in reply to Controlling the start and endings of method calls

What you're looking for is something that for instance Hook::WrapSub provides. Other similar modules include Class::Hook, but there are many more. Searching on "Hook" gives you enough to get, err, dizzy ;)

The documentation for Hook::WrapSub has some suggestions that apply directly to your requirements: 

use Hook::WrapSub qw( wrap_subs );

wrap_subs \&before, 'some_func', 'another_func', \&after;

sub before {
    croak "No arguments allowed!" if @_;  

    # but if you're wrapping object methods, you might want to take
    # the object reference (i.e. $self) into account:
    # croak "No arguments allowed" if @_ > 1;
}

sub after {
    print "Always the same <html>...";
}

# your subs follow

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