source: main/trunk/greenstone2/perllib/oaiinfo.pm@ 31192

Last change on this file since 31192 was 31192, checked in by ak19, 4 years ago

Replacing unnecessary functions and removing unused functions.

File size: 21.5 KB
Line 
1# This class based on arcinfo.pm
2package oaiinfo;
3
4use constant INFO_STATUS_INDEX => 0;
5use constant INFO_TIMESTAMP_INDEX => 1;
6
7use strict;
8
9use arcinfo;
10use dbutil;
11
12# QUESTIONS:
13# Should we use time or localtime(time) for timestamp? Just timestamp.
14# What format should the timestamp be in, or is the basic format used by perl sufficient? Basic.
15
16# File format read in: OID <tab> Date-timestamp <tab> Deletion-Status
17
18# Deletion status can be:
19# E = Doc with OID exists (has not been deleted from collection). Timestamp indicates last time of build
20# D = Doc with OID has been deleted. Timestamp indicates time of deletion
21# PD = Provisionally Deleted. Timestamp momentarily unaltered.
22
23# oaidb is "always incremental": always reflects the I/B/R/D status of archive info db,
24# before the indexing step of the build phase that alters the I/B/R/D contents of archive info db.
25# (I=index, B=been indexed, R=reindex; D=delete)
26
27sub new {
28 my $class = shift(@_);
29 my ($config_filename, $infodbtype) = @_;
30
31 my $self = {
32 'info'=>{} # map of {OID, array[deletion-status,timestamp]} pairs
33 };
34
35 if(!defined $infodbtype) {
36 $infodbtype = &dbutil::get_default_infodb_type();
37 }
38 $infodbtype = "gdbm" if ($infodbtype eq "gdbm-txtgz");
39 $self->{'infodbtype'} = $infodbtype;
40
41 # Create and store the db filenames we'll be working with (tmp and livedb)
42 my $etc_dir = &util::get_parent_folder($config_filename);
43
44 my $perform_firsttime_init = 0;
45 $self->{'oaidb_live_filepath'} = &dbutil::get_infodb_file_path($infodbtype, "oai-inf", $etc_dir, $perform_firsttime_init);
46 $self->{'oaidb_tmp_filepath'} = &dbutil::get_infodb_file_path($infodbtype, "oai-inf-tmp", $etc_dir, $perform_firsttime_init);
47 $self->{'etc_dir'} = $etc_dir;
48# print STDERR "############ LIVE DB: $self->{'oaidb_live_filepath'}\n";
49# print STDERR "############ TMP DB: $self->{'oaidb_tmp_filepath'}\n";
50
51 $self->{'oaidb_file_path'} = $self->{'oaidb_tmp_filepath'}; # db file we're working with
52
53 return bless $self, $class;
54}
55
56# this subroutine will work out the starting contents of the tmp-db (temporary oai db):
57# whether it should start off empty, or with the contents of any existing live-db,
58# or with the contents of any existing tmp-db.
59sub init_tmpdb {
60 my $self = shift(@_);
61 my ($removeold, $have_manifest) = @_;
62
63 # if we have a manifest file, then we pretend we are fully incremental for oaiinfo db.
64 # removeold implies proper full-rebuild, whereas keepold or incremental means incremental
65 if($have_manifest) { # if we have a manifest file, we're not doing removeold/full-rebuild either
66 $removeold = 0;
67 }
68
69 my $do_pd_step = ($removeold) ? 1 : 0;
70 # if $removeold, then proper full rebuild, will carry out step where all E will be marked as PD
71 # else some kind of incremental build, won't do the extra PD pass
72 # which is the step marking existing OIDs (E) as PD (provisionally deleted)
73
74 my $oaidb_live_filepath = $self->{'oaidb_live_filepath'};
75 my $oaidb_tmp_filepath = $self->{'oaidb_tmp_filepath'};
76 my $infodbtype = $self->{'infodbtype'};
77 # Note: the live db can only exist if the collection has been activated at least once before
78 my $livedb_exists = &FileUtils::fileExists($oaidb_live_filepath);
79 my $tmpdb_exists = &FileUtils::fileExists($oaidb_tmp_filepath);
80
81 my $initdb = 0;
82
83 # work out what operation we need to do
84 # work with empty tmpdb
85 # copy_livedb_to_tmpdb
86 # work with existing tmpdb (so existing tmpdb will be topped up)
87
88 # make_contents_of_tmpdb_empty
89 # make_contents_of_tmpdb_that_of_livedb
90 # continue_working_with_tmpdb ("contents_of_tmpdb_is_tmpdb")
91
92 # We're going to prepare the starting state of tmpdb next.
