File:
[LON-CAPA] /
loncom /
interface /
loncoursedata.pm
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1.6:
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Thu Jul 25 21:23:51 2002 UTC (21 years, 11 months ago) by
stredwic
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Updating lonstudentassessment to add in features of lonchart. Now the
data display is like lonchart with formatted columns of data. The next
step will be to add in the column removal check boxes and a multiselect
box for sections.
1: # The LearningOnline Network with CAPA
2: # (Publication Handler
3: #
4: # $Id: loncoursedata.pm,v 1.6 2002/07/25 21:23:51 stredwic Exp $
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
28: ###
29:
30: =pod
31:
32: =head1 NAME
33:
34: loncoursedata
35:
36: =head1 SYNOPSIS
37:
38: Set of functions that download and process student information.
39:
40: =head1 PACKAGES USED
41:
42: Apache::Constants qw(:common :http)
43: Apache::lonnet()
44: HTML::TokeParser
45: GDBM_File
46:
47: =cut
48:
49: package Apache::loncoursedata;
50:
51: use strict;
52: use Apache::Constants qw(:common :http);
53: use Apache::lonnet();
54: use HTML::TokeParser;
55: use GDBM_File;
56:
57: =pod
58:
59: =head1 DOWNLOAD INFORMATION
60:
61: This section contains all the files that get data from other servers
62: and/or itself. There is one function that has a call to get remote
63: information but isn't included here which is ProcessTopLevelMap. The
64: usage was small enough to be ignored, but that portion may be moved
65: here in the future.
66:
67: =cut
68:
69: # ----- DOWNLOAD INFORMATION -------------------------------------------
70:
71: =pod
72:
73: =item &DownloadClasslist()
74:
75: Collects lastname, generation, middlename, firstname, PID, and section for each
76: student from their environment database. The list of students is built from
77: collecting a classlist for the course that is to be displayed.
78:
79: =over 4
80:
81: Input: $courseID, $c
82:
83: $courseID: The id of the course
84:
85: $c: The connection class that can determine if the browser has aborted. It
86: is used to short circuit this function so that it doesn't continue to
87: get information when there is no need.
88:
89: Output: \%classlist
90:
91: \%classlist: A pointer to a hash containing the following data:
92:
93: -A list of student name:domain (as keys) (known below as $name)
94:
95: -A hash pointer for each student containing lastname, generation, firstname,
96: middlename, and PID : Key is $name.'studentInformation'
97:
98: -A hash pointer to each students section data : Key is $name.section
99:
100: =back
101:
102: =cut
103:
104: sub DownloadClasslist {
105: my ($courseID, $lastDownloadTime, $c)=@_;
106: my ($courseDomain,$courseNumber)=split(/\_/,$courseID);
107: my %classlist;
108:
109: # my $modifiedTime = &GetFileTimestamp($courseDomain, $courseNumber,
110: # 'classlist.db',
111: # $Apache::lonnet::perlvar{'lonUsersDir'});
112:
113: # if($lastDownloadTime ne 'Not downloaded' &&
114: # $lastDownloadTime >= $modifiedTime && $modifiedTime >= 0) {
115: # $classlist{'lastDownloadTime'}=time;
116: # $classlist{'UpToDate'} = 'true';
117: # return \%classlist;
118: # }
119:
120: %classlist=&Apache::lonnet::dump('classlist',$courseDomain, $courseNumber);
121: my ($checkForError)=keys (%classlist);
122: if($checkForError =~ /^(con_lost|error|no_such_host)/i) {
123: return \%classlist;
124: }
125:
126: foreach my $name (keys(%classlist)) {
127: if($c->aborted()) {
128: $classlist{'error'}='aborted';
129: return \%classlist;
130: }
131:
132: my ($studentName,$studentDomain) = split(/\:/,$name);
133: # Download student environment data, specifically the full name and id.
134: my %studentInformation=&Apache::lonnet::get('environment',
135: ['lastname','generation',
136: 'firstname','middlename',
137: 'id'],
138: $studentDomain,
139: $studentName);
140: $classlist{$name.':studentInformation'}=\%studentInformation;
141:
142: if($c->aborted()) {
143: $classlist{'error'}='aborted';
144: return \%classlist;
145: }
146:
147: #Section
148: my %section=&Apache::lonnet::dump('roles',$studentDomain,$studentName);
149: $classlist{$name.':sections'}=\%section;
150: }
151:
152: $classlist{'UpToDate'} = 'false';
153: $classlist{'lastDownloadTime'}=time;
154:
155: return \%classlist;
156: }
157:
158: =pod
159:
160: =item &DownloadCourseInformation()
161:
162: Dump of all the course information for a single student. There is no
163: pruning of data, it is all stored in a hash and returned. It also
164: checks the timestamp of the students course database file and only downloads
165: if it has been modified since the last download.
