C4/HoldsQueue.pm

   1 package C4::HoldsQueue;
   2
   3 # Copyright 2011 Catalyst IT
   4 #
   5 # This file is part of Koha.
   6 #
   7 # Koha is free software; you can redistribute it and/or modify it under the
   8 # terms of the GNU General Public License as published by the Free Software
   9 # Foundation; either version 2 of the License, or (at your option) any later
  10 # version.
  11 #
  12 # Koha is distributed in the hope that it will be useful, but WITHOUT ANY
  13 # WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  14 # A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License along
  17 # with Koha; if not, write to the Free Software Foundation, Inc.,
  18 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19
  20 # FIXME: expand perldoc, explain intended logic
  21
  22 use strict;
  23 use warnings;
  24
  25 use C4::Context;
  26 use C4::Search;
  27 use C4::Items;
  28 use C4::Branch;
  29 use C4::Circulation;
  30 use C4::Members;
  31 use C4::Biblio;
  32 use C4::Dates qw/format_date/;
  33
  34 use List::Util qw(shuffle);
  35 use Data::Dumper;
  36
  37 use vars qw($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS);
  38 BEGIN {
  39     $VERSION = 3.03;
  40     require Exporter;
  41     @ISA = qw(Exporter);
  42     @EXPORT_OK = qw(
  43         &CreateQueue
  44         &GetHoldsQueueItems
  45
  46         &TransportCostMatrix
  47         &UpdateTransportCostMatrix
  48      );
  49 }
  50
  51 # XXX This is not safe in a persistant environment
  52 my $dbh   = C4::Context->dbh;
  53
  54 =head1 FUNCTIONS
  55
  56 =head2 TransportCostMatrix
  57
  58   TransportCostMatrix();
  59
  60 Returns Transport Cost Matrix as a hashref <to branch code> => <from branch code> => cost
  61
  62 =cut
  63
  64 sub TransportCostMatrix {
  65     my $transport_costs = $dbh->selectall_arrayref("SELECT * FROM transport_cost",{ Slice => {} });
  66
  67     my %transport_cost_matrix;
  68     foreach (@$transport_costs) {
  69         my $from = $_->{frombranch};
  70         my $to = $_->{tobranch};
  71         my $cost = $_->{cost};
  72         my $disabled = $_->{disable_transfer};
  73         $transport_cost_matrix{$to}{$from} = { cost => $cost, disable_transfer => $disabled };
  74     }
  75     return \%transport_cost_matrix;
  76 }
  77
  78 =head2 UpdateTransportCostMatrix
  79
  80   UpdateTransportCostMatrix($records);
  81
  82 Updates full Transport Cost Matrix table. $records is an arrayref of records.
  83 Records: { frombranch => <code>, tobranch => <code>, cost => <figure>, disable_transfer => <0,1> }
  84
  85 =cut
  86
  87 sub UpdateTransportCostMatrix {
  88     my ($records) = @_;
  89
  90     my $sth = $dbh->prepare("INSERT INTO transport_cost (frombranch, tobranch, cost, disable_transfer) VALUES (?, ?, ?, ?)");
  91
  92     $dbh->do("TRUNCATE TABLE transport_cost");
  93     foreach (@$records) {
  94         my $cost = $_->{cost};
  95         my $from = $_->{frombranch};
  96         my $to = $_->{tobranch};
  97         if ($_->{disable_transfer}) {
  98             $cost ||= 0;
  99         }
 100         elsif ( !defined ($cost) || ($cost !~ m/(0|[1-9][0-9]*)(\.[0-9]*)?/o) ) {
 101             warn  "Invalid $from -> $to cost $cost - must be a number >= 0, disablig";
 102             $cost = 0;
 103             $_->{disable_transfer} = 1;
 104         }
 105         $sth->execute( $from, $to, $cost, $_->{disable_transfer} ? 1 : 0 );
 106     }
 107 }
 108
 109 =head2 GetHoldsQueueItems
 110
 111   GetHoldsQueueItems($branch);
 112
 113 Returns hold queue for a holding branch. If branch is omitted, then whole queue is returned
 114
 115 =cut
 116
 117 sub GetHoldsQueueItems {
 118     my ($branchlimit) = @_;
 119
 120     my @bind_params = ();
 121     my $query = q/SELECT tmp_holdsqueue.*, biblio.author, items.ccode, items.location, items.enumchron, items.cn_sort, biblioitems.publishercode,biblio.copyrightdate,biblioitems.publicationyear,biblioitems.pages,biblioitems.size,biblioitems.publicationyear,biblioitems.isbn,items.copynumber