93 # It can start off empty, start off with the contents of livedb, or it can start off with the contents
94 # of the existing tmp db. Which of these three it is depends on the 3 factors: whether livedb exists,
95 # whether tmpdb exists and whether or not removeold is true.
96 # i.o.w. which of the 3 outcomes it is depends on the truth table built on the following 3 variables:
97 # LDB = LiveDB exists
98 # TDB = TmpDB exists
99 # RO = Removeold
100 # OUTCOMES:
101 # clean slate (create an empty tmpdb/make tmpdb empty)
102 # top up tmpDB (work with existing tmpdb)
103 # copy LiveDB to TmpDB (liveDB's contents become the contents of TmpDB, and we'll work with that)
104 #
105 # TRUTH TABLE:
106 # ---------------------------------------
107 # LDB TDB RO | Outcome
108 # ---------------------------------------
109 # 0 0 0 | clean-slate
110 # 0 0 1 | clean-slate
111 # 0 1 0 | top-up-tmpdb
112 # 0 1 1 | erase tmpdb, clean-slate
113 # 1 0 0 | copy livedb to tmpdb
114 # 1 0 1 | copy livedb to tmpdb
115 # 1 1 0 | top-up-tmpdb
116 # 1 1 1 | copy livedb to tmpd
117 # ---------------------------------------
118 #
119 # Dr Bainbridge worked out using Karnaugh maps that, from the above truth table:
120 # => clean-slate/empty-tmpdb = !LDB && (RO || !TDB)
121 # => top-up-tmpdb/work-with-existing-tmpdb = !RO && TDB
122 # => copy-livedb-to-tmpdb = LDB && (!TDB || RO)
123 # I had most of these tests, except that I hadn't (yet) merged the two clean slate instances
124 # of first-build-ever and make-contents-of-tmpdb-empty
125
126 #my $first_build_ever = (!$livedb_exists && !$tmpdb_exists);
127 #my $make_contents_of_tmpdb_empty = (!$livedb_exists && $tmpdb_exists && $removeold);
128 # Karnaugh map allows merging $first_build_ever and $make_contents_of_tmpdb_empty above
129 # into: my $work_with_empty_tmpdb = (!$livedb_exists && (!$tmpdb_exists || $removeold));
130 my $work_with_empty_tmpdb = (!$livedb_exists && (!$tmpdb_exists || $removeold));
131 my $make_contents_of_tmpdb_that_of_livedb = ($livedb_exists && (!$tmpdb_exists || $removeold));
132 my $work_with_existing_tmpdb = ($tmpdb_exists && !$removeold);
133
134 if($work_with_empty_tmpdb) { # we'll use an empty tmpdb
135
136 # If importing the collection for the very first time, neither db exists,
137 # so create an empty tmpdb.
138 #
139 # We also create an empty tmpdb when livedb doesn't exist and $removeold is true.
140 # This can happen if we've never run activate (so no livedb),
141 # yet had done some import (and perhaps building) followed by a full re-import now.
142 # Since there was no activate and we're doing a removeold/full-rebuild now, can just
143 # work with a new tmpdb, even though one already existed, its contents can be wiped out.
144 # In such a scenario, we'll be deleting tmpdb. Then there will be no livedb nor any tmpdb
145 # any more, so same situation as if importing the very first time when no oaidb exists either.
146
147 &dbutil::remove_db_file($self->{'infodbtype'}, $oaidb_tmp_filepath) if $tmpdb_exists; # remove the db file and any assoc files
148 $initdb = 1; # new tmpdb
149
150 # if the oai db is created the first time, it's like incremental and
151 # "keepold" (keepold means "only add, don't reprocess existing"). So
152 # no need to do the special passes dealing with "provisional deletes".
153 $do_pd_step = 0;
154
155 } elsif ($make_contents_of_tmpdb_that_of_livedb) {
156
157 # If the livedb exists and we're doing a full rebuild ($removeold is true),
158 # copy livedb to tmp regardless of if tmpdb already exists.