166:
167: =over 4
168:
169: Input: $name, $courseID
170:
171: $name: student name:domain
172:
173: $courseID: The id of the course
174:
175: Output: \%courseData
176:
177: \%courseData: A hash pointer to the raw data from the student's course
178: database.
179:
180: =back
181:
182: =cut
183:
184: sub DownloadCourseInformation {
185: my ($namedata,$courseID,$lastDownloadTime)=@_;
186: my %courseData;
187: my ($name,$domain) = split(/\:/,$namedata);
188:
189: # my $modifiedTime = &GetFileTimestamp($domain, $name,
190: # $courseID.'.db',
191: # $Apache::lonnet::perlvar{'lonUsersDir'});
192: # if($lastDownloadTime >= $modifiedTime) {
193: # $courseData{'lastDownloadTime'}=time;
194: # $courseData{'UpToDate'} = 'true';
195: # return \%courseData;
196: # }
197:
198: # Download course data
199: %courseData=&Apache::lonnet::dump($courseID, $domain, $name);
200: $courseData{'UpToDate'} = 'false';
201: $courseData{'lastDownloadTime'}=time;
202: return \%courseData;
203: }
204:
205: # ----- END DOWNLOAD INFORMATION ---------------------------------------
206:
207: =pod
208:
209: =head1 PROCESSING FUNCTIONS
210:
211: These functions process all the data for all the students. Also, they
212: are the only functions that access the cache database for writing. Thus
213: they are the only functions that cache data. The downloading and caching
214: were separated to reduce problems with stopping downloading then can't
215: tie hash to database later.
216:
217: =cut
218:
219: # ----- PROCESSING FUNCTIONS ---------------------------------------
220:
221: =pod
222:
223: =item &ProcessTopResourceMap()
224:
225: Trace through the "big hash" created in rat/lonuserstate.pm::loadmap.
226: Basically, this function organizes a subset of the data and stores it in
227: cached data. The data stored is the problems, sequences, sequence titles,
228: parts of problems, and their ordering. Column width information is also
229: partially handled here on a per sequence basis.
230:
231: =over 4
232:
233: Input: $cache, $c
234:
235: $cache: A pointer to a hash to store the information
236:
237: $c: The connection class used to determine if an abort has been sent to the
238: browser
239:
240: Output: A string that contains an error message or "OK" if everything went
241: smoothly.
242:
243: =back
244:
245: =cut
246:
247: sub ProcessTopResourceMap {
248: my ($cache,$c)=@_;
249: my %hash;
250: my $fn=$ENV{'request.course.fn'};
251: if(-e "$fn.db") {
252: my $tieTries=0;
253: while($tieTries < 3) {
254: if($c->aborted()) {
255: return;
256: }
257: if(tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER,0640)) {
258: last;
259: }
260: $tieTries++;
261: sleep 1;
262: }
263: if($tieTries >= 3) {
264: return 'Coursemap undefined.';
265: }
266: } else {
267: return 'Can not open Coursemap.';
268: }
269:
270: # Initialize state machine. Set information pointing to top level map.
271: my (@sequences, @currentResource, @finishResource);
272: my ($currentSequence, $currentResourceID, $lastResourceID);
273:
274: $currentResourceID=$hash{'ids_/res/'.$ENV{'request.course.uri'}};
275: push(@currentResource, $currentResourceID);
276: $lastResourceID=-1;
277: $currentSequence=-1;
278: my $topLevelSequenceNumber = $currentSequence;
279:
280: while(1) {
281: if($c->aborted()) {
282: last;
283: }
284: # HANDLE NEW SEQUENCE!