 122                   FROM tmp_holdsqueue
 123                        JOIN biblio      USING (biblionumber)
 124                   LEFT JOIN biblioitems USING (biblionumber)
 125                   LEFT JOIN items       USING (  itemnumber)
 126                 /;
 127     if ($branchlimit) {
 128         $query .=" WHERE tmp_holdsqueue.holdingbranch = ?";
 129         push @bind_params, $branchlimit;
 130     }
 131     $query .= " ORDER BY ccode, location, cn_sort, author, title, pickbranch, reservedate";
 132     my $sth = $dbh->prepare($query);
 133     $sth->execute(@bind_params);
 134     my $items = [];
 135     while ( my $row = $sth->fetchrow_hashref ){
 136         $row->{reservedate} = format_date($row->{reservedate});
 137         my $record = GetMarcBiblio($row->{biblionumber});
 138         if ($record){
 139             $row->{subtitle} = GetRecordValue('subtitle',$record,'')->[0]->{subfield};
 140             $row->{parts} = GetRecordValue('parts',$record,'')->[0]->{subfield};
 141             $row->{numbers} = GetRecordValue('numbers',$record,'')->[0]->{subfield};
 142         }
 143         push @$items, $row;
 144     }
 145     return $items;
 146 }
 147
 148 =head2 CreateQueue
 149
 150   CreateQueue();
 151
 152 Top level function that turns reserves into tmp_holdsqueue and hold_fill_targets.
 153
 154 =cut
 155
 156 sub CreateQueue {
 157
 158     $dbh->do("DELETE FROM tmp_holdsqueue");  # clear the old table for new info
 159     $dbh->do("DELETE FROM hold_fill_targets");
 160
 161     my $total_bibs            = 0;
 162     my $total_requests        = 0;
 163     my $total_available_items = 0;
 164     my $num_items_mapped      = 0;
 165
 166     my $branches_to_use;
 167     my $transport_cost_matrix;
 168     my $use_transport_cost_matrix = C4::Context->preference("UseTransportCostMatrix");
 169     if ($use_transport_cost_matrix) {
 170         $transport_cost_matrix = TransportCostMatrix();
 171         unless (keys %$transport_cost_matrix) {
 172             warn "UseTransportCostMatrix set to yes, but matrix not populated";
 173             undef $transport_cost_matrix;
 174         }
 175     }
 176     unless ($transport_cost_matrix) {
 177         $branches_to_use = load_branches_to_pull_from();
 178     }
 179
 180     my $bibs_with_pending_requests = GetBibsWithPendingHoldRequests();
 181
 182     foreach my $biblionumber (@$bibs_with_pending_requests) {
 183         $total_bibs++;
 184         my $hold_requests   = GetPendingHoldRequestsForBib($biblionumber);
 185         my $available_items = GetItemsAvailableToFillHoldRequestsForBib($biblionumber, $branches_to_use);
 186         $total_requests        += scalar(@$hold_requests);
 187         $total_available_items += scalar(@$available_items);
 188
 189         my $item_map = MapItemsToHoldRequests($hold_requests, $available_items, $branches_to_use, $transport_cost_matrix);
 190         $item_map  or next;
 191         my $item_map_size = scalar(keys %$item_map)
 192           or next;
 193
 194         $num_items_mapped += $item_map_size;
 195         CreatePicklistFromItemMap($item_map);
 196         AddToHoldTargetMap($item_map);
 197         if (($item_map_size < scalar(@$hold_requests  )) and
 198             ($item_map_size < scalar(@$available_items))) {
 199             # DOUBLE CHECK, but this is probably OK - unfilled item-level requests
 200             # FIXME
 201             #warn "unfilled requests for $biblionumber";
 202             #warn Dumper($hold_requests), Dumper($available_items), Dumper($item_map);
 203         }
 204     }
 205 }
 206
 207 =head2 GetBibsWithPendingHoldRequests
 208
 209   my $biblionumber_aref = GetBibsWithPendingHoldRequests();
 210
 211 Return an arrayref of the biblionumbers of all bibs
 212 that have one or more unfilled hold requests.
