@Override
        public DataFetcher getResourceFetcher(Object model, int width, int height) {
            throw new NoSuchMethodError("This should never be called!");
        }
Maintains a map of model class to factory to retrieve a {@link ModelLoaderFactory} and/or a {@link ModelLoader}
for a given model type.
core/src/main/java/com/bumptech/glide/load/model/GenericLoaderFactory.java