159 # Or if the livedb exists and tmpdb doesn't exist, it doesn't matter
160 # if we're incremental or not: also copy live to tmp and work with tmp.
161
162 # copy livedb to tmpdb
163 &dbutil::remove_db_file($self->{'infodbtype'}, $oaidb_tmp_filepath) if $tmpdb_exists; # remove the db file and any assoc files
164 &FileUtils::copyFiles($oaidb_live_filepath, $oaidb_tmp_filepath);
165
166 $initdb = 0; # tmpdb exists, since we just copied livedb to tmpdb, so need to init existing tmpdb
167
168 } else { # $work_with_existing_tmpdb, so we'll build on top of what's presently already in tmpdb
169 # (we'll be topping up the current tmpdb)
170
171 # !$removeold, meaning incremental
172 # If incremental and have a tmpdb already, regardless of whether livedb exists,
173 # then work with the existing tmpdb file, as this means we've been
174 # importing (perhaps followed by building) repeatedly without activating the
175 # last time but want to maintain the (incremental) changes in tmpdb.
176
177 $initdb = 0;
178
179 } # Dr Bainbridge drew up Karnaugh maps on the truth table, which proved that all cases
180 # are indeed covered above, so don't need any other catch-all else here
181
182 $self->{'oaidb_file_path'} = &dbutil::get_infodb_file_path($infodbtype, "oai-inf-tmp", $self->{'etc_dir'}, $initdb);
183 # final param follows jmt's $perform_firsttime_init in inexport.pm
184
185# print STDERR "@@@@@ oaidb: $self->{'oaidb_file_path'}\n";
186
187 return $do_pd_step;
188}
189
190sub get_filepath {
191 my $self = shift (@_);
192 return $self->{'oaidb_file_path'};
193}
194
195sub import_stage {
196 my $self = shift (@_);
197 my ($removeold, $have_manifest) = @_;
198
199 my $do_pd_step = $self->init_tmpdb($removeold, $have_manifest);
200 # returns 1 if the step to mark oaidb entries as PD is required
201 # if we're doing full rebuilding and it's NOT the first time creating the oai_inf db,
202 # then the tasks to do with PD (provisionally deleted) OAI OIDs should be carried out
203
204 $self->load_info();
205 $self->print_info(); # DEBUGGING
206
207 if ($do_pd_step) {
208 $self->mark_all_existing_as_provisionallydeleted();
209 $self->print_info(); # DEBUGGING
210
211 # save to db file now that we're done
212 $self->save_info();
213 }
214
215}
216
217sub building_stage_before_indexing() {
218 my $self = shift (@_);
219 my ($archivedir) = @_;
220
221 # load archive info db into memory
222 my $arcinfo_doc_filename = &dbutil::get_infodb_file_path($self->{'infodbtype'}, "archiveinf-doc", $archivedir);
223 my $arcinfo_src_filename = &dbutil::get_infodb_file_path($self->{'infodbtype'}, "archiveinf-src", $archivedir);
224 my $archive_info = new arcinfo ($self->{'infodbtype'});
225 $archive_info->load_info ($arcinfo_doc_filename);
226
227 #my $started_from_scratch = &FileUtils::fileTest($self->{'oaidb_tmp_filepath'}, '-z'); # 1 if tmpdb is empty
228 # -z test for file is empty http://www.perlmonks.org/?node_id=927447
229
230 # load the oaidb file's contents into memory.
231 $self->load_info();
232 $self->print_info(); # DEBUGGING
233
234 # process all the index, reindex and delete operations as indicated in arcinfo,
235 # all the while ensuring all PDs are changed back to E for OIDs that exist in both arcinfo and oaiinfo db.
236
237 foreach my $OID (keys $archive_info->{'info'}) {
238 my $arcinf_tuple = $archive_info->{'info'}->{$OID};
239 my $indexing_status = $arcinf_tuple->[arcinfo::INFO_STATUS_INDEX];
240 # use packageName::constant to refer to constants declared in another package,
241 # see http://perldoc.perl.org/constant.html
242
243 print STDERR "######## OID: $OID - status: $indexing_status\n";
244
245 if($indexing_status eq "I") {
246 $self->index($OID); # add new as E with current timestamp/or set existing as E with orig timestamp
247 } elsif($indexing_status eq "R") {
248 $self->reindex($OID); # update timestamp and ensure marked as E (if oid doesn't exist, add new)
249 } elsif($indexing_status eq "D") {
250 $self->delete($OID); # set as D with current timestamp
251 } elsif($indexing_status eq "B") { # B for "been indexed"
252 $self->been_indexed($OID); # will flip any PD to E if oid exists, else will add new entry for oid
253 # A new entry may be required if the collection had been built prior to turning this into
254 # an oaicollection. But what if we always maintain an oaidb? Still call $self->index() here.