 213
 214 =cut
 215
 216 sub GetBibsWithPendingHoldRequests {
 217     my $dbh = C4::Context->dbh;
 218
 219     my $bib_query = "SELECT DISTINCT biblionumber
 220                      FROM reserves
 221                      WHERE found IS NULL
 222                      AND priority > 0
 223                      AND reservedate <= CURRENT_DATE()";
 224     my $sth = $dbh->prepare($bib_query);
 225
 226     $sth->execute();
 227     my $biblionumbers = $sth->fetchall_arrayref();
 228
 229     return [ map { $_->[0] } @$biblionumbers ];
 230 }
 231
 232 =head2 GetPendingHoldRequestsForBib
 233
 234   my $requests = GetPendingHoldRequestsForBib($biblionumber);
 235
 236 Returns an arrayref of hashrefs to pending, unfilled hold requests
 237 on the bib identified by $biblionumber.  The following keys
 238 are present in each hashref:
 239
 240     biblionumber
 241     borrowernumber
 242     itemnumber
 243     priority
 244     branchcode
 245     reservedate
 246     reservenotes
 247     borrowerbranch
 248
 249 The arrayref is sorted in order of increasing priority.
 250
 251 =cut
 252
 253 sub GetPendingHoldRequestsForBib {
 254     my $biblionumber = shift;
 255
 256     my $dbh = C4::Context->dbh;
 257
 258     my $request_query = "SELECT biblionumber, borrowernumber, itemnumber, priority, reserves.branchcode,
 259                                 reservedate, reservenotes, borrowers.branchcode AS borrowerbranch
 260                          FROM reserves
 261                          JOIN borrowers USING (borrowernumber)
 262                          WHERE biblionumber = ?
 263                          AND found IS NULL
 264                          AND priority > 0
 265                          AND reservedate <= CURRENT_DATE()
 266                          ORDER BY priority";
 267     my $sth = $dbh->prepare($request_query);
 268     $sth->execute($biblionumber);
 269
 270     my $requests = $sth->fetchall_arrayref({});
 271     return $requests;
 272
 273 }
 274
 275 =head2 GetItemsAvailableToFillHoldRequestsForBib
 276
 277   my $available_items = GetItemsAvailableToFillHoldRequestsForBib($biblionumber, $branches_ar);
 278
 279 Returns an arrayref of items available to fill hold requests
 280 for the bib identified by C<$biblionumber>.  An item is available
 281 to fill a hold request if and only if:
 282
 283     * it is not on loan
 284     * it is not withdrawn
 285     * it is not marked notforloan
 286     * it is not currently in transit
 287     * it is not lost
 288     * it is not sitting on the hold shelf
 289
 290 =cut
 291
 292 sub GetItemsAvailableToFillHoldRequestsForBib {
 293     my ($biblionumber, $branches_to_use) = @_;
 294
 295     my $dbh = C4::Context->dbh;
 296     my $items_query = "SELECT itemnumber, homebranch, holdingbranch, itemtypes.itemtype AS itype
 297                        FROM items ";
 298
 299     if (C4::Context->preference('item-level_itypes')) {
 300         $items_query .=   "LEFT JOIN itemtypes ON (itemtypes.itemtype = items.itype) ";
 301     } else {
 302         $items_query .=   "JOIN biblioitems USING (biblioitemnumber)
 303                            LEFT JOIN itemtypes USING (itemtype) ";
 304     }
 305     $items_query .=   "WHERE items.notforloan = 0
 306                        AND holdingbranch IS NOT NULL
 307                        AND itemlost = 0
 308                        AND wthdrawn = 0";
 309     $items_query .= "  AND damaged = 0" unless C4::Context->preference('AllowHoldsOnDamagedItems');
