# ex:ts=8 sw=4:
# $OpenBSD: Job.pm,v 1.2 2011/06/04 12:58:24 espie Exp $
#
# Copyright (c) 2010 Marc Espie <espie@openbsd.org>
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
use strict;
use warnings;

# a "job" is the actual stuff a core runs at some point.
# it's mostly an abstract class here... it's organized
# as a list of tasks, with a finalization routine
package DPB::Task;
sub end
{
}

sub code
{
	my $self = shift;
	return $self->{code};
}

sub new
{
	my ($class, $code) = @_;
	bless {code => $code}, $class;
}

sub run
{
	my ($self, $core) = @_;
	&{$self->code($core)}($core->{shell});
}

sub process
{
	my ($self, $core) = @_;
}

sub finalize
{
	my ($self, $core) = @_;
	return $core->{status} == 0;
}

sub redirect
{
	my ($self, $log) = @_;
	close STDOUT;
	close STDERR;
	open STDOUT, '>>', $log or die "Can't write to $log";
	open STDERR, '>&STDOUT' or die "bad redirect";
}

package DPB::Task::Pipe;
our @ISA =qw(DPB::Task);

sub fork
{
	my $self = shift;
	open($self->{fh}, "-|");
}

sub end
{
	my $self = shift;
	close($self->{fh});
}


package DPB::Task::Fork;
our @ISA =qw(DPB::Task);
sub fork
{
	CORE::fork();
}

package DPB::Job;
sub next_task
{
	my ($self, $core) = @_;
	return shift @{$self->{tasks}};
}

sub name
{
	my $self = shift;
	return $self->{name};
}

sub finalize
{
}

sub watched
{
	my $self = shift;
	return $self->{status};
}

sub add_tasks
{
	my ($self, @tasks) = @_;
	push(@{$self->{tasks}}, @tasks);
}

sub really_watch
{
}

sub new
{
	my ($class, $name) = @_;
	bless {name => $name, status => ""}, $class;
}

sub set_status
{
	my ($self, $status) = @_;
	$self->{status} = $status;
}

package DPB::Job::Normal;
our @ISA =qw(DPB::Job);

sub new
{
	my ($class, $code, $endcode, $name) = @_;
	my $o = $class->SUPER::new($name);
	$o->{tasks} = [DPB::Task::Fork->new($code)];
	$o->{endcode} = $endcode;
	return $o;
}

sub finalize
{
	my $self = shift;
	&{$self->{endcode}}(@_);
}

package DPB::Job::Infinite;
our @ISA = qw(DPB::Job);
sub next_task
{
	my $job = shift;
	return $job->{task};
}

sub new
{
	my ($class, $task, $name) = @_;
	my $o = $class->SUPER::new($name);
	$o->{task} = $task;
	return $o;
}

package DPB::Job::Pipe;
our @ISA = qw(DPB::Job);
sub new
{
	my ($class, $code, $name) = @_;
	my $o = $class->SUPER::new($name);
	$o->{tasks} = [DPB::Task::Pipe->new($code)];
	return $o;
}

1;