[rules-users] Rule does not work without another rule testing eval(true)

Wolfgang Laun wolfgang.laun at gmail.com
Fri Mar 30 08:03:49 EDT 2012 

You start your process and it rips quickly through all rule flows.
Then you insert a fact, which would trigger something in the rule flow
group - but this one's history.

In the second scenario, the additional rule creates an activation
without requiring an facts, and this activation works just like a
sluice gate, barring progress, so that your insertions can throw some
facts into the eddying waters...

I hope this wasn't too poetic ;-)

-W



On 30/03/2012, David Bennison <David.Bennison at cdl.co.uk> wrote:
> Hi,
>
>
>
> I have a simple rule (for a JUnit test) in a  single ruleflow group, as
> configured in the BPNM:-
>
>
>
> <process processType="Private" isExecutable="true" id="liveDateStart"
> name="liveDateStart"
> tns:packageName="co.uk.cdl.vis.miami.rules.miamicontext" >
>
>
>
>     <!-- nodes -->
>
>     <startEvent id="_1" name="StartProcess" />
>
>     <businessRuleTask id="_3" name="goLiveDateCheck"
> g:ruleFlowGroup="goLiveDateCheck" >
>
>     </businessRuleTask>
>
>     <endEvent id="_4" name="EndProcess" >
>
>         <terminateEventDefinition/>
>
>     </endEvent>
>
>
>
>     <!-- connections -->
>
>     <sequenceFlow id="_1-_3" sourceRef="_1" targetRef="_3" />
>
>     <sequenceFlow id="_3-_4" sourceRef="_3" targetRef="_4" />
>
>
>
>   </process>
>
>
>
>
>
> When I run the rule it appears to enter the LHS but never RHS (unless I
> replace the LHS with eval(true)), even though the MiamiContext Fact is
> present and correct.
>
> However, if I add another rule in the rule file that simply contains
> eval(true) in the LHS (and debug in the RHS), then my original rule
> fires correctly.
>
> This can't be correct but I cannot find a way to get it to work without
> the second rule.
>
>
>
> Rules configured in other .drl files and ruleflows are working correctly
> (using the same Java code etc), so there must be something particular to
> this rule that is wrong ... but I can't see what!
>
>
>
> Any help would be much appreciated.
>
>
>
> I am using Drools 5.3.0
>
>
>
>
>
> package uk.co.cdl.vis.miami.rules.miamicontext;
>
>
>
> import uk.co.cdl.vis.miami.rules.RulesLogger;
>
> import uk.co.cdl.vis.miami.model.MiamiContext;
>
> import org.joda.time.DateTime;
>
>
>
>
>
> dialect "mvel"
>
>
>
>
>
> ## Go-Live Date
>
> ########################################################################
> #################
>
>
>
>
>
>
>
> rule "Increment GoLiveDate"
>
>
>
>     ruleflow-group "goLiveDateCheck"
>
>     when
>
>         $miamiContext : MiamiContext($date : goLiveDate )
>
>     then
>
>         RulesLogger.LOG.debug("*********** BEFORE:" +
> $miamiContext.goLiveDate);
>
>
>
>               $miamiContext.goLiveDate = $date.plusDays(1);
>
>
>
>               RulesLogger.LOG.debug("***********  AFTER:" +
> $miamiContext.goLiveDate);
>
>
>
> end
>
>
>
> ## Without this rule the above rule does not work
>
> rule "goLiveDateTEST"
>
>
>
>     ruleflow-group "goLiveDateCheck"
>
>     when
>
>         eval(true)
>
>     then
>
>         RulesLogger.LOG.debug("*********** goLiveDateTEST ***********");
>
> end
>
>
>
>
>
> The knowledge engine is run as follows and the startProcess is
> "liveDateStart":-
>
>
>
> public Collection<Object> executeRules(Collection<Object> facts) throws
> Exception {
>
>
>
>         KnowledgeBuilder kbuilder =
> KnowledgeBuilderFactory.newKnowledgeBuilder();
>
>         kbuilder.add(ResourceFactory.newClassPathResource(changeSet),
> ResourceType.CHANGE_SET);
>
>
>
>         KnowledgeBase kbase = kbuilder.newKnowledgeBase();
>
>         StatefulKnowledgeSession ksession =
> kbase.newStatefulKnowledgeSession();
>
>
>
>         new Slf4jWorkingMemoryLogger(ksession);
>
>
>
>         if (StringUtils.isNotBlank(startProcess)) {
>
>             ksession.startProcess(startProcess);
>
>         }
>
>
>
>         for (Object fact : facts) {
>
>             ksession.insert(fact);
>
>         }
>
>
>
>         ksession.fireAllRules(MAX_RULE_FIRES);
>
>
>
>         Collection<Object> resultFacts = ksession.getObjects();
>
>
>
>         ksession.dispose();
>
>
>
>         return resultFacts;
>
>     }
>
>
>
>
>
> Log without 2nd rule :-
>
>
>
> 2012-03-30 12:17:03,567 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) BEFORE RULEFLOW STARTED
> process:liveDateStart[id=liveDateStart]
>
> 2012-03-30 12:17:03,576 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) BEFORE PROCESS NODE TRIGGERED
> node:StartProcess[id=1] process:liveDateStart[id=liveDateStart]
>
