sub init_hash {
  my ($self) = @_;
  $self->{a_hash}{item1} = {name => 'a', value => '1'};
  $self->{a_hash}{item2} = {name => 'b', value => '2'};
  $self->{a_hash}{item3} = {name => 'c', value => '3'};
  $self->{a_hash}{item4} = {name => 'd', value => '4'};
  1;
}