Re: [rules-users] accumulate vs collect

Edson Tirelli wrote: >    Can you show us the stack trace? What version of Drools are you using? I am using Drools.5.0.1. For this accumulate: v945 : Number ( doubleValue  >=  1 ) from accumulate ( p : t_1 (  c_6 >= 20100512 && c_7 == "5" ) , count(p) ) stack trace follows: EXCEPTION ERROR java.lang.ClassCastException: gr.fbi.rulez.t_1 org.drools.rule.Accumulate.accumulate(Accumulate.java:172) org.drools.reteoo.AccumulateNode.modifyTuple(AccumulateNode.java:424) org.drools.reteoo.AccumulateNode.assertObject(AccumulateNode.java:284) org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:42) org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:147) org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:42) org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:147) org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:42) org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:185) org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:146) org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1046) org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1001) org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:788) org.drools.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:216) utils.LoadDynEntities.load(LoadDynEntities.java:102) gr.fbi.rulez.RulesRunner.ignite(RulesRunner.java:74) ...more irrelevant stuff.. -Stathis > >    In Drools 5.1+, collect is just syntax sugar... internally, collect > is implemented using accumulate. > >    Edson > > 2010/11/11  <rouvas(a)di.uoa.gr>: >> Hi List, >> >> I'm trying to count the number of objects I have in the Working Memory >> using accumulate, but I'm having a ClassCastException thrown at me. >> >> Using a variant with collect, everything work OK. >> >> Can someone shed some light on this issue? >> Is it related to https://jira.jboss.org/browse/JBRULES-2202 ? >> >> I'm using Drools.5.0.1 and the fact is a declared one, as follows: >> >> declare t_1 >>  regRowId : String >>  versionId : String >>  c_7 : String >>  c_1 : String >>  c_2 : String >>  c_3 : String >>  c_4 : String >>  c_5 : String >>  c_6 : Double >> end >> >> trying with : >> >> v945 : Number ( doubleValue  >=  1 ) from accumulate ( p : t_1 (  c_6 >= >> 20100511 && c_7 == "5" ) , count(p) ) >> >> I'm getting a ClassCastException:t_1, while using : >> >> v945 : ArrayList ( size  >=  1 ) from collect ( t_1 (  c_6 >= 20100511 >> && >> c_7 == "5" )  ) >> >> works OK. >> >> The reason I'm preferring accumulate over collect, is that I'm not >> really >> interested in constructing an ArrayList of the matched facts (worries >> about memory consumption), all I want is how many of them are there. >> >> The actual rule I'm using (although I don't think it matters) for the >> accumulate variant, is: >> >> rule "r95944.6" >>        dialect "mvel" >>        when >>                gnId : GoodNumbers() >>                 LogicalValue : Trader( gnId.goodNo==goodNo  ) >>                 v945 : Number ( doubleValue  >=  1 ) from accumulate ( p >> : t_1 (  c_6 >>>= 20100511 && c_7 == "5" ) , count(p) ) >>        then >>                RaResultCode rrc = new RaResultCode(); >>                  rrc.setResultRuleId("95944"); >>                  rrc.setResultRuleVersionId("6"); >>                  rrc.setResultColor("R"); >>                  rrc.setResultRuleCode("01"); >>                  rrc.setResultAction("1"); >>                  rrc.setResultGoodNo(gnId.goodNo); >>                insertLogical(rrc); >> end >> >> Thank you for your time. >> >> -Stathis >> >> >> _______________________________________________ >> rules-users mailing list >> rules-users(a)lists.jboss.org >> https://lists.jboss.org/mailman/listinfo/rules-users >> > > > > -- >   Edson Tirelli >   JBoss Drools Core Development >   JBoss by Red Hat @ www.jboss.com >