> 2012-03-30 12:17:03,576 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) BEFORE PROCESS NODE EXITED
> node:StartProcess[id=1] process:liveDateStart[id=liveDateStart]
>
> 2012-03-30 12:17:03,577 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) BEFORE PROCESS NODE TRIGGERED
> node:goLiveDateCheck[id=3] process:liveDateStart[id=liveDateStart]
>
> 2012-03-30 12:17:03,580 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) BEFORE RULEFLOW GROUP ACTIVATED
> group:goLiveDateCheck[size=0]
>
> 2012-03-30 12:17:03,580 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) AFTER RULEFLOW GROUP ACTIVATED
> group:goLiveDateCheck[size=0]
>
> 2012-03-30 12:17:03,580 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) AFTER PROCESS NODE TRIGGERED
> node:goLiveDateCheck[id=3] process:liveDateStart[id=liveDateStart]
>
> 2012-03-30 12:17:03,580 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) AFTER PROCESS NODE TRIGGERED
> node:StartProcess[id=1] process:liveDateStart[id=liveDateStart]
>
> 2012-03-30 12:17:03,581 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) AFTER PROCESS NODE TRIGGERED
> node:StartProcess[id=1] process:liveDateStart[id=liveDateStart]
>
> 2012-03-30 12:17:03,581 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) AFTER RULEFLOW STARTED
> process:liveDateStart[id=liveDateStart]
>
> 2012-03-30 12:17:03,583 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) BEFORE RULEFLOW GROUP DEACTIVATED
> group:goLiveDateCheck[size=0]
>
> 2012-03-30 12:17:03,584 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) AFTER RULEFLOW GROUP DEACTIVATED
> group:goLiveDateCheck[size=0]
>
> 2012-03-30 12:17:03,584 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) BEFORE PROCESS NODE EXITED
> node:goLiveDateCheck[id=3] process:liveDateStart[id=liveDateStart]
>
> 2012-03-30 12:17:03,584 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) BEFORE PROCESS NODE TRIGGERED
> node:EndProcess[id=4] process:liveDateStart[id=liveDateStart]
>
> 2012-03-30 12:17:03,585 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) BEFORE PROCESS NODE EXITED
> node:EndProcess[id=4] process:liveDateStart[id=liveDateStart]
>
> 2012-03-30 12:17:03,585 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) BEFORE RULEFLOW COMPLETED
> process:liveDateStart[id=liveDateStart]
>
> 2012-03-30 12:17:03,585 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) AFTER RULEFLOW COMPLETED
> process:liveDateStart[id=liveDateStart]
>
> 2012-03-30 12:17:03,586 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) AFTER PROCESS NODE TRIGGERED
> node:EndProcess[id=4] process:liveDateStart[id=liveDateStart]
>
> 2012-03-30 12:17:03,586 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) AFTER PROCESS NODE TRIGGERED
> node:EndProcess[id=4] process:liveDateStart[id=liveDateStart]
>
> 2012-03-30 12:17:03,586 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) AFTER PROCESS NODE TRIGGERED
> node:goLiveDateCheck[id=3] process:liveDateStart[id=liveDateStart]
>
> 2012-03-30 12:17:03,601 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) ACTIVATION CREATED rule:Increment
> GoLiveDate activationId:Increment GoLiveDate [1] declarations:
> $date=2012-03-02T10:21:05.000Z(1);
> $miamiContext=MiamiContext[goLiveDate=2012-03-02T10:21:05.000Z](1)
> ruleflow-group: goLiveDateCheck
>
> 2012-03-30 12:17:03,602 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) OBJECT ASSERTED
> value:MiamiContext[goLiveDate=2012-03-02T10:21:05.000Z] factId: 1
>
>
>
>
>
> Log with 2nd rule:-
>
>
>
> 2012-03-30 11:59:16,657 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) ACTIVATION CREATED
> rule:goLiveDateTEST activationId:goLiveDateTEST [0] declarations:
> ruleflow-group: goLiveDateCheck
>
> 2012-03-30 11:59:16,670 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) BEFORE RULEFLOW STARTED
> process:liveDateStart[id=liveDateStart]
>
> 2012-03-30 11:59:16,677 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) BEFORE PROCESS NODE TRIGGERED
> node:StartProcess[id=1] process:liveDateStart[id=liveDateStart]
>
> 2012-03-30 11:59:16,678 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) BEFORE PROCESS NODE EXITED
> node:StartProcess[id=1] process:liveDateStart[id=liveDateStart]
>
> 2012-03-30 11:59:16,679 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) BEFORE PROCESS NODE TRIGGERED
> node:goLiveDateCheck[id=3] process:liveDateStart[id=liveDateStart]
>
> 2012-03-30 11:59:16,680 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) BEFORE RULEFLOW GROUP ACTIVATED
> group:goLiveDateCheck[size=1]
>
> 2012-03-30 11:59:16,681 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) AFTER RULEFLOW GROUP ACTIVATED
