1 package Onis::Data::Persistent::Dbm;
8 @AnyDBM_File::ISA = (qw(GDBM_File 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.
37 our $DBMDirectory = get_config ('dbm_directory') || 'var';
38 $DBMDirectory =~ s#/$##g;
40 if (!$DBMDirectory or !-d $DBMDirectory)
43 The directory ``$DBMDirectory'' does not exist or is not useable. Please
44 create it before running onis.
52 if ($::DEBUG & 0x0200)
65 my $caller = caller ();
71 my $id = $caller . ':' . $name;
74 $filename = "$DBMDirectory/$id.dbm";
76 if (exists ($Objects{$id}))
78 print STDERR $/, __FILE__, ": Name $name has been used in context $caller before.";
83 tie (%hash, 'AnyDBM_File', $filename, O_RDWR | O_CREAT, 0666) or die ("tie: $!");
85 $obj->{'data'} = tied %hash;
87 $obj->{'fields'} = [@fields];
88 $obj->{'num_fields'} = scalar (@fields);
89 $obj->{'field_index'} = {map { $_ => $i++ } (@fields)};
93 if ($::DEBUG & 0x0200)
95 my $prefix = __FILE__ . ': ';
96 my $dbg = Data::Dumper->Dump ([$obj], ['obj']);
97 $dbg =~ s/^/$prefix/mg; chomp ($dbg);
98 print STDOUT $/, $dbg;
101 $Objects{$id} = bless ($obj, $pkg);
102 return ($Objects{$id});
110 my $db = $obj->{'data'};
112 if ($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 = $obj->{'data'};
174 no strict (qw(subs));
175 for ($db->seq ($key, $val, R_FIRST); $db->seq ($key, $val, R_NEXT) == 0;)
177 next if (defined ($obj->{'cache'}{$key}));
178 $obj->{'cache'}{$key} = [split ($Alarm, $val)];
183 return (keys %{$obj->{'cache'}});
189 if (!defined ($obj->{'field_index'}{$field}))
191 my $id = $obj->{'id'};
192 print STDERR $/, __FILE__, ": $field is not a valid field ($id).";
195 push (@field_indizes, $obj->{'field_index'}{$field});
202 my $d = $obj->{'cache'}{$a}[$_] cmp $obj->{'cache'}{$b}[$_];
205 } (keys %{$obj->{'cache'}}));
212 my $db = $obj->{'data'};
214 if (exists ($obj->{'cache'}{$key}))
216 if (defined ($obj->{'cache'}{$key}))
219 $obj->{'cache'}{$key} = undef;
221 # It's known that the key doesn't exist..
226 $obj->{'cache'}{$key} = undef;
233 my $db = $obj->{'data'};
235 for (CORE::keys %{$obj->{'cache'}})
238 next unless (defined ($obj->{'cache'}{$key}));
240 my $val = join ($Alarm, @{$obj->{'cache'}{$key}});
242 $db->put ($key, $val);
243 delete ($obj->{'cache'}{$key});
251 for (CORE::keys (%Objects))
254 my $obj = $Objects{$key};
261 Florian octo Forster, L<octo at verplant.org>