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

  Program:   ParaView
  Module:    vtkSession.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.

=========================================================================*/
// .NAME vtkSession
// .SECTION Description
// vtkSession defines a session i.e. a conversation, if you will. It can be
// between different processes or same process. What types of conversations are
// possible i.e what protocols are supported, is defined by the subclasses.

#ifndef vtkSession_h
#define vtkSession_h

#include "vtkPVClientServerCoreCoreModule.h" //needed for exports
#include "vtkObject.h"

class VTKPVCLIENTSERVERCORECORE_EXPORT vtkSession : public vtkObject
{
public:
  vtkTypeMacro(vtkSession, vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  // Returns true is this session is active/alive/valid.
  virtual bool GetIsAlive() = 0;

//BTX
protected:
  vtkSession();
  ~vtkSession();

  // Needed when TileDisplay are retreived
  friend class vtkSMRenderViewProxy;
  // Need to manually active the session
  friend class vtkPVServerSideAnimationPlayer;

  // Description:
  // Subclasses must call this to mark the session active. This sets the active
  // session pointer held by the vtkProcessModule, making it easier for filters
  // etc. that need information about the active session to access it.
  virtual void Activate();

  // Description:
  // Subclasses must call this to mark the session inactive. This sets the active
  // session pointer held by the vtkProcessModule, making it easier for filters
  // etc. that need information about the active session to access it.
  virtual void DeActivate();

private:
  vtkSession(const vtkSession&); // Not implemented
  void operator=(const vtkSession&); // Not implemented
//ETX
};

#endif