Skip to content


Subversion checkout URL

You can clone with
Download ZIP
Fetching contributors…
Cannot retrieve contributors at this time
126 lines (99 sloc) 3.97 KB
#!/usr/bin/perl -w -I..
# $Id$
# This is a simple test of "package sessions". These are similar to
# object sessions, but they work with packages instead of objects. It
# is also a simpler test than sessions.perl.
use strict;
use lib '../lib';
use POE;
# Counter is a package composed of event handler functions. It is
# never instantiated as an object here.
package Counter;
use strict;
use POE::Session;
# stupid scope trick, part 1 of 3
$Counter::name = '';
# This is a normal subroutine, not an object method. It sets up the
# session's variables and sets the session in motion.
sub _start {
my ($kernel, $session, $heap) = @_[KERNEL, SESSION, HEAP];
# register a signal handler
$kernel->sig('INT', 'sigint');
# initialize the counter
$heap->{'counter'} = 0;
# stupid scope trick, part 2 of 3
$heap->{'name'} = $Counter::name;
# hello, world!
print "Session $heap->{'name'} started.\n";
# start things moving
$kernel->post($session, 'increment');
# This is a normal subroutine, not an object method. It cleans up
# after receiving POE's standard _stop event.
sub _stop {
my $heap = $_[HEAP];
print "Session $heap->{'name'} stopped after $heap->{'counter'} loops.\n";
# This is a normal subroutine, and not an object method. It will be
# registered as a SIGINT handler so that the session can acknowledge
# the signal.
sub sigint {
my ($heap, $from, $signal_name) = @_[HEAP, SENDER, ARG0];
print "$heap->{'name'} caught SIG$signal_name from $from\n";
# did not handle the signal
return 0;
# This is a normal subroutine, and not an object method. It does most
# of the counting work. It loops by posting events back to itself.
# The session exits when there is nothing left to do; this event
# handler causes that condition when it stops posting events.
sub increment {
my ($package, $kernel, $session, $heap) = @_[OBJECT, KERNEL, SESSION, HEAP];
if ($heap->{counter} % 2) {
$kernel->state('runtime_state', $package);
else {
print "Session $heap->{'name'}, iteration $heap->{'counter'}.\n";
if ($heap->{'counter'} < 5) {
$kernel->post($session, 'increment');
$kernel->yield('runtime_state', $heap->{counter});
else {
# no more events. since there is nothing left to do, the session exits.
# This state is added on every even count. It's removed on every odd
# one. Every count posts an event here.
sub runtime_state {
my ($session, $heap, $iteration) = @_[SESSION, HEAP, ARG0];
print( 'Session ', $heap->{name},
' received a runtime_state event during iteration ',
$iteration, "\n"
# Create ten Counter sessions, all sharing the subs in package
# Counter. In a way, POE's sessions provide a simple form of object
# instantiation.
package main;
foreach my $name (qw(one two three four five six seven eight nine ten)) {
# stupid scope trick, part 3 of 3
$Counter::name = $name;
# create the session
package_states => [
Counter => [ qw(_start _stop increment sigint) ]
Jump to Line
Something went wrong with that request. Please try again.