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## ------------------------------------------------------------------------ |
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## $Id: LookupClient.pm,v 1.5 2003/07/01 18:13:15 joko Exp $ |
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## ------------------------------------------------------------------------ |
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## $Log: LookupClient.pm,v $ |
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## Revision 1.5 2003/07/01 18:13:15 joko |
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## fixed: shutdown and session-unaliasing seems to be done by gc now...? |
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## |
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## Revision 1.3 2003/07/01 13:13:44 joko |
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## made "port" and "host" configurable from script |
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## |
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## Revision 1.2 2003/07/01 13:05:01 joko |
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## major changes, tried to clean up shutdown phase - the watchdog-mech didn't work out well..... - what's about IKC's monitor? does it work on Linux? |
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## |
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## Revision 1.1 2003/06/29 01:35:29 joko |
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## initial commit |
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## |
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## ------------------------------------------------------------------------ |
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|
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|
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package POE::Component::LookupClient; |
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|
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use strict; |
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use warnings; |
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|
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use POE qw( Session Component::IKC::Client ); |
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use Data::Dumper; |
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|
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|
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sub new { |
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my $classname = shift; |
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my @args = @_; |
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|
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my $self = {}; |
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bless $self, $classname; |
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|
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$self->{options} = { @args }; |
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|
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#my $event_handler = lookupd->new(); |
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POE::Session->create( |
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object_states => [ |
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$self => [qw( _start _stop boot_intercom start_session waste_time watchdog )] |
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] |
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); |
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|
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} |
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|
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# This is not a POE method. It's a plain OO one. |
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sub debug { |
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my $self = shift; |
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my $msg = shift; |
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$msg ||= ''; |
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print STDERR __PACKAGE__ . ": " . $msg, "\n"; |
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} |
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|
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# Controller's event handlers |
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|
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sub _start { |
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my ( $self, $kernel, $heap ) = @_[ OBJECT, KERNEL, HEAP ]; |
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$self->debug("_start"); |
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|
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#$kernel->alias_set("controller"); |
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|
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#$kernel->post( controller => 'start_daemon' ); |
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#$kernel->yield( 'boot_storage' ); |
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$kernel->yield( 'boot_intercom' ); |
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#$_[HEAP]->{subsession} = POE::Session->create( inline_states => { _start => sub { print "WORKER!", "\n"; } } ); |
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#$_[HEAP]->{subsession}->yield( |
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|
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}; |
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|
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sub _stop { |
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my ( $self, $kernel, $heap ) = @_[ OBJECT, KERNEL, HEAP ]; |
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$self->debug("_stop"); |
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}; |
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|
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sub boot_intercom { |
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|
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my ( $self, $kernel, $heap ) = @_[ OBJECT, KERNEL, HEAP ]; |
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$self->debug("boot_intercom"); |
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|
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# Client component - encapsulates some session(s) and/or wheel(s)? |
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|
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$self->{options}->{host} ||= "localhost"; |
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$self->{options}->{port} ||= 30; |
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|
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#create_ikc_client( host => $host, port => 30, name => 'Client', on_connect => $self->{options}->{on_connect} ); |
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create_ikc_client( |
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ip => $self->{options}->{host}, |
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port => $self->{options}->{port}, |
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#name => 'Client', |
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#on_connect => sub { $self->build(); }, |
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on_connect => sub { $self->build(); }, |
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#subscribe => [qw( poe://LookupService/ServiceRegistrar )], |
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#subscribe => [qw( poe://LookupService/ServiceRegistrar )], |
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); |
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|
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#$kernel->post( IKC => 'monitor', '*' => { register => 'start_session' }); |
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#$kernel->post( IKC => 'monitor', 'LookupService' => { register => 'start_session' }); |
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#$kernel->post( IKC => 'subscribe', [qw( poe://LookupService/ServiceRegistrar )], 'poe:start_session' ); |
