BEGIN { __PACKAGE__->load_config('path/to/my.conf') }

##</code><code>##

package BaseConf;

sub config_file_path { croak "must implemeted in subclass" }

sub load_config {
    my $self = shift;
    my $conf_file = $self->config_file_path;
    croak "unable to find $conf_file" unless -e $conf_file and -r $conf_file;

    my $cfg = Config::Tiny->read( $conf_file );
    croak "read config file '$conf_file' failed: $Config::Tiny::errstr" unless $cfg;
    return $cfg;
}

ub get {
    my $self = shift;
    my $cfg  = $self->load_config;
    croak "invalid method called $_[0]" if not exists $cfg->{_}->{ $_[0] };
    return $cfg->{_}->{ $_[0] };
}
sub import { ... } 
sub AUTOLOAD { .. } 

package MyConf;
use base 'BaseConf';

sub config_file_path { return "path/to/my.conf" }