--- loncom/interface/Attic/lonspreadsheet.pm	2001/03/12 18:27:46	1.43
+++ loncom/interface/Attic/lonspreadsheet.pm	2001/03/13 15:50:47	1.44
@@ -4,7 +4,7 @@
 # 11/11,11/15,11/27,12/04,12/05,12/06,12/07,
 # 12/08,12/09,12/11,12/12,12/15,12/16,12/18,12/19,12/30,
 # 01/01/01,02/01,03/01,19/01,20/01,22/01,
-# 03/05,03/08,03/10,03/12 Gerd Kortemeyer
+# 03/05,03/08,03/10,03/12,03/13 Gerd Kortemeyer
 
 package Apache::lonspreadsheet;
             
@@ -18,6 +18,12 @@ use GDBM_File;
 use HTML::TokeParser;
 
 #
+# Caches for previously calculated spreadsheets
+#
+
+my %oldsheets;
+
+#
 # Cache for stores of an individual user
 #
 
@@ -1482,14 +1488,94 @@ sub loadrows {
 #
 
 sub exportsheet {
- 
-    my ($uname,$udom,$stype,$usymb,$fn)=@_;
+ my ($uname,$udom,$stype,$usymb,$fn)=@_;
+ my @exportarr=();
+#
+# Check if cached
+#
+ my $key=$uname.':'.$udom.':'.$stype.':'.$usymb;
+ my $found='';
+
+ if ($oldsheets{$key}) {
+     map {
+         my ($name,$value)=split(/\_\_\_\=\_\_\_/,$_);
+         if ($name eq $fn) {
+	     $found=$value;
+         }
+     } split(/\_\_\_\&\_\_\_/,$oldsheets{$key});
+ }
+
+ if ($found) {
+#
+# Return what was cached
+#
+     @exportarr=split(/\_\_\_\;\_\_\_/,$found);
+
+ } else {
+#
+# Not cached
+# 
     my $thissheet=&makenewsheet($uname,$udom,$stype,$usymb);
     &readsheet($thissheet,$fn);
     &updatesheet($thissheet);
     &loadrows($thissheet);
-    &calcsheet($thissheet);
-    return &exportdata($thissheet);
+    &calcsheet($thissheet); 
+    @exportarr=&exportdata($thissheet);
+#
+# Store now
+#
+    my $cid=$ENV{'request.course.id'}; 
+    my $current=&Apache::lonnet::reply('get:'.
+                                     $ENV{'course.'.$cid.'.domain'}.':'.
+                                     $ENV{'course.'.$cid.'.num'}.
+				     ':nohist_calculatedsheets:'.
+                                     &Apache::lonnet::escape($key),
+                                     $ENV{'course.'.$cid.'.home'});
+    my %currentlystored=();
+    unless ($current=~/^error\:/) {
+       map {
+           my ($name,$value)=split(/\_\_\_\=\_\_\_/,$_);
+           $currentlystored{$name}=$value;
+       } split(/\_\_\_\&\_\_\_/,&Apache::lonnet::unescape($current));
+    }
+    $currentlystored{$fn}=join('___;___',@exportarr);
+
+    my $newstore='';
+    map {
+        if ($newstore) { $newstore.='___&___'; }
+        $newstore.=$_.'___=___'.$currentlystored{$_};
+    } keys %currentlystored;
+    &Apache::lonnet::reply('put:'.
+                         $ENV{'course.'.$cid.'.domain'}.':'.
+                         $ENV{'course.'.$cid.'.num'}.
+			 ':nohist_calculatedsheets:'.
+                         &Apache::lonnet::escape($key).'='.
+			 &Apache::lonnet::escape($newstore),
+                         $ENV{'course.'.$cid.'.home'});
+ }
+ return @exportarr;
+}
+
+# ===================================================== Calculated sheets cache
+#
+# Load all previously cached spreadsheets for this course
+#
+
+sub cachedsheets {
+    my $cid=$ENV{'request.course.id'};
+    my $reply=&Apache::lonnet::reply('dump:'.
+				     $ENV{'course.'.$cid.'.domain'}.':'.
+                                     $ENV{'course.'.$cid.'.num'}.
+				     ':nohist_calculatedsheets',
+                                     $ENV{'course.'.$cid.'.home'});
+    undef %oldsheets;
+    unless ($reply=~/^error\:/) {
+	map {
+            my ($name,$value)=split(/\=/,$_);
+            $oldsheets{&Apache::lonnet::unescape($name)}
+                      =&Apache::lonnet::unescape($value);
+        } split(/\&/,$reply);
+    }
 }
 
 # ================================================================ Main handler
@@ -1660,10 +1746,13 @@ ENDSCRIPT
 
     $r->print(&hiddenfield('ufn',&getfilename($asheet)));
 
+# ----------------------------------------------------------- Get cached sheets
+
+    &cachedsheets();
 
 # ----------------------------------------------------- Update sheet, load rows
 
-    $r->print("Loaded sheet, updating rows ...<br>\n");
+    $r->print("Loaded sheet(s), updating rows ...<br>\n");
     $r->rflush();
 
     &updatesheet($asheet);
@@ -1695,19 +1784,3 @@ ENDSCRIPT
 
 1;
 __END__
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