285: #if page || sequence
286: if(defined($hash{'map_pc_'.$hash{'src_'.$currentResourceID}})) {
287: push(@sequences, $currentSequence);
288: push(@currentResource, $currentResourceID);
289: push(@finishResource, $lastResourceID);
290:
291: $currentSequence=$hash{'map_pc_'.$hash{'src_'.$currentResourceID}};
292:
293: # Mark sequence as containing problems. If it doesn't, then
294: # it will be removed when processing for this sequence is
295: # complete. This allows the problems in a sequence
296: # to be outputed before problems in the subsequences
297: if(!defined($cache->{'orderedSequences'})) {
298: $cache->{'orderedSequences'}=$currentSequence;
299: } else {
300: $cache->{'orderedSequences'}.=':'.$currentSequence;
301: }
302:
303: $lastResourceID=$hash{'map_finish_'.
304: $hash{'src_'.$currentResourceID}};
305: $currentResourceID=$hash{'map_start_'.
306: $hash{'src_'.$currentResourceID}};
307:
308: if(!($currentResourceID) || !($lastResourceID)) {
309: $currentSequence=pop(@sequences);
310: $currentResourceID=pop(@currentResource);
311: $lastResourceID=pop(@finishResource);
312: if($currentSequence eq $topLevelSequenceNumber) {
313: last;
314: }
315: }
316: }
317:
318: # Handle gradable resources: exams, problems, etc
319: $currentResourceID=~/(\d+)\.(\d+)/;
320: my $partA=$1;
321: my $partB=$2;
322: if($hash{'src_'.$currentResourceID}=~
323: /\.(problem|exam|quiz|assess|survey|form)$/ &&
324: $partA eq $currentSequence) {
325: my $Problem = &Apache::lonnet::symbclean(
326: &Apache::lonnet::declutter($hash{'map_id_'.$partA}).
327: '___'.$partB.'___'.
328: &Apache::lonnet::declutter($hash{'src_'.
329: $currentResourceID}));
330:
331: $cache->{$currentResourceID.':problem'}=$Problem;
332: if(!defined($cache->{$currentSequence.':problems'})) {
333: $cache->{$currentSequence.':problems'}=$currentResourceID;
334: } else {
335: $cache->{$currentSequence.':problems'}.=
336: ':'.$currentResourceID;
337: }
338:
339: my $meta=$hash{'src_'.$currentResourceID};
340: # $cache->{$currentResourceID.':title'}=
341: # &Apache::lonnet::metdata($meta,'title');
342: $cache->{$currentResourceID.':title'}=
343: $hash{'title_'.$currentResourceID};
344:
345: # Get Parts for problem
346: foreach (split(/\,/,&Apache::lonnet::metadata($meta,'keys'))) {
347: if($_=~/^stores\_(\d+)\_tries$/) {
348: my $Part=&Apache::lonnet::metadata($meta,$_.'.part');
349: if(!defined($cache->{$currentSequence.':'.
350: $currentResourceID.':parts'})) {
351: $cache->{$currentSequence.':'.$currentResourceID.
352: ':parts'}=$Part;
353: } else {
354: $cache->{$currentSequence.':'.$currentResourceID.
355: ':parts'}.=':'.$Part;
356: }
357: foreach (split(/\,/,
358: &Apache::lonnet::metadata($meta,'packages'))) {
359: if($_=~/^optionresponse\_($Part)\_(\w+)$/) {
360: if(defined($cache->{'OptionResponses'})) {
361: $cache->{'OptionResponses'}.= ':::'.
362: $hash{'src_'.$currentResourceID}.'::'.
363: $hash{'title_'.$currentResourceID}.'::'.
364: $Part.'::'.$Problem;
365: } else {
366: $cache->{'OptionResponses'}=
367: $hash{'src_'.$currentResourceID}.'::'.
368: $hash{'title_'.$currentResourceID}.'::'.
369: $Part.'::'.$Problem;
370: }
371: }
372: }
373: }
374: }
375: }
376:
377: # if resource == finish resource, then it is the end of a sequence/page
378: if($currentResourceID eq $lastResourceID) {
379: # pop off last resource of sequence
380: $currentResourceID=pop(@currentResource);
381: $lastResourceID=pop(@finishResource);
382:
383: if(defined($cache->{$currentSequence.':problems'})) {
384: # Capture sequence information here
385: $cache->{$currentSequence.':title'}=
386: $hash{'title_'.$currentResourceID};
387: $cache->{$currentSequence.':source'}=
388: $hash{'src_'.$currentResourceID};
389:
390: my $totalProblems=0;
391: foreach my $currentProblem (split(/\:/,
392: $cache->{$currentSequence.
393: ':problems'})) {
394: foreach (split(/\:/,$cache->{$currentSequence.':'.
