retries for 4store errors during sparql updates

1 files changed, 12 insertions, 3 deletions

diff --git a/lib/4store.rb b/lib/4store.rb
index d03a38e..4240879 100644
--- a/lib/4store.rb
+++ b/lib/4store.rb
@@ -44,9 +44,18 @@ module OpenTox
       end
 
       def self.update sparql
-        RestClient.post(update_uri, :update => sparql )
-      rescue
-        bad_request_error $!.message, update_uri
+        attempts = 0
+        begin
+          attempts += 1
+          RestClient.post(update_uri, :update => sparql )
+        rescue
+          if attempts < 4 # 4store may return errors under heavy load
+            sleep 1
+            retry
+          else
+            bad_request_error $!.message, update_uri
+          end
+        end
       end
 
       def self.query sparql, mime_type