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package Echolot::Scheduler;
# (c) 2002 Peter Palfrader <peter@palfrader.org>
# $Id: Scheduler.pm,v 1.2 2002/06/11 10:16:38 weasel Exp $
#
=pod
=head1 Name
Echolot::Scheduler - Task selector/scheduler for echolot
=head1 DESCRIPTION
This package provides several functions for scheduling tasks within
the ping daemon.
=over
=cut
use strict;
use warnings;
use Carp qw{cluck};
my $ORDER = 1;
=item B<new> ()
Creates a new scheduler object.
=cut
sub new {
my ($class, %params) = @_;
my $self = {};
bless $self, $class;
return $self;
};
=item B<add> (I<name>, I<interval>, I<offset>, I<what>)
Adds a task with I<name> to the list of tasks. Every I<interval> seconds
I<what> is called. If for example I<interval> is 3600 - meaning I<what>
should be executed hourly - setting I<offset> to 600 would mean that
it get's called 10 minutes after the hour.
=cut
sub add($$$$$) {
my ($self, $name, $interval, $offset, $what) = @_;
if (defined $self->{'tasks'}->{$name}) {
@{ $self->{'schedule'} } = grep { $_->{'name'} ne $name } @{ $self->{'schedule'} };
};
$self->{'tasks'}->{$name} =
{
interval => $interval,
offset => $offset,
what => $what,
order => $ORDER++
};
$self->schedule($name);
return 1;
};
=item B<schedule> (I<name>, I<for>)
Internal function.
Schedule execution of I<name> for I<for>. If I<for> is not given it is calculated
from I<interval> and I<offset> passed to B<new>.
=cut
sub schedule($$;$) {
my ($self, $name, $for) = @_;
(defined $self->{'tasks'}->{$name}) or
cluck("Task $name is not defined"),
return 0;
my $interval = $self->{'tasks'}->{$name}->{'interval'};
my $offset = $self->{'tasks'}->{$name}->{'offset'};
unless (defined $for) {
my $now = time();
$for = $now - $now % $interval + $offset;
($for <= $now) and $for += $interval;
};
push @{ $self->{'schedule'} },
{
start => $for,
order => $self->{'tasks'}->{$name}->{'order'},
name => $name
};
@{ $self->{'schedule'} } = sort { $a->{'start'} <=> $b->{'start'} or $a->{'order'} <=> $b->{'order'} }
@{ $self->{'schedule'} };
return 1;
};
=item B<run> ()
Start the scheduling run.
It will run forever or until a task with I<what> == 'exit' is executed.
=cut
sub run($) {
my ($self) = @_;
my $task = shift @{ $self->{'schedule'} };
(defined $task) or
croak("Scheduler is empty"),
return 0;
while(1) {
my $now = time();
if ($task->{'start'} < $now) {
warn("Task $task->{'name'} could not be started on time\n");
} else {
sleep ($task->{'start'} - $now);
};
$now = $task->{'start'};
do {
my $name = $task->{'name'};
(defined $self->{'tasks'}->{$name}) or
warn("Task $task->{'name'} is not defined\n");
my $what = $self->{'tasks'}->{$name}->{'what'};
last if ($what eq 'exit');
&$what();
$self->schedule($name, $now + $self->{'tasks'}->{$name}->{'interval'});
$task = shift @{ $self->{'schedule'} };
(defined $task) or
croak("Scheduler is empty"),
return 0;
} while ($now == $task->{'start'});
};
return 1;
};
# vim: set ts=4 shiftwidth=4:
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