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|
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# start up the watchdog which monitors the required IKC intercom session |
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#$kernel->yield('waste_time'); |
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$kernel->delay('watchdog', 2); |
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|
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}; |
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|
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sub start_session { |
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#my $self = shift; |
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print STDERR "start_session", "\n"; |
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} |
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|
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sub build { |
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my $self = shift; |
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#print "build", "\n"; |
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# create sessions that depend on the foreign kernel. |
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POE::Component::LookupClient::Session->new(); |
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} |
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|
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sub watchdog { |
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my ( $self, $kernel, $heap ) = @_[ OBJECT, KERNEL, HEAP ]; |
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$self->debug("watchdog"); |
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|
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#$kernel->post( IKC => 'monitor', '*' => { register => 'start_session' }); |
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|
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if (not defined $kernel->alias_resolve('DeviceClient')) { |
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#if (not defined $kernel->alias_resolve('IKC')) { |
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print STDERR "Session died, trying to restart!", "\n"; |
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$kernel->yield('boot_intercom'); |
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return; |
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} |
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|
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$kernel->delay('watchdog', 2); |
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}; |
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|
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#------------------------------------------------------------------------------ |
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# This event keeps this POE kernel alive. |
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# (stolen from POE::Component::IKC::Server, but not used 'til now...) |
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sub waste_time { |
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my($kernel, $heap)=@_[KERNEL, HEAP]; |
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return if $heap->{'is a child'}; |
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|
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unless($heap->{'been told we are parent'}) { |
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warn "$$: Telling everyone we are the parent\n"; |
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$heap->{'been told we are parent'}=1; |
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$kernel->signal($kernel, '__parent'); |
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} |
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if($heap->{'die'}) { |
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#DEBUG and warn "$$: Orderly shutdown\n"; |
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} else { |
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$kernel->yield('watchdog'); |
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$kernel->delay('waste_time', 60); |
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} |
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return; |
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} |
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|
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|
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|
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|
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package POE::Component::LookupClient::Session; |
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|
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use strict; |
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use warnings; |
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|
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use POE qw( Session ); |
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use Data::Dumper; |
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|
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|
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sub new { |
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my $classname = shift; |
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my @args = @_; |
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|
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my $self = {}; |
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bless $self, $classname; |
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|
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$self->{options} = { @args }; |
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|
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POE::Session->create( |
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object_states => [ |
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$self => [qw( _start _stop on_response on_subscribe register_lease renew_lease remote_shutdown remote_timeout )] |
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] |
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); |
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|
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} |
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|
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|
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# This is not a POE method. It's a plain OO one. |
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sub debug { |
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my $self = shift; |
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my $msg = shift; |
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$msg ||= ''; |
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print STDERR __PACKAGE__ . ": " . $msg, "\n"; |
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} |
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|
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# Controller's event handlers |
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|
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sub _start { |
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my ( $self, $kernel, $heap ) = @_[ OBJECT, KERNEL, HEAP ]; |
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$self->debug("_start"); |
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|
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#$kernel->alias_set(''); |
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#$kernel->post(); |
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|
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#sub POE::Component::IKC::Responder::DEBUG { 1 } |
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#sub POE::Component::IKC::Responder::Object::DEBUG { 1 } |
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|
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# set up communication channel for asynchronous responses |
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$kernel->alias_set('DeviceClient'); |
