code: public void marshall(SignalExternalWorkflowExecutionInitiatedEventAttributes signalExternalWorkflowExecutionInitiatedEventAttributes,
              ProtocolMarshaller protocolMarshaller) {
  
          if (signalExternalWorkflowExecutionInitiatedEventAttributes == null) {
              throw new SdkClientException("Invalid argument passed to marshall(...)");
          }
  
          try {
              protocolMarshaller.marshall(signalExternalWorkflowExecutionInitiatedEventAttributes.getWorkflowId(), WORKFLOWID_BINDING);
              protocolMarshaller.marshall(signalExternalWorkflowExecutionInitiatedEventAttributes.getRunId(), RUNID_BINDING);
              protocolMarshaller.marshall(signalExternalWorkflowExecutionInitiatedEventAttributes.getSignalName(), SIGNALNAME_BINDING);
              protocolMarshaller.marshall(signalExternalWorkflowExecutionInitiatedEventAttributes.getInput(), INPUT_BINDING);
              protocolMarshaller.marshall(signalExternalWorkflowExecutionInitiatedEventAttributes.getDecisionTaskCompletedEventId(),
                      DECISIONTASKCOMPLETEDEVENTID_BINDING);
              protocolMarshaller.marshall(signalExternalWorkflowExecutionInitiatedEventAttributes.getControl(), CONTROL_BINDING);
          } catch (Exception e) {
              throw new SdkClientException("Unable to marshall request to JSON: " + e.getMessage(), e);
          }
      }
docs: Marshall the given parameter object.