CMemCache

protected function addValue($key,$value,$expire)
{
    if($expire>0)
        $expire+=time();
    else
        $expire=0;

    return $this->useMemcached ? $this->_cache->add($key,$value,$expire) : $this->_cache->add($key,$value,0,$expire);
}

protected function deleteValue($key)
{
    return $this->_cache->delete($key, 0);
}

protected function flushValues()
{
    return $this->_cache->flush();
}

public function getMemCache()
{
    if($this->_cache!==null)
        return $this->_cache;
    else
    {
        $extension=$this->useMemcached ? 'memcached' : 'memcache';
        if(!extension_loaded($extension))
            throw new CException(Yii::t('yii',"CMemCache requires PHP {extension} extension to be loaded.",
                array('{extension}'=>$extension)));
        return $this->_cache=$this->useMemcached ? new Memcached : new Memcache;
    }
}

public function getServers()
{
    return $this->_servers;
}

protected function getValue($key)
{
    return $this->_cache->get($key);
}

protected function getValues($keys)
{
    return $this->useMemcached ? $this->_cache->getMulti($keys) : $this->_cache->get($keys);
}

public function init()
{
    parent::init();
    $servers=$this->getServers();
    $cache=$this->getMemCache();
    if(count($servers))
    {
        foreach($servers as $server)
        {
            if($this->useMemcached)
                $cache->addServer($server->host,$server->port,$server->weight);
            else
                $cache->addServer($server->host,$server->port,$server->persistent,$server->weight,$server->timeout,$server->retryInterval,$server->status);
        }
    }
    else
        $cache->addServer('localhost',11211);
}

public function setServers($config)
{
    foreach($config as $c)
        $this->_servers[]=new CMemCacheServerConfiguration($c);
}

protected function setValue($key,$value,$expire)
{
    if($expire>0)
        $expire+=time();
    else
        $expire=0;

    return $this->useMemcached ? $this->_cache->set($key,$value,$expire) : $this->_cache->set($key,$value,0,$expire);
}