class InMemoryUserMaster extends AbstractInMemoryMaster<ManageableUser> implements UserMaster {

  @Override
  public ManageableUser getById(ObjectId objectId) {
    ArgumentChecker.notNull(objectId, "objectId");
    return super.getById(objectId);
  }

  public  InMemoryUserMaster();
  public  InMemoryUserMaster(final ObjectIdSupplier objectIdSupplier);
  public  InMemoryUserMaster(final ObjectIdSupplier objectIdSupplier, final ChangeManager changeManager);

}