Item12592: Add checker for Cache methods

Makes the assumption that any Foswiki::PageCache::DBI::* class must be
backed up by the corresponding DBD::* class.

Needs some further consideration / checking for DBI::Generic.

git-svn-id: http://svn.foswiki.org/trunk@16887 0b4bb1d4-4e5a-0410-9cc4-b2b747904278

core/lib/Foswiki.spec

@@ -1561,7 +1561,7 @@ $Foswiki::cfg{Cache}{WebDependencies} =
 $Foswiki::cfg{Cache}{DependencyFilter} =
   '$Foswiki::cfg{SystemWebName}\..*|$Foswiki::cfg{TrashWebName}\..*|TWiki\..*';
 
-# **SELECTCLASS Foswiki::PageCache::DBI::*  DISPLAY_IF {Cache}{Enabled}**
+# **SELECTCLASS Foswiki::PageCache::DBI::*  FEEDBACK=AUTO DISPLAY_IF {Cache}{Enabled}**
 # Select the cache implementation. The default page cache implementation
 # is based on DBI (http://dbi.perl.org) which requires a working DBI driver to
 # connect to a database. This database will hold all cached data as well as the

core/lib/Foswiki/Configure/Checkers/Cache/Implementation.pm

@@ -0,0 +1,54 @@
+# See bottom of file for license and copyright information
+package Foswiki::Configure::Checkers::Cache::Implementation;
+
+use strict;
+use warnings;
+
+use Foswiki::Configure::Checker ();
+our @ISA = ('Foswiki::Configure::Checker');
+
+use Foswiki::Configure::Dependency;
+
+sub check {
+    my $this = shift;
+    my $e    = '';
+
+    my $implementation = $Foswiki::cfg{Cache}{Implementation} || '';
+    my ($module) = $implementation =~ m/Foswiki::PageCache::(.*)/;
+
+    return unless ( $module && ( $module ne 'DBI::Generic' ) );
+
+    $module =~ s/^DBI::/DBD::/;
+
+    $e =
+      $this->checkPerlModule( $module, "Required to use $implementation.", 0 );
+
+    return ( ( $e =~ m/Not installed./ ) ? $this->ERROR($e) : $this->NOTE($e) );
+}
+
+1;
+__END__
+Foswiki - The Free and Open Source Wiki, http://foswiki.org/
+
+Copyright (C) 2013 Foswiki Contributors. Foswiki Contributors
+are listed in the AUTHORS file in the root of this distribution.
+NOTE: Please extend that file, not this notice.
+
+Additional copyrights apply to some or all of the code in this
+file as follows:
+
+Copyright (C) 2000-2006 TWiki Contributors. All Rights Reserved.
+TWiki Contributors are listed in the AUTHORS file in the root
+of this distribution. NOTE: Please extend that file, not this notice.
+
+This program is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public License
+as published by the Free Software Foundation; either version 2
+of the License, or (at your option) any later version. For
+more details read LICENSE in the root of this distribution.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+As per the GPL, removal of this notice is prohibited.

core/lib/Foswiki/Contrib/core/MANIFEST

@@ -507,6 +507,7 @@ lib/Foswiki/Configure/Checkers/ConfigureGUI/PATHINFO.pm 0444
 lib/Foswiki/Configure/Checkers/ConfigureGUI/SMIME/InstallCert.pm 0444
 lib/Foswiki/Configure/Checkers/Cache/Debug.pm 0444
 lib/Foswiki/Configure/Checkers/Cache/DependencyFilter.pm 0444
+lib/Foswiki/Configure/Checkers/Cache/Implementation.pm 0444
 lib/Foswiki/Configure/Checkers/Cache/RootDir.pm 0444
 lib/Foswiki/Configure/Checkers/Certificate/ClientChecker.pm 0444
 lib/Foswiki/Configure/Checkers/Certificate/ClientServerChecker.pm 0444