code: public static List<TechnologyReferenceTransformer> getTransformers(RuleLoaderContext ruleLoaderContext)
      {
          List<TechnologyReferenceTransformer> transformerList = new ArrayList<>();
          Iterable<TechnologyReferenceTransformerLoader> loaders = FurnaceHolder.getFurnace().getAddonRegistry()
                  .getServices(TechnologyReferenceTransformerLoader.class);
          loaders.forEach((loader) -> {
              transformerList.addAll(loader.loadTransformers(ruleLoaderContext));
          }
docs: Gets the transformers for the given graph context, or loads them if necessary.