Fix for http://issues.alfresco.com/jira/browse/ALF-713.

Can't reproduce the bug but spotted a race condition in UserUsageTrackingComponent that may cause this in rare circumstances. Deal with this by throwing a ConcurrencyFailureException and let the txn retry handler retry the operation.

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@19862 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/repo/usage/UsageServiceImpl.java

@@ -49,6 +49,11 @@ public class UsageServiceImpl implements UsageService
         return usageDeltaDAO.getTotalDeltaSize(usageNodeRef);
     }
     
+    public long getAndRemoveTotalDeltaSize(NodeRef usageNodeRef)
+    {
+        return usageDeltaDAO.getAndRemoveTotalDeltaSize(usageNodeRef);
+    }
+    
     public Set<NodeRef> getUsageDeltaNodes()
     {
         return usageDeltaDAO.getUsageDeltaNodes();