 310     $items_query .= "  AND items.onloan IS NULL
 311                        AND (itemtypes.notforloan IS NULL OR itemtypes.notforloan = 0)
 312                        AND itemnumber NOT IN (
 313                            SELECT itemnumber
 314                            FROM reserves
 315                            WHERE biblionumber = ?
 316                            AND itemnumber IS NOT NULL
 317                            AND (found IS NOT NULL OR priority = 0)
 318                         )
 319                        AND items.biblionumber = ?";
 320     $items_query .=  " AND damaged = 0 "
 321       unless C4::Context->preference('AllowHoldsOnDamagedItems');
 322
 323     my @params = ($biblionumber, $biblionumber);
 324     if ($branches_to_use && @$branches_to_use) {
 325         $items_query .= " AND holdingbranch IN (" . join (",", map { "?" } @$branches_to_use) . ")";
 326         push @params, @$branches_to_use;
 327     }
 328     my $sth = $dbh->prepare($items_query);
 329     $sth->execute(@params);
 330
 331     my $itm = $sth->fetchall_arrayref({});
 332     my @items = grep { ! scalar GetTransfers($_->{itemnumber}) } @$itm;
 333     return [ grep {
 334         my $rule = GetBranchItemRule($_->{homebranch}, $_->{itype});
 335         $_->{holdallowed} = $rule->{holdallowed} != 0
 336     } @items ];
 337 }
 338
 339 =head2 MapItemsToHoldRequests
 340
 341   MapItemsToHoldRequests($hold_requests, $available_items, $branches, $transport_cost_matrix)
 342
 343 =cut
 344
 345 sub MapItemsToHoldRequests {
 346     my ($hold_requests, $available_items, $branches_to_use, $transport_cost_matrix) = @_;
 347
 348     # handle trival cases
 349     return unless scalar(@$hold_requests) > 0;
 350     return unless scalar(@$available_items) > 0;
 351
 352     my $automatic_return = C4::Context->preference("AutomaticItemReturn");
 353
 354     # identify item-level requests
 355     my %specific_items_requested = map { $_->{itemnumber} => 1 }
 356                                    grep { defined($_->{itemnumber}) }
 357                                    @$hold_requests;
 358
 359     # group available items by itemnumber
 360     my %items_by_itemnumber = map { $_->{itemnumber} => $_ } @$available_items;
 361
 362     # items already allocated
 363     my %allocated_items = ();
 364
 365     # map of items to hold requests
 366     my %item_map = ();
 367
 368     # figure out which item-level requests can be filled
 369     my $num_items_remaining = scalar(@$available_items);
 370     foreach my $request (@$hold_requests) {
 371         last if $num_items_remaining == 0;
 372
 373         # is this an item-level request?
 374         if (defined($request->{itemnumber})) {
 375             # fill it if possible; if not skip it
 376             if (exists $items_by_itemnumber{$request->{itemnumber}} and
 377                 not exists $allocated_items{$request->{itemnumber}}) {
 378                 $item_map{$request->{itemnumber}} = {
 379                     borrowernumber => $request->{borrowernumber},
 380                     biblionumber => $request->{biblionumber},
 381                     holdingbranch =>  $items_by_itemnumber{$request->{itemnumber}}->{holdingbranch},
 382                     pickup_branch => $request->{branchcode} || $request->{borrowerbranch},
 383                     item_level => 1,
 384                     reservedate => $request->{reservedate},
 385                     reservenotes => $request->{reservenotes},
 386                 };
 387                 $allocated_items{$request->{itemnumber}}++;
 388                 $num_items_remaining--;
 389             }
 390         } else {
 391             # it's title-level request that will take up one item
 392             $num_items_remaining--;
 393         }
 394     }
 395
 396     # group available items by branch
 397     my %items_by_branch = ();
 398     foreach my $item (@$available_items) {
 399         next unless $item->{holdallowed};
 400
 401         push @{ $items_by_branch{  $automatic_return ? $item->{homebranch}
 402                                                      : $item->{holdingbranch} } }, $item
 403           unless exists $allocated_items{ $item->{itemnumber} };
 404     }
