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	}
      }
    } elsif ($count == 0) {
      $msg = "**Entry not found in master - adding**:\n".$entry->dump."\n";
      if ($args{debug}) {print $msg}
      if ($args{msg_function}) {&{$args{msg_function}}($msg)}
      $master->add($entry) || croak $master->code;;
    } else {croak "Error: entry matched multiple entries in master!\n"}
  }
  $msg = "Truncating slave\n";
  if ($args{debug}) {print $msg}
  if ($args{msg_function}) {&{$args{msg_function}}($msg)}
  $slave->truncate;
  $master->reset;
  $msg = "Adding master's records to slave\n";
  if ($args{debug}) {print $msg}
  if ($args{msg_function}) {&{$args{msg_function}}($msg)}
  while ($entry = $master->read) {
    $slave->write($entry);
  }
}

=head2 search

  $abook->search(attr=>\%filter);
  while ($entry=$abook->read) {
    print $entry->dump;
  }

\%filter is a list of cannonical attribute/value pairs. 

=cut

sub search {
  my $self = shift;
  my $class = ref $self || croak "Not a method call.";

  carp "Method not implemented."
}

=head2 read

  $entry=$abook->read;

Returns an AddressBook::Entry object

=cut

sub read {
  my $self = shift;
  my $class = ref $self || croak "Not a method call.";

  carp "Method not implemented"
}

=head2 update

  $abook->update(filter=>\%filter,entry=>$entry)

\%filter is a list of cannonical attriute/value pairs used to identify the entry to
be updated.

$entry is an AddressBook::Entry object

=cut

sub update {
  my $self = shift;
  my $class = ref $self || croak "Not a method call.";

  carp "Method not implemented"
}

=head2 add

  $abook->add($entry)

$entry is an AddressBook::Entry object

=cut

sub add {
  my $self = shift;
  my $class = ref $self || croak "Not a method call.";

  carp "Method not implemented"
}

=head2 delete

  $abook->delete($entry)

$entry is an AddressBook::Entry object

=cut

sub delete {
  my $self = shift;
  my $class = ref $self || croak "Not a method call.";

  carp "Method not implemented"
}

=head2 truncate

  $abook->truncate

Removes all records from the database.

=cut

sub truncate {
  my $self = shift;
  my $class = ref $self || croak "Not a method call.";

  carp "Method not implemented"
}

=head2 get_attribute_names 

  @names = $abook->get_attribute_names;