protected void sendRequest(
      HttpRequest request,
      SendRequestResultListener listener,
      HttpResponseProcessor responseProcessor) {
    if (isClosingOrClosed()) {
      listener.onSendRequestFailure(request, new ClosedChannelException());
    } else if (!isConnected()) {
      listener.onSendRequestFailure(request, new RuntimeException("unable to send request"));
    } else {
      try {
        setResponseProcessor(responseProcessor, listener);
      } catch (DatabusException e) {
        listener.onSendRequestFailure(request, e.getCause());
        _channel.close();
        return;
      }

      // Send the HTTP request.
      if (_channel.isConnected()) {
        // ChannelFuture future = _channel.write(request);
        // future.addListener(new MySendRequestListener(request, listener));
        _channel.write(request);
      } else {
        _log.error("disconnect on request: " + request.getUri());
        listener.onSendRequestFailure(request, new ClosedChannelException());
      }
    }
  }