The document discusses the Perl event framework POE (Pumpkin Onion Engine). It provides an overview of POE's components including the Kernel, Sessions, Wheels, and Components. It also presents two case studies - a ping multipler application that uses the POE::Component::Client::Ping component, and an IRC bot that uses the POE::Component::IRC component. The document demonstrates how POE allows building event-driven and multithreaded applications using these reusable POE components.

1. POE
Edgar Allan POE... POEtry ... Panel Of Experts ... Parallel Object Executor ... Parcel Out Execution ... Parenthetically Over-
Engineered ... Parity Of Evil ... Part Of Elephant ... Particles Of Eternity ... Party On, Ebenezer ... Passed Out from Excitement ...
Pathetically Over-Engineered ... Peace On Earth ... People Of Earth ... Perfect Orange Eater ... Perfectly Oblique Eggplant ...
Periodically Orbits Earth ... Perl Obfuscation Engine ... Perl Object Environment ... Perl Objects for Enterprises ... Perl Objects for
Events ... Perl On Extasy ... Perl Operating Environment ... Perl Operator Extravaganza ... Perl Over Easy ... Perl Over Ethernet ... Perl
Overdrive Engine ... Perl, Objects and Events ... Perl: Objectively Excellent ... Perlmud Offers Expansions ... Perpetual Orgone
Energy ... Persistent Object Environment ... Persnickity Oblong Erudition ... Perversely Oriented Entities ... Philanthropic
Organization Enterprises ... Physician Order Entry ... Piece Of Eden ... Piece Of Eight ... Pigs, Owls, and Elephants ... Piles Of Eugh ...
Pious Object Excelsior ... Piracy Over Ethernet ... Pissed Off Elephants ... Plain Old English ... Plastic Orbs Everywhere ... Platonic
Object Engine ... Plenty Of Everything ... Plucky Object Engine ... Poe Oracle Environment ... Poe Organizes Everything ... Poe Over
Earth ... Point Of Entry ... Polyolester ... Port of Embarkment ... Portal Of Evil ... Possibly Over-Engineered ... Post-Occupancy
Evaluation ... Potatoes Of Eternity ... Potentially Omnipotent Entity ... Pow! Oof! Eek! ... Power Operating Environment ... Power Over
Ethernet ... Practical Over Extraction ... Practically Overengineered Environment ... Preponderance of Evidence ... Preserve Our
Essences ... Pretty Obelisk, Excavated ... Pretty Obfuscation Engine ... Pretty Obtuse Engine ... Pretty Odd Environment ... Price Of
Entity ... Princess On Ecstasy ... Probable Obese Elephant ... Product Of Experts ... Products Of Eccentricity ... Prognosis: Over-
Engineered ... Program Office Estimate ... Programming Over Easy ... Proliferation Of Events ... Prolifically Over-Eaten ... Purity Of
Essence ... Purveyor Of Everything ...
YAPC::Brasil::2009
Thiago Rondon

2. FRAMEWORK

3. EVENT DRIVEN

4. MULTITASKING

5. FORKING &
THREADING ?

6. AD-HOC EVENTS

7. DISTRIBUTED
PROGRAMMING
::IKC

8. TESTED SYSTEM
1998-2000.........

9. GROWING
TOOLBOX

10. Layer 3 POE::Component
POE::
Layer 2
[Wheel,Filter,Driver]
POE::Session
Layer 1
POE::Kernel

11. COMPONENT POE::Kernel
Disparador de eventos,
WHEEL
POE::Loop::Select
SESSION Singleton
Post & yield
KERNEL
Timers

12. COMPONENT POE::Session
WHEEL Responde aos eventos
$_[OBJECT]
$_[SESSION]
SESSION
$_[HEAP]
$_[STATE]
KERNEL $_[SENDER]
$_[ARG0..ARG9]

13. COMPONENT POE::Wheel
“Plugins” para a sessão.
WHEEL Encapsular conjuntos de
manipuladores de eventos.
SESSION #Exemplo: POE::Wheel::Run
#Executa um programa ou um conjunto de
código em um subprocesso usando fork() e
troca informações pelo stdin, stdout, stderr.
KERNEL

14. COMPONENT POE::Component
564 componentes no
WHEEL CPAN até ontem.
(30/Outubro/2009)
SESSION POE::Component::IRC,
POE::Component::Server::Radius
POE::Component::Server::TCP
POE::Component::Server::HTTP
POE::Component::Github
KERNEL POE::Component::Jabber
(...)

