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/domain/UsageDeltaDAO.java

@@ -43,6 +43,14 @@ public interface UsageDeltaDAO
      */
     public long getTotalDeltaSize(NodeRef usageNodeRef);
     
+    /**
+     * Get the total delta size for a node and remove any deltas used in the calculation.
+     * 
+     * @param nodeRef       the node reference
+     * @return              sum of delta sizes (in bytes) - can be +ve or -ve
+     */
+    public long getAndRemoveTotalDeltaSize(NodeRef usageNodeRef);
+
     public Set<NodeRef> getUsageDeltaNodes();
     
     public int deleteDeltas(NodeRef nodeRef);