Rule engine comparison/due diligence
by Stephen Kestle
Has anybody tried to evaluate the different rules engines in the
interests of using it in their companies' technology stack? I've got to
do some due diligence, so need to evaluate the others.
Specifically, we're looking at a dynamic data model (not OO), and so
that needs to be supported in some way (which I am heavily evaluating
for drools :)). There are plenty of other criteria, but the show
stoppers are:
* unable to support a dynamic data model (being able to type
different structures with the same object base, and to a lesser
degree being able to compose those types into other dynamic types)
* Lack of support (either community or commercial)
* Lack of rule management (activation and expiry dates for rules)
Also high on the list are:
* DSL support
* rule composition and reuse (I don't really know much about how
this this concept plays out with rules yet)
* Testing: the person creating the rules can write the tests, in the
same designer
* Auditing and understanding how the engine got to the state it's in
So far I've found about 15-20 engines. Hopefully most of them will fall
out of the early criteria :)
Cheers
Stephen
18 years
Rule compilation error
by Ravi Krishnamurthy
Hello:
I had generated the decisiontable using the eclipse plugin for drools
4.x. using the eclipse the DecisionsampleTest works fine but on running
it from the command line gets the following error:
/C:\FirstDroolPrj\bin>java com.sample.DecisionTableTest
org.drools.rule.InvalidRulePackage: Rule Compilation error : [Rule
name=HelloWor
ld_11, agendaGroup=MAIN, salience=0, no-loop=false]
com/sample/Rule_HelloWorld_11_0.java (8:411) : The method
update(Decisio
nTableTest.Message) is undefined for the type Rule_HelloWorld_11_0
com/sample/Rule_HelloWorld_11_0.java (9:453) : The method
update(Decisio
nTableTest.Message) is undefined for the type Rule_HelloWorld_11_0
at org.drools.rule.Package.checkValidity(Package.java:419)
at
org.drools.common.AbstractRuleBase.addPackage(AbstractRuleBase.java:2
92)
at
com.sample.DecisionTableTest.readDecisionTable(DecisionTableTest.java
:62)
at com.sample.DecisionTableTest.main(DecisionTableTest.java:35)
/
Have attached the .xsl and the DecisionTableTest for the reference.
Thanks for your help and time,
Regards,
Ravi
18 years
stateless & statefulls sessions
by Vinoth Kumar Somasundaram
Hi All,
It would be of great help if someone shares their knowledge on Stateless
and Stateful session with some examples.
Any document on the topic would be of great help. I have been wandering
around in search of a material.
thanks and regards,
vinoth s
________________________________
18 years, 1 month
TypeDeclaration - POJO or TEMPLATE?
by Stephen Kestle
I'm creating a type hierarchy using TypeDeclarations based on an
ontological model (analagous to an xml schema for the purposes of this
post).
If I declare a drl file to have the following declarations
declare Address
line1 : String
line2 : String
end
declare Person
name : String
age : int
address : Address
end
it will create Java Pojo classes for me. However, I had it all working
using fact templates, except for the address item. Is it possible to
insert fact implementations based on templates, while declaring
TypeDeclarations in the drl? (I now go to look for how to specify the
format = TEMPLATE for the drl)
I say this because I'm looking up values using id strings - e.g. the
exact same way that FactTemplate based Facts does accessing. I don't
want to have to convert all my String ids to reflectively call the set
methods on the created Pojo.
Hopefully this is enough info for you 5.0 developers - I'm still trying
to wrap my head around it all.
Cheers
Stephen
18 years, 1 month
Can someone explain what RulebaseConfiguration.setRemoveIdentities(true) does?
by Brett M. Bergquist
In the manual, there is an example when setting up to use identity
assert behavior:
RuleBaseConfiguration conf = new RuleBaseConfiguration();
conf.setAssertBehaviour( AssertBehaviour.IDENTITY );
conf.setRemoveIdentities( true );
RuleBase ruleBase = RuleBaseFactory.newRuleBase( conf );
I need to use AssertBehavior.EQUALITY in one of my RuleBase and I don't
know if I need to call "conf.setRemoveIdentities" or not. The API
documentation is very sparse on what this method does.
