private RpcRequestCommand createRequestCommand(short cmdCode, long headerArriveTimeInNano) {
        RpcRequestCommand command = new RpcRequestCommand();
        command.setCmdCode(RpcCommandCode.valueOf(cmdCode));
        command.setArriveTime(System.currentTimeMillis());
        command.setArriveHeaderTimeInNano(headerArriveTimeInNano);
        command.setArriveBodyTimeInNano(System.nanoTime());
        return command;
    }
@see CommandDecoder#decode(ChannelHandlerContext, ByteBuf, List)
src/main/java/com/alipay/remoting/rpc/protocol/RpcCommandDecoderV2.java