itkLoggerThreadWrapper.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkLoggerThreadWrapper.h,v $
  Language:  C++
  Date:      $Date: 2009-02-05 19:05:01 $
  Version:   $Revision: 1.9 $

  Copyright (c) Insight Software Consortium. All rights reserved.
  See ITKCopyright.txt or http://www.itk.org/HTML/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 notices for more information.

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

#ifndef __itkLoggerThreadWrapper_h
#define __itkLoggerThreadWrapper_h

//NOTE: This class does not work under MSVS6, or gnu 2.95
#if ! ( defined(_MSC_VER) || ( defined(__GNUC__) && (__GNUC__ <= 2) ))

#include "itkMacro.h"
#include "itkMultiThreader.h"
#include "itkSimpleFastMutexLock.h"

#include <string>
#include <queue>

namespace itk
{

// MSVS6 can't do this type of nested template
template < class SimpleLoggerType >
class LoggerThreadWrapper : public SimpleLoggerType
{
public:
  
  typedef LoggerThreadWrapper       Self;
  typedef SimpleLoggerType          Superclass;
  typedef SmartPointer<Self>        Pointer;
  typedef SmartPointer<const Self>  ConstPointer;
  
  itkTypeMacro( LoggerThreadWrapper, SimpleLoggerType );

  itkNewMacro( Self );

  typedef  typename SimpleLoggerType::OutputType         OutputType;
  typedef  typename SimpleLoggerType::PriorityLevelType  PriorityLevelType;
  
  typedef enum
    {
    SET_PRIORITY_LEVEL,
    SET_LEVEL_FOR_FLUSHING,
    ADD_LOG_OUTPUT,
    WRITE,
    FLUSH
    } OperationType;

  
  virtual void SetPriorityLevel( PriorityLevelType level );

  virtual PriorityLevelType GetPriorityLevel() const;

  virtual void SetLevelForFlushing( PriorityLevelType level );
  virtual PriorityLevelType GetLevelForFlushing() const;
  
  virtual void AddLogOutput( OutputType* output );

  virtual void Write(PriorityLevelType level, std::string const & content);
  
  virtual void Flush();
  
protected:
  
  LoggerThreadWrapper();

  virtual ~LoggerThreadWrapper();

  virtual void PrintSelf(std::ostream &os, Indent indent) const;

  static ITK_THREAD_RETURN_TYPE ThreadFunction(void*);
  
private:
  
  typedef std::queue<OperationType> OperationContainerType;
  
  typedef std::queue<std::string>  MessageContainerType;
  
  typedef std::queue<PriorityLevelType>  LevelContainerType;
  
  typedef std::queue<typename OutputType::Pointer>  OutputContainerType;
  
  MultiThreader::Pointer  m_Threader;
  
  int m_ThreadID;
  
  OperationContainerType  m_OperationQ;
  
  MessageContainerType  m_MessageQ;
  
  LevelContainerType  m_LevelQ;
  
  OutputContainerType m_OutputQ;
  
  SimpleFastMutexLock m_Mutex;
  
  SimpleFastMutexLock m_WaitMutex;
  
};  // class LoggerThreadWrapper
} // namespace itk
  
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkLoggerThreadWrapper.txx"
#endif
  
  
  
#endif  // !defined (_MSC_VER)
#endif  // __itkLoggerThreadWrapper_h