LFUCachePolicy.h

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/*  Copyright (C) 2008 National Institute For Space Research (INPE) - Brazil.
 
    This file is part of the TerraLib - a Framework for building GIS enabled applications.
 
    TerraLib is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation, either version 3 of the License,
    or (at your option) any later version.
 
    TerraLib is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
    along with TerraLib. See COPYING. If not, write to
    TerraLib Team at <terralib-team@terralib.org>.
 */
 
/*!
  \file LFUCachePolicy.h
 
  \brief This class is used to implement the LFU cache policy.
*/
 
#ifndef __TERRALIB_GRAPH_INTERNAL_LFUCACHEPOLICY_H
#define __TERRALIB_GRAPH_INTERNAL_LFUCACHEPOLICY_H
 
// Terralib Includes
#include "../Config.h"
#include "AbstractCachePolicy.h"
 
// STL Includes
#include <map>
 
namespace te
{
  namespace graph
  {
    /*!
      \class LFUCachePolicy
 
      \brief This class is used to implement the LFU cache policy.
 
      \sa AbstractCachePolicy
    */
 
    class TEGRAPHEXPORT LFUCachePolicy : public AbstractCachePolicy
    {
      public:
 
        /*! \brief Default constructor. */
        LFUCachePolicy();
 
        /*! \brief Virtual destructor. */
        virtual ~LFUCachePolicy();
 
        
        /** @name Access Methods
         *  Method used to access the cache policy
         */
        //@{
 
        /*!
          \brief Function used to add a new index to be controlled.
 
          \param value  Object index attribute
 
         */
        virtual void added(int value);
 
        /*!
          \brief Function used to inform that an index must be updated
 
          \param value  Object index attribute
 
         */
        virtual void update(int value);
 
        /*!
          \brief Function used to check what index has to be removed from the cache
 
          \param value  Object index attribute
 
         */
        virtual void toRemove(int& value);
 
        /*!
          \brief Function used to inform that an index was accessed.
 
          \param value  Object index attribute
 
         */
        virtual void accessed(int value);
 
        //@}
 
      protected:
 
        std::map<int, double> m_LFU;  // This map is used to keep the least frequently used order - LFU policy
    };
 
  } // end namespace graph
} // end namespace te
 
#endif // __TERRALIB_GRAPH_INTERNAL_LFUCACHEPOLICY_H