#!/opt/perl/bin/perl
package test;
use Object::Event;
our @ISA = qw/Object::Event/;
sub new {
   my $c = shift;
   my $self = $c->SUPER::new (@_);
   # register on the 'up' event and then call the 'down' event
   $self->reg_cb (up => sub { $self->event ('down'); });
   $self
}
sub up {
   my ($self) = @_;
   $self->event ('up'); # genereate an internal up event
}
package main;
my $t = test->new;
$t->reg_cb ( # reg_cb registers on a set of specific events
   down => sub {
      my ($t) = @_;
      print "Yay, we got down again...\n";
   }
);
$t->up; # test will emit the 'down' even we registered upon above