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system/libraries/Cache/Cache.php
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216
system/libraries/Cache/Cache.php
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<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
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/**
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* CodeIgniter
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*
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* An open source application development framework for PHP 4.3.2 or newer
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*
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* @package CodeIgniter
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* @author ExpressionEngine Dev Team
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* @copyright Copyright (c) 2006 - 2012 EllisLab, Inc.
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* @license http://codeigniter.com/user_guide/license.html
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* @link http://codeigniter.com
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* @since Version 2.0
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* @filesource
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*/
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// ------------------------------------------------------------------------
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/**
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* CodeIgniter Caching Class
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*
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* @package CodeIgniter
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* @subpackage Libraries
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* @category Core
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* @author ExpressionEngine Dev Team
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* @link
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*/
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class CI_Cache extends CI_Driver_Library {
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protected $valid_drivers = array(
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'cache_apc', 'cache_file', 'cache_memcached', 'cache_dummy'
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);
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protected $_cache_path = NULL; // Path of cache files (if file-based cache)
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protected $_adapter = 'dummy';
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protected $_backup_driver;
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// ------------------------------------------------------------------------
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/**
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* Constructor
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*
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* @param array
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*/
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public function __construct($config = array())
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{
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if ( ! empty($config))
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{
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$this->_initialize($config);
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}
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}
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// ------------------------------------------------------------------------
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/**
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* Get
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*
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* Look for a value in the cache. If it exists, return the data
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* if not, return FALSE
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*
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* @param string
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* @return mixed value that is stored/FALSE on failure
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*/
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public function get($id)
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{
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return $this->{$this->_adapter}->get($id);
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}
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// ------------------------------------------------------------------------
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/**
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* Cache Save
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*
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* @param string Unique Key
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* @param mixed Data to store
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* @param int Length of time (in seconds) to cache the data
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*
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* @return boolean true on success/false on failure
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*/
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public function save($id, $data, $ttl = 60)
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{
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return $this->{$this->_adapter}->save($id, $data, $ttl);
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}
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// ------------------------------------------------------------------------
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/**
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* Delete from Cache
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*
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* @param mixed unique identifier of the item in the cache
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* @return boolean true on success/false on failure
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*/
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public function delete($id)
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{
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return $this->{$this->_adapter}->delete($id);
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}
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// ------------------------------------------------------------------------
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/**
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* Clean the cache
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*
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* @return boolean false on failure/true on success
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*/
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public function clean()
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{
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return $this->{$this->_adapter}->clean();
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}
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// ------------------------------------------------------------------------
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/**
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* Cache Info
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*
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* @param string user/filehits
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* @return mixed array on success, false on failure
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*/
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public function cache_info($type = 'user')
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{
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return $this->{$this->_adapter}->cache_info($type);
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}
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// ------------------------------------------------------------------------
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/**
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* Get Cache Metadata
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*
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* @param mixed key to get cache metadata on
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* @return mixed return value from child method
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*/
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public function get_metadata($id)
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{
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return $this->{$this->_adapter}->get_metadata($id);
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}
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// ------------------------------------------------------------------------
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/**
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* Initialize
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*
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* Initialize class properties based on the configuration array.
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*
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* @param array
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* @return void
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*/
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private function _initialize($config)
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{
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$default_config = array(
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'adapter',
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'memcached'
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);
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foreach ($default_config as $key)
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{
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if (isset($config[$key]))
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{
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$param = '_'.$key;
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$this->{$param} = $config[$key];
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}
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}
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if (isset($config['backup']))
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{
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if (in_array('cache_'.$config['backup'], $this->valid_drivers))
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{
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$this->_backup_driver = $config['backup'];
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}
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}
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}
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// ------------------------------------------------------------------------
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/**
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* Is the requested driver supported in this environment?
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*
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* @param string The driver to test.
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* @return array
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*/
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public function is_supported($driver)
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{
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static $support = array();
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if ( ! isset($support[$driver]))
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{
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$support[$driver] = $this->{$driver}->is_supported();
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}
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return $support[$driver];
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}
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// ------------------------------------------------------------------------
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/**
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* __get()
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*
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* @param child
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* @return object
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*/
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public function __get($child)
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{
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$obj = parent::__get($child);
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if ( ! $this->is_supported($child))
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{
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$this->_adapter = $this->_backup_driver;
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}
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return $obj;
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}
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// ------------------------------------------------------------------------
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}
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// End Class
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/* End of file Cache.php */
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/* Location: ./system/libraries/Cache/Cache.php */
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