2007/8/15, Anh Vuong < anhtvuong@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@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@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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  Software Engineer - JBoss Rules Core Developer
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