POE
Stefano Rodighiero
OpenExp 2006

Perl
Object
Environment
POE - A Perl Object Environment

?
POE - A Perl Object Environment

Framework
POE - A Perl Object Environment

Event
driven
POE - A Perl Object Environment

Multitasking
Cooperativo
POE - A Perl Object Environment

Single
thread
POE - A Perl Object Environment

Networking
POE - A Perl Object Environment

System
administration
POE - A Perl Object Environment

GUI
POE - A Perl Object Environment

POE - A Perl Object Environment

Component
Wheel
“Architettura”
Session
Kernel
POE - A Perl Object Environment

Component
Wheel
Dispatch di eventi
Session
Kernel
POE - A Perl Object Environment

Component
Wheel
Risponde agli eventi
Session
Kernel
POE - A Perl Object Environment

Component
“Plugin” per sessioni,
incapsula insiemi di
Wheel
gestori di eventi
Session POE::Wheel::FollowTail
POE::Wheel::Run
Kernel
POE - A Perl Object Environment

Component
Wheel POE::Component::IRC
POE::Component::Server::TCP
POE::Component::Server::SimpleHTTP
…CPAN…
Session
Kernel
POE - A Perl Object Environment

POE - A Perl Object Environment

Un programma tipico
• Istanzia una o più sessioni
• Esplicitamente, eventualmente usando
delle Wheel
• Implicitamente, con Componenti già
pronti
• POE::Kernel->run()
POE - A Perl Object Environment

sub POE::Kernel::TRACE_EVENTS() { 1 }
POE - A Perl Object Environment

use POE;
POE - A Perl Object Environment

for ( 1 .. 3 ) {
POE::Session -> create(
inline_states => {
_start => sub { print \"Start!\\n\" },
_stop => sub { print \"Stop!\\n\" }
} );
}
POE - A Perl Object Environment

POE::Kernel->run();
POE - A Perl Object Environment

_start
Session
Kernel
POE - A Perl Object Environment

_start
Session
_start =>
sub {
print \"Start!\\n\"
Kernel
}
POE - A Perl Object Environment

Passaggio di messaggi
Accoda un evento, da inoltrare
post() alla session specificata
Accoda un evento, da inoltrare
yield() alla session stessa
Invoca - in maniera
sincrona - un evento per una
call()
sessione specificata
POE - A Perl Object Environment

Passaggio di messaggi
post()/yield()
POE - A Perl Object Environment

Passaggio di messaggi
call()
POE - A Perl Object Environment

Comunicazione
tra sessioni
POE - A Perl Object Environment

# Sessione Babbo Natale
POE::Session->create(
inline_states => {
_start => sub {
print \"Oh oh oh!\\n\";
$poe_kernel->alias_set( \"Santa\" );
},
lettera => sub {
print \"Lettera da \"
. $poe_kernel->alias_list( $_[SENDER] );
}
}
);
POE - A Perl Object Environment

# Sessione Babbo Natale
POE::Session->create(
inline_states => {
_start => sub {
print \"Oh oh oh!\\n\";
$poe_kernel->alias_set( \"Santa\" );
},
lettera => sub {
print \"Lettera da \"
. $poe_kernel->alias_list( $_[SENDER] );
}
}
);
POE - A Perl Object Environment

# Sessione Babbo Natale
POE::Session->create(
inline_states => {
_start => sub {
print \"Oh oh oh!\\n\";
$poe_kernel->alias_set( \"Santa\" );
},
lettera => sub {
print \"Lettera da \"
. $poe_kernel->alias_list( $_[SENDER] );
}
}
);
POE - A Perl Object Environment

# Sessione Babbo Natale
POE::Session->create(
inline_states => {
_start => sub {
print \"Oh oh oh!\\n\";
$poe_kernel->alias_set( \"Santa\" );
},
lettera => sub {
print \"Lettera da \"
. $poe_kernel->alias_list( $_[SENDER] );
}
}
);
POE - A Perl Object Environment

# Sessione bimbo
POE::Session->create(
inline_states => {
_start => sub {
$poe_kernel->alias_set( \"Paolino\" );
$poe_kernel->post( \"Santa\" => 'lettera' );
},
}
);
POE - A Perl Object Environment

