public function receiveMeta($metaData, $source)
    {
        if ($source === $this->container[0]["source"]) {
            $this->container[0]["meta"] = $metaData;
        } else {
            $this->container[1]["meta"] = $metaData;
        }
        if ($this->container[0]["meta"] && $this->container[1]["meta"]) {
            $meta = array(
                "columns" => array_merge(
                    $this->container[0]["meta"]["columns"],
                    $this->container[1]["meta"]["columns"]
                ),
            );
            $this->sendMeta($meta);
        }
    }