Thanks in advance.
Brett
18 years, 1 month
Deploy a new version to BRMS without the web gui
by Martin Rebenstorff
Hello,
I plan to store my rules in BRMS. My rules will frequently change. In addition the rules are to be created/modified dynamically. But I need the possibility of updating my changed rules dynamically in the BRMS via a JAVA interface. The update process may not triggered via the web gui of the BRMS. Is this possible?
Thanks
Martin
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Homepage mit eigenem Namen. Jetzt starten! http://unddu.de/?kid=kid@mf2
18 years, 1 month
Rule exception
by Delaunay Gaetan
Hi all,
I've got problem with the following rule
rule 'Satellite mediation'
when
PricingField(name=="srv", eval(strValue.contains("VOIX")))
$field : PricingField( name == "duree")
then
mediationManager.addLine(11,$field.getIntValue());
end
I've got this exception when this rule is use
java.lang.AbstractMethodError:
Mediation.Rule_Satellite_mediation_0ReturnValue0Invoker.evaluate(Ljava/lang/Object;Lorg/drools/spi/Tuple;[Lorg/drools/rule/Declaration;[Lorg/drools/rule/Declaration;Lorg/drools/WorkingMemory;)Z
at
org.drools.rule.PredicateConstraint.isAllowed(PredicateConstraint.java:210)
at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:132)
at
org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:317)
at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:140)
at
org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:298)
at
org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:153)
at org.drools.reteoo.Rete.assertObject(Rete.java:177)
at
org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:192)
at
org.drools.reteoo.ReteooWorkingMemory.doInsert(ReteooWorkingMemory.java:71)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:886)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:858)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:659)
What's wrong?
18 years, 1 month
DROOLS with BRMS in J2EE Environment
by psentosa
Hi,
sorry for double posting now, I'm afraid my first post which I added to an
existing thread with similar topic, hasn't been looked at because of the
length of the thread :-) so, please apologize
The following problem:
I have some service implementation in my J2EE-based webapp for
calculating/processing inputs from user (I'll call these
calculating/processing service).
I try to integrate drools to do some checking on user input, before it is
saved into the DB and to generate some reports based on already saved data
respectively. The Rule Engine should just gives some feedback about the
rules being violated.
For the integration purpose, I'd like to implement several additional
services for the rule-checking purpose (I'll call this checking-service),
each of which uses RuleAgent to create RuleBase from BRMS. The reason why I
need several services is because I separate my rules in different packages,
depending on which calculating/processing service to use the checking
service, so I don't think all rules should always be included in the RETE
tree.
1st question here: is this the right strategy to separate the rule-checking
into some parts?
Now, for the checking itself, I use drools StatelessSession instance (The
(checking)service class for this is also a stateless session bean). Every
time calculation/processing service is called from the UI, it calls the
checking service, the checking service will do its parts with the Rule
Engine, gets the result, and pass it back to the calculating/processing
service.
2nd question: could such nested calls of services affect the performance of
the webapp (especially bcs it has to make additional call to BRMS for
creating the RuleAgent)
In the .properties file, I put the following options:
newInstance=true
poll=30
....
So, what I got on the console are the following messages, everytime my
checking service is contacted:
11:32:18,484 ERROR [STDERR] RuleAgent(ruleconfig) INFO (Fri Aug 22 11:32:18
CEST 2008): Applying changes to the rulebase.
11:32:18,484 ERROR [STDERR] RuleAgent(ruleconfig) INFO (Fri Aug 22 11:32:18
CEST 2008): Creating a new rulebase as per settings.
11:32:18,484 ERROR [STDERR] RuleAgent(ruleconfig) INFO (Fri Aug 22 11:32:18
CEST 2008): Adding package called mypackage1
The questions:
- why the ERROR [STDERR]?Is there any problem the RE is trying to show?
