On 31/07/2011 17:45, Mark Proctor wrote:
On 31/07/2011 17:25, Heijink, Hank wrote:
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.
It should work, as long as the query is executed as part of the same execute batch. We have unit tests f or that too somewhere.
ok I see the problem. Your rules will not fire until the all the command shave been executed. i.e. the implicit fireAllRules() is once all commands have been executed. Which means the query will be invoked before your rule fires to insert the object.

Instead you need to add the FireAllRules command before executing the query.

Mark

mark

Thanks!
Hank

Sent from my iPhone

On Jul 30, 2011, at 8:27 AM, "Wolfgang Laun" <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@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


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