3:47 p.m.
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
7:26 a.m.
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> 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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rules-users(a)lists.jboss.org
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11:25 a.m.
New subject: 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@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
<<mailto:heijink@audible.com>heijink@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>http://dr...,
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
<mailto:rules-users@lists.jboss.org>rules-users@lists.jboss.org<mailto:rules-users@lists.jboss.org>
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https://lists.jboss.org/mailman/listinfo/rules-users
11:45 a.m.
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.
mark
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
_______________________________________________
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11:47 a.m.
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(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
_______________________________________________
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12:07 p.m.
Thanks so much! I'll have a chance to test it tomorrow.
Hank
Sent from my iPhone
On Jul 31, 2011, at 12:48 PM, "Mark Proctor"
<mproctor@codehaus.org<mailto:mproctor@codehaus.org>> wrote:
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"
<<mailto:wolfgang.laun@gmail.com>wolfgang.laun@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
<<mailto:heijink@audible.com>heijink@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>http://dr...,
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
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8:49 a.m.
New subject: Query in stateless knowledge session - SOLVED
Mark,
Thanks for your help! I was finally able to test, and that totally worked. I was confused
by example 3.37 (4.37 in the Drools 5.2.0 docs). The key point I missed must be that
newStartProcess causes all the rules to fire. Well, at least I was right about it being
something simple. :-)
Best,
Hank
On Jul 31, 2011, at 12:47 PM, Mark Proctor wrote:
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(a)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> 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.
>>>
>>> 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
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6 comments
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participants (3)
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Heijink, Hank -
Mark Proctor -
Wolfgang Laun