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#!/usr/local/bin/perl -w |
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# |
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# This script is an example of a primary/backup architecture. It is meant to be ran with the example named "two.pl". |
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# I like to run one.pl in one window and then two.pl in another and watch them battle it out. Normally one.pl, which |
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# is the bully in this case because of the higher priority number, would always be elected and two.pl would never do |
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# anything but send election requests and get denied. To make things a little more interesting I made one.pl take |
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# a short vacation so that two.pl could get a chance to do something. Enjoy! |
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# |
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# $Id: one.pl,v 1.0 2002-06-03 15:37:19+02 amo Exp amo $ |
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# |
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|
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use strict; |
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|
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use POE::Component::Election::Bully; |
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use POE; |
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|
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# these are the nodes participating in the election process |
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my $node1 = new POE::Component::Election::Bully::Node(['127.0.0.1', 5122, 1]); |
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|
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my $n = 0; |
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|
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POE::Session->create |
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( inline_states => |
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{ |
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_start => \&start_session, |
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_stop => sub { print "Session finished\n" }, |
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elected1 => \&election_results, |
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coup1 => sub { |
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print "Session 1 has been overthrown!\n"; |
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$_[KERNEL]->delay('do_work1'); |
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}, |
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do_work1 => \&do_work1, |
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vacation => sub { |
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# make sure that we retire before we work too much |
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if (++ $n < 5) { |
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print "It's time for a vacation!\n"; |
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$_[KERNEL]->delay('do_work1'); |
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$_[KERNEL]->post('component1', 'stop_election'); |
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$_[KERNEL]->delay_add('_start', 15); |
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} |
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else { |
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print "It's time to retire.....later.\n"; |
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$_[KERNEL]->delay('do_work1'); |
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$_[KERNEL]->post('component1', 'stop_election'); |
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} |
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}, |
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} |
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); |
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|
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$poe_kernel->run(); |
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|
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exit; |
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|
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|
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#--- States |
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|
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sub start_session { |
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print "election starting\n"; |
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|
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POE::Component::Election::Bully->new |
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( Alias => 'component1', |
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Port => 5121, |
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Priority => 2, |
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ElectionState => 'elected1', |
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CoupState => 'coup1', |
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RestartTimer => 3, |
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NotifyTimer => 3, |
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); |
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|
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$_[KERNEL]->post('component1', 'start_election', $node1); |
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} |
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|
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sub election_results { |
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print "Session 1 has been elected!\n"; |
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$_[KERNEL]->delay_add('do_work1', 5); |
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$_[KERNEL]->delay_add('vacation', 12, 5); |
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} |
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|
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sub do_work1 { |
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print "Session 1 doing some work while elected\n"; |
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$_[KERNEL]->delay_add('do_work1', 5); |
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} |
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|
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|
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__END__ |
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