- Rules should be updateable, but less regularly (probably several times /
year). I set newInstance=true so that the webapp always gets the most
updated rules, but seeing that everytime calls are made, new rulebase is
created as well, I'm worried that there will be too many ressources in use.
Or am I wrong? Is there any alternative how to do this more efficiently?
- what is actually "poll" for? If I already get a fresh ruleagent for every
call, do I still need this one?
The webapp is still in testing phase, but later it should be used in a kind
of mini-cluster as well. Is BRMS also suitable in cluster-environment? Or is
there any limitation for the purpose?
Many thanks for any idea/critics/suggestions/tips, etc. Really appreciate
any response!
Regards
--
View this message in context: http://www.nabble.com/DROOLS-with-BRMS-in-J2EE-Environment-tp19165098p191...
Sent from the drools - user mailing list archive at Nabble.com.
18 years, 1 month
Drools problem in Seam
by Earnest Dyke
Greetings all,
I posted this to the Seam users forum and they recommended I post it here as well.
I am using Seam 2.0.0 and Drools 4.0.7. I am getting the following exception when my rule is compiled on first access.
Rule:
package org.ebsinc.ia.rules
#list any import classes here.
import org.ebsinc.ia.entity.BenefitAnalysis;
import org.ebsinc.ia.entity.RetirementEligibility;
#declare any global variables here
rule "Verify FERS"
when
$ba : BenefitAnalysis(plan == "FERS")
$elig : RetirementEligibility(eligible == false)
then
System.out.println("FERS retirement");
$elig.setReason("ok");
end
components.xml
<drools:rule-base name="securityRules" >
<drools:rule-files>
<value>/security.drl</value>
</drools:rule-files>
</drools:rule-base>
<drools:rule-base name="retirementEligibility">
<drools:rule-files>
<value>/RetirementEligibility.drl</value>
</drools:rule-files>
</drools:rule-base>
<drools:managed-working-memory name="retirementEligibilityWM" scope="event"
auto-create="true" rule-base="#{retirementEligibility}" />
Exception:
2008-08-26
08:40:37,750 ERROR [STDERR] at
org.drools.rule.builder.dialect.java.JavaConsequenceBuilder.build(JavaConsequenceBuilder.java:123)
at org.drools.rule.builder.RuleBuilder.build(RuleBuilder.java:67)
at org.drools.compiler.PackageBuilder.addRule(PackageBuilder.java:446)
at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:304)
at org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:167)
at org.jboss.seam.drools.RuleBase.compileRuleBase(RuleBase.java:58)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.jboss.seam.util.Reflections.invoke(Reflections.java:21)
at org.jboss.seam.util.Reflections.invokeAndWrap(Reflections.java:125)
at org.jboss.seam.Component.callComponentMethod(Component.java:2074)
at org.jboss.seam.Component.callCreateMethod(Component.java:1997)
at org.jboss.seam.Component.newInstance(Component.java:1968)
at org.jboss.seam.Component.getInstance(Component.java:1865)
at org.jboss.seam.Component.getInstance(Component.java:1832)
at org.jboss.seam.Namespace.getComponentInstance(Namespace.java:55)
at org.jboss.seam.Namespace.getComponentInstance(Namespace.java:50)
at org.jboss.seam.el.SeamELResolver.resolveBase(SeamELResolver.java:166)
at org.jboss.seam.el.SeamELResolver.getValue(SeamELResolver.java:53)
at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:53)
at com.sun.faces.el.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:64)
at org.jboss.el.parser.AstIdentifier.getValue(AstIdentifier.java:44)
at org.jboss.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186)
at org.jboss.seam.core.Expressions$1.getValue(Expressions.java:112)
at org.jboss.seam.drools.ManagedWorkingMemory.getRuleBaseFromValueBinding(ManagedWorkingMemory.java:78)
