code: private static void registerInterceptor(IInterceptorGroup interceptorGroup) {
          markRegisteredByPlugin();
          if (interceptorGroup != null) {
              interceptorGroup.loadInto(Warehouse.interceptorsIndex);
          }
      }
docs: method for arouter-auto-register plugin to register Interceptors
  @param interceptorGroup IInterceptorGroup implementation class in the package: com.alibaba.android.arouter.core.routers
  @author billy.qi <a href="mailto:qiyilike@163.com">Contact me.</a>
  @since 2017-12-06