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Item10299: DBCachePlugins::WebDB should retry when reading the cache file fails

Priority: Enhancement
Current State: No Action Required
Released In: n/a
Target Release: n/a

Applies To: Extension
Component: DBCachePlugin
Branches:

Reported By: OliverKrueger
Waiting For:
Last Change By: OliverKrueger

Some time ago I made the following patch for DBCachePlugins WebDB.pm cause some DBD archivists had trouble with the cache file.

I forgot about the patch and never used it in a production environment. Maybe somebody else finds it useful.

Index: WebDB.pm
===================================================================
--- WebDB.pm    (Revision 10299)
+++ WebDB.pm    (Arbeitskopie)
@@ -75,8 +75,18 @@
 # WARNING: this breaks on Archivists that are not file-based
 sub _getCacheFile {
   my $this = shift;
+  my $retries = 0;
 
   my $cacheFile = $this->{archivist}->{_file};
+
+  # on some BDB Archivists the above returns undef sometimes
+  my $maxRetries = $Foswiki::cfg{DBCache}{MaxRetries} || 5;
+  while ( (not defined $cacheFile) && ($retries <= $maxRetries) ) {
+    $retries++;
+    sleep(0.5);
+    $cacheFile = $this->{archivist}->{_file};
+  }
+
   writeDebug("cacheFile=$cacheFile");
   return $cacheFile if -f $cacheFile;

-- OliverKrueger - 31 Jan 2011

ItemTemplate edit

Summary	DBCachePlugins::WebDB should retry when reading the cache file fails
ReportedBy	OliverKrueger
Codebase
SVN Range
AppliesTo	Extension
Component	DBCachePlugin
Priority	Enhancement
CurrentState	No Action Required
WaitingFor
Checkins
TargetRelease	n/a
ReleasedIn	n/a