3:12 p.m.
Hi,
I am starting out with RuleFlow this week. I have created a flow that uses
rules I had created in the past. The issue began when I tried to define a
Rule Constraint for a Split. The Fact I am referencing in that Rule
Constraint is defined as an Event fact in my rules file. When I attempt to
insert the fact into WorkingMemory (using ksession.insert(object);), I get
the error below. It appears to me that the fact is being inserted as
"default" fact, but somewhere along the chain it's interpreted as an Event
fact? Is this conflicts in the process' definition of the fact to the rule's
definition? Did I miss some tie-up between the rules and process? Is there
a way in the process to declare a fact as an event? Thanks!
Using Drools 5.0
RULE FILE SNIPPET:
package PostEventProcessor
...
import com.company.TrxQueueIn
...
declare TrxQueueIn
@role( event )
@timestamp( releaseTime )
end
...
RULE FLOW SNIPPET:
<?xml version="1.0" encoding="UTF-8"?>
<process xmlns="http://drools.org/drools-5.0/process"
xmlns:xs="http://www.w3.org/2001/XMLSchema-instance"
xs:schemaLocation="http://drools.org/drools-5.0/process
drools-processes-5.0.xsd"
type="RuleFlow" name="Post Event Processor post event"
id="PEPpostEvent" package-name="PostEventProcessor"
<header <imports <import
name="org.drools.runtime.process.WorkflowProcessInstance" / <import name="com.company.TrxSurvey" / <import name="com.company.TrxQueueIn" / </imports
<variables <variable
name="SurveyComplete" <type
name="org.drools.process.core.datatype.impl.type.BooleanDataType" / <value>false</value </variable
<variable name="MaxAttempts"
<type
name="org.drools.process.core.datatype.impl.type.BooleanDataType" / <value>false</value </variable
<variable name="trxDetail"
<type
name="org.drools.process.core.datatype.impl.type.ObjectDataType"
className="com.sironahealth.database.intelliview.domain.TrxDetail" / </variable
<variable name="SurveyFlow"
<type
name="org.drools.process.core.datatype.impl.type.StringDataType" / </variable
</variables </header
<nodes <start id="1"
name="Start" x="137" y="16" width="80"
height="40" / <ruleSet id="2"
name="Max Attempts" x="137" y="88" width="80"
height="40" ruleFlowGroup="MaxAttempts" /
<ruleSet id="3" name="Reason Actions" x="54"
y="232" width="117"
height="40" ruleFlowGroup="ReasonActions" / <subProcess id="4" name="Next
Survey" x="406" y="585" width="129"
height="40" processId="PEPSurevysBIO"
<mapping type="in" from="trxDetail" to="trxDetail" / </subProcess
<split id="5" name="Survey Completed?" x="211"
y="392" width="141"
height="40" type="2"
<constraints <!-- THIS IS THE
CONSTRAINT THAT GIVES ME PROBLEMS - SECOND LINE OF
RULE -- <constraint toNodeId="10"
toType="DROOLS_DEFAULT" name="Survey
Completed" priority="1" type="rule" dialect="mvel"
>processInstance :
WorkflowProcessInstance()
TrxQueueIn(queueStatus == "CLO", trxDetail ==
(processInstance.getVariable("trxDetail"))) </constraint <constraint toNodeId="6"
toType="DROOLS_DEFAULT" name="Survey Not
Complete" priority="2" type="rule" dialect="mvel"
>eval(true)</constraint </constraints </split
<end id="6" name="End" x="182" y="503"
width="80" height="40" /
<end id="7" name="End" x="430" y="657"
width="80" height="40" /
<end id="8" name="End" x="279" y="238"
width="80" height="40" /
<split id="9" name="Max Attempts?" x="124"
y="160" width="106"
height="40" type="2"
<constraints <constraint
toNodeId="8" toType="DROOLS_DEFAULT" name="Maxed"
priority="1" type="code" dialect="java" >return
MaxAttempts;</constraint <constraint
toNodeId="3" toType="DROOLS_DEFAULT" name="Not Maxed"
priority="1" type="code" dialect="java" >return
!MaxAttempts;</constraint </constraints </split
<actionNode id="10" name="Action" x="430"
y="513" width="80" height="40"
<action type="expression"
dialect="java" >SurveyFlow =
"PEPSurevysBIO";</action
</actionNode <split id="11"
name="Is Survey?" x="73" y="315" width="80"
height="40"
type="2" <constraints <constraint toNodeId="12"
toType="DROOLS_DEFAULT" name="Not a
survey" priority="2" type="rule" dialect="mvel"
>eval(true)</constraint <constraint
toNodeId="5" toType="DROOLS_DEFAULT" name="Surveyed"
priority="1" type="rule" dialect="mvel" >processInstance
:
WorkflowProcessInstance()
TrxSurvey(trxDetail == (processInstance.getVariable("trxDetail"))
)</constraint </constraints </split
<end id="12" name="End" x="18" y="396"
width="80" height="40" /
</nodes
<connections <connection
from="1" to="2" /
<connection from="9" to="3" bendpoints="[113,179]" / <connection from="10" to="4" / <connection from="11" to="5"
bendpoints="[280,335]" / <connection
from="5" to="6" bendpoints="[]" / <connection from="4" to="7" / <connection from="9" to="8"
