1.
POE
Stefano Rodighiero
OpenExp 2006

2.
Perl
Object
Environment
POE - A Perl Object Environment

3.
?
POE - A Perl Object Environment

4.
Framework
POE - A Perl Object Environment

5.
Event
driven
POE - A Perl Object Environment

6.
Multitasking
Cooperativo
POE - A Perl Object Environment

7.
Single
thread
POE - A Perl Object Environment

8.
Networking
POE - A Perl Object Environment

9.
System
administration
POE - A Perl Object Environment

10.
GUI
POE - A Perl Object Environment

11.
POE - A Perl Object Environment

12.
Component
Wheel
“Architettura”
Session
Kernel
POE - A Perl Object Environment

13.
Component
Wheel
Dispatch di eventi
Session
Kernel
POE - A Perl Object Environment

14.
Component
Wheel
Risponde agli eventi
Session
Kernel
POE - A Perl Object Environment

15.
Component
“Plugin” per sessioni,
incapsula insiemi di
Wheel
gestori di eventi
Session POE::Wheel::FollowTail
POE::Wheel::Run
Kernel
POE - A Perl Object Environment

16.
Component
Wheel POE::Component::IRC
POE::Component::Server::TCP
POE::Component::Server::SimpleHTTP
…CPAN…
Session
Kernel
POE - A Perl Object Environment

17.
POE - A Perl Object Environment

18.
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

19.
sub POE::Kernel::TRACE_EVENTS() { 1 }
POE - A Perl Object Environment

20.
use POE;
POE - A Perl Object Environment

21.
for ( 1 .. 3 ) {
POE::Session -> create(
inline_states => {
_start => sub { print quot;Start!nquot; },
_stop => sub { print quot;Stop!nquot; }
} );
}
POE - A Perl Object Environment

22.
POE::Kernel->run();
POE - A Perl Object Environment

23.
_start
Session
Kernel
POE - A Perl Object Environment

24.
_start
Session
_start =>
sub {
print quot;Start!nquot;
Kernel
}
POE - A Perl Object Environment

25.
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

26.
Passaggio di messaggi
post()/yield()
POE - A Perl Object Environment

27.
Passaggio di messaggi
call()
POE - A Perl Object Environment

28.
Comunicazione
tra sessioni
POE - A Perl Object Environment

29.
# Sessione Babbo Natale
POE::Session->create(
inline_states => {
_start => sub {
print quot;Oh oh oh!nquot;;
$poe_kernel->alias_set( quot;Santaquot; );
},
lettera => sub {
print quot;Lettera da quot;
. $poe_kernel->alias_list( $_[SENDER] );
}
}
);
POE - A Perl Object Environment

30.
# Sessione Babbo Natale
POE::Session->create(
inline_states => {
_start => sub {
print quot;Oh oh oh!nquot;;
$poe_kernel->alias_set( quot;Santaquot; );
},
lettera => sub {
print quot;Lettera da quot;
. $poe_kernel->alias_list( $_[SENDER] );
}
}
);
POE - A Perl Object Environment

31.
# Sessione Babbo Natale
POE::Session->create(
inline_states => {
_start => sub {
print quot;Oh oh oh!nquot;;
$poe_kernel->alias_set( quot;Santaquot; );
},
lettera => sub {
print quot;Lettera da quot;
. $poe_kernel->alias_list( $_[SENDER] );
}
}
);
POE - A Perl Object Environment

32.
# Sessione Babbo Natale
POE::Session->create(
inline_states => {
_start => sub {
print quot;Oh oh oh!nquot;;
$poe_kernel->alias_set( quot;Santaquot; );
},
lettera => sub {
print quot;Lettera da quot;
. $poe_kernel->alias_list( $_[SENDER] );
}
}
);
POE - A Perl Object Environment

33.
# Sessione bimbo
POE::Session->create(
inline_states => {
_start => sub {
$poe_kernel->alias_set( quot;Paolinoquot; );
$poe_kernel->post( quot;Santaquot; => 'lettera' );
},
}
);
POE - A Perl Object Environment

34.
# Sessione bimbo
POE::Session->create(
inline_states => {
_start => sub {
$poe_kernel->alias_set( quot;Paolinoquot; );
$poe_kernel->post( quot;Santaquot; => 'lettera' );
},
}
);
POE - A Perl Object Environment

35.
Babbo Natale _start
Kernel
Paolino
_start
POE - A Perl Object Environment

36.
Babbo Natale
Kernel
Paolino
post( quot;Santaquot;, quot;letteraquot; )
POE - A Perl Object Environment

37.
lettera
Babbo Natale
Kernel
Paolino
POE - A Perl Object Environment

38.
lettera
Babbo Natale
lettera
Kernel
Paolino
post( quot;Santaquot;, quot;letteraquot; )
POE - A Perl Object Environment

39.
POE - A Perl Object Environment

40.
Wheel
POE - A Perl Object Environment

41.
Insiemi di
gestori di
eventi
POE - A Perl Object Environment

42.
POE::
Wheel::
FollowTail
POE - A Perl Object Environment

43.
use POE qw(