From 2625817ec555f8e8e75e093ad272b49f5bdc53fc Mon Sep 17 00:00:00 2001 From: Jared Camins-Esakov Date: Sat, 19 Jan 2013 20:28:58 -0500 Subject: [PATCH] Bug 8089: Cache sysprefs with Koha::Cache::Object This patch replaces the %sysprefs hash variable with a Koha::Cache::Object-tied hash that allows the user to cache sysprefs in memcached, fastmmap, or memory. To test: 1) Enable the cache as described on bug 9434. 2) Try viewing some pages in the OPAC and staff client. If the syspref caching isn't working, you'll be redirected to the web installer (in the staff client) or be shown the maintenance page (in the OPAC). 3) Disable the cache by unsetting the CACHING_SYSTEM environment variable. 4) Try viewing some pages in the OPAC and staff client. If the syspref caching isn't working, you'll be redirected to the web installer (in the staff client) or be shown the maintenance page (in the OPAC). Note that this will not improve performance. It does, however, eliminate the problem of sysprefs not getting updated in all threads in multi-threaded environments. Signed-off-by: Jonathan Druart --- C4/Context.pm | 66 +++++++++++++++++++++++++++++++++++++++++---------------- 1 file changed, 48 insertions(+), 18 deletions(-) diff --git a/C4/Context.pm b/C4/Context.pm index 4e6c5fb..c66b22d 100644 --- a/C4/Context.pm +++ b/C4/Context.pm @@ -19,6 +19,8 @@ package C4::Context; use strict; use warnings; use vars qw($VERSION $AUTOLOAD $context @context_stack $servers $memcached $ismemcached); +use Koha::Cache; +use Carp; BEGIN { if ($ENV{'HTTP_USER_AGENT'}) { @@ -534,28 +536,55 @@ with this method. # FIXME: running this under mod_perl will require a means of # flushing the caching mechanism. -my %sysprefs; +my $sysprefs; my $use_syspref_cache = 1; +my $cache; sub preference { my $self = shift; my $var = lc(shift); # The system preference to return - if ($use_syspref_cache && exists $sysprefs{$var}) { - return $sysprefs{$var}; + unless (defined $sysprefs) { + unless ($cache) { + $cache = Koha::Cache->new(); + } + $sysprefs = $cache->create_hash( + { + 'key' => 'syspref', + 'allowupdate' => 1, + 'cache_type' => $use_syspref_cache ? '' : 'null', + 'preload' => sub { + my $dbh = C4::Context->dbh or return {}; + my $vars = $dbh->selectall_arrayref("SELECT variable, value FROM systempreferences"); + my %sysprefs = (); + foreach my $row (@$vars) { + $sysprefs{$row->[0]} = $row->[1]; + } + return \%sysprefs; + }, + 'constructor' => sub { + + # Look up systempreferences.variable==$var + my $var = pop; + my $sysprefs = pop || {}; + my $dbh = C4::Context->dbh or return 0; + my $sql = +"SELECT value FROM systempreferences WHERE variable=? LIMIT 1"; + $ENV{DEBUG} && carp "Retrieving syspref $var from database"; + my $sth = $dbh->prepare_cached($sql); + $sth->execute($var); + my $res = $sth->fetchrow_hashref; + if ($res && $res->{'value'}) { + $sysprefs->{$var} = $res->{'value'}; + } else { + $sysprefs->{$var} = ''; + } + return $sysprefs; + }, + } + ); } - - my $dbh = C4::Context->dbh or return 0; - - # Look up systempreferences.variable==$var - my $sql = <<'END_SQL'; - SELECT value - FROM systempreferences - WHERE variable=? - LIMIT 1 -END_SQL - $sysprefs{$var} = $dbh->selectrow_array( $sql, {}, $var ); - return $sysprefs{$var}; + return $sysprefs->{$var}; } sub boolean_preference { @@ -591,7 +620,7 @@ used with Plack and other persistent environments. sub disable_syspref_cache { my ($self) = @_; $use_syspref_cache = 0; - $self->clear_syspref_cache(); + $self->clear_syspref_cache() if defined($sysprefs); } =head2 clear_syspref_cache @@ -605,7 +634,8 @@ will not be seen by this process. =cut sub clear_syspref_cache { - %sysprefs = (); + %{$sysprefs} = (); + return; } =head2 set_preference @@ -636,7 +666,7 @@ sub set_preference { " ); if($sth->execute( $var, $value )) { - $sysprefs{$var} = $value; + $sysprefs->{$var} = $value; } $sth->finish; } -- 1.7.10.4