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package Simulation::DiscreteEvent; |
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use Moose; |
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use Module::Load; |
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use Simulation::DiscreteEvent::Event; |
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use namespace::clean -except => ['meta']; |
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our $VERSION = '0.09'; |
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=head1 NAME |
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Simulation::DiscreteEvent - module for discrete-event simulation |
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=head1 SYNOPSIS |
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use Simulation::DiscreteEvent; |
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=head1 DESCRIPTION |
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This module implements library for discrete-event simulation. Currently it is |
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beta quality, I do not plan any backward incompatible changes in interface, |
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but everything may happen. Please see L<Simulation::DiscreteEvent::Cookbook> |
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for information about using this module. |
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=head1 SUBROUTINES/METHODS |
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=head2 new |
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Creates simulation object. |
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=cut |
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sub BUILD { |
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my $self = shift; |
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$self->_time(0); |
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} |
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=head2 $self->time |
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Returns current model time. |
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=cut |
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has time => ( reader => 'time', writer => '_time', isa => 'Num' ); |
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has _servers => ( is => 'ro', isa => 'ArrayRef', default => sub { [] } ); |
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has _events => ( is => 'ro', isa => 'ArrayRef', default => sub { [] } ); |
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=head2 $self->schedule($time, $server, $event[, $message]) |
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Schedule event at I<$time> for I<$server>. I<$event> is a string that |
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defines event type. I<$message> is a message that will be passed to I<$server>'s |
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event handler. |
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=cut |
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sub schedule { |
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my ($self, $time, $server, $event_type, $message) = @_; |
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die "Can't schedule event in the past" if $time < $self->time; |
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my $event = Simulation::DiscreteEvent::Event->new( |
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time => $time, |
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server => $server, |
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type => $event_type, |
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message => $message |
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); |
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my $i=0; |
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for (@{$self->_events}) { |
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last if $_->time > $time; |
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$i++; |
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} |
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splice @{$self->_events}, $i, 0, $event; |
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1; |
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} |
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=head2 $self->send($server, $event[, $message]) |
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Schedule I<$event> for I<$server> to happen right now. |
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=cut |
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sub send { |
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my $self = shift; |
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$self->schedule($self->time, @_); |
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} |
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=head2 $self->add($server_class, %parameters) |
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Will create new object of class I<$server_class> and add it to model. |
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I<%parameters> are passed to the object constructor. Returns reference to the |
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created object. |
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=cut |
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sub add { |
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my $self = shift; |
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my $server_class = shift; |
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{ |
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no strict 'refs'; |
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load $server_class unless @{"${server_class}::ISA"}; |
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} |
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my $srv = $server_class->new( model => $self, @_ ); |
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push @{$self->_servers}, $srv; |
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return $srv; |
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} |
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=head2 $self->run([$stop_time]) |
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Start simulation. You should schedule at least one event before run simulation. |
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Simulation will be finished at I<$stop_time> if specified, or when there will |
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be no more events scheduled for execution. |
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=cut |
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sub run { |
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my $self = shift; |
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my $stop_time = shift; |
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my $counter; |
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while ( my $event = shift @{ $self->_events } ) { |
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if ( $stop_time && $stop_time < $event->time ) { |
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unshift @{ $self->_events }, $event; |
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$self->_time($stop_time); |
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last; |
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} |
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$self->_time( $event->time ); |
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$event->handle; |
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$counter++; |
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} |
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$counter; |
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} |
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=head2 $self->step |
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Handles one event from the events queue. |
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=cut |
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sub step { |
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my $self = shift; |
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my $event = shift @{ $self->_events }; |
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return unless $event; |
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$self->_time( $event->time ); |
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$event->handle; |
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1; |
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} |
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1; |
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__END__ |
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=head1 AUTHOR |
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Pavel Shaydo, C<< <zwon at cpan.org> >> |
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=head1 BUGS |
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Please report any bugs or feature requests to C<bug-simulation-discreteevent at rt.cpan.org>, or through |
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the web interface at L<http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Simulation-DiscreteEvent>. I will be notified, and then you'll |
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automatically be notified of progress on your bug as I make changes. |
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=head1 SUPPORT |
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You can find documentation for this module with the perldoc command. |
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perldoc Simulation::DiscreteEvent |
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Project's git repository can be accessed at |
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http://github.com/trinitum/perl-Simulation-DiscreteEvent |
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167
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You can also look for information at: |
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=over 4 |
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=item * RT: CPAN's request tracker |
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173
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L<http://rt.cpan.org/NoAuth/Bugs.html?Dist=Simulation-DiscreteEvent> |
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175
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=item * AnnoCPAN: Annotated CPAN documentation |
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177
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L<http://annocpan.org/dist/Simulation-DiscreteEvent> |
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=item * CPAN Ratings |
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L<http://cpanratings.perl.org/d/Simulation-DiscreteEvent> |
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=item * Search CPAN |
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185
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L<http://search.cpan.org/dist/Simulation-DiscreteEvent/> |
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=back |
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=head1 LICENSE AND COPYRIGHT |
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Copyright 2010 Pavel Shaydo. |
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This program is free software; you can redistribute it and/or modify it |
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under the terms of either: the GNU General Public License as published |
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by the Free Software Foundation; or the Artistic License. |
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See http://dev.perl.org/licenses/ for more information. |
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=cut |
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