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package Echolot::Scheduler;
# (c) 2002 Peter Palfrader <peter@palfrader.org>
# $Id: Scheduler.pm,v 1.16 2003/06/06 11:50:30 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 English;
use Echolot::Log;
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<missok>, 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.
I<missok> indicates that it is ok to miss one run of this job. This can happen
if we run behind schedule for instance.
=cut
sub add($$$$$$) {
my ($self, $name, $interval, $offset, $missok, $what) = @_;
Echolot::Log::logdie("Must not add zero intervall for job $name.")
unless $interval;
if (defined $self->{'tasks'}->{$name}) {
@{ $self->{'schedule'} } = grep { $_->{'name'} ne $name } @{ $self->{'schedule'} };
};
$self->{'tasks'}->{$name} =
{
interval => $interval,
offset => $offset,
what => $what,
order => $ORDER++,
missok => $missok,
};
$self->schedule($name, 1);
return 1;
};
=item B<schedule> (I<name>, I<reschedule>, [ I<for>, [I<arguments>]] )
Schedule execution of I<name> for I<for>. If I<for> is not given it is calculated
from I<interval> and I<offset> passed to B<new>. if I<reschedule> is set
the task will be rescheduled when it's done (according to its interval).
You may also give arguments to passed to the task.
=cut
sub schedule($$$;$$) {
my ($self, $name, $reschedule, $for, $arguments) = @_;
(defined $self->{'tasks'}->{$name}) or
Echolot::Log::warn("Task $name is not defined."),
return 0;
my $interval = $self->{'tasks'}->{$name}->{'interval'};
my $offset = $self->{'tasks'}->{$name}->{'offset'};
unless (defined $for) {
($interval < 0) and
return 1;
my $now = time();
$for = $now - $now % $interval + $offset;
($for <= $now) and $for += $interval;
my $cnt = 0;
while ($self->{'tasks'}->{$name}->{'missok'} && ($for <= $now)) {
$for += $interval;
$cnt ++;
};
Echolot::Log::debug("Skipping $cnt runs of $name.") if $cnt;
};
$arguments = [] unless defined $arguments;
push @{ $self->{'schedule'} },
{
start => $for,
order => $self->{'tasks'}->{$name}->{'order'},
name => $name,
arguments => $arguments,
reschedule => $reschedule
};
@{ $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) = @_;
(defined $self->{'schedule'}->[0]) or
Echolot::Log::warn("Scheduler is empty."),
return 0;
while(1) {
my $now = time();
my $task = $self->{'schedule'}->[0];
if ($task->{'start'} < $now) {
Echolot::Log::warn("Task $task->{'name'} could not be started on time.")
unless ($task->{'start'} == 0);
} else {
Echolot::Log::debug("zZzZZzz.");
$PROGRAM_NAME = "pingd [sleeping]";
sleep ($task->{'start'} - $now);
};
(time() < $task->{'start'}) and
next;
$now = $task->{'start'};
do {
$task = shift @{ $self->{'schedule'} };
my $name = $task->{'name'};
$PROGRAM_NAME = "pingd [executing $name]";
(defined $self->{'tasks'}->{$name}) or
Echolot::Log::cluck("Task $task->{'name'} is not defined.");
my $what = $self->{'tasks'}->{$name}->{'what'};
Echolot::Log::debug("Running $name (was scheduled for ".(time()-$now)." seconds ago).");
last if ($what eq 'exit');
&$what( $now, @{ $task->{'arguments'} } );
$self->schedule($name, 1, $now + $self->{'tasks'}->{$name}->{'interval'}) if
($task->{'reschedule'} && $self->{'tasks'}->{$name}->{'interval'} > 0);
(defined $self->{'schedule'}->[0]) or
Echolot::Log::warn("Scheduler is empty."),
return 0;
} while ($now >= $self->{'schedule'}->[0]->{'start'});
};
return 1;
};
# vim: set ts=4 shiftwidth=4:
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