Implement generic caching system
Andrei Kortunov
6 years ago
parent
ddcdbccd84
commit
2ed05a5195
@ -1,165 +0,0 @@
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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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#include "objectcache.hpp"
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#include <osg/Object>
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#include <osg/Node>
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namespace Resource
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{
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////////////////////////////////////////////////////////////////////////////////////////////
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//
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// ObjectCache
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//
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ObjectCache::ObjectCache():
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osg::Referenced(true)
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{
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}
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ObjectCache::~ObjectCache()
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{
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}
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void ObjectCache::addEntryToObjectCache(const std::string& filename, osg::Object* object, double timestamp)
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{
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if (!object)
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{
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OSG_ALWAYS << " trying to add NULL object to cache for " << filename << std::endl;
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return;
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}
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OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_objectCacheMutex);
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_objectCache[filename]=ObjectTimeStampPair(object,timestamp);
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}
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osg::ref_ptr<osg::Object> ObjectCache::getRefFromObjectCache(const std::string& fileName)
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{
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OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_objectCacheMutex);
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ObjectCacheMap::iterator itr = _objectCache.find(fileName);
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if (itr!=_objectCache.end())
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{
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return itr->second.first;
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}
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else return 0;
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}
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bool ObjectCache::checkInObjectCache(const std::string &fileName, double timeStamp)
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{
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OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_objectCacheMutex);
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ObjectCacheMap::iterator itr = _objectCache.find(fileName);
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if (itr!=_objectCache.end())
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{
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itr->second.second = timeStamp;
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return true;
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}
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else return false;
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}
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void ObjectCache::updateTimeStampOfObjectsInCacheWithExternalReferences(double referenceTime)
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{
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OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_objectCacheMutex);
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// look for objects with external references and update their time stamp.
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for(ObjectCacheMap::iterator itr=_objectCache.begin();
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itr!=_objectCache.end();
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++itr)
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{
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// If ref count is greater than 1, the object has an external reference.
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// If the timestamp is yet to be initialized, it needs to be updated too.
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if (itr->second.first->referenceCount()>1 || itr->second.second == 0.0)
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{
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// So update it.
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itr->second.second = referenceTime;
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}
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}
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}
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void ObjectCache::removeExpiredObjectsInCache(double expiryTime)
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{
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std::vector<osg::ref_ptr<osg::Object> > objectsToRemove;
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{
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OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_objectCacheMutex);
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// Remove expired entries from object cache
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ObjectCacheMap::iterator oitr = _objectCache.begin();
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while(oitr != _objectCache.end())
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{
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if (oitr->second.second<=expiryTime)
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{
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objectsToRemove.push_back(oitr->second.first);
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_objectCache.erase(oitr++);
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}
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else
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{
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++oitr;
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}
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}
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}
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// note, actual unref happens outside of the lock
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objectsToRemove.clear();
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}
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void ObjectCache::removeFromObjectCache(const std::string& fileName)
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{
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OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_objectCacheMutex);
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ObjectCacheMap::iterator itr = _objectCache.find(fileName);
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if (itr!=_objectCache.end()) _objectCache.erase(itr);
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}
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void ObjectCache::clear()
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{
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OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_objectCacheMutex);
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_objectCache.clear();
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}
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void ObjectCache::releaseGLObjects(osg::State* state)
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{
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OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_objectCacheMutex);
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for(ObjectCacheMap::iterator itr = _objectCache.begin();
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itr != _objectCache.end();
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++itr)
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{
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osg::Object* object = itr->second.first.get();
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object->releaseGLObjects(state);
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}
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}
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void ObjectCache::accept(osg::NodeVisitor &nv)
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{
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OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_objectCacheMutex);
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for(ObjectCacheMap::iterator itr = _objectCache.begin();
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itr != _objectCache.end();
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++itr)
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{
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osg::Object* object = itr->second.first.get();
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if (object)
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{
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osg::Node* node = dynamic_cast<osg::Node*>(object);
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if (node)
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node->accept(nv);
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}
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}
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}
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unsigned int ObjectCache::getCacheSize() const
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{
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OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_objectCacheMutex);
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return _objectCache.size();
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}
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}
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@ -1,46 +0,0 @@
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#include "resourcemanager.hpp"
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#include "objectcache.hpp"
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namespace Resource
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{
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ResourceManager::ResourceManager(const VFS::Manager *vfs)
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: mVFS(vfs)
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, mCache(new Resource::ObjectCache)
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, mExpiryDelay(0.0)
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{
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}
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ResourceManager::~ResourceManager()
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{
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}
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void ResourceManager::updateCache(double referenceTime)
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{
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mCache->updateTimeStampOfObjectsInCacheWithExternalReferences(referenceTime);
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mCache->removeExpiredObjectsInCache(referenceTime - mExpiryDelay);
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}
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void ResourceManager::clearCache()
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{
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mCache->clear();
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}
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void ResourceManager::setExpiryDelay(double expiryDelay)
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{
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mExpiryDelay = expiryDelay;
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}
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const VFS::Manager* ResourceManager::getVFS() const
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{
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return mVFS;
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}
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void ResourceManager::releaseGLObjects(osg::State *state)
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{
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mCache->releaseGLObjects(state);
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}
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}
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