * @author ExpressionEngine Dev Team + * @author EllisLab Dev Team * @link */ class CI_Cache extends CI_Driver_Library { - protected $valid_drivers = array( - 'cache_apc', 'cache_file', 'cache_memcached', 'cache_dummy' + /** + * Valid cache drivers + * + * @var array + */ + protected $valid_drivers = array( + 'apc', + 'dummy', + 'file', + 'memcached', + 'redis', + 'wincache' ); - protected $_cache_path = NULL; // Path of cache files (if file-based cache) - protected $_adapter = 'dummy'; - protected $_backup_driver; + /** + * Path of cache files (if file-based cache) + * + * @var string + */ + protected $_cache_path = NULL; - // ------------------------------------------------------------------------ + /** + * Reference to the driver + * + * @var mixed + */ + protected $_adapter = 'dummy'; + + /** + * Fallback driver + * + * @var string + */ + protected $_backup_driver = 'dummy'; + + /** + * Cache key prefix + * + * @var string + */ + public $key_prefix = ''; /** * Constructor * - * @param array + * Initialize class properties based on the configuration array. + * + * @param array $config = array() + * @return void */ public function __construct($config = array()) { - if ( ! empty($config)) + isset($config['adapter']) && $this->_adapter = $config['adapter']; + isset($config['backup']) && $this->_backup_driver = $config['backup']; + isset($config['key_prefix']) && $this->key_prefix = $config['key_prefix']; + + // If the specified adapter isn't available, check the backup. + if ( ! $this->is_supported($this->_adapter)) { - $this->_initialize($config); + if ( ! $this->is_supported($this->_backup_driver)) + { + // Backup isn't supported either. Default to 'Dummy' driver. + log_message('error', 'Cache adapter "'.$this->_adapter.'" and backup "'.$this->_backup_driver.'" are both unavailable. Cache is now using "Dummy" adapter.'); + $this->_adapter = 'dummy'; + } + else + { + // Backup is supported. Set it to primary. + log_message('debug', 'Cache adapter "'.$this->_adapter.'" is unavailable. Falling back to "'.$this->_backup_driver.'" backup adapter.'); + $this->_adapter = $this->_backup_driver; + } } } @@ -54,15 +127,15 @@ class CI_Cache extends CI_Driver_Library { /** * Get * - * Look for a value in the cache. If it exists, return the data + * 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 + * @param string $id + * @return mixed value matching $id or FALSE on failure */ public function get($id) { - return $this->{$this->_adapter}->get($id); + return $this->{$this->_adapter}->get($this->key_prefix.$id); } // ------------------------------------------------------------------------ @@ -70,15 +143,15 @@ class CI_Cache extends CI_Driver_Library { /** * Cache Save * - * @param string Unique Key - * @param mixed Data to store - * @param int Length of time (in seconds) to cache the data - * - * @return boolean true on success/false on failure + * @param string $id Cache ID + * @param mixed $data Data to store + * @param int $ttl Cache TTL (in seconds) + * @param bool $raw Whether to store the raw value + * @return bool TRUE on success, FALSE on failure */ - public function save($id, $data, $ttl = 60) + public function save($id, $data, $ttl = 60, $raw = FALSE) { - return $this->{$this->_adapter}->save($id, $data, $ttl); + return $this->{$this->_adapter}->save($this->key_prefix.$id, $data, $ttl, $raw); } // ------------------------------------------------------------------------ @@ -86,129 +159,97 @@ class CI_Cache extends CI_Driver_Library { /** * Delete from Cache * - * @param mixed unique identifier of the item in the cache - * @return boolean true on success/false on failure + * @param string $id Cache ID + * @return bool TRUE on success, FALSE on failure */ public function delete($id) { - return $this->{$this->_adapter}->delete($id); + return $this->{$this->_adapter}->delete($this->key_prefix.$id); } // ------------------------------------------------------------------------ /** - * Clean the cache + * Increment a raw value * - * @return boolean false on failure/true on success + * @param string $id Cache ID + * @param int $offset Step/value to add + * @return mixed New value on success or FALSE on failure */ - public function clean() + public function increment($id, $offset = 1) { - return $this->{$this->_adapter}->clean(); + return $this->{$this->_adapter}->increment($this->key_prefix.$id, $offset); } // ------------------------------------------------------------------------ /** - * Cache Info + * Decrement a raw value * - * @param string user/filehits - * @return mixed array on success, false on failure + * @param string $id Cache ID + * @param int $offset Step/value to reduce by + * @return mixed New value on success or FALSE on failure */ - public function cache_info($type = 'user') + public function decrement($id, $offset = 1) { - return $this->{$this->_adapter}->cache_info($type); + return $this->{$this->_adapter}->decrement($this->key_prefix.$id, $offset); } // ------------------------------------------------------------------------ /** - * Get Cache Metadata + * Clean the cache * - * @param mixed key to get cache metadata on - * @return mixed return value from child method + * @return bool TRUE on success, FALSE on failure */ - public function get_metadata($id) + public function clean() { - return $this->{$this->_adapter}->get_metadata($id); + return $this->{$this->_adapter}->clean(); } // ------------------------------------------------------------------------ /** - * Initialize - * - * Initialize class properties based on the configuration array. + * Cache Info * - * @param array - * @return void + * @param string $type = 'user' user/filehits + * @return mixed array containing cache info on success OR FALSE on failure */ - private function _initialize($config) + public function cache_info($type = 'user') { - $default_config = array( - 'adapter', - 'memcached' - ); - - foreach ($default_config as $key) - { - if (isset($config[$key])) - { - $param = '_'.$key; - - $this->{$param} = $config[$key]; - } - } - - if (isset($config['backup'])) - { - if (in_array('cache_'.$config['backup'], $this->valid_drivers)) - { - $this->_backup_driver = $config['backup']; - } - } + return $this->{$this->_adapter}->cache_info($type); } // ------------------------------------------------------------------------ /** - * Is the requested driver supported in this environment? + * Get Cache Metadata * - * @param string The driver to test. - * @return array + * @param string $id key to get cache metadata on + * @return mixed cache item metadata */ - public function is_supported($driver) + public function get_metadata($id) { - static $support = array(); - - if ( ! isset($support[$driver])) - { - $support[$driver] = $this->{$driver}->is_supported(); - } - - return $support[$driver]; + return $this->{$this->_adapter}->get_metadata($this->key_prefix.$id); } // ------------------------------------------------------------------------ /** - * __get() + * Is the requested driver supported in this environment? * - * @param child - * @return object + * @param string $driver The driver to test + * @return array */ - public function __get($child) + public function is_supported($driver) { - $obj = parent::__get($child); + static $support; - if ( ! $this->is_supported($child)) + if ( ! isset($support, $support[$driver])) { - $this->_adapter = $this->_backup_driver; + $support[$driver] = $this->{$driver}->is_supported(); } - return $obj; + return $support[$driver]; } - } - -/* End of file Cache.php */ -/* Location: ./system/libraries/Cache/Cache.php */
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