private void writeAssignedChannel(SelectionKey key, Selector sel) throws IOException {
        if (key.attachment() == null) {
            key.attach(new StringBuilder());
        }
        StringBuilder builder = (StringBuilder) key.attachment();


        String data = ByteBufferUtil.readFromChannelBuffered(channel);
        stringBuilder.append(data);
        if (data.endsWith(delimiter)) {

        }
//TODO
    }