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################################################################################### |
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# |
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# DBIx::Recordset - Copyright (c) 1997-2000 Gerald Richter / ECOS |
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# |
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# You may distribute under the terms of either the GNU General Public |
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# License or the Artistic License, as specified in the Perl README file. |
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# |
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# THIS IS BETA SOFTWARE! |
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# |
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# THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR |
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# IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
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# WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
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# $Id: FileSeq.pm,v 1.4 2000/06/26 05:16:18 richter Exp $ |
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# |
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################################################################################### |
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package DBIx::Recordset::FileSeq ; |
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use strict 'vars' ; |
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use Cwd ; |
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## ---------------------------------------------------------------------------- |
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## |
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## new |
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## |
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## creates a new DBIx::Recordset::FileSeq object. |
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## |
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## $dir = Directory which holds the sequences |
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## |
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sub new |
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{ |
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my ($class, $dummy, $dir, $min, $max) = @_ ; |
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mkdir $dir, 0755 or die "Cannot create $dir ($!)" if (!-e $dir) ; |
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die "$dir is not a directory" if (!-d $dir) ; |
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my $self = { |
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'*Debug' => $DBIx::Recordset::Debug, |
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'*Dir' => Cwd::abs_path ($dir), |
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'*DefaultMin' => $min || 1, |
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'*DefaultMax' => $max || '', |
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} ; |
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bless ($self, $class) ; |
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$self -> ReadCounter ; |
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return $self ; |
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} |
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## ---------------------------------------------------------------------------- |
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## |
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## ReadCounter |
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## |
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## read current counters form filesystem |
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## |
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## |
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sub ReadCounter |
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{ |
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my $self = shift ; |
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my %counter ; |
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my %max ; |
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opendir DH, $self -> {'*Dir'} or die "Cannot open directory $self->{'*Dir'} ($!)" ; |
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while ($_ = readdir DH) |
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{ |
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if (/seq\.(.*?)\.(\d*?)\.(\d+)$/) |
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{ |
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$counter{$1}=$3 ; |
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$max{$1}=$2 ; |
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} |
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} |
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$self -> {'*Counter'} = \%counter ; |
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$self -> {'*Max'} = \%max ; |
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} |
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## ---------------------------------------------------------------------------- |
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## |
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## NextVal |
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## |
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## get next value from counter |
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## |
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## in $name = counter name |
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## |
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sub NextVal |
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{ |
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my ($self, $name) = @_ ; |
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my $dir = $self -> {'*Dir'} ; |
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my $lastcnt ; |
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local $^W = 0 ; |
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while (1) |
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{ |
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my $cnt = $self -> {'*Counter'}{$name} ; |
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my $max = $self -> {'*Max'}{$name} ; |
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if (!defined ($cnt)) |
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{ |
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$cnt = $self->{'*DefaultMin'} ; |
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$max = $self->{'*DefaultMax'} ; |
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open FH, ">$dir/seq.$name.$max.$cnt" or die "Cannot create seq.$name..1 ($!)" ; |
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close FH ; |
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} |
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0
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my $cnt1 = $cnt + 1 ; |
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die "Max count reached for Sequence $name" if ($max ne '' && $cnt1 > $max) ; |
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if (rename ("$dir/seq.$name.$max.$cnt", "$dir/seq.$name.$max.$cnt1")) |
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{ |
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$self -> {'*Counter'}{$name} = $cnt1 ; |
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return $cnt ; |
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} |
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0
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my $lastcnt = $cnt ; |
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$self -> ReadCounter ; |
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die "Problems updating Sequence $name (File $dir/seq.$name.$max.$cnt)" if ($lastcnt == $self -> {'*Counter'}{$name} ) ; |
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} |
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} |
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1; |
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__END__ |