bendpoints="[317,181]" / <connection
from="2" to="9" /
<connection from="5" to="10" bendpoints="[467,412]" / <connection from="3" to="11" / <connection from="11" to="12"
bendpoints="[59,335]" / </connections
</process
STACK TRACE:
java.lang.ClassCastException: org.drools.common.DefaultFactHandle cannot be
cast to org.drools.common.EventFactHandle
at
org.drools.rule.SlidingTimeWindow.updateNextExpiration(SlidingTimeWindow.java:192)
at
org.drools.rule.SlidingTimeWindow.assertRightTuple(SlidingTimeWindow.java:119)
at
org.drools.rule.BehaviorManager.assertRightTuple(BehaviorManager.java:87)
at org.drools.reteoo.JoinNode.assertObject(JoinNode.java:153)
at
org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:360)
at
org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:344)
at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:147)
at
org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:360)
at
org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:337)
at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:185)
at org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:146)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1046)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1001)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:788)
at
org.drools.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:216)
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9:47 a.m.
I'm not sure if I had stumped everyone, or my previous post a really dumb
thing for me to ask. If it's something where I should have read the manual,
can anyone give me a hint? Thanks!
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11 a.m.
It is definitively possible to use events in process constraints. Your
exception, though, implies that you are using a sliding time window on a
fact type that is not declared as an event. In later versions I improved the
error handling to raise a compile time error when this is detected, but I
guess you are using 5.0.1, where it still throws a runtime exception:
java.lang.ClassCastException: org.drools.common.DefaultFactHandle cannot be
cast to org.drools.common.EventFactHandle at
org.drools.rule.SlidingTimeWindow.updateNextExpiration(SlidingTimeWindow.java:192)
Can you double check your rules to make sure you are not doing that?
Edson
2010/2/10 paulB <paul.borlin(a)sironahealth.com>
I'm not sure if I had stumped everyone, or my previous post a really dumb
thing for me to ask. If it's something where I should have read the
manual,
can anyone give me a hint? Thanks!
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Edson Tirelli
JBoss Drools Core Development
JBoss by Red Hat @ www.jboss.com
11:34 a.m.
Thanks for the reply, Edson.
First off, I have verified the version of Drools I am using to be 5.0.1 .
In my DRL file, the imports are as follows:
import com.company.TrxQueueIn
...
declare TrxQueueIn
@role( event )
@timestamp( releaseTime )
end
...
And in my RF file, the imports are as follows:
<imports>
...
<import name="com.company.TrxQueueIn" />
...
</imports>
My initial thought would be that I would not have to declare an import for
the RF file, since the import and declaration exist on the DRL file. When I
don't put that import in the RF file, then I get the following error:
Unable to resolve ObjectType 'TrxQueueIn' : [Rule
name='RuleFlow-Split-PEPpostEvent-5-10']
java.lang.IllegalArgumentException: Could not parse knowledge.
at RuleFlowTest.readKnowledgeBase(RuleFlowTest.java:167)
...
Additionally, if I remove the DECLARE statement from the DRL file (and
associated event logic) leaving the imports on both files, all works well.
However, my rules need the sliding time window logic to work properly.
Are there additional attributes to the <import> tag the declare the fact
role? I wasn't able to find that.
Thank you for any additional insight,
Paul
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2:47 p.m.
Additional note:
Using 5.1.0.M1 made no changes to the behavior I describe. I get the same
results.
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3:21 p.m.
Hi Paul,
I will need a self contained test to reproduce and debug this. Are you
able to do that and attach it to a JIRA?
Thanks,
Edson
2010/2/15 paulB <paul.borlin(a)sironahealth.com>
Additional note:
Using 5.1.0.M1 made no changes to the behavior I describe. I get the same
results.
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Edson Tirelli
JBoss Drools Core Development
JBoss by Red Hat @ www.jboss.com
8:40 a.m.
Done. JBRULES-2433
Let me know if you have any questions.
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