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102 lines
4 KiB
C++
102 lines
4 KiB
C++
// Resource ObjectCache for OpenMW, forked from osgDB ObjectCache by Robert Osfield, see copyright notice below.
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// The main change from the upstream version is that removeExpiredObjectsInCache no longer keeps a lock while the unref happens.
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/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
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*
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* This library is open source and may be redistributed and/or modified under
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
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* (at your option) any later version. The full license is in LICENSE file
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* included with this distribution, and on the openscenegraph.org website.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* OpenSceneGraph Public License for more details.
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*/
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#ifndef OPENMW_COMPONENTS_RESOURCE_OBJECTCACHE
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#define OPENMW_COMPONENTS_RESOURCE_OBJECTCACHE
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#include <osg/Referenced>
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#include <osg/ref_ptr>
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#include <string>
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#include <map>
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namespace osg
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{
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class Object;
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class State;
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class NodeVisitor;
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}
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namespace Resource {
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class ObjectCache : public osg::Referenced
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{
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public:
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ObjectCache();
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/** For each object in the cache which has an reference count greater than 1
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* (and therefore referenced by elsewhere in the application) set the time stamp
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* for that object in the cache to specified time.
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* This would typically be called once per frame by applications which are doing database paging,
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* and need to prune objects that are no longer required.
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* The time used should be taken from the FrameStamp::getReferenceTime().*/
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void updateTimeStampOfObjectsInCacheWithExternalReferences(double referenceTime);
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/** Removed object in the cache which have a time stamp at or before the specified expiry time.
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* This would typically be called once per frame by applications which are doing database paging,
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* and need to prune objects that are no longer required, and called after the a called
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* after the call to updateTimeStampOfObjectsInCacheWithExternalReferences(expirtyTime).*/
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void removeExpiredObjectsInCache(double expiryTime);
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/** Remove all objects in the cache regardless of having external references or expiry times.*/
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void clear();
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/** Add a filename,object,timestamp triple to the Registry::ObjectCache.*/
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void addEntryToObjectCache(const std::string& filename, osg::Object* object, double timestamp = 0.0);
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/** Remove Object from cache.*/
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void removeFromObjectCache(const std::string& fileName);
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/** Get an ref_ptr<Object> from the object cache*/
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osg::ref_ptr<osg::Object> getRefFromObjectCache(const std::string& fileName);
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/** Check if an object is in the cache, and if it is, update its usage time stamp. */
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bool checkInObjectCache(const std::string& fileName, double timeStamp);
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/** call releaseGLObjects on all objects attached to the object cache.*/
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void releaseGLObjects(osg::State* state);
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/** call node->accept(nv); for all nodes in the objectCache. */
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void accept(osg::NodeVisitor& nv);
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/** call operator()(osg::Object*) for each object in the cache. */
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template <class Functor>
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void call(Functor& f)
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{
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OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_objectCacheMutex);
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for (ObjectCacheMap::iterator it = _objectCache.begin(); it != _objectCache.end(); ++it)
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f(it->second.first.get());
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}
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/** Get the number of objects in the cache. */
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unsigned int getCacheSize() const;
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protected:
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virtual ~ObjectCache();
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typedef std::pair<osg::ref_ptr<osg::Object>, double > ObjectTimeStampPair;
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typedef std::map<std::string, ObjectTimeStampPair > ObjectCacheMap;
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ObjectCacheMap _objectCache;
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mutable OpenThreads::Mutex _objectCacheMutex;
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};
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}
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#endif
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