# Sessione bimbo
POE::Session->create(
inline_states => {
_start => sub {
$poe_kernel->alias_set( \"Paolino\" );
$poe_kernel->post( \"Santa\" => 'lettera' );
},
}
);
POE - A Perl Object Environment

Babbo Natale _start
Kernel
Paolino
_start
POE - A Perl Object Environment

Babbo Natale
Kernel
Paolino
post( \"Santa\", \"lettera\" )
POE - A Perl Object Environment

lettera
Babbo Natale
Kernel
Paolino
POE - A Perl Object Environment

lettera
Babbo Natale
lettera
Kernel
Paolino
post( \"Santa\", \"lettera\" )
POE - A Perl Object Environment

POE - A Perl Object Environment

Wheel
POE - A Perl Object Environment

Insiemi di
gestori di
eventi
POE - A Perl Object Environment

POE::
Wheel::
FollowTail
POE - A Perl Object Environment

use POE qw(
Wheel::FollowTail
);
POE - A Perl Object Environment

$|++
POE - A Perl Object Environment

POE::Session->create(
inline_states => {...
POE - A Perl Object Environment

_start => sub {
my $heap = $_[ HEAP ];
my $watcher = POE::Wheel::FollowTail->new(
Filename => 'logfile.log',
PollInterval => 1,
InputEvent => 'input_state'
);
$heap->{ watcher } = $watcher;
} , ...
POE - A Perl Object Environment

_start => sub {
my $heap = $_[ HEAP ];
my $watcher = POE::Wheel::FollowTail->new(
Filename => 'logfile.log',
PollInterval => 1,
InputEvent => 'input_state'
);
$heap->{ watcher } = $watcher;
} , ...
POE - A Perl Object Environment

_start => sub {
my $heap = $_[ HEAP ];
my $watcher = POE::Wheel::FollowTail->new(
Filename => 'logfile.log',
PollInterval => 1,
InputEvent => 'input_state'
);
$heap->{ watcher } = $watcher;
} , ...
POE - A Perl Object Environment

_start => sub {
my $heap = $_[ HEAP ];
my $watcher = POE::Wheel::FollowTail->new(
Filename => 'logfile.log',
PollInterval => 1,
InputEvent => 'input_state'
);
$heap->{ watcher } = $watcher;
} , ...
POE - A Perl Object Environment

_start => sub {
my $heap = $_[ HEAP ];
my $watcher = POE::Wheel::FollowTail->new(
Filename => 'logfile.log',
PollInterval => 1,
InputEvent => 'input_state'
);
$heap->{ watcher } = $watcher;
} , ...
POE - A Perl Object Environment

input_state => sub {
my $input = $_[ ARG0 ];
print $input;
}
POE - A Perl Object Environment

Session
__________
__________
__________
__________
__________
__________
Wheel
POE - A Perl Object Environment

Session
__________
__________
__________
input_event
__________
__________
__________
Wheel
POE - A Perl Object Environment

POE - A Perl Object Environment

POE
+ Test
+ IRC
POE - A Perl Object Environment

Testing?
POE - A Perl Object Environment

Failed 3/10
tests
?
Test IRC
POE - A Perl Object Environment

09:41 < Quinn> larsen: Avast!
Whoreson swab!
You failed 3/10 tests!
POE - A Perl Object Environment

?
Test IRC
POE - A Perl Object Environment

Session
POE::
Wheel::
__________ FollowTail
__________
__________
__________
__________
__________
POE::
Component::
IRC
POE - A Perl Object Environment

POE::
Component::
IRC
POE - A Perl Object Environment

use POE qw/ Wheel::FollowTail
Component::IRC
/;
POE - A Perl Object Environment

use Acme::Scurvy::Whoreson::BilgeRat;
POE - A Perl Object Environment

my $conf = {
nick => 'Quinn',
ircname => 'HAR!',
server => 'irc.freenode.net',
port => 6667
};
my $channel = '#scummbar';
POE - A Perl Object Environment

my $irc = POE::Component::IRC->spawn( %$conf )
or die \"HAR!!! $!\";
POE - A Perl Object Environment