15. ESTUDO DE
CASOS

16. “Ping Múltiplo”

17. use POE;
use POE::Component::Client::Ping;
my @addresses = qw(200.219.201.245
200.219.201.246 200.219.201.247);
POE::Component::Client::Ping->spawn(
Alias => 'pinger',
Timeout => 5, SESSION
);
POE::Session->create( COMPONENT
inline_states => {
_start => &client_start,
pong => &client_got_pong,
}
);

18. sub client_start {
my ($kernel, $session) =
@_[KERNEL, SESSION];
print "Starting to ping hosts.n";
foreach my $address (@addresses) {
$kernel->post(
pinger => ping => pong => $address);
}
}

19. sub client_got_pong {
my ($kernel, $session) = @_[KERNEL, SESSION];
my $request_packet = $_[ARG0];
my ($request_packetest_address, $request_timeout, $request_time) =
@{$request_packet};
my $response_packet = $_[ARG1];
my ($response_address, $roundtrip_time, $reply_time) =
@{$response_packet};
if (defined $response_address) {
printf("Pinged %-15.15s - Response from %-15.15s in %6.3fsn",
$request_address, $response_address, $roundtrip_time);
}
else {
print "Time's up for responses from $request_address.n";
}
}

20. KERNEL
$poe_kernel->run();

21. IRC

22. #!/usr/bin/perl
use warnings;
use strict;
use POE;
use POE::Component::IRC;
my ($irc) = POE::Component::IRC->spawn();
POE::Session->create(
inline_states => {
_start => &bot_start,
irc_001 => &on_connect,
irc_public => &on_public,
},
);

23. #!/usr/bin/perl
use warnings; COMPONENT
use strict;
use POE;
use POE::Component::IRC;
my ($irc) = POE::Component::IRC->spawn();
POE::Session->create(
inline_states => {
_start => &bot_start,
irc_001 => &on_connect,
irc_public => &on_public,
},
);

24. #!/usr/bin/perl
use warnings; SESSION
use strict;
use POE;
COMPONENT
use POE::Component::IRC;
my ($irc) = POE::Component::IRC->spawn();
POE::Session->create(
inline_states => {
_start => &bot_start,
irc_001 => &on_connect,
irc_public => &on_public,
},
);

25. COMPONENT
sub bot_start {
$irc->yield(register => "all");
$irc->yield(
connect => {
Nick => 'maluco_yapc',
Username => 'maluco',
Ircname => 'YAPC Brasil 2009',
Server => 'irc.perl.org',
Port => '6667',
}
);
}

26. COMPONENT
sub on_connect {
$irc->yield(join => “#yapcbrasil”);
}

27. KERNEL COMPONENT
sub on_public {
my ($kernel, $who, $where, $msg) =
@_[KERNEL, ARG0, ARG1, ARG2];
my $nick = (split /!/, $who)[0];
my $channel = $where->[0];
my $ts = scalar localtime;
print " [$ts] <$nick:$channel> $msgn";
if (my ($response) = $msg =~ /^$nick (.+)/) {
$irc->yield(privmsg => $channel,
“estamos aqui.“);
}
}

28. KERNEL
$poe_kernel->run();

29. Rocco Caputo

30. http://poe.perl.org

31. Obrigado!
Thiago Rondon
thiago@aware.com.br
http://www.aware.com.br/