code: public void viewAccepted(View new_view) {
          List<Address> new_mbrs=new_view.getMembers();
  
          if(new_mbrs != null) {
              sendViewChangeNotifications(new_view, new_mbrs, new ArrayList<>(members)); // notifies observers (joined, left)
              members.clear();
              members.addAll(new_mbrs);
          }
      }
docs: /*------------------- Membership Changes ----------------------