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/* -*-c++-*- */
/* osgEarth - Dynamic map generation toolkit for OpenSceneGraph
 * Copyright 2008-2013 Pelican Mapping
 * http://osgearth.org
 *
 * osgEarth 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 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>
 */

#ifndef OSGEARTHSYMBOLOGY_RESOURCE_CACHE_H
#define OSGEARTHSYMBOLOGY_RESOURCE_CACHE_H 1

#include <osgEarthSymbology/Common>
#include <osgEarthSymbology/Skins>
#include <osgEarthSymbology/MarkerResource>
#include <osgEarthSymbology/InstanceResource>
#include <osgEarth/Containers>
#include <osgEarth/ThreadingUtils>

namespace osgEarth { namespace Symbology
{
    using namespace osgEarth;

    /**
     * Caches the runtime objects created by resources, so we can avoid creating them
     * each time they are referenced.
     *
     * This object is intended for use by a FilterContext, and therefore will only
     * run in an isolated thread. No thread-safety is required in that scenario.
     */
    class OSGEARTHSYMBOLOGY_EXPORT ResourceCache : public osg::Referenced
    {
    public:
        /** 
         * Constructs a new resource cache.
         * @param threadSafe Whether to protect access to the cache so that you can
         *        use it from multiple threads (default = false)
         */
        ResourceCache( 
            const osgDB::Options* dbOptions,
            bool                  threadSafe =false );

        /** dtor */
        virtual ~ResourceCache() { }

        /**
         * Fetches the StateSet implementation corresponding to a Skin.
         */
        osg::StateSet* getStateSet( SkinResource* skin );

        /**
         * Get the statistics collected from the skin cache.
         */
        const CacheStats getSkinStats() const { return _skinCache.getStats(); }

        /**
         * Gets a node corresponding to a marker.
         * @deprecated
         */
        osg::Node* getMarkerNode( MarkerResource* marker );

        /**
         * Gets a node corresponding to an instance resource.
         */
        osg::Node* getInstanceNode( InstanceResource* instance );

    protected:
        osg::ref_ptr<const osgDB::Options> _dbOptions;
        bool                               _threadSafe;
        Threading::ReadWriteMutex          _mutex;

        typedef LRUCache<SkinResource*, osg::ref_ptr<osg::StateSet> > SkinCache;
        SkinCache _skinCache;

        typedef LRUCache<MarkerResource*, osg::ref_ptr<osg::Node> > MarkerCache;
        MarkerCache _markerCache;

        typedef LRUCache<InstanceResource*, osg::ref_ptr<osg::Node> > InstanceCache;
        InstanceCache _instanceCache;
    };

} } // namespace osgEarth::Symbology

#endif // OSGEARTHSYMBOLOGY_RESOURCE_CACHE_H