at org.jboss.seam.drools.ManagedWorkingMemory.getStatefulSession(ManagedWorkingMemory.java:67)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.jboss.seam.util.Reflections.invoke(Reflections.java:21)
at org.jboss.seam.util.Reflections.invokeAndWrap(Reflections.java:125)
at org.jboss.seam.Component.callComponentMethod(Component.java:2074)
at org.jboss.seam.Component.unwrap(Component.java:2100)
at org.jboss.seam.Component.getInstance(Component.java:1879)
at org.jboss.seam.Component.getInstance(Component.java:1832)
at org.jboss.seam.Component.getInstanceInAllNamespaces(Component.java:2174)
at org.jboss.seam.Component.getValueToInject(Component.java:2126)
at org.jboss.seam.Component.injectAttributes(Component.java:1590)
at org.jboss.seam.Component.inject(Component.java:1408)
at org.jboss.seam.core.BijectionInterceptor.aroundInvoke(BijectionInterceptor.java:45)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
at org.jboss.seam.core.MethodContextInterceptor.aroundInvoke(MethodContextInterceptor.java:42)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
at org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java:106)
at org.jboss.seam.intercept.JavaBeanInterceptor.interceptInvocation(JavaBeanInterceptor.java:155)
at org.jboss.seam.intercept.JavaBeanInterceptor.invoke(JavaBeanInterceptor.java:91)
at org.ebsinc.ia.action.AgentAction_$$_javassist_2.getClientSearchKey2(AgentAction_$$_javassist_2.java)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at javax.el.BeanELResolver.getValue(BeanELResolver.java:62)
at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:53)
at com.sun.faces.el.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:64)
at org.jboss.el.parser.AstPropertySuffix.getValue(AstPropertySuffix.java:53)
at org.jboss.el.parser.AstValue.getValue(AstValue.java:67)
at org.jboss.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186)
at com.sun.facelets.el.TagValueExpression.getValue(TagValueExpression.java:71)
... 89 more
Caused by: org.mvel.UnresolveablePropertyException: unable to resolve token: declr.identifier
at org.mvel.ASTNode.getReducedValue(ASTNode.java:324)
at org.mvel.ast.PropertyASTNode.getReducedValue(PropertyASTNode.java:32)
at org.mvel.MVELInterpretedRuntime.parseAndExecuteInterpreted(MVELInterpretedRuntime.java:110)
at org.mvel.MVELInterpretedRuntime.parse(MVELInterpretedRuntime.java:58)
at org.mvel.TemplateInterpreter.execute(TemplateInterpreter.java:403)
18 years, 1 month
Drools problem in Seam
by Earnest Dyke
Greetings all,
I posted this to the Seam users forum and they recommended I post it here as well.
I am using Seam 2.0.0 and Drools 4.0.7. I am getting the following exception when my rule is compiled on first access.
Rule:
package org.ebsinc.ia.rules
#list any import classes here.
import org.ebsinc.ia.entity.BenefitAnalysis;
import org.ebsinc.ia.entity.RetirementEligibility;
#declare any global variables here
rule "Verify FERS"
when
$ba : BenefitAnalysis(plan == "FERS")
$elig : RetirementEligibility(eligible == false)
then
System.out.println("FERS retirement");
$elig.setReason("ok");
end
components.xml
<drools:rule-base name="securityRules" >
<drools:rule-files>
<value>/security.drl</value>
</drools:rule-files>
</drools:rule-base>
<drools:rule-base name="retirementEligibility">
<drools:rule-files>
<value>/RetirementEligibility.drl</value>
</drools:rule-files>
</drools:rule-base>
<drools:managed-working-memory name="retirementEligibilityWM" scope="event"
auto-create="true" rule-base="#{retirementEligibility}" />
Exception:
2008-08-26
08:40:37,750 ERROR [STDERR] at
org.drools.rule.builder.dialect.java.JavaConsequenceBuilder.build(JavaConsequenceBuilder.java:123)
at org.drools.rule.builder.RuleBuilder.build(RuleBuilder.java:67)
at org.drools.compiler.PackageBuilder.addRule(PackageBuilder.java:446)
at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:304)