 405     return unless keys %items_by_branch;
 406
 407     # now handle the title-level requests
 408     $num_items_remaining = scalar(@$available_items) - scalar(keys %allocated_items);
 409     my $pull_branches;
 410     foreach my $request (@$hold_requests) {
 411         last if $num_items_remaining == 0;
 412         next if defined($request->{itemnumber}); # already handled these
 413
 414         # look for local match first
 415         my $pickup_branch = $request->{branchcode} || $request->{borrowerbranch};
 416         my ($itemnumber, $holdingbranch);
 417
 418         my $holding_branch_items = $automatic_return ? undef : $items_by_branch{$pickup_branch};
 419         if ( $holding_branch_items ) {
 420             foreach my $item (@$holding_branch_items) {
 421                 if ( $request->{borrowerbranch} eq $item->{homebranch} ) {
 422                     $itemnumber = $item->{itemnumber};
 423                     last;
 424                 }
 425             }
 426             $holdingbranch = $pickup_branch;
 427             $itemnumber ||= $holding_branch_items->[0]->{itemnumber};
 428         }
 429         elsif ($transport_cost_matrix) {
 430             $pull_branches = [keys %items_by_branch];
 431             $holdingbranch = least_cost_branch( $pickup_branch, $pull_branches, $transport_cost_matrix );
 432             if ( $holdingbranch ) {
 433
 434                 my $holding_branch_items = $items_by_branch{$holdingbranch};
 435                 foreach my $item (@$holding_branch_items) {
 436                     next if $request->{borrowerbranch} ne $item->{homebranch};
 437
 438                     $itemnumber = $item->{itemnumber};
 439                     last;
 440                 }
 441                 $itemnumber ||= $holding_branch_items->[0]->{itemnumber};
 442             }
 443             else {
 444                 warn "No transport costs for $pickup_branch";
 445             }
 446         }
 447
 448         unless ($itemnumber) {
 449             # not found yet, fall back to basics
 450             if ($branches_to_use) {
 451                 $pull_branches = $branches_to_use;
 452             } else {
 453                 $pull_branches = [keys %items_by_branch];
 454             }
 455             PULL_BRANCHES:
 456             foreach my $branch (@$pull_branches) {
 457                 my $holding_branch_items = $items_by_branch{$branch}
 458                   or next;
 459
 460                 $holdingbranch ||= $branch;
 461                 foreach my $item (@$holding_branch_items) {
 462                     next if $pickup_branch ne $item->{homebranch};
 463
 464                     $itemnumber = $item->{itemnumber};
 465                     $holdingbranch = $branch;
 466                     last PULL_BRANCHES;
 467                 }
 468             }
 469             $itemnumber ||= $items_by_branch{$holdingbranch}->[0]->{itemnumber}
 470               if $holdingbranch;
 471         }
 472
 473         if ($itemnumber) {
 474             my $holding_branch_items = $items_by_branch{$holdingbranch}
 475               or die "Have $itemnumber, $holdingbranch, but no items!";
 476             @$holding_branch_items = grep { $_->{itemnumber} != $itemnumber } @$holding_branch_items;
 477             delete $items_by_branch{$holdingbranch} unless @$holding_branch_items;
 478
 479             $item_map{$itemnumber} = {
 480                 borrowernumber => $request->{borrowernumber},
 481                 biblionumber => $request->{biblionumber},
 482                 holdingbranch => $holdingbranch,
 483                 pickup_branch => $pickup_branch,
 484                 item_level => 0,
 485                 reservedate => $request->{reservedate},
 486                 reservenotes => $request->{reservenotes},
 487             };
 488             $num_items_remaining--;
 489         }
 490     }
 491     return \%item_map;
 492 }
 493
 494 =head2 CreatePickListFromItemMap
 495
 496 =cut
 497
 498 sub CreatePicklistFromItemMap {
 499     my $item_map = shift;
 500
 501     my $dbh = C4::Context->dbh;
 502
 503     my $sth_load=$dbh->prepare("
 504         INSERT INTO tmp_holdsqueue (biblionumber,itemnumber,barcode,surname,firstname,phone,borrowernumber,
