@Override
        public Encoder getEncoder() {
            return new Encoder() {

                @Override
                public IoBuffer encode(final Object message, final Session session) {
                    return ((MetaEncodeCommand) message).encode();
                }
            };
        }
result code length opaque\r\n message

@param buff
@param sa
@return
metamorphosis-commons/src/main/java/com/taobao/metamorphosis/network/MetamorphosisWireFormatType.java