[infinispan-dev] Delta operations

Hello, I'm going to implement some custom Delta operations, I'd appreciate some explanations on the expectations of the API. I got puzzled about the method org.infinispan.atomic.Operation.rollback(Map<K, V>) it doesn't seem to be ever invoked, but still some Operation implementations collect information to properly handle an eventual rollback request (such as ClearOperation). In case it's not needed, can we remove the method and all unneded logic in each operation? In case it's needed, it looks like the existing operation implementations are not able to honor a rollback invocation after being marshalled & ummarshalled, as most needed information is not externalized; could anybody spend two words on it? thanks, Sanne