If I understand the chemistry correctly, the relation mayUse( Drug, Presc ) -> Boolena must be implemented.
Then, the Facts are pairs of MayUse<Drug, Presc>. To see whether it's valid, you insert a Fact IsValid containing just the two. If a rule can match the IsValid to a MayUse, then it's valid and IsValid is retracted. If a low-salience rule matches just IsValid it's not valid. Or you write the complementary rule. -W On Tue, May 18, 2010 at 11:56 AM, djb <dbrownel...@hotmail.com> wrote: > > Hi Drools users, > > I've got a situation where I've got a list of Drug codes which can only be > used for certain prescription codes. > > The traditional method for implementing this is to simply pre-load the > values in a static Hashmap. Then if get() returns null, it is not a valid > combination. O(1), blazingly fast. > > The issue with using Drools for this, is that Drools can match a code to a > code, and mark it as valid, but cannot call it invalid, as another rule may > still be relevant. Therefore, using Drools for this would require marking > combinations as valid, and afterwards, doing a linear traversal of the > prescriptions to see if there are any combinations that are not valid. > > Is this the case? I would like to try implement it in Drools just for the > sake of consistency, but it seems a bit of a hack. > > Thanks, > Daniel > -- > View this message in context: > http://drools-java-rules-engine.46999.n3.nabble.com/Using-Drools-as-a-glorified-Hashmap-tp825851p825851.html > Sent from the Drools - User mailing list archive at Nabble.com. > _______________________________________________ > rules-users mailing list > rules-users@lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > _______________________________________________ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
