Re: [rules-users] Query in stateless knowledge session returns no results

Aha! I missed the line about the dispose. That makes a lot of sense. What I don't understand is why the example 3.37 in the docs would work. If I understand what you're saying, it shouldn't.

Thanks! Hank Sent from my iPhone On Jul 30, 2011, at 8:27 AM, "Wolfgang Laun" <wolfgang.laun(a)gmail.com <mailto:wolfgang.laun@gmail.com>> wrote: > StatelessKnowledgeSession.execute(...) executes the command(s) and > /finally calls dispose()/ on the session. Use a stateful session or a > global (filled with a low-salience rule) or - simply use the > getObjects command. > -W > > On 29 July 2011 22:47, Heijink, Hank <heijink(a)audible.com > <mailto:heijink@audible.com>> wrote: > > Hi all, > > I'm new to Drools, so please excuse me if I'm asking about the > obvious--it's certainly not obvious to me. The problem is this: I > use a stateless knowledge session where a list of facts is > inserted. The rules that fire create new facts, and after all the > rules have fired, I'd like to obtain a list of all the facts (the > old and the new). The best way seemed to use a query. I'm using > Drools 5.1 on Linux. > This is part of my .drl file (without the imports): > > rule "create badge" > when > Event ( eventType == EventType.SOME_EVENT_TYPE ) > not BadgeState ( identifier == "badge" ) > then > insert( new BadgeState("badge") ); > end > > query "all badges" > aBadge : BadgeState() > end > > This is the Java code: > > StatelessKnowledgeSession ksession = > StatsKnowledgeBase.getKnowledgeBase().newStatelessKnowledgeSession(); > > // Create a list of share events > ArrayList<Event> events = new ArrayList<Event>(); > Date now = new Date(); > MobileDevice aDevice = new > MobileDevice("uniqueId", "deviceType"); > for (int i = 0; i < 5; i++) { > Event anEvent = new Event.Builder(now, > aDevice, "aCustomer", EventType.SOME_EVENT_TYPE).build(); > events.add(anEvent); > } > > // Create the query for the badges > List<Command> commands = new ArrayList<Command>(); > > commands.add(CommandFactory.newInsertElements(events)); > commands.add(CommandFactory.newQuery("all badges", > "all badges")); > > // Feed the events into Drools > KnowledgeRuntimeLogger logger = > KnowledgeRuntimeLoggerFactory.newConsoleLogger(ksession); > ExecutionResults results = ksession.execute( > CommandFactory.newBatchExecution(commands) ); > NativeQueryResults queryResults = > (NativeQueryResults)results.getValue("all badges"); > > // At this point, queryResults is empty. > > logger.close(); > > // Get a list of badges > List<BadgeState> badges = new ArrayList<BadgeState>(); > for (Iterator<QueryResultsRow> i = > queryResults.iterator(); i.hasNext(); ) { > QueryResultsRow result = i.next(); > BadgeState obj = > (BadgeState)result.get("aBadge"); > badges.add(obj); > } > > The logger shows me that the BadgeState object is created, but > the query returns an empty list. I've searched the documentation, > which suggests that I'm doing it right > (http://drools.herod.net/drools-expert/html/ch03.html#d0e1956, > example 3.37), the archives of this mailinglist, and the web, so > far without success. > > Clearly, I'm missing something, and I have the nagging feeling > that it's something simple... > > Any help is much appreciated! > > Best, > Hank > > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org <mailto:rules-users@lists.jboss.org> > https://lists.jboss.org/mailman/listinfo/rules-users > > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org <mailto:rules-users@lists.jboss.org> > https://lists.jboss.org/mailman/listinfo/rules-users _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users