POE::Session->create(
package_states => [
'main' => [ qw(
_default
_start
irc_001
irc_public
tell_results
) ],
],
heap => { irc => $irc }
);
POE - A Perl Object Environment

POE::Session->create(
package_states => [
'main' => [ qw(
_default
_start
irc_001
irc_public
tell_results
) ],
],
heap => { irc => $irc }
);
POE - A Perl Object Environment

POE::Session->create(
package_states => [
'main' => [ qw(
_default
_start
irc_001
irc_public
tell_results
) ],
],
heap => { irc => $irc }
);
POE - A Perl Object Environment

sub _start {
my ( $kernel, $heap ) = @_[ KERNEL, HEAP ];
my $watcher = POE::Wheel::FollowTail->new(
Filename => 'tests.log' ,
PollInterval => 1 ,
InputEvent => 'tell_results'
);
$heap->{ watcher } = $watcher;
my $irc_sess = $heap->{irc}->session_id();
$kernel->post( $irc_sess => register => 'all' );
$kernel->post( $irc_sess => connect => {} );
undef;
}
POE - A Perl Object Environment

sub _start {
my ( $kernel, $heap ) = @_[ KERNEL, HEAP ];
my $watcher = POE::Wheel::FollowTail->new(
Filename => 'tests.log' ,
PollInterval => 1 ,
InputEvent => 'tell_results'
);
$heap->{ watcher } = $watcher;
my $irc_sess = $heap->{irc}->session_id();
$kernel->post( $irc_sess => register => 'all' );
$kernel->post( $irc_sess => connect => {} );
undef;
}
POE - A Perl Object Environment

sub _start {
my ( $kernel, $heap ) = @_[ KERNEL, HEAP ];
my $watcher = POE::Wheel::FollowTail->new(
Filename => 'tests.log' ,
PollInterval => 1 ,
InputEvent => 'tell_results'
);
$heap->{ watcher } = $watcher;
my $irc_sess = $heap->{irc}->session_id();
$kernel->post( $irc_sess => register => 'all' );
$kernel->post( $irc_sess => connect => {} );
undef;
}
POE - A Perl Object Environment

sub irc_001 {
my ( $kernel, $sender ) =
@_[ KERNEL, SENDER ];
$kernel->post(
$sender => join => $channel );
undef;
}
POE - A Perl Object Environment

sub tell_results
{
my $kernel = $_[KERNEL];
my $heap = $_[HEAP];
my $line = $_[ARG0];
my $irc_session = $heap->{irc};
my ($failed, $total) = split qr|/|, $line;
if ($failed) {
my $insult = Acme::Scurvy::Whoreson::BilgeRat->new(
language => 'pirate'
);
$kernel->post(
$irc_session => privmsg =>
$channel => \"$insult! You failed $failed tests!\" );
}
}
}
POE - A Perl Object Environment

sub tell_results
{
my $kernel = $_[KERNEL];
my $heap = $_[HEAP];
my $line = $_[ARG0];
my $irc_session = $heap->{irc};
my ($failed, $total) = split qr|/|, $line;
if ($failed) {
my $insult = Acme::Scurvy::Whoreson::BilgeRat->new(
language => 'pirate'
);
$kernel->post(
$irc_session => privmsg =>
$channel => \"$insult! You failed $failed tests!\" );
}
}
}
POE - A Perl Object Environment

sub tell_results
{
my $kernel = $_[KERNEL];
my $heap = $_[HEAP];
my $line = $_[ARG0];
my $irc_session = $heap->{irc};
my ($failed, $total) = split qr|/|, $line;
if ($failed) {
my $insult = Acme::Scurvy::Whoreson::BilgeRat->new(
language => 'pirate'
);
$kernel->post(
$irc_session => privmsg =>
$channel => \"$insult! You failed $failed tests!\" );
}
}
}
POE - A Perl Object Environment

POE - A Perl Object Environment

• irc.freenode.net,#poe
• http://poe.perl.org
• “Advanced Perl
Programming” (O’Reilly) - Cap.7
• http://del.icio.us/slr/poe ☺
POE - A Perl Object Environment

• http://www.perl.it
• irc.freenode.net,#perl.it
• mongers@perl.it
POE - A Perl Object Environment

Grazie!
Stefano Rodighiero
larsen@perl.it