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$kernel->post('IKC', 'publish', 'DeviceClient', [qw( on_response )]); |
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|
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#$kernel->post( IKC => 'subscribe', [qw( poe://LookupService/ServiceRegistrar )], 'poe:start_session' ); |
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|
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$kernel->post( IKC => 'subscribe', [qw( poe://LookupService/ServiceRegistrar )], 'on_subscribe' ); |
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|
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# try to register on startup? |
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#$kernel->yield('register_lease'); |
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|
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}; |
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|
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sub _stop { |
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my ( $self, $kernel, $heap ) = @_[ OBJECT, KERNEL, HEAP ]; |
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$self->debug("_stop"); |
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|
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# try to re-register if session dies? |
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#$kernel->yield('register_lease'); |
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|
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#$kernel->alias_remove('DeviceClient'); |
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|
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#$self = undef; |
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}; |
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|
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|
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# Subscription receipt callback, see "perldoc POE::Component::IKC::Responder". |
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sub on_subscribe { |
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my ( $self, $kernel, $heap ) = @_[ OBJECT, KERNEL, HEAP ]; |
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$self->debug("on_subscribe"); |
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# register lease on subscription |
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$kernel->yield('register_lease'); |
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} |
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|
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# Main response dispatcher, this should dispatch to local states programmatically. |
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sub on_response { |
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my ( $self, $kernel, $heap ) = @_[ OBJECT, KERNEL, HEAP ]; |
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#$self->debug("response"); |
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|
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$heap->{'cancel timeout'} = 1; |
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|
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my $payload = $_[ARG0]; |
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$payload ||= ''; |
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|
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# If registration succeeded, start the renewal cycle. |
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if ($payload eq 'REG_OK') { |
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$self->debug("Starting lease renewal loop."); |
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$kernel->post( IKC => 'monitor', '*' => { unregister => 'remote_shutdown' }); |
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$kernel->post( IKC => 'monitor', '*' => { shutdown => 'remote_shutdown' }); |
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$kernel->yield( 'renew_lease' ); |
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|
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} elsif ($payload eq 'LEASE_OK') { |
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$self->debug("Received 'LEASE_OK'."); |
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#$kernel->yield( 'renew_lease' ); |
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|
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# 1. otherwise dump anything sent to us for debugging purposes |
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# 2. destroy lease in any case on unknown payload |
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} else { |
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#print Dumper($payload); |
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$heap->{'destroy lease'} = 1; |
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#$kernel->alarm_remove_all(); |
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|
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} |
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|
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}; |
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|
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sub register_lease { |
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my ( $self, $kernel, $heap ) = @_[ OBJECT, KERNEL, HEAP ]; |
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$self->debug("register_lease"); |
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|
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my $ONE_arg = "Hello World!"; |
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|
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# V1 - without subscription |
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#$kernel->post('IKC', 'post', "poe://LookupService/ServiceRegistrar/register_lease", $ONE_arg); |
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# V2 - with subscription |
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$kernel->post( "poe://LookupService/ServiceRegistrar", "register_lease", $ONE_arg ); |
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} |
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|
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sub renew_lease { |
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my ( $self, $kernel, $heap ) = @_[ OBJECT, KERNEL, HEAP ]; |
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|
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if ($heap->{'destroy lease'}) { |
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#$heap->{'destroy lease'} = 0; |
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#$kernel->delay_set('remote_timeout'); |
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$self->debug("destroyed lease"); |
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#undef $self; |
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#$kernel->alias_remove('DeviceClient'); |
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#undef $_[SESSION]; |
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#$kernel->post( 'IKC' => 'shutdown' ); |
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# clear delayed posts |
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#$kernel->delay('renew_lease'); |
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#$kernel->delay('remote_timeout'); |
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return; |
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} |
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|
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$self->debug("renew_lease"); |
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|
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# check if remote kernel(s) are still around |
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#$kernel->post('IKC', 'call', 'poe://LookupService/IKC/ping', '', 'poe:remote_timeout'); |
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#$kernel->post('IKC', 'call', 'poe://LookupService/IKC/ping', undef, 'poe:remote_timeout'); |
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#$kernel->post('poe://remote/IKC', 'ping', 'poe:remote_timeout'); |
