--- loncom/lonnet/perl/lonnet.pm	2004/09/17 02:41:21	1.523.2.4
+++ loncom/lonnet/perl/lonnet.pm	2004/09/20 20:14:14	1.523.2.5
@@ -1,7 +1,7 @@
 # The LearningOnline Network
 # TCP networking package
 #
-# $Id: lonnet.pm,v 1.523.2.4 2004/09/17 02:41:21 albertel Exp $
+# $Id: lonnet.pm,v 1.523.2.5 2004/09/20 20:14:14 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -826,6 +826,7 @@ my $disk_caching_disabled=1;
 sub devalidate_cache {
     my ($cache,$id,$name) = @_;
     delete $$cache{$id.'.time'};
+    delete $$cache{$id.'.file'};
     delete $$cache{$id};
     if (1 || $disk_caching_disabled) { return; }
     my $filename=$perlvar{'lonDaemons'}.'/tmp/lonnet_internal_cache_'.$name.".db";
@@ -864,9 +865,25 @@ sub is_cached {
 	return (undef,undef);
     } else {
 	if (time-($$cache{$id.'.time'})>$time) {
-#	    &logthis("Devalidating $id - ".time-($$cache{$id.'.time'}));
-	    &devalidate_cache($cache,$id,$name);
-	    return (undef,undef);
+	    if (exists($$cache{$id.'.file'})) {
+		foreach my $filename (@{ $$cache{$id.'.file'} }) {
+		    my $mtime=(stat($filename))[9];
+		    #+1 is to take care of edge effects
+		    if ($mtime && (($mtime+1) < ($$cache{$id.'.time'}))) {
+#			&logthis("Upping $mtime - ".$$cache{$id.'.time'}.
+#				 "$id because of $filename");
+		    } else {
+			&logthis("Devalidating $filename $id - ".(time-($$cache{$id.'.time'})));
+			&devalidate_cache($cache,$id,$name);
+			return (undef,undef);
+		    }
+		}
+		$$cache{$id.'.time'}=time;
+	    } else {
+#		&logthis("Devalidating $id - ".time-($$cache{$id.'.time'}));
+		&devalidate_cache($cache,$id,$name);
+		return (undef,undef);
+	    }
 	}
     }
     return ($$cache{$id},1);
@@ -910,6 +927,9 @@ sub save_cache {
 		eval <<'EVALBLOCK';
 		$hash{$id.'.time'}=$$cache{$id.'.time'};
 		$hash{$id}=freeze({'item'=>$$cache{$id}});
+		if (exists($$cache{$id.'.file'})) {
+		    $hash{$id.'.file'}=freeze({'item'=>$$cache{$id.'.file'}});
+		}
 EVALBLOCK
                 if ($@) {
 		    &logthis("<font color='red'>save_cache blew up :$@:$name</font>");
@@ -960,8 +980,14 @@ sub load_cache_item {
 	    } else {
 		if (($$cache{$id.'.time'}+$time) < time) {
 		    $$cache{$id.'.time'}=$hash{$id.'.time'};
-		    my $hashref=thaw($hash{$id});
-		    $$cache{$id}=$hashref->{'item'};
+		    {
+			my $hashref=thaw($hash{$id});
+			$$cache{$id}=$hashref->{'item'};
+		    }
+		    if (exists($hash{$id.'.file'})) {
+			my $hashref=thaw($hash{$id.'.file'});
+			$$cache{$id.'.file'}=$hashref->{'item'};
+		    }
 		}
 	    }
 EVALBLOCK
@@ -4227,7 +4253,9 @@ sub metadata {
         unless ($filename=~/\.meta$/) { $filename.='.meta'; }
 	my $metastring;
 	if ($uri !~ m|^uploaded/|) {
-	    $metastring=&getfile(&filelocation('',&clutter($filename)));
+	    my $file=&filelocation('',&clutter($filename));
+	    push(@{$metacache{$uri.'.file'}},$file);
+	    $metastring=&getfile($file);
 	}
         my $parser=HTML::LCParser->new(\$metastring);
         my $token;