public int getSerializedSize() {
      int size = memoizedSerializedSize;
      if (size != -1) return size;

      size = 0;
      if (((bitField0_ & 0x00000001) == 0x00000001)) {
        size += com.google.protobuf.CodedOutputStream
          .computeEnumSize(1, messageType_.getNumber());
      }
      if (((bitField0_ & 0x00000002) == 0x00000002)) {
        size += com.google.protobuf.CodedOutputStream
          .computeInt64Size(2, messageId_);
      }
      if (((bitField0_ & 0x00000004) == 0x00000004)) {
        size += com.google.protobuf.CodedOutputStream
          .computeMessageSize(3, executionStartingRequest_);
      }
      if (((bitField0_ & 0x00000008) == 0x00000008)) {
        size += com.google.protobuf.CodedOutputStream
          .computeMessageSize(4, specExecutionStartingRequest_);
      }
      if (((bitField0_ & 0x00000010) == 0x00000010)) {
        size += com.google.protobuf.CodedOutputStream
          .computeMessageSize(5, specExecutionEndingRequest_);
      }
      if (((bitField0_ & 0x00000020) == 0x00000020)) {
        size += com.google.protobuf.CodedOutputStream
          .computeMessageSize(6, scenarioExecutionStartingRequest_);
      }
      if (((bitField0_ & 0x00000040) == 0x00000040)) {
        size += com.google.protobuf.CodedOutputStream
          .computeMessageSize(7, scenarioExecutionEndingRequest_);
      }
      if (((bitField0_ & 0x00000080) == 0x00000080)) {
        size += com.google.protobuf.CodedOutputStream
          .computeMessageSize(8, executeStepRequest_);
      }
      if (((bitField0_ & 0x00000100) == 0x00000100)) {
        size += com.google.protobuf.CodedOutputStream
          .computeMessageSize(9, executeStepResponse_);
      }
      if (((bitField0_ & 0x00000200) == 0x00000200)) {
        size += com.google.protobuf.CodedOutputStream
          .computeMessageSize(10, executionEndingRequest_);
      }
      if (((bitField0_ & 0x00000400) == 0x00000400)) {
        size += com.google.protobuf.CodedOutputStream
          .computeMessageSize(11, stepValidateRequest_);
      }
      if (((bitField0_ & 0x00000800) == 0x00000800)) {
        size += com.google.protobuf.CodedOutputStream
          .computeMessageSize(12, stepValidateResponse_);
      }
      if (((bitField0_ & 0x00001000) == 0x00001000)) {
        size += com.google.protobuf.CodedOutputStream
          .computeMessageSize(13, executionStatusResponse_);
      }
      size += getUnknownFields().getSerializedSize();
      memoizedSerializedSize = size;
      return size;
    }