Hi, ta very much everyone for the help so far. Another question - how to sort by number of matches please? Say I have objects A, B, C and D and rules 1 to 5. Each object can match each rule independently e.g. A can match rule 1 and 2, B might match all rules 1 to 5, C might match none, D rules 3 and 4 etc. I need to rank them and then print out info about them in order of number of matches, with an indication of which rules matched, i.e. print info on B before A but nothing at all on C, etc. In Java I'd probably do it by having, as a global variable, a map where the key is the name or ID field of the object and the value is an arraylist which gets added to in the consequence (with a string about what kind of match it was i.e. which rule was matched) whenever there's a match on a rule for that object. Then sort it by descending length of the arraylists. There has to be a better and more elegant way of doing it in Drools, probably involving collecting info on the matches and then sorting them, but I can't think what or how. Does anyone have any thoughts or suggestions please? Many thanks in advance. -- View this message in context: http://www.nabble.com/Collecting---sorting-by-the-number-of-matches-tp250... Sent from the drools - user mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

Thank you Dave. I had a look, but it seems I'd still have to track it and process the results in Java rather than using rules, so I guess I'll stick with my original Java solution. Unless there's some way to track it in Drools? Cheers dave sinclair wrote: > > Take a look at the *AgendaEventListener*. It allows you to get callbacks > for > when a rule has fired. This would allow you to keep track of which rules > fire along with the objects that caused it to fire. > -- View this message in context: http://www.nabble.com/Collecting---sorting-by-the-number-of-matches-tp250... Sent from the drools - user mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users