395: $currentProblem.
396: ':parts'})) {
397: $totalProblems++;
398: }
399: }
400: my @titleLength=split(//,$cache->{$currentSequence.
401: ':title'});
402: # $extra is 3 for problems correct and 3 for space
403: # between problems correct and problem output
404: my $extra = 6;
405: if(($totalProblems + $extra) > (scalar @titleLength)) {
406: $cache->{$currentSequence.':columnWidth'}=
407: $totalProblems + $extra;
408: } else {
409: $cache->{$currentSequence.':columnWidth'}=
410: (scalar @titleLength);
411: }
412: } else {
413: # Remove sequence from list, if it contains no problems to
414: # display.
415: $cache->{'orderedSequences'}=~s/$currentSequence//;
416: $cache->{'orderedSequences'}=~s/::/:/g;
417: $cache->{'orderedSequences'}=~s/^:|:$//g;
418: }
419:
420: $currentSequence=pop(@sequences);
421: if($currentSequence eq $topLevelSequenceNumber) {
422: last;
423: }
424: }
425:
426: # MOVE!!!
427: # move to next resource
428: unless(defined($hash{'to_'.$currentResourceID})) {
429: # big problem, need to handle. Next is probably wrong
430: last;
431: }
432: my @nextResources=();
433: foreach (split(/\,/,$hash{'to_'.$currentResourceID})) {
434: push(@nextResources, $hash{'goesto_'.$_});
435: }
436: push(@currentResource, @nextResources);
437: # Set the next resource to be processed
438: $currentResourceID=pop(@currentResource);
439: }
440:
441: unless (untie(%hash)) {
442: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
443: "Could not untie coursemap $fn (browse)".
444: ".</font>");
445: }
446:
447: return 'OK';
448: }
449:
450: =pod
451:
452: =item &ProcessClasslist()
453:
454: Taking the class list dumped from &DownloadClasslist(), all the
455: students and their non-class information is processed using the
456: &ProcessStudentInformation() function. A date stamp is also recorded for
457: when the data was processed.
458:
459: Takes data downloaded for a student and breaks it up into managable pieces and
460: stored in cache data. The username, domain, class related date, PID,
461: full name, and section are all processed here.
462:
463:
464: =over 4
465:
466: Input: $cache, $classlist, $courseID, $ChartDB, $c
467:
468: $cache: A hash pointer to store the data
469:
470: $classlist: The hash of data collected about a student from
471: &DownloadClasslist(). The hash contains a list of students, a pointer
472: to a hash of student information for each student, and each student's section
473: number.
474:
475: $courseID: The course ID
476:
477: $ChartDB: The name of the cache database file.
478:
479: $c: The connection class used to determine if an abort has been sent to the
480: browser
481:
482: Output: @names
483:
484: @names: An array of students whose information has been processed, and are to
485: be considered in an arbitrary order.
486:
487: =back
488:
489: =cut
490:
491: sub ProcessClasslist {
492: my ($cache,$classlist,$courseID,$c)=@_;
493: my @names=();
494:
495: $cache->{'ClasslistTimeStamp'}=$classlist->{'lastDownloadTime'};
496: if($classlist->{'UpToDate'} eq 'true') {
497: return split(/:::/,$cache->{'NamesOfStudents'});;
498: }
499:
500: foreach my $name (keys(%$classlist)) {
501: if($name =~ /\:section/ || $name =~ /\:studentInformation/ ||
502: $name eq '' || $name eq 'UpToDate' || $name eq 'lastDownloadTime') {
503: next;
504: }
505: if($c->aborted()) {
506: return ();
507: }
508: push(@names,$name);
509: my $studentInformation = $classlist->{$name.':studentInformation'},
510: my $sectionData = $classlist->{$name.':sections'},
511: my $date = $classlist->{$name},
512: my ($studentName,$studentDomain) = split(/\:/,$name);
513:
514: $cache->{$name.':username'}=$studentName;
515: $cache->{$name.':domain'}=$studentDomain;
516: if(!defined($cache->{$name.':lastDownloadTime'})) {
517: $cache->{$name.':lastDownloadTime'}='Not downloaded';
518: $cache->{$name.':updateTime'}=' Not updated';
519: }
520:
521: my ($checkForError)=keys(%$studentInformation);
522: if($checkForError =~ /^(con_lost|error|no_such_host)/i) {
523: $cache->{$name.':error'}=
524: 'Could not download student environment data.';
525: $cache->{$name.':fullname'}='';
