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

  Program:   ParaView
  Module:    vtkSIObject.h

  Copyright (c) Kitware, Inc.
  All rights reserved.
  See Copyright.txt or http://www.paraview.org/HTML/Copyright.html 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.

=========================================================================*/
/**
 * @class   vtkSIObject
 *
 * Object that is managed by vtkPVSessionCore which wrap concrete class such as
 * the vtk ones.
*/

#ifndef vtkSIObject_h
#define vtkSIObject_h

#include "vtkObject.h"
#include "vtkPVServerImplementationCoreModule.h" //needed for exports
#include "vtkSMMessageMinimal.h"                 // needed for vtkSMMessage
#include "vtkWeakPointer.h"                      // needed for vtkWeakPointer

class vtkClientServerInterpreter;
class vtkPVSessionCore;

class VTKPVSERVERIMPLEMENTATIONCORE_EXPORT vtkSIObject : public vtkObject
{
public:
  static vtkSIObject* New();
  vtkTypeMacro(vtkSIObject, vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent) VTK_OVERRIDE;

  /**
   * This method is called before the deletion of the SIObject.
   * Basically this is used to remove all dependency with other SIObject so after
   * a first pass on all SIObject with a AboutToDelete() we can simply delete the
   * remaining SIObjects.
   */
  virtual void AboutToDelete(){};

  /**
   * Initializes the instance. Session is the session to which this instance
   * belongs to. During initialization, the SIObject basically obtains ivars for
   * necessary components.
   */
  virtual void Initialize(vtkPVSessionCore* session);

  /**
   * Push a new state to the underneath implementation
   * The provided implementation just store the message
   * and return it at the Pull one.
   */
  virtual void Push(vtkSMMessage* msg);

  /**
   * Pull the current state of the underneath implementation
   * The provided implementation update the given message with the one
   * that has been previously pushed
   */
  virtual void Pull(vtkSMMessage* msg);

  /**
   * Provides access to the Interpreter.
   */
  vtkClientServerInterpreter* GetInterpreter();

  /**
   * Convenience method to obtain a vtkSIObject subclass given its global id.
   */
  vtkSIObject* GetSIObject(vtkTypeUInt32 globalid) const;

  /**
   * Convenience method to obtain a vtkObject subclass given its
   * global id.
   */
  vtkObject* GetRemoteObject(vtkTypeUInt32 globalid);

  //@{
  /**
   * Get/Set the global id for this object.
   */
  vtkSetMacro(GlobalID, vtkTypeUInt32);
  vtkGetMacro(GlobalID, vtkTypeUInt32);
  //@}

protected:
  vtkSIObject();
  ~vtkSIObject() override;

  vtkWeakPointer<vtkClientServerInterpreter> Interpreter;
  vtkWeakPointer<vtkPVSessionCore> SessionCore;

  vtkSMMessage* LastPushedMessage;

  vtkTypeUInt32 GlobalID;

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

#endif // #ifndef vtkSIObject_h
