CacheMemcache.class.php

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<?php
/* Copyright (C) NAVER <http://www.navercorp.com> */

class CacheMemcache extends CacheBase
{
    var $Memcache;
    var $SelectedExtension;

    function getInstance($url)
    {
        if(!$GLOBALS['__CacheMemcache__'])
        {
            $GLOBALS['__CacheMemcache__'] = new CacheMemcache($url);
        }
        return $GLOBALS['__CacheMemcache__'];
    }

    function __construct($url)
    {
        //$config['url'] = array('memcache://localhost:11211');
        $config['url'] = is_array($url) ? $url : array($url);
        if(class_exists('Memcached'))
        {
            $this->Memcache = new Memcached;
            $this->SelectedExtension = 'Memcached';
        }
        elseif(class_exists('Memcache'))
        {
            $this->Memcache = new Memcache;
            $this->SelectedExtension = 'Memcache';
        }
        else
        {
            return false;
        }

        foreach($config['url'] as $url)
        {
            $info = parse_url($url);
            $this->Memcache->addServer($info['host'], $info['port']);
        }
    }

    function isSupport()
    {
        if(isset($GLOBALS['XE_MEMCACHE_SUPPORT']))
        {
            return $GLOBALS['XE_MEMCACHE_SUPPORT'];
        }
        if($this->SelectedExtension === 'Memcached')
        {
            return $GLOBALS['XE_MEMCACHE_SUPPORT'] = $this->Memcache->set('xe', 'xe', 1); 
        }
        elseif($this->SelectedExtension === 'Memcache')
        {
            return $GLOBALS['XE_MEMCACHE_SUPPORT'] = $this->Memcache->set('xe', 'xe', MEMCACHE_COMPRESSED, 1); 
        }
        else
        {
            return $GLOBALS['XE_MEMCACHE_SUPPORT'] = false;
        }
    }

    function getKey($key)
    {
        return md5(_XE_PATH_ . $key);
    }

    function put($key, $buff, $valid_time = 0)
    {
        if($valid_time == 0)
        {
            $valid_time = $this->valid_time;
        }
        if($this->SelectedExtension === 'Memcached')
        {
            return $this->Memcache->set($this->getKey($key), array($_SERVER['REQUEST_TIME'], $buff), $valid_time);
        }
        else
        {
            return $this->Memcache->set($this->getKey($key), array($_SERVER['REQUEST_TIME'], $buff), MEMCACHE_COMPRESSED, $valid_time);
        }
    }

    function isValid($key, $modified_time = 0)
    {
        $_key = $this->getKey($key);

        $obj = $this->Memcache->get($_key);
        if(!$obj || !is_array($obj))
        {
            return false;
        }
        unset($obj[1]);

        if($modified_time > 0 && $modified_time > $obj[0])
        {
            $this->_delete($_key);
            return false;
        }

        return true;
    }

    function get($key, $modified_time = 0)
    {
        $_key = $this->getKey($key);
        $obj = $this->Memcache->get($_key);
        if(!$obj || !is_array($obj))
        {
            return false;
        }

        if($modified_time > 0 && $modified_time > $obj[0])
        {
            $this->_delete($_key);
            return false;
        }

        unset($obj[0]);

        return $obj[1];
    }

    function delete($key)
    {
        $_key = $this->getKey($key);
        $this->_delete($_key);
    }

    function _delete($_key)
    {
        $this->Memcache->delete($_key);
    }

    function truncate()
    {
        return $this->Memcache->flush();
    }

}
/* End of file CacheMemcache.class.php */
/* Location: ./classes/cache/CacheMemcache.class.php */