> group:goLiveDateCheck[size=1]
>
> 2012-03-30 11:59:16,681 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) AFTER PROCESS NODE TRIGGERED
> node:goLiveDateCheck[id=3] process:liveDateStart[id=liveDateStart]
>
> 2012-03-30 11:59:16,681 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) AFTER PROCESS NODE TRIGGERED
> node:StartProcess[id=1] process:liveDateStart[id=liveDateStart]
>
> 2012-03-30 11:59:16,681 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) AFTER PROCESS NODE TRIGGERED
> node:StartProcess[id=1] process:liveDateStart[id=liveDateStart]
>
> 2012-03-30 11:59:16,681 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) AFTER RULEFLOW STARTED
> process:liveDateStart[id=liveDateStart]
>
> 2012-03-30 11:59:16,699 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) ACTIVATION CREATED rule:Increment
> GoLiveDate activationId:Increment GoLiveDate [1] declarations:
> $date=2012-03-02T10:21:05.000Z(1);
> $miamiContext=MiamiContext[goLiveDate=2012-03-02T10:21:05.000Z](1)
> ruleflow-group: goLiveDateCheck
>
> 2012-03-30 11:59:16,700 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) OBJECT ASSERTED
> value:MiamiContext[goLiveDate=2012-03-02T10:21:05.000Z] factId: 1
>
> 2012-03-30 11:59:16,701 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) BEFORE ACTIVATION FIRED
> rule:Increment GoLiveDate activationId:Increment GoLiveDate [1]
> declarations: $date=2012-03-02T10:21:05.000Z(1);
> $miamiContext=MiamiContext[goLiveDate=2012-03-02T10:21:05.000Z](1)
> ruleflow-group: goLiveDateCheck
>
> 2012-03-30 11:59:16,707 DEBUG [main]
> sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ***********
> BEFORE:2012-03-02T10:21:05.000Z
>
> 2012-03-30 11:59:16,709 DEBUG [main]
> sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ***********
> AFTER:2012-03-03T10:21:05.000Z
>
> 2012-03-30 11:59:16,710 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) AFTER ACTIVATION FIRED
> rule:Increment GoLiveDate activationId:Increment GoLiveDate [1]
> declarations: $date=2012-03-03T10:21:05.000Z(1);
> $miamiContext=MiamiContext[goLiveDate=2012-03-03T10:21:05.000Z](1)
> ruleflow-group: goLiveDateCheck
>
> 2012-03-30 11:59:16,710 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) BEFORE ACTIVATION FIRED
> rule:goLiveDateTEST activationId:goLiveDateTEST [0] declarations:
> ruleflow-group: goLiveDateCheck
>
> 2012-03-30 11:59:16,710 DEBUG [main]
> sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ***********
> goLiveDateTEST ***********
>
> 2012-03-30 11:59:16,711 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) AFTER ACTIVATION FIRED
> rule:goLiveDateTEST activationId:goLiveDateTEST [0] declarations:
> ruleflow-group: goLiveDateCheck
>
> 2012-03-30 11:59:16,711 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) BEFORE RULEFLOW GROUP DEACTIVATED
> group:goLiveDateCheck[size=0]
>
> 2012-03-30 11:59:16,712 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) AFTER RULEFLOW GROUP DEACTIVATED
> group:goLiveDateCheck[size=0]
>
> 2012-03-30 11:59:16,714 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) BEFORE PROCESS NODE EXITED
> node:goLiveDateCheck[id=3] process:liveDateStart[id=liveDateStart]
>
> 2012-03-30 11:59:16,714 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) BEFORE PROCESS NODE TRIGGERED
> node:EndProcess[id=4] process:liveDateStart[id=liveDateStart]
>
> 2012-03-30 11:59:16,714 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) BEFORE PROCESS NODE EXITED
> node:EndProcess[id=4] process:liveDateStart[id=liveDateStart]
>
> 2012-03-30 11:59:16,715 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) BEFORE RULEFLOW COMPLETED
> process:liveDateStart[id=liveDateStart]
>
> 2012-03-30 11:59:16,715 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) AFTER RULEFLOW COMPLETED
> process:liveDateStart[id=liveDateStart]
>
> 2012-03-30 11:59:16,715 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) AFTER PROCESS NODE TRIGGERED
> node:EndProcess[id=4] process:liveDateStart[id=liveDateStart]
>
> 2012-03-30 11:59:16,716 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) AFTER PROCESS NODE TRIGGERED
> node:EndProcess[id=4] process:liveDateStart[id=liveDateStart]
>
> 2012-03-30 11:59:16,716 DEBUG [main]
> uk.co.cdl.vis.miami.engine.rules.Slf4jWorkingMemoryLogger.logEventCreate
> d(Slf4jWorkingMemoryLogger.java:23) AFTER PROCESS NODE TRIGGERED
> node:goLiveDateCheck[id=3] process:liveDateStart[id=liveDateStart]
>
>
>
>
>
> </PRE>
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> <PRE>
>

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