526: $cache->{$name.':id'}='';
527: } else {
528: $cache->{$name.':fullname'}=&ProcessFullName(
529: $studentInformation->{'lastname'},
530: $studentInformation->{'generation'},
531: $studentInformation->{'firstname'},
532: $studentInformation->{'middlename'});
533: $cache->{$name.':id'}=$studentInformation->{'id'};
534: }
535:
536: my ($end, $start)=split(':',$date);
537: $courseID=~s/\_/\//g;
538: $courseID=~s/^(\w)/\/$1/;
539:
540: my $sec='';
541: foreach my $key (keys (%$sectionData)) {
542: my $value = $sectionData->{$key};
543: if ($key=~/^$courseID(?:\/)*(\w+)*\_st$/) {
544: my $tempsection=$1;
545: if($key eq $courseID.'_st') {
546: $tempsection='';
547: }
548: my ($dummy,$roleend,$rolestart)=split(/\_/,$value);
549: if($roleend eq $end && $rolestart eq $start) {
550: $sec = $tempsection;
551: last;
552: }
553: }
554: }
555:
556: my $status='Expired';
557: if(((!$end) || time < $end) && ((!$start) || (time > $start))) {
558: $status='Active';
559: }
560: $cache->{$name.':Status'}=$status;
561: $cache->{$name.':section'}=$sec;
562: }
563:
564: $cache->{'ClasslistTimestamp'}=time;
565: $cache->{'NamesOfStudents'}=join(':::',@names);
566:
567: return @names;
568: }
569:
570: =pod
571:
572: =item &ProcessStudentData()
573:
574: Takes the course data downloaded for a student in
575: &DownloadCourseInformation() and breaks it up into key value pairs
576: to be stored in the cached data. The keys are comprised of the
577: $username:$domain:$keyFromCourseDatabase. The student username:domain is
578: stored away signifying that the student's information has been downloaded and
579: can be reused from cached data.
580:
581: =over 4
582:
583: Input: $cache, $courseData, $name
584:
585: $cache: A hash pointer to store data
586:
587: $courseData: A hash pointer that points to the course data downloaded for a
588: student.
589:
590: $name: username:domain
591:
592: Output: None
593:
594: *NOTE: There is no output, but an error message is stored away in the cache
595: data. This is checked in &FormatStudentData(). The key username:domain:error
596: will only exist if an error occured. The error is an error from
597: &DownloadCourseInformation().
598:
599: =back
600:
601: =cut
602:
603: sub ProcessStudentData {
604: my ($cache,$courseData,$name)=@_;
605:
606: if($courseData->{'UpToDate'} eq 'true') {
607: $cache->{$name.':lastDownloadTime'}=$courseData->{'lastDownloadTime'};
608: if($courseData->{'lastDownloadTime'} eq 'Not downloaded') {
609: $cache->{$name.':updateTime'} = ' Not updated';
610: } else {
611: $cache->{$name.':updateTime'}=
612: localtime($courseData->{'lastDownloadTime'});
613: }
614: return;
615: }
616:
617: my @courseKeys = keys(%$courseData);
618:
619: foreach (@courseKeys) {
620: if(/^(con_lost|error|no_such_host)/i) {
621: $cache->{$name.':error'}='Could not download course data.';
622: return;
623: }
624: }
625:
626: $cache->{$name.':lastDownloadTime'}=$courseData->{'lastDownloadTime'};
627: if($courseData->{'lastDownloadTime'} eq 'Not downloaded') {
628: $cache->{$name.':updateTime'} = ' Not updated';
629: } else {
630: $cache->{$name.':updateTime'}=
631: localtime($courseData->{'lastDownloadTime'});
632: }
633: foreach (@courseKeys) {
634: $cache->{$name.':'.$_}=$courseData->{$_};
635: }
636:
637: return;
638: }
639:
640: sub LoadDiscussion {
641: my ( $courseID)=@_;
642: my %Discuss=();
643: my %contrib=&Apache::lonnet::dump(
644: $courseID,
645: $ENV{'course.'.$courseID.'.domain'},
646: $ENV{'course.'.$courseID.'.num'});
647:
648: #my %contrib=&DownloadCourseInformation($name, $courseID, 0);
649:
650: foreach my $temp(keys %contrib) {
651: if ($temp=~/^version/) {
652: my $ver=$contrib{$temp};
653: my ($dummy,$prb)=split(':',$temp);
654: for (my $idx=1; $idx<=$ver; $idx++ ) {
655: my $name=$contrib{"$idx:$prb:sendername"};
656: $Discuss{"$name:$prb"}=$idx;
657: }
658: }
659: }
660:
661: return \%Discuss;
662: }
663:
664: # ----- END PROCESSING FUNCTIONS ---------------------------------------
665:
666: =pod
667:
668: =head1 HELPER FUNCTIONS
669:
670: These are just a couple of functions do various odd and end
671: jobs.
