[rules-users] How to design a rule using collect for filtering? Thanks.
Anh Vuong
anhtvuong at yahoo.com
Wed Aug 15 15:18:26 EDT 2007
http://jira.jboss.com/jira/browse/JBRULES-1086 is created.
Edson Tirelli <tirelli at post.com> wrote:
This is a regression bug. InitialFact should not be shadowed. Can you please open a JIRA for that?
Thank you
Edson
2007/8/15, Anh Vuong < anhtvuong at yahoo.com>: Thanks for your help, Edson.
collect works in my simple test now, but not when I integrate with my code. Is there an easy way to debug LHS to see if collect stmt is evaluated? I notice IllegalAccessError
since my app will load a selected list of jars upfront, so my questions are:
1) Can this error break collect?
2) How can I fix this error still using our own classLoader?
Here is the stack trace:
2007 Aug 15, 09:08:13:193 Exception IllegalAccessError
java.lang.IllegalAccessError: class org.drools.reteoo.InitialFactImplShadowProxy cannot access its superclass org.drools.reteoo.Init
ialFactImpl
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at org.drools.rule.MapBackedClassLoader.fastFindClass(MapBackedClassLoader.java:60)
at org.drools.rule.MapBackedClassLoader.loadClass(MapBackedClassLoader.java:79)
at java.lang.ClassLoader.loadClass (Unknown Source)
at org.drools.reteoo.Rete$ObjectTypeConf.loadOrGenerateProxy(Rete.java:379)
at org.drools.reteoo.Rete$ObjectTypeConf.defineShadowProxyData(Rete.java:344)
at org.drools.reteoo.Rete$ObjectTypeConf .<init>(Rete.java:320)
at org.drools.reteoo.Rete.assertObject(Rete.java:145)
at org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:190)
at org.drools.reteoo.ReteooWorkingMemory$WorkingMemoryReteAssertAction.execute(ReteooWorkingMemory.java:163)
at org.drools.common.AbstractWorkingMemory.executeQueuedActions(AbstractWorkingMemory.java:1241)
at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:858)
at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:822)
at org.drools.common.AbstractWorkingMemory.insert (AbstractWorkingMemory.java:623)
Thanks,
-av
Edson Tirelli < tirelli at post.com> wrote:
No single simple answer here. You need to check what would better fit your use case.
The thing is: it is not possible to limit the number of matches to a collect statement... all matching instances WILL match it and be collected.
No really "clean" way I can think about, but a few possible options (haven't executed them, but shall work):
1. Simply execute the actions multiple times in the consequence:
when
eventList : LinkedList( $size : size >= 5 ) from collect( Event(text matches ".*rule5.*" ))
then
for( int i = 0; i < $size/5; i++ )
System.out.println( "rule5 is fired " + eventList.size ());
end
2. Flag used facts:
when
eventList : LinkedList( size >= 5 ) from collect( Event(text matches ".*rule5.*", processed == false ))
then
System.out.println("rule5 is fired " + eventList.size ());
for( int i = 0; i < 5; i++ ) {
Event e = (Event) eventList.get ( i );
e.setProcessed ( true );
update( e );
}
end
2. Retract used facts:
when
eventList : LinkedList( size >= 5 ) from collect( Event(text matches ".*rule5.*" ))
then
System.out.println("rule5 is fired " + eventList.size ());
for( int i = 0; i < 5; i++ ) {
Event e = (Event) eventList.get( i );
retract( e );
}
end
Hope it helps.
Edson
2007/8/10, Anh Vuong < anhtvuong at yahoo.com>: Hi,
I'd like to use keyword collect to do my filtering but its behaviour confused me, please advise. I greatly appreciate your help.
Problem 1:
when
eventList : LinkedList(size == 5)
from collect( Event(text matches
".*rule5.*" ))
then System.out.println(
"rule5 is fired " + eventList.size());
I still do not see any log msg after adding 5+ events. Is something wrong with my rule?
Problem 2:
when
event: Event(text matches ".*rule5.*" ))
eventList : LinkedList(size == 5)
from collect( Event(text == event.text)
then System.out.println(
"rule5 is fired " + eventList.size());
After adding 5 events, I see 5 log msg instead of one as I'd expect.
If I add more events, I will see more log. How do I tell LHS to reset the count from 0.
Basically, I want to take 1 event out of 5 similar events (suppressing filtering). So if there are 10 similar events, my RHS should activate 2 times, not 10 times.
Thanks,
-av
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Edson Tirelli
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Office: +55 11 3529-6000
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Edson Tirelli
Software Engineer - JBoss Rules Core Developer
Office: +55 11 3529-6000
Mobile: +55 11 9287-5646
JBoss, a division of Red Hat @ www.jboss.com _______________________________________________
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