code: protected void sendMessage(String dest, Message message) {
      if (LOG.isTraceEnabled()) {
        LOG.trace("Sends message {} to {}.",
                  TextFormat.shortDebugString(message),
                  dest);
      }
      this.transport.send(dest, message);
    }
docs: Sends message to the specific destination.
  
  @param dest the destination of the message.
  @param message the message to be sent.