code: private static String formatSimple(ChannelHandlerContext ctx, String eventName, Object msg) {
          String chStr = ctx.channel().toString();
          String msgStr = String.valueOf(msg);
          StringBuilder buf = new StringBuilder(chStr.length() + 1 + eventName.length() + 2 + msgStr.length());
          return buf.append(chStr).append(' ').append(eventName).append(": ").append(msgStr).toString();
      }
docs: Generates the default log message of the specified event whose argument is an arbitrary object.