my $filename = '/var/lib/some_dir/sume_subdir/filename';

##</code><code>##

my $nspace = $filename;
$nspace =~ s/[^a-zA-Z]/_/g;

##</code><code>##

$nspace= "ROOT::NameSpace::$nspace";

##</code><code>##

open FILE, $filename or die $!;
my @content = <FILE>;
close FILE;

##</code><code>##

my $eval = qq~package $nspace; 
sub handler { 
   local $0 = $filename;~ . join('', @content);

##</code><code>##

eval $eval;
die $@ if $@; # will die if there are any compile time errors.

##</code><code>##

my $codevector_name = join '::', $nspace, 'handler';
my $codevector = &\{ $codevector_name };
eval { $codevector->(@_) }; # pass arguments to the handler
die $@ if $@