at org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:167)
at org.jboss.seam.drools.RuleBase.compileRuleBase(RuleBase.java:58)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.jboss.seam.util.Reflections.invoke(Reflections.java:21)
at org.jboss.seam.util.Reflections.invokeAndWrap(Reflections.java:125)
at org.jboss.seam.Component.callComponentMethod(Component.java:2074)
at org.jboss.seam.Component.callCreateMethod(Component.java:1997)
at org.jboss.seam.Component.newInstance(Component.java:1968)
at org.jboss.seam.Component.getInstance(Component.java:1865)
at org.jboss.seam.Component.getInstance(Component.java:1832)
at org.jboss.seam.Namespace.getComponentInstance(Namespace.java:55)
at org.jboss.seam.Namespace.getComponentInstance(Namespace.java:50)
at org.jboss.seam.el.SeamELResolver.resolveBase(SeamELResolver.java:166)
at org.jboss.seam.el.SeamELResolver.getValue(SeamELResolver.java:53)
at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:53)
at com.sun.faces.el.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:64)
at org.jboss.el.parser.AstIdentifier.getValue(AstIdentifier.java:44)
at org.jboss.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186)
at org.jboss.seam.core.Expressions$1.getValue(Expressions.java:112)
at org.jboss.seam.drools.ManagedWorkingMemory.getRuleBaseFromValueBinding(ManagedWorkingMemory.java:78)
at org.jboss.seam.drools.ManagedWorkingMemory.getStatefulSession(ManagedWorkingMemory.java:67)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.jboss.seam.util.Reflections.invoke(Reflections.java:21)
at org.jboss.seam.util.Reflections.invokeAndWrap(Reflections.java:125)
at org.jboss.seam.Component.callComponentMethod(Component.java:2074)
at org.jboss.seam.Component.unwrap(Component.java:2100)
at org.jboss.seam.Component.getInstance(Component.java:1879)
at org.jboss.seam.Component.getInstance(Component.java:1832)
at org.jboss.seam.Component.getInstanceInAllNamespaces(Component.java:2174)
at org.jboss.seam.Component.getValueToInject(Component.java:2126)
at org.jboss.seam.Component.injectAttributes(Component.java:1590)
at org.jboss.seam.Component.inject(Component.java:1408)
at org.jboss.seam.core.BijectionInterceptor.aroundInvoke(BijectionInterceptor.java:45)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
at org.jboss.seam.core.MethodContextInterceptor.aroundInvoke(MethodContextInterceptor.java:42)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
at org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java:106)
at org.jboss.seam.intercept.JavaBeanInterceptor.interceptInvocation(JavaBeanInterceptor.java:155)
at org.jboss.seam.intercept.JavaBeanInterceptor.invoke(JavaBeanInterceptor.java:91)
at org.ebsinc.ia.action.AgentAction_$$_javassist_2.getClientSearchKey2(AgentAction_$$_javassist_2.java)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at javax.el.BeanELResolver.getValue(BeanELResolver.java:62)
at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:53)
at com.sun.faces.el.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:64)
at org.jboss.el.parser.AstPropertySuffix.getValue(AstPropertySuffix.java:53)
at org.jboss.el.parser.AstValue.getValue(AstValue.java:67)
at org.jboss.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186)
at com.sun.facelets.el.TagValueExpression.getValue(TagValueExpression.java:71)
... 89 more
Caused by: org.mvel.UnresolveablePropertyException: unable to resolve token: declr.identifier
at org.mvel.ASTNode.getReducedValue(ASTNode.java:324)
at org.mvel.ast.PropertyASTNode.getReducedValue(PropertyASTNode.java:32)
at org.mvel.MVELInterpretedRuntime.parseAndExecuteInterpreted(MVELInterpretedRuntime.java:110)
at org.mvel.MVELInterpretedRuntime.parse(MVELInterpretedRuntime.java:58)
at org.mvel.TemplateInterpreter.execute(TemplateInterpreter.java:403)
18 years, 1 month