255 } else {
256 print STDERR "### oaiinfo::building_stage_before_indexing(): Unrecognised indexing status $indexing_status\n";
257 }
258 }
259
260 # once all docs processed, go through oaiiinfo db changing any PDs to D along with current timestamp
261 # to indicate that they're deleted
262 $self->mark_all_provisionallydeleted_as_deleted();
263 $self->print_info();
264
265 # let's save to db file now that we're done
266 $self->save_info();
267
268}
269
270sub activate_collection { # move tmp db to live db
271 my $self = shift (@_);
272
273 my $oaidb_live_filepath = $self->{'oaidb_live_filepath'};
274 my $oaidb_tmp_filepath = $self->{'oaidb_tmp_filepath'};
275
276 my $livedb_exists = &FileUtils::fileExists($oaidb_live_filepath);
277 my $tmpdb_exists = &FileUtils::fileExists($oaidb_tmp_filepath);
278
279 if($tmpdb_exists) {
280 if($livedb_exists) {
281 #&dbutil::remove_db_file($self->{'infodbtype'}, s$oaidb_live_filepath); # remove the db file and any assoc files
282 &dbutil::rename_db_file_to($self->{'infodbtype'}, $oaidb_live_filepath, $oaidb_live_filepath.".bak"); # rename the db file and any assoc files
283 }
284 #&FileUtils::moveFiles($oaidb_tmp_filepath, $oaidb_live_filepath);
285 &dbutil::rename_db_file_to($self->{'infodbtype'}, $oaidb_tmp_filepath, $oaidb_live_filepath); # rename the db file and any assoc files
286
287 print STDERR "#### Should now have MOVED $self->{'oaidb_tmp_filepath'} to $self->{'oaidb_live_filepath'}\n";
288
289 } else {
290 print STDERR "@@@@@ In oaiinfo::activate_collection():\n";
291 print STDERR "@@@@@ No tmpdb at $self->{'oaidb_tmp_filepath'}\n";
292 print STDERR "@@@@@ to make 'live' by moving to $self->{'oaidb_live_filepath'}.\n";
293 }
294}
295
296##################### SPECIFIC TO PD-STEP ####################
297
298
299# mark all existing, E (non-deleted) OIDs as Provisionally Deleted (PD)
300# this subroutine doesn't save to oai-inf.DB
301# the caller should call save_info when they want to save to the db
302sub mark_all_existing_as_provisionallydeleted {
303 my $self = shift (@_);
304
305 print STDERR "@@@@@ oaiinfo::mark_all_E_as_PD(): Marking the E entries as PD\n";
306
307 foreach my $OID (keys $self->{'info'}) {
308 my $OID_info = $self->{'info'}->{$OID};
309 my $curr_status = $OID_info->[INFO_STATUS_INDEX];
310 if($curr_status eq "E") {
311 $OID_info->[INFO_STATUS_INDEX] = "PD";
312 }
313 }
314}
315
316# mark all OIDs that are Provisionally Deleted (PD) as deleted, and set to current timestamp
317# To be called at end of build. Again, the caller should save to DB by calling save_info.
318sub mark_all_provisionallydeleted_as_deleted {
319 my $self = shift (@_);
320
321 print STDERR "@@@@@ oaiinfo::mark_all_PD_as_D(): Marking the PD entries as D\n";
322
323 foreach my $OID (keys $self->{'info'}) {
324 my $OID_info = $self->{'info'}->{$OID};
325 my $curr_status = $OID_info->[INFO_STATUS_INDEX];
326 if($curr_status eq "PD") {
327 $self->set_info($OID, "D", $self->get_current_time());
328 }
329 }
330}
331
332
333##################### GENERAL, NOT SPECIFIC TO PD-STEP ####################
334
335sub print_info {
336 my $self = shift (@_);
337
338 print STDERR "###########################################################\n";
339 print STDERR "@@@@@ oaiinfo::print_info(): oaidb in memory contains: \n";
340
341 foreach my $OID (keys $self->{'info'}) {
342 print STDERR "OID: $OID";
343 print STDERR " status: " . $self->{'info'}->{$OID}->[INFO_STATUS_INDEX];
344 print STDERR " time: " . $self->{'info'}->{$OID}->[INFO_TIMESTAMP_INDEX];
345 print STDERR "\n";
346 }
347
348 print STDERR "###########################################################\n";
349}
350
351
352# Find the OID, if it exists, make its status=E for existing. Leave its timestamp alone.
