<?php
/**
 * ShopEx licence
 *
 * @copyright  Copyright (c) 2005-2010 ShopEx Technologies Inc. (http://www.shopex.cn)
 * @license  http://ecos.shopex.cn/ ShopEx License
 */
 

/*
 * @package base
 * @copyright Copyright (c) 2010, shopex. inc
 * @author edwin.lzh@gmail.com
 * @license 
 */
class base_cache_memcache extends base_cache_abstract implements base_interface_cache
{
    static private $_cacheObj = null;

    function __construct() 
    {
        $this->connect();
        $this->check_vary_list();
    }//End Function

    public function connect() 
    {
        if(!isset(self::$_cacheObj)){
            if(defined('CACHE_MEMCACHE_CONFIG') && constant('CACHE_MEMCACHE_CONFIG')){
                self::$_cacheObj = new Memcache;
                $config = explode(',', CACHE_MEMCACHE_CONFIG);
                foreach($config AS $row){
                    $row = trim($row);
                    if(strpos($row, 'unix://') === 0){
                        self::$_cacheObj->addServer($row, 0);
                    }else{
                        $tmp = explode(':', $row);
                        self::$_cacheObj->addServer($tmp[0], $tmp[1]);
                    }
                }
            }else{
                trigger_error('can\'t load CACHE_MEMCACHE_CONFIG, please check it', E_USER_ERROR);
            }
        }
    }//End Function

    public function fetch($key, &$result) 
    {
        $result = self::$_cacheObj->get($key);
        if($result === false){
            return false;
        }else{
            return true;
        }
    }//End Function

    public function store($key, $value) 
    {
        return self::$_cacheObj->set($key, $value, MEMCACHE_COMPRESSED, 0);
    }//End Function

    public function status() 
    {
        $status = self::$_cacheObj->getStats();
        $return['缓存获取'] = $status['cmd_get'];
        $return['缓存存储'] = $status['cmd_set'];
        $return['可使用缓存'] = $status['limit_maxbytes'];
        return $return;
    }//End Function
    
}//End Class
