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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