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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkMPIEventLog.h,v $

  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.

=========================================================================*/
// .NAME vtkMPIEventLog - Class for logging and timing.

// .SECTION Description
// This class is wrapper around MPE event logging functions
// (available from Argonne National Lab/Missippi State
// University). It allows users to create events with names
// and log them. Different log file formats can be generated
// by changing MPE's configuration. Some of these formats are
// binary (for examples SLOG and CLOG) and can be analyzed with
// viewers from ANL. ALOG is particularly useful since it is
// text based and can be processed with simple scripts.

// .SECTION See Also
// vtkTimerLog vtkMPIController vtkMPICommunicator

#ifndef __vtkMPIEventLog_h
#define __vtkMPIEventLog_h

#include "vtkObject.h"

class VTK_PARALLEL_EXPORT vtkMPIEventLog : public vtkObject
{
public:
  vtkTypeRevisionMacro(vtkMPIEventLog,vtkObject);
  
  // Description:
  // Construct a vtkMPIEventLog with the following initial state:
  // Processes = 0, MaximumNumberOfProcesses = 0.
  static vtkMPIEventLog* New();
  
  // Description:
  // Used to initialize the underlying mpe event.
  // HAS TO BE CALLED BY ALL PROCESSES before any event 
  // logging is done.
  // It takes a name and a description for the graphical
  // representation, for example, "red:vlines3". See
  // mpe documentation for details.
  // Returns 0 on MPI failure (or aborts depending on
  // MPI error handlers)
  int SetDescription(const char* name, const char* desc);

  // Description:
  // These methods have to be called once on all processors
  // before and after invoking any logging events.
  // The name of the logfile is given by fileName.
  // See mpe documentation for file formats.
  static void InitializeLogging();
  static void FinalizeLogging(const char* fileName);

  // Description:
  // Issue start and stop events for this log entry.
  void StartLogging();
  void StopLogging();

  virtual void PrintSelf(ostream& os, vtkIndent indent);

protected:

  vtkMPIEventLog();
  ~vtkMPIEventLog();

  static int LastEventId;
  int Active;
  int BeginId;
  int EndId;
private:
  vtkMPIEventLog(const vtkMPIEventLog&);  // Not implemented.
  void operator=(const vtkMPIEventLog&);  // Not implemented.
};

#endif