[rules-users] Dynamic facts

Hello everyone, I need some enlightening about Drools "dynamic facts" (a term used in the documentation, for facts that could be updated from outside the rule engine). The current documentation always list the "insert" method of a StatefulKnowledgeSession being able to take an additional boolean argument, stating that the corresponding fact supports the PropertyChangeSupport related methods. However, it seems that this method do not exists anymore for already some time now... After googling for a while it appears that some possible workaround were modifyInsert (apparently removed from the API as well) and the @propertyChangeSupport meta-data annotation, but I didn't manage to make it work (actually I wasn't able to find any reference from it in the API, so I guess that it is also not available anymore). So, this left us with the "session.update" method. Which seems to works great, except that it will invalidate the whole fact into the working memory, even if only some of the fields were changed. Is this some current limitation of Drools? Does it have something to do with those "Shadows Fact"? (that would be somehow immutable?) If we effectively can't fire update targeted to some specific fields, this has probably some big implications on performances (even for simple fact with only a few fields). It would also means that one should always aim at the finest granularity for better performances, by somehow "flattening" the object structure into the knowledge base (which in turn could make complicated to reuse those same Pojo in other frameworks, such as hibernate). Did I miss something? Any feedback deeply appreciated, Thanks! M. H.