DeleteHandler.h

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/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
 *
 * This library is open source and may be redistributed and/or modified under
 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
 * (at your option) any later version.  The full license is in LICENSE file
 * included with this distribution, and on the openscenegraph.org website.
 *
 * This library 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
 * OpenSceneGraph Public License for more details.
*/

#ifndef OSG_DELETEHANDLER
#define OSG_DELETEHANDLER 1

#include <osg/Referenced>

#include <list>

namespace osg {


class OSG_EXPORT DeleteHandler
{
    public:

        typedef std::pair<unsigned int, const osg::Referenced*> FrameNumberObjectPair;
        typedef std::list<FrameNumberObjectPair> ObjectsToDeleteList;

        DeleteHandler(int numberOfFramesToRetainObjects=0);

        virtual ~DeleteHandler();

        void setNumFramesToRetainObjects(unsigned int numberOfFramesToRetainObjects) {  _numFramesToRetainObjects = numberOfFramesToRetainObjects; }

        unsigned int getNumFramesToRetainObjects() const { return _numFramesToRetainObjects; }

        void setFrameNumber(unsigned int frameNumber) { _currentFrameNumber = frameNumber; }

        unsigned int getFrameNumber() const { return _currentFrameNumber; }

        inline void doDelete(const Referenced* object) { delete object; }

        virtual void flush();

        virtual void flushAll();

        virtual void requestDelete(const osg::Referenced* object);

    protected:

        DeleteHandler(const DeleteHandler&):
            _numFramesToRetainObjects(0),
            _currentFrameNumber(0) {}
        DeleteHandler operator = (const DeleteHandler&) { return *this; }

        unsigned int            _numFramesToRetainObjects;
        unsigned int            _currentFrameNumber;
        OpenThreads::Mutex      _mutex;
        ObjectsToDeleteList     _objectsToDelete;

};

}

#endif