private void removeUser(String name, String surname, String phone) throws PersistenceException {
    if (dataStore != null) {
      dataStore.remove(new PhoneUser(name, surname, phone));
    } else {
      viewContext.removeInstanceData(name);
    }
  }
The view data store.
<code>null</code> indicates that the view properties should be used instead of the data store.
ambari-views/examples/phone-list-upgrade-view/src/main/java/org/apache/ambari/view/phonelist/PhoneListServlet.java