353# If the OID doesn't yet exist, add it as a new entry with status=E and with current timestamp.
354sub index { # Add a new oid with current time and E. If the oid was already present, mark as E
355 my $self = shift (@_);
356 my ($OID) = @_;
357
358 my $OID_info = $self->{'info'}->{$OID};
359
360 if (defined $OID_info) { # if OID is present, this will change status back to E, timestamp unchanged
361 $OID_info->[INFO_STATUS_INDEX] = "E";
362
363 } else { # if OID is not present, then it's now added as existing from current time on
364 $self->set_info($OID, "E", $self->get_current_time());
365 }
366}
367
368# Upon reindexing a document with identifier OID, change its timestamp to current time
369# if a new OID, then add as new entry with status=E and current timestamp
370sub reindex { # update timestamp if oid is already present, if not (unlikely), add as new
371 my $self = shift (@_);
372 my ($OID) = @_;
373
374 my $OID_info = $self->{'info'}->{$OID};
375 $self->set_info($OID, "E", $self->get_current_time()); # Takes care of 3 things:
376 # if OID exists, updates modified time to indicate the doc has been reindexed
377 # if OID exists, ensures any status=PD is flipped back to E for this OID doc (as we know it exists);
378 # if the OID doesn't yet exist, adds a new OID entry with status=E and current timestamp.
379
380}
381
382# Does the same as index():
383# OIDs that have been indexed upon rebuild may still be new to the oaidb: GS2 collections
384# are not OAI collections by default, unlike GS3 collections. Imagine rebuilding a (GS2) collection
385# 5 times and then setting them to be an OAI collection. In that case, the doc OIDs in the collection
386# may not be in the oaidb yet. Unless, we decide (as is the present case) to always maintain an oaidb
387# (always creating an oaidb regardless of whether the collection has OAI support turned on or not).
388sub been_indexed {
389 my $self = shift (@_);
390 my ($OID) = @_;
391
392 $self->index($OID);
393}
394
395# Upon deleting a document with identifier OID,
396# set status to deleted and change its timestamp to current time
397sub delete {
398 my $self = shift (@_);
399 my ($OID) = @_;
400
401 # the following method will set to current time if no timestamp provided,
402 # But by explicit here, the code is easier to follow
403 $self->set_info($OID, "D", $self->get_current_time());
404
405}
406
407#############################################################
408sub get_current_time {
409 my $self = shift (@_);
410 return time; # current time
411
412 # localtime(time) returns an array of values (day, month, year, hour, min, seconds) or singular string
413 # return localtime; # same as localtime(time); # http://perldoc.perl.org/functions/localtime.html
414
415}
416
417sub _load_info_txt
418{
419 my $self = shift (@_);
420 my ($filename) = @_;
421
422 if (defined $filename && &FileUtils::fileExists($filename)) {
423 open (INFILE, $filename) ||
424 die "oaiinfo::load_info couldn't read $filename\n";
425
426 my ($line, @lineparts);
427 while (defined ($line = <INFILE>)) {
428 $line =~ s/\cM|\cJ//g; # remove end-of-line characters
429 @lineparts = split ("\t", $line);
430 if (scalar(@lineparts) >= 2) {
431 $self->set_info (@lineparts);
432 }
433 }
434 close (INFILE);
435 }
436
437}
438
439sub _load_info_db
440{
441 my $self = shift (@_);
442 my ($filename) = @_;
443
444 my $infodb_map = {};
445
446 &dbutil::read_infodb_file($self->{'infodbtype'}, $filename, $infodb_map);
447
448 foreach my $oid ( keys $infodb_map ) {
449 my $vals = $infodb_map->{$oid};
