code: public void marshall(DescribeDimensionKeysRequest describeDimensionKeysRequest, ProtocolMarshaller protocolMarshaller) {
  
          if (describeDimensionKeysRequest == null) {
              throw new SdkClientException("Invalid argument passed to marshall(...)");
          }
  
          try {
              protocolMarshaller.marshall(describeDimensionKeysRequest.getServiceType(), SERVICETYPE_BINDING);
              protocolMarshaller.marshall(describeDimensionKeysRequest.getIdentifier(), IDENTIFIER_BINDING);
              protocolMarshaller.marshall(describeDimensionKeysRequest.getStartTime(), STARTTIME_BINDING);
              protocolMarshaller.marshall(describeDimensionKeysRequest.getEndTime(), ENDTIME_BINDING);
              protocolMarshaller.marshall(describeDimensionKeysRequest.getMetric(), METRIC_BINDING);
              protocolMarshaller.marshall(describeDimensionKeysRequest.getPeriodInSeconds(), PERIODINSECONDS_BINDING);
              protocolMarshaller.marshall(describeDimensionKeysRequest.getGroupBy(), GROUPBY_BINDING);
              protocolMarshaller.marshall(describeDimensionKeysRequest.getPartitionBy(), PARTITIONBY_BINDING);
              protocolMarshaller.marshall(describeDimensionKeysRequest.getFilter(), FILTER_BINDING);
              protocolMarshaller.marshall(describeDimensionKeysRequest.getMaxResults(), MAXRESULTS_BINDING);
              protocolMarshaller.marshall(describeDimensionKeysRequest.getNextToken(), NEXTTOKEN_BINDING);
          } catch (Exception e) {
              throw new SdkClientException("Unable to marshall request to JSON: " + e.getMessage(), e);
          }
      }
docs: Marshall the given parameter object.