bool MemCache::isCached(const osgEarth::TileKey& key, const CacheSpec& spec) const { OpenThreads::ScopedLock<OpenThreads::Mutex> lock( const_cast<MemCache*>(this)->_mutex); std::string id = key.str() + spec.cacheId(); return _keyToIterMap.find(id) != _keyToIterMap.end(); //osg::ref_ptr<osg::Image> image = getImage(key,spec); //return image.valid(); }