<?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 Memcached 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_memcached extends CI_Driver {
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private $_memcached; // Holds the memcached object
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protected $_memcache_conf = array(
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'default' => array(
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'default_host' => '127.0.0.1',
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'default_port' => 11211,
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'default_weight' => 1
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)
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);
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// ------------------------------------------------------------------------
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/**
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* Fetch from cache
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*
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* @param mixed unique key id
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* @return mixed data on success/false on failure
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*/
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public function get($id)
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{
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$data = $this->_memcached->get($id);
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return (is_array($data)) ? $data[0] : FALSE;
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}
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// ------------------------------------------------------------------------
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/**
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* Save
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*
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* @param string unique identifier
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* @param mixed data being cached
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* @param int time to live
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* @return boolean true on success, false on failure
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*/
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public function save($id, $data, $ttl = 60)
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{
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if (get_class($this->_memcached) == 'Memcached')
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{
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return $this->_memcached->set($id, array($data, time(), $ttl), $ttl);
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}
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else if (get_class($this->_memcached) == 'Memcache')
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{
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return $this->_memcached->set($id, array($data, time(), $ttl), 0, $ttl);
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}
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return FALSE;
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}
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// ------------------------------------------------------------------------
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/**
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* Delete from Cache
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*
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* @param mixed key to be deleted.
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* @return boolean true on success, false on failure
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*/
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public function delete($id)
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{
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return $this->_memcached->delete($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 $this->_memcached->flush();
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}
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// ------------------------------------------------------------------------
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/**
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* Cache Info
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*
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* @param null type not supported in memcached
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* @return mixed array on success, false on failure
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*/
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public function cache_info($type = NULL)
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{
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return $this->_memcached->getStats();
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}
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// ------------------------------------------------------------------------
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/**
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* Get Cache Metadata
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*
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* @param mixed key to get cache metadata on
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* @return mixed FALSE on failure, array on success.
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*/
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public function get_metadata($id)
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{
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$stored = $this->_memcached->get($id);
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if (count($stored) !== 3)
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{
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return FALSE;
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}
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list($data, $time, $ttl) = $stored;
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return array(
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'expire' => $time + $ttl,
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'mtime' => $time,
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'data' => $data
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);
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}
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// ------------------------------------------------------------------------
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/**
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* Setup memcached.
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*/
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private function _setup_memcached()
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{
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// Try to load memcached server info from the config file.
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$CI =& get_instance();
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if ($CI->config->load('memcached', TRUE, TRUE))
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{
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if (is_array($CI->config->config['memcached']))
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{
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$this->_memcache_conf = NULL;
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foreach ($CI->config->config['memcached'] as $name => $conf)
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{
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$this->_memcache_conf[$name] = $conf;
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}
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}
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}
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$this->_memcached = new Memcached();
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foreach ($this->_memcache_conf as $name => $cache_server)
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{
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if ( ! array_key_exists('hostname', $cache_server))
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{
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$cache_server['hostname'] = $this->_default_options['default_host'];
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}
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if ( ! array_key_exists('port', $cache_server))
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{
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$cache_server['port'] = $this->_default_options['default_port'];
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}
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if ( ! array_key_exists('weight', $cache_server))
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{
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$cache_server['weight'] = $this->_default_options['default_weight'];
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}
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$this->_memcached->addServer(
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$cache_server['hostname'], $cache_server['port'], $cache_server['weight']
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);
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}
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}
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// ------------------------------------------------------------------------
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/**
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* Is supported
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*
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* Returns FALSE if memcached is not supported on the system.
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* If it is, we setup the memcached object & return TRUE
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*/
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public function is_supported()
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{
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if ( ! extension_loaded('memcached'))
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{
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log_message('error', 'The Memcached Extension must be loaded to use Memcached Cache.');
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return FALSE;
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}
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$this->_setup_memcached();
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return TRUE;
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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_memcached.php */
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/* Location: ./system/libraries/Cache/drivers/Cache_memcached.php */
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