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#$kernel->delay('remote_timeout', 5); # timeout |
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|
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my $ONE_arg = ''; |
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#$kernel->post('IKC', 'post', "poe://LookupService/ServiceRegistrar/renew_lease", $ONE_arg); |
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# V1 - without subscription |
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$kernel->post('IKC', 'call', "poe://LookupService/ServiceRegistrar/renew_lease", $ONE_arg, 'poe:on_response'); |
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|
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# V2 - with subscription |
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#my $resp = $kernel->call( "poe://LookupService/ServiceRegistrar", "renew_lease", $ONE_arg); |
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#print $resp, "\n"; |
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|
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# V3 - have we been able to post? |
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#my $resp = $kernel->call('IKC', 'call', "poe://LookupService/ServiceRegistrar/renew_lease", $ONE_arg, 'poe:response'); |
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#print "resp: $resp", "\n"; |
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|
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# and again... |
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$kernel->delay('renew_lease', 5); |
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#$kernel->delay_set('renew_lease', 15); |
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#$kernel->delay_add('renew_lease', 15); |
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|
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# timeout!? |
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#$kernel->delay('remote_timeout', 20); |
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$kernel->delay_add('remote_timeout', 7); |
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#$kernel->delay_set('remote_timeout', 5); |
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#$kernel->delay_set('remote_timeout', 20); |
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|
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} |
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|
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sub remote_shutdown { |
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my ( $self, $kernel, $heap ) = @_[ OBJECT, KERNEL, HEAP ]; |
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$self->debug("remote_shutdown"); |
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} |
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|
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sub remote_timeout { |
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|
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#my ($pong) = $_[ARG0]; |
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#return if $pong; # all is cool |
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|
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my ($self, $kernel, $heap) = @_[OBJECT, KERNEL, HEAP]; |
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|
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#=pod |
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if ($heap->{'cancel timeout'}) { |
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$heap->{'cancel timeout'} = 0; |
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return; |
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} |
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#=cut |
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|
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$self->debug("remote_timeout"); |
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|
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$heap->{'destroy lease'} = 1; |
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|
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# YOW! Remote kernel timed out. RUN AROUND SCREAMING! |
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print STDERR "# YOW! Remote kernel timed out. RUN AROUND SCREAMING!", "\n"; |
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|
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# free all resources that keep this session running |
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$kernel->delay('renew_lease'); |
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$kernel->delay('remote_timeout'); |
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|
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#$kernel->post( 'IKC' => 'shutdown' ); |
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|
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#$kernel->alias_remove('DeviceClient'); |
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|
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#$kernel->alias_remove('DeviceClient'); |
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#$kernel->yield('renew_lease'); |
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|
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#sub POE::Component::IKC::Responder::DEBUG { return 1; } |
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#$kernel->post( 'IKC' => 'unregister' ); |
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|
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#print Dumper($kernel->alias_list()); |
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|
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$kernel->post( IKC => 'retract', 'DeviceClient' => [qw( on_response )]); |
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#$kernel->post( IKC => 'retract', 'me' => [qw( on_response )]); |
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$kernel->post( IKC => 'unsubscribe', [qw( poe://LookupService/ServiceRegistrar )]); |
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$kernel->post( IKC => 'unregister', [qw( poe://LookupService )]); |
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#$kernel->post( IKC => 'unsubscribe', [qw( poe://me )]); |
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#$kernel->post( IKC => 'unregister', [qw( poe://me )]); |
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#$kernel->run_one_timeslice(); |
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#$kernel->run_one_timeslice(); |
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#$kernel->run_one_timeslice(); |
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#return; |
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|
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#$kernel->post( 'IKC' => 'shutdown' ); |
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#$kernel->post( 'IKC' => 'blah' ); |
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#$kernel->run_one_timeslice(); |
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#$kernel->run_one_timeslice(); |
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|
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$kernel->post('DeviceClient', 'stop'); |
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|
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$kernel->alias_remove('DeviceClient'); |
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$kernel->alias_remove('IKC'); |
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|
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#$kernel->run_one_timeslice(); |
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#$kernel->run_one_timeslice(); |
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|
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#$kernel->yield('_start'); |
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|
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} |
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|
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1; |
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__END__ |
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