vtkReductionFilter.h

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/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkReductionFilter.h

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
#ifndef vtkReductionFilter_h
#define vtkReductionFilter_h

#include "vtkDataObjectAlgorithm.h"
#include "vtkPVVTKExtensionsMiscModule.h" // needed for export macro
#include "vtkSmartPointer.h"              // needed for vtkSmartPointer.
#include <vector>                         //  needed for std::vector

class vtkMultiProcessController;
class vtkSelection;
class VTKPVVTKEXTENSIONSMISC_EXPORT vtkReductionFilter : public vtkDataObjectAlgorithm
{
public:
  static vtkReductionFilter* New();
  vtkTypeMacro(vtkReductionFilter, vtkDataObjectAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  typedef enum ReductionModeType
  {
    REDUCE_ALL_TO_ONE = 0,
    MOVE_ALL_TO_ONE = 1,
    REDUCE_ALL_TO_ALL = 2
  } ReductionModeType;


  vtkSetClampMacro(ReductionMode, int, vtkReductionFilter::REDUCE_ALL_TO_ONE,
    vtkReductionFilter::REDUCE_ALL_TO_ALL);
  vtkGetMacro(ReductionMode, int);


  vtkSetMacro(ReductionProcessId, int);
  vtkGetMacro(ReductionProcessId, int);


  void SetPreGatherHelper(vtkAlgorithm*);
  void SetPreGatherHelperName(const char*);
  vtkGetObjectMacro(PreGatherHelper, vtkAlgorithm);


  void SetPostGatherHelper(vtkAlgorithm*);
  void SetPostGatherHelperName(const char*);
  vtkGetObjectMacro(PostGatherHelper, vtkAlgorithm);

  void SetController(vtkMultiProcessController*);


  vtkSetMacro(PassThrough, int);
  vtkGetMacro(PassThrough, int);


  vtkSetMacro(GenerateProcessIds, int);
  vtkGetMacro(GenerateProcessIds, int);

  enum Tags
  {
    TRANSMIT_DATA_OBJECT = 23484
  };

protected:
  vtkReductionFilter();
  ~vtkReductionFilter() override;

  // Overridden to mark input as optional, since input data may
  // not be available on all processes that this filter is instantiated.
  int FillInputPortInformation(int port, vtkInformation* info) override;

  int RequestDataObject(vtkInformation* request, vtkInformationVector** inputVector,
    vtkInformationVector* outputVector) override;
  int RequestData(vtkInformation* request, vtkInformationVector** inputVector,
    vtkInformationVector* outputVector) override;

  void Reduce(vtkDataObject* input, vtkDataObject* output);
  vtkDataObject* PreProcess(vtkDataObject* input);
  void PostProcess(
    vtkDataObject* output, vtkSmartPointer<vtkDataObject> inputs[], unsigned int num_inputs);

  int GatherSelection(vtkSelection* sendData,
    std::vector<vtkSmartPointer<vtkDataObject>>& receiveData, int destProcessId);

  vtkAlgorithm* PreGatherHelper;
  vtkAlgorithm* PostGatherHelper;
  vtkMultiProcessController* Controller;
  int PassThrough;
  int GenerateProcessIds;
  int ReductionMode;
  int ReductionProcessId;

private:
  vtkReductionFilter(const vtkReductionFilter&) = delete;
  void operator=(const vtkReductionFilter&) = delete;
};

#endif