Federation Architecture

graph BT;
  webapp(Web app);
  iosapp(iOS app);
  subgraph " ";
  router([Graph router]);
  serviceA[Users
subgraph];
  serviceB[Products
subgraph];
  serviceC[Reviews
subgraph];
  end;
  webapp & iosapp -.- router;
  router --- serviceA & serviceB & serviceC;
  class webapp,iosapp secondary;