package MyApp::ControllerOne;
use base 'MyApp::Base';

$self->sis->add_event("event name");
$self->sis->log_event("message");
$self->sis->uuid();

package MyApp::Base;
use base 'CGI::Application';
 
sub sis {
    my $self = shift;
    unless ( $self->{__sis} ) {
        $self->{__sis} = Company::Dept->new($dbh, $uname);
    }
    return $self->{__sis};
}

##</code><code>##

package Company::Dept;

sub new {
	my $class = shift;
	my $self = {};
	my ($dbh, $uname) = @_;
	$self->{ __dbh } = $dbh;
	$self->{ __uname } $uname;
	bless ($self, $class);
	return $self;
}

sub log_event {
	my ($self, $msg) = @_
	unless ( $self->{__elog} ) {
		$self->{__elog} = Company::Dept::EventLogging->new( $self->dbh, $self->uuid ) ;
	}
	$self->{__elog}->log_event( $msg );
}	

sub add_event {
	my ($self, $msg) = @_
	unless ( $self->{__elog} ) {
		$self->{__elog} = Company::Dept::EventLogging->new($self->dbh, $self->uuid ) ;
	}
	$self->{__elog}->add_event( $msg );
}

sub uuid { 
	my $self = shift;
	unless ( $self->{__uuid} ) {
		$self->{__uuid} = Company::Dept::UUID->uuid($self->dbh, $uuid ) ;
	}
	return $self->{__uuid} ;
}

sub dbh { return $self->{__dbh} }
sub uname {return $self->{__uname}  }

##</code><code>##

package Company::Dept::EventLogging;

sub add_event { }
sub log_event { }

package Company::Dept::AnotherUtilityModule;

sub aaa { }
sub bbb {}