/usr/share/perl5/DBIx/Recordset/FileSeq.pm is in libdbix-recordset-perl 0.26-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# DBIx::Recordset - Copyright (c) 1997-2000 Gerald Richter / ECOS
#
# You may distribute under the terms of either the GNU General Public
# License or the Artistic License, as specified in the Perl README file.
#
# THIS IS BETA SOFTWARE!
#
# THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
# WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
#
# $Id: FileSeq.pm,v 1.4 2000/06/26 05:16:18 richter Exp $
#
###################################################################################
package DBIx::Recordset::FileSeq ;
use strict 'vars' ;
use Cwd ;
## ----------------------------------------------------------------------------
##
## new
##
## creates a new DBIx::Recordset::FileSeq object.
##
## $dir = Directory which holds the sequences
##
sub new
{
my ($class, $dummy, $dir, $min, $max) = @_ ;
mkdir $dir, 0755 or die "Cannot create $dir ($!)" if (!-e $dir) ;
die "$dir is not a directory" if (!-d $dir) ;
my $self = {
'*Debug' => $DBIx::Recordset::Debug,
'*Dir' => Cwd::abs_path ($dir),
'*DefaultMin' => $min || 1,
'*DefaultMax' => $max || '',
} ;
bless ($self, $class) ;
$self -> ReadCounter ;
return $self ;
}
## ----------------------------------------------------------------------------
##
## ReadCounter
##
## read current counters form filesystem
##
##
sub ReadCounter
{
my $self = shift ;
my %counter ;
my %max ;
opendir DH, $self -> {'*Dir'} or die "Cannot open directory $self->{'*Dir'} ($!)" ;
while ($_ = readdir DH)
{
if (/seq\.(.*?)\.(\d*?)\.(\d+)$/)
{
$counter{$1}=$3 ;
$max{$1}=$2 ;
}
}
$self -> {'*Counter'} = \%counter ;
$self -> {'*Max'} = \%max ;
}
## ----------------------------------------------------------------------------
##
## NextVal
##
## get next value from counter
##
## in $name = counter name
##
sub NextVal
{
my ($self, $name) = @_ ;
my $dir = $self -> {'*Dir'} ;
my $lastcnt ;
local $^W = 0 ;
while (1)
{
my $cnt = $self -> {'*Counter'}{$name} ;
my $max = $self -> {'*Max'}{$name} ;
if (!defined ($cnt))
{
$cnt = $self->{'*DefaultMin'} ;
$max = $self->{'*DefaultMax'} ;
open FH, ">$dir/seq.$name.$max.$cnt" or die "Cannot create seq.$name..1 ($!)" ;
close FH ;
}
my $cnt1 = $cnt + 1 ;
die "Max count reached for Sequence $name" if ($max ne '' && $cnt1 > $max) ;
if (rename ("$dir/seq.$name.$max.$cnt", "$dir/seq.$name.$max.$cnt1"))
{
$self -> {'*Counter'}{$name} = $cnt1 ;
return $cnt ;
}
my $lastcnt = $cnt ;
$self -> ReadCounter ;
die "Problems updating Sequence $name (File $dir/seq.$name.$max.$cnt)" if ($lastcnt == $self -> {'*Counter'}{$name} ) ;
}
}
1;
__END__
=pod
=head1 NAME
DBIx::Recordset::FileSeq - Sequence generator in Filesystem
=head1 SYNOPSIS
use DBIx::Recordset::FileSeq ;
$self = DBIx::Recordset::FileSeq (undef, '/tmp/seq', $min, $max) ;
$val1 = $self -> NextVal ('foo') ;
$val2 = $self -> NextVal ('foo') ;
$val3 = $self -> NextVal ('bar') ;
=head1 DESCRIPTION
DBIx::Recordset::FileSeq generates unique numbers. State is kept in the
filesystem. With the new constructor you specify the directory
where the state is kept. (First parameter is a dummy values, that will
receive the database handle from DBIx::Recordset, but you don't need it
when you use it without DBIx::Recordset). Optionaly you can give a min and
a max values, which will be used for new sequences.
With B<NextVal> you can get the next value
for the sequence of the given name.
The state if kept by haveing a file with the name
seq.<seqencename>.<max>.<count>
Each time the sequnce value increments the file is renamed. If the <max>
if a numeric value the new value is checked against <max> and NextVal
dies if the sequnce value increment above max.
=head1 AUTHOR
G.Richter (richter@dev.ecos.de)
=head1 SEE ALSO
=over
=item DBIx::Recordset
=back
=cut
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