 505                                     cardnumber,reservedate,title, itemcallnumber,
 506                                     holdingbranch,pickbranch,notes, item_level_request)
 507         VALUES (?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)
 508     ");
 509
 510     foreach my $itemnumber  (sort keys %$item_map) {
 511         my $mapped_item = $item_map->{$itemnumber};
 512         my $biblionumber = $mapped_item->{biblionumber};
 513         my $borrowernumber = $mapped_item->{borrowernumber};
 514         my $pickbranch = $mapped_item->{pickup_branch};
 515         my $holdingbranch = $mapped_item->{holdingbranch};
 516         my $reservedate = $mapped_item->{reservedate};
 517         my $reservenotes = $mapped_item->{reservenotes};
 518         my $item_level = $mapped_item->{item_level};
 519
 520         my $item = GetItem($itemnumber);
 521         my $barcode = $item->{barcode};
 522         my $itemcallnumber = $item->{itemcallnumber};
 523
 524         my $borrower = GetMember('borrowernumber'=>$borrowernumber);
 525         my $cardnumber = $borrower->{'cardnumber'};
 526         my $surname = $borrower->{'surname'};
 527         my $firstname = $borrower->{'firstname'};
 528         my $phone = $borrower->{'phone'};
 529
 530         my $bib = GetBiblioData($biblionumber);
 531         my $title = $bib->{title};
 532
 533         $sth_load->execute($biblionumber, $itemnumber, $barcode, $surname, $firstname, $phone, $borrowernumber,
 534                            $cardnumber, $reservedate, $title, $itemcallnumber,
 535                            $holdingbranch, $pickbranch, $reservenotes, $item_level);
 536     }
 537 }
 538
 539 =head2 AddToHoldTargetMap
 540
 541 =cut
 542
 543 sub AddToHoldTargetMap {
 544     my $item_map = shift;
 545
 546     my $dbh = C4::Context->dbh;
 547
 548     my $insert_sql = q(
 549         INSERT INTO hold_fill_targets (borrowernumber, biblionumber, itemnumber, source_branchcode, item_level_request)
 550                                VALUES (?, ?, ?, ?, ?)
 551     );
 552     my $sth_insert = $dbh->prepare($insert_sql);
 553
 554     foreach my $itemnumber (keys %$item_map) {
 555         my $mapped_item = $item_map->{$itemnumber};
 556         $sth_insert->execute($mapped_item->{borrowernumber}, $mapped_item->{biblionumber}, $itemnumber,
 557                              $mapped_item->{holdingbranch}, $mapped_item->{item_level});
 558     }
 559 }
 560
 561 # Helper functions, not part of any interface
 562
 563 sub _trim {
 564     return $_[0] unless $_[0];
 565     $_[0] =~ s/^\s+//;
 566     $_[0] =~ s/\s+$//;
 567     $_[0];
 568 }
 569
 570 sub load_branches_to_pull_from {
 571     my $static_branch_list = C4::Context->preference("StaticHoldsQueueWeight")
 572       or return;
 573
 574     my @branches_to_use = map _trim($_), split /,/, $static_branch_list;
 575
 576     @branches_to_use = shuffle(@branches_to_use) if  C4::Context->preference("RandomizeHoldsQueueWeight");
 577
 578     return \@branches_to_use;
 579 }
 580
 581 sub least_cost_branch {
 582
 583     #$from - arrayref
 584     my ($to, $from, $transport_cost_matrix) = @_;
 585
 586 # Nothing really spectacular: supply to branch, a list of potential from branches
 587 # and find the minimum from - to value from the transport_cost_matrix
 588     return $from->[0] if @$from == 1;
 589
 590     my ($least_cost, @branch);
 591     foreach (@$from) {
 592         my $cell = $transport_cost_matrix->{$to}{$_};
 593         next if $cell->{disable_transfer};
 594
 595         my $cost = $cell->{cost};
 596         next unless defined $cost; # XXX should this be reported?
 597
 598         unless (defined $least_cost) {
 599             $least_cost = $cost;
 600             push @branch, $_;
 601             next;
 602         }
 603
 604         next if $cost > $least_cost;
 605
 606         if ($cost == $least_cost) {
 607             push @branch, $_;
 608             next;
 609         }
 610
 611         @branch = ($_);
 612         $least_cost = $cost;
 613     }
 614
 615     return $branch[0];
 616
 617     # XXX return a random @branch with minimum cost instead of the first one;
 618     # return $branch[0] if @branch == 1;
 619 }
 620
 621
 622 1;