450 # interested in oid, timestamp, deletion status
451
452 my ($deletion_status) = ($vals=~/^<status>(.*)$/m);
453 my ($timestamp) = ($vals=~/^<timestamp>(.*)$/m);
454
455 $self->set_info ($oid, $deletion_status, $timestamp);
456 }
457}
458
459# if no filename is passed in (and you don't generally want to), then
460# it tries to load in <collection>/etc/oai-inf.<db> if it exists
461sub load_info {
462 my $self = shift (@_);
463 my ($filename) = @_;
464
465 $self->{'info'} = {};
466
467 $filename = $self->{'oaidb_file_path'} unless defined $filename;
468
469 if (&FileUtils::fileExists($filename)) {
470 if ($filename =~ m/\.inf$/) {
471 $self->_load_info_txt($filename);
472 }
473 else {
474 $self->_load_info_db($filename);
475 }
476 }
477
478}
479
480sub _save_info_txt {
481 my $self = shift (@_);
482 my ($filename) = @_;
483
484 my ($OID, $info);
485
486 open (OUTFILE, ">$filename") ||
487 die "oaiinfo::save_info couldn't write $filename\n";
488
489 foreach $info (@{$self->get_OID_list()}) {
490 if (defined $info) {
491 print OUTFILE join("\t", @$info), "\n";
492 }
493 }
494 close (OUTFILE);
495}
496
497# if no filename is passed in (and you don't generally want to), then
498# this subroutine tries to write to <collection>/etc/oai-inf.<db>.
499sub _save_info_db {
500 my $self = shift (@_);
501 my ($filename) = @_;
502
503 $filename = $self->{'oaidb_file_path'} unless defined $filename;
504 my $infodbtype = $self->{'infodbtype'};
505
506 # write out again. Open file for overwriting, not appending.
507 # Then write out data structure $self->{'info'} that's been maintaining the data in-memory.
508 my $infodb_handle = &dbutil::open_infodb_write_handle($infodbtype, $filename);
509 foreach my $oid ( keys $self->{'info'} ) {
510 my $OID_info = $self->{'info'}->{$oid};
511 #my $val_hash = {
512 # "status" => $OID_info->[INFO_STATUS_INDEX],
513 # "timestamp" => $OID_info->[INFO_TIMESTAMP_INDEX]
514 #};
515
516 #&dbutil::write_infodb_rawentry($infodbtype,$infodb_handle,$oid,$val_hash);
517
518 my $val = "<status>".$OID_info->[INFO_STATUS_INDEX]."\n<timestamp>".$OID_info->[INFO_TIMESTAMP_INDEX]."\n";
519 &dbutil::write_infodb_rawentry($infodbtype,$infodb_handle,$oid,$val);
520 }
521 &dbutil::close_infodb_write_handle($infodbtype, $infodb_handle);
522}
523
524sub save_info {
525 my $self = shift (@_);
526 my ($filename) = @_;
527
528 if(defined $filename) {
529 if ($filename =~ m/(contents)|(\.inf)$/) {
530 $self->_save_info_txt($filename);
531 }
532 else {
533 $self->_save_info_db($filename);
534 }
535 } else {
536 $self->_save_info_db();
537 }
538}
539
540
541sub set_info { # sets existing or appends
542 my $self = shift (@_);
543 my ($OID, $del_status, $timestamp) = @_;
544 if(!defined $timestamp) { # get current date timestamp
545 $timestamp = $self->get_current_time();
546 }
547 $self->{'info'}->{$OID} = [$del_status, $timestamp];
548
549}
550
551
552# returns a list of the form [[OID, timestamp, deletion_status], ...]
553sub get_OID_list
554{
555 my $self = shift (@_);
556
557 my @list = ();
558
559 foreach my $OID (keys $self->{'info'}) {
560 my $OID_info = $self->{'info'}->{$OID};
561
562 push (@list, [$OID, $OID_info->[INFO_STATUS_INDEX],
563 $OID_info->[INFO_TIMESTAMP_INDEX]]);
564 }
565
566 return \@list;
567}
568
569
570# returns the number of entries so far, including deleted ones
571# http://stackoverflow.com/questions/1109095/how-can-i-find-the-number-of-keys-in-a-hash-in-perl
572sub size {
573 my $self = shift (@_);
574 return (scalar keys $self->{'info'});
575}
576
5771;
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