just want to save the state of your program to a file
and re-spawn a new copy of self with this new data.
my ($state_file) = SaveToStateFile();
if (!RespawnFromStateFile($state_file)) # I.E. 0 == no
warn "Could not reload $0 properly.\n";
This will prevent you from crashing your program if you
break your class file (i.e. typo, compile error, etc.)
and it will give you a chance to fix it properly.
Of course, if you're inside of mod_perl
(0) will be futile, since mod_perl doesn't care
about that sort of stuff and will just call the same
program again for the next request.