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PARDUS / Zoidberg-0.1b-unstable / Monitor / Monitor.pm 

            

              
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package Zoidberg::Monitor;
our $VERSION = '0.1';
use strict;
use Zoidberg::PdParse;
use base 'Zoidberg::Fish';
sub init {
    my $self = shift;
    $self->{config}{applets} = pd_read($self->{config}{applet_file});
    foreach my $event (keys %{$self->{config}{applets}}) {
        foreach my $applet (keys %{$self->{config}{applets}{$event}}) {
                $self->{applets}{$event}{$applet} = {
                        'condition' => sub {eval($self->{config}{applets}{$event}{$applet}{condition})},
                        'action' => sub {eval($self->{config}{applets}{$event}{$applet}{action})},
                };
        }
        $self->register_event($event);
    }
}
sub event {
        my $self = shift;
        my $event = shift;
        #print "debug: got event $event\n";
        map { if ($_->{condition}->(@_)) { $_->{action}->($self, @_); } } values %{$self->{applets}{$event}};
}
sub list {
    my $self = shift;
    my $mode = defined wantarray?'message':'';
    $self->parent->print("The following applets are currently running: ",$mode);
    map {$self->parent->print("$_\n",$mode)} map {"event ".$_.":\n".join("\n", keys %{$self->{applets}{$_}}) } keys %{$self->{applets}};
    if (defined wantarray) {
        return [keys%{$self->{applets}}];
    }
}
sub add_applet {
        my $self = shift;
        my ($name, $event, $condition, $action) = @_;
        $self->{config}{applets}{$event}{$name} = { 'condition' => $condition, 'action' => $action };
        $self->{applets}{$event}{$name} = { 'condition' => sub {eval($condition)}, 'action' => sub {eval($action)} };
        unless (grep {/^$event$/} $self->registered_events) { $self->register_event($event); }
}
sub delete_applet {
    my $self = shift;
    my $name = shift;
    for (grep { grep {/^$_$/} keys %{$self->{applets}{$_}} } keys %{$self->{applets}}) {
        delete $self->{applets}{$_}{$name};
        delete $self->{config}{applets}{$_}{$name};
    }
}
sub round_up {
    my $self = shift;
    if ($self->parent->{shell}{round_up}) {
        pd_write($self->{config}{applet_file}, $self->{config}{applets}) || print "file write failed\n";
    }
}
1;
__END__
# Below is stub documentation for your module. You'd better edit it!
=head1 NAME
Zoidberg::Monitor - simple event monitoring
=head1 SYNOPSIS
This module is a Zoidberg plugin,
see Zoidberg::Fish for details.
=head1 ABSTRACT
  Simple event monitoring in the Zoidberg shell.
=head1 DESCRIPTION
This plugin allows you monitor events in a simple way.
You define a applet for a event by two blocks of code,
the first returning a boolean, the second doing some obscure
thingies. At the specified event if the first block returns
 1 the second block is executed.
  
This module is a nice example on how to use events in Zoidberg.
=head2 EXPORT
None by default.
=head1 METHODS
=head2 list()
  print applets in use
=head2 add_applet($name, $event_name, $condition, $action)
  start using an extra applet
  $name should be unique
  $condition and $action are both perl code as string
=head2 delete_applet($applet_name)
  never see applet $applet_name again
=head1 AUTHOR
R.L. Zwart, E<lt>carlos@caremail.nlE<gt>
Jaap Karssenberg || Pardus [Larus] E<lt>j.g.karssenberg@student.utwente.nlE<gt>
Copyright (c) 2002 Raoul L. Zwart. All rights reserved.
This program is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.
=head1 SEE ALSO
L<Zoidberg>
L<Zoidberg::Fish>
http://zoidberg.sourceforge.net.
=cut