1 package Onis::Data::Persistent::Dbm;
8 @AnyDBM_File::ISA = (qw(DB_File GDBM_File SDBM_File NDBM_File ODBM_File));
11 use Carp qw(carp confess);
12 use Fcntl (qw(O_RDWR O_CREAT));
15 use Onis::Config (qw(get_config));
19 Onis::Data::Persistent::Dbm - Storage backend using AnyDBM_File.
23 Storage backend that uses DBM files for storing data permanently.
25 =head1 CONFIGURATION OPTIONS
29 =item B<dbm_directory>: I<E<lt>dirE<gt>>
31 Directory in which the DBM-files are kept. Defaults to the B<var>-directory in
32 onis' main directory..
38 our $DBMDirectory = get_config ('storage_dir') || 'var';
39 $DBMDirectory =~ s#/$##g;
41 if (!$DBMDirectory or !-d $DBMDirectory)
44 The directory ``$DBMDirectory'' does not exist or is not useable. Please
45 create it before running onis.
53 if ($::DEBUG & 0x0200)
66 my $caller = caller ();
72 my $id = $caller . ':' . $name;
75 $filename = "$DBMDirectory/$id.dbm";
77 if (exists ($Objects{$id}))
79 print STDERR $/, __FILE__, ": Name $name has been used in context $caller before.";
84 tie (%hash, 'AnyDBM_File', $filename, O_RDWR | O_CREAT, 0666) or die ("tie: $!");
86 $obj->{'data'} = tied %hash;
88 $obj->{'fields'} = [@fields];
89 $obj->{'num_fields'} = scalar (@fields);
90 $obj->{'field_index'} = {map { $_ => $i++ } (@fields)};
94 if ($::DEBUG & 0x0200)
96 my $prefix = __FILE__ . ': ';
97 my $dbg = Data::Dumper->Dump ([$obj], ['obj']);
98 $dbg =~ s/^/$prefix/mg; chomp ($dbg);
99 print STDOUT $/, $dbg;
102 $Objects{$id} = bless ($obj, $pkg);
103 return ($Objects{$id});
112 if ($obj->{'num_fields'} != scalar (@fields))
114 my $id = $obj->{'id'};
115 carp ("Number of fields do not match ($id).");
119 if ($::DEBUG & 0x0200)
121 print STDOUT $/, __FILE__, ': PUT(', $obj->{'id'}, ', ', $key, ') = (' . join (', ', @fields) . ')';
124 $obj->{'cache'}{$key} = [@fields];
133 my $db = $obj->{'data'};
135 if (!exists ($obj->{'cache'}{$key}))
137 $val = $db->FETCH ($key);
140 $obj->{'cache'}{$key} = undef;
144 $obj->{'cache'}{$key} = [split ($Alarm, $val)];
148 if (!defined ($obj->{'cache'}{$key}))
154 @ret = @{$obj->{'cache'}{$key}};
157 if ($::DEBUG & 0x0200)
159 print STDOUT $/, __FILE__, ': GET(', $obj->{'id'}, ', ', $key, ') = (' . join (', ', @ret) . ')';
169 my @field_indizes = ();
170 my $db = $obj->{'data'};
174 no strict (qw(subs));
175 for (($key, $val) = $db->FIRSTKEY (); defined ($key) and defined ($val); ($key, $val) = $db->NEXTKEY ($key))
177 next if (defined ($obj->{'cache'}{$key}));
179 $obj->{'cache'}{$key} = [split ($Alarm, $val)];
184 return (keys %{$obj->{'cache'}});
190 if (!defined ($obj->{'field_index'}{$field}))
192 my $id = $obj->{'id'};
193 print STDERR $/, __FILE__, ": $field is not a valid field ($id).";
196 push (@field_indizes, $obj->{'field_index'}{$field});
203 my $d = $obj->{'cache'}{$a}[$_] cmp $obj->{'cache'}{$b}[$_];
206 } (keys %{$obj->{'cache'}}));
213 my $db = $obj->{'data'};
215 if (exists ($obj->{'cache'}{$key}))
217 if (defined ($obj->{'cache'}{$key}))
220 $obj->{'cache'}{$key} = undef;
222 # It's known that the key doesn't exist..
227 $obj->{'cache'}{$key} = undef;
234 my $db = $obj->{'data'};
236 for (CORE::keys %{$obj->{'cache'}})
239 next unless (defined ($obj->{'cache'}{$key}));
241 my $val = join ($Alarm, @{$obj->{'cache'}{$key}});
243 $db->STORE ($key, $val);
244 delete ($obj->{'cache'}{$key});
252 for (CORE::keys (%Objects))
255 my $obj = $Objects{$key};
262 Florian octo Forster, L<octo at verplant.org>