public function del($userId, $callId)
    {
        $key = $this->getCacheKey($userId, $callId);
        $this->putInCache($key, $userId, $callId, null, self::STATE_PENDING_DELETE);
        return true;
    }
public function del($userId, $callId)
    {
        $key = $this->getCacheKey($userId, $callId);
        $this->putInCache($key, $userId, $callId, null, self::STATE_PENDING_DELETE);
        return true;
    }
public function del ( $ userId , $ callId ) { $ key = $ this -> getCacheKey ( $ userId , $ callId ) ; $ this -> putInCache ( $ key , $ userId , $ callId , null , self :: STATE_PENDING_DELETE ) ; return true ; }
Marks the the dataset to be removed from the storage.

@param string $userId
@param string $callId
@return boolean
Marks the the dataset to be removed from the storage .