Attachment 60189 Details for Bug 17941 – Bug 17941 avoid scanning the full cartesian product

[patch] Bug 17941 avoid scanning the full cartesian product

Bug-17941-avoid-scanning-the-full-cartesian-produc.patch (text/plain), 2.20 KB, created by Francesco Rivetti on 2017-02-14 11:18:10 UTC

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Creator: Francesco Rivetti

Created: 2017-02-14 11:18:10 UTC

Size: 2.20 KB

patch

obsolete

>From cdaedc195bc400c1744c3265f0e293fddd0649b2 Mon Sep 17 00:00:00 2001
>From: Francesco Rivetti <oha@oha.it>
>Date: Tue, 14 Feb 2017 11:13:51 +0100
>Subject: [PATCH] Bug 17941 avoid scanning the full cartesian product
>
>when a item match a borrower, there is no point in checking the
>other borrowers
>---
> C4/Circulation.pm | 29 ++++++++++++++---------------
> 1 file changed, 14 insertions(+), 15 deletions(-)
>
>diff --git a/C4/Circulation.pm b/C4/Circulation.pm
>index 330923e..c90dda2 100644
>--- a/C4/Circulation.pm
>+++ b/C4/Circulation.pm
>@@ -2679,24 +2679,23 @@ sub CanBookBeRenewed : PureFunction {
>             # can be filled with available items. We can get the union of the sets simply
>             # by pushing all the elements onto an array and removing the duplicates.
>             my @reservable;
>-            foreach my $b (@borrowernumbers) {
>-                my ($borr) = C4::Members::GetMember( borrowernumber => $b);
>-                foreach my $i (@itemnumbers) {
>-                    my $item = GetItem($i);
>-                    if (  !IsItemOnHoldAndFound($i)
>-                        && IsAvailableForItemLevelRequest( $item, $borr )
>-                        && CanItemBeReserved( $b, $i ) )
>-                    {
>-                        push( @reservable, $i );
>+            my %borrowers;
>+            ITEM: foreach my $i (@itemnumbers) {
>+                my $item = GetItem($i);
>+                next if IsItemOnHoldAndFound($i);
>+                for my $b (@borrowernumbers) {
>+                    my $borr = $borrowers{$b}//= C4::Members::GetMember(borrowernumber => $_);
>+                    next unless IsAvailableForItemLevelRequest($item, $borr);
>+                    next unless CanItemBeReserved($b,$i);
>+
>+                    push @reservable;
>+                    if (@reservable >= @borrowernumbers) {
>+                        $resfound = 0;
>+                        last ITEM;
>                     }
>+                    last;
>                 }
>             }
>-
>-            @reservable = uniq(@reservable);
>-
>-            if ( @reservable >= @borrowernumbers ) {
>-                $resfound = 0;
>-            }
>         }
>     }
>     return ( 0, "on_reserve" ) if $resfound;    # '' when no hold was found
>-- 
>2.7.4

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