vtkExecutive.h

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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#ifndef vtkExecutive_h
#define vtkExecutive_h

#include "vtkCommonExecutionModelModule.h" // For export macro
#include "vtkObject.h"
#include "vtkWrappingHints.h" // For VTK_MARSHALAUTO

VTK_ABI_NAMESPACE_BEGIN
class vtkAlgorithm;
class vtkAlgorithmOutput;
class vtkAlgorithmToExecutiveFriendship;
class vtkDataObject;
class vtkExecutiveInternals;
class vtkInformation;
class vtkInformationExecutivePortKey;
class vtkInformationExecutivePortVectorKey;
class vtkInformationIntegerKey;
class vtkInformationRequestKey;
class vtkInformationKeyVectorKey;
class vtkInformationVector;

class VTKCOMMONEXECUTIONMODEL_EXPORT VTK_MARSHALAUTO vtkExecutive : public vtkObject
{
public:
  vtkTypeMacro(vtkExecutive, vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  vtkAlgorithm* GetAlgorithm();

  virtual vtkTypeBool ProcessRequest(
    vtkInformation* request, vtkInformationVector** inInfo, vtkInformationVector* outInfo);

  virtual int ComputePipelineMTime(vtkInformation* request, vtkInformationVector** inInfoVec,
    vtkInformationVector* outInfoVec, int requestFromOutputPort, vtkMTimeType* mtime);

  virtual int UpdateInformation() { return 1; }


  virtual vtkTypeBool Update();
  virtual vtkTypeBool Update(int port);


  int GetNumberOfInputPorts();
  int GetNumberOfOutputPorts();

  int GetNumberOfInputConnections(int port);

  virtual vtkInformation* GetOutputInformation(int port);

  vtkInformationVector* GetOutputInformation();

  vtkInformation* GetInputInformation(int port, int connection);

  vtkInformationVector* GetInputInformation(int port);

  vtkInformationVector** GetInputInformation();

  vtkExecutive* GetInputExecutive(int port, int connection);


  virtual vtkDataObject* GetOutputData(int port);
  virtual void SetOutputData(int port, vtkDataObject*, vtkInformation* info);
  virtual void SetOutputData(int port, vtkDataObject*);


  virtual vtkDataObject* GetInputData(int port, int connection);
  virtual vtkDataObject* GetInputData(int port, int connection, vtkInformationVector** inInfoVec);


  void SetSharedInputInformation(vtkInformationVector** inInfoVec);
  void SetSharedOutputInformation(vtkInformationVector* outInfoVec);


  bool UsesGarbageCollector() const override { return true; }

  static vtkInformationExecutivePortKey* PRODUCER();

  static vtkInformationExecutivePortVectorKey* CONSUMERS();

  static vtkInformationIntegerKey* FROM_OUTPUT_PORT();


  static vtkInformationIntegerKey* ALGORITHM_BEFORE_FORWARD();
  static vtkInformationIntegerKey* ALGORITHM_AFTER_FORWARD();
  static vtkInformationIntegerKey* ALGORITHM_DIRECTION();
  static vtkInformationIntegerKey* FORWARD_DIRECTION();
  static vtkInformationKeyVectorKey* KEYS_TO_COPY();

  enum
  {
    RequestUpstream,
    RequestDownstream
  };
  enum
  {
    BeforeForward,
    AfterForward
  };

  virtual int CallAlgorithm(vtkInformation* request, int direction, vtkInformationVector** inInfo,
    vtkInformationVector* outInfo);

protected:
  vtkExecutive();
  ~vtkExecutive() override;

  // Helper methods for subclasses.
  int InputPortIndexInRange(int port, const char* action);
  int OutputPortIndexInRange(int port, const char* action);

  // Called by methods to check for a recursive pipeline update.  A
  // request should be fulfilled without making another request.  This
  // is used to help enforce that behavior.  Returns 1 if no recursive
  // request is occurring, and 0 otherwise.  An error message is
  // produced automatically if 0 is returned.  The first argument is
  // the name of the calling method (the one that should not be
  // invoked recursively during an update).  The second argument is
  // the recursive request information object, if any.  It is used to
  // construct the error message.
  int CheckAlgorithm(const char* method, vtkInformation* request);

  bool CheckAbortedInput(vtkInformationVector** inInfoVec);

  virtual int ForwardDownstream(vtkInformation* request);
  virtual int ForwardUpstream(vtkInformation* request);
  virtual void CopyDefaultInformation(vtkInformation* request, int direction,
    vtkInformationVector** inInfo, vtkInformationVector* outInfo);

  // Reset the pipeline update values in the given output information object.
  virtual void ResetPipelineInformation(int port, vtkInformation*) = 0;

  // Bring the existence of output data objects up to date.
  virtual int UpdateDataObject() = 0;

  // Garbage collection support.
  void ReportReferences(vtkGarbageCollector*) override;

  virtual void SetAlgorithm(vtkAlgorithm* algorithm);

  // The algorithm managed by this executive.
  vtkAlgorithm* Algorithm;

  // Flag set when the algorithm is processing a request.
  int InAlgorithm;

  // Pointers to an outside instance of input or output information.
  // No references are held.  These are used to implement internal
  // pipelines.
  vtkInformationVector** SharedInputInformation;
  vtkInformationVector* SharedOutputInformation;

private:
  // Store an information object for each output port of the algorithm.
  vtkInformationVector* OutputInformation;

  // Internal implementation details.
  vtkExecutiveInternals* ExecutiveInternal;

  friend class vtkAlgorithmToExecutiveFriendship;

  vtkExecutive(const vtkExecutive&) = delete;
  void operator=(const vtkExecutive&) = delete;
};

VTK_ABI_NAMESPACE_END
#endif