672:
673: =cut
674:
675: # ----- HELPER FUNCTIONS -----------------------------------------------
676:
677: =pod
678:
679: =item &ProcessFullName()
680:
681: Takes lastname, generation, firstname, and middlename (or some partial
682: set of this data) and returns the full name version as a string. Format
683: is Lastname generation, firstname middlename or a subset of this.
684:
685: =cut
686:
687: sub ProcessFullName {
688: my ($lastname, $generation, $firstname, $middlename)=@_;
689: my $Str = '';
690:
691: if($lastname ne '') {
692: $Str .= $lastname.' ';
693: if($generation ne '') {
694: $Str .= $generation;
695: } else {
696: chop($Str);
697: }
698: $Str .= ', ';
699: if($firstname ne '') {
700: $Str .= $firstname.' ';
701: }
702: if($middlename ne '') {
703: $Str .= $middlename;
704: } else {
705: chop($Str);
706: if($firstname eq '') {
707: chop($Str);
708: }
709: }
710: } else {
711: if($firstname ne '') {
712: $Str .= $firstname.' ';
713: }
714: if($middlename ne '') {
715: $Str .= $middlename.' ';
716: }
717: if($generation ne '') {
718: $Str .= $generation;
719: } else {
720: chop($Str);
721: }
722: }
723:
724: return $Str;
725: }
726:
727: =pod
728:
729: =item &TestCacheData()
730:
731: Determine if the cache database can be accessed with a tie. It waits up to
732: ten seconds before returning failure. This function exists to help with
733: the problems with stopping the data download. When an abort occurs and the
734: user quickly presses a form button and httpd child is created. This
735: child needs to wait for the other to finish (hopefully within ten seconds).
736:
737: =over 4
738:
739: Input: $ChartDB
740:
741: $ChartDB: The name of the cache database to be opened
742:
743: Output: -1, 0, 1
744:
745: -1: Couldn't tie database
746: 0: Use cached data
747: 1: New cache database created, use that.
748:
749: =back
750:
751: =cut
752:
753: sub TestCacheData {
754: my ($ChartDB,$isRecalculate,$totalDelay)=@_;
755: my $isCached=-1;
756: my %testData;
757: my $tieTries=0;
758:
759: if(!defined($totalDelay)) {
760: $totalDelay = 10;
761: }
762:
763: if ((-e "$ChartDB") && (!$isRecalculate)) {
764: $isCached = 1;
765: } else {
766: $isCached = 0;
767: }
768:
769: while($tieTries < $totalDelay) {
770: my $result=0;
771: if($isCached) {
772: $result=tie(%testData,'GDBM_File',$ChartDB,&GDBM_READER,0640);
773: } else {
774: $result=tie(%testData,'GDBM_File',$ChartDB,&GDBM_NEWDB,0640);
775: }
776: if($result) {
777: last;
778: }
779: $tieTries++;
780: sleep 1;
781: }
782: if($tieTries >= $totalDelay) {
783: return -1;
784: }
785:
786: untie(%testData);
787:
788: return $isCached;
789: }
790:
791: sub GetFileTimestamp {
792: my ($studentDomain,$studentName,$filename,$root)=@_;
793: $studentDomain=~s/\W//g;
794: $studentName=~s/\W//g;
795: my $subdir=$studentName.'__';
796: $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
797: my $proname="$studentDomain/$subdir/$studentName";
798: $proname .= '/'.$filename;
799: my @dir = &Apache::lonnet::dirlist($proname, $studentDomain, $studentName,
800: $root);
801: my $fileStat = $dir[0];
802: my @stats = split('&', $fileStat);
803: if(@stats) {
804: return $stats[9];
805: } else {
806: return -1;
807: }
808: }
809:
810: # ----- END HELPER FUNCTIONS --------------------------------------------
811:
812: 1;
813: __END__
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