Re: [rules-users] Problem with logging using Drools 5.3.0
Thx, Mark for your advice. I use my own implementation of SystemEventListener now, which uses the log4j Logger for logging. This works fine. -- View this message in context: http://drools.46999.n3.nabble.com/Problem-with-logging-using-Drools-5-3-0-tp3934918p3937481.html Sent from the Drools: User forum mailing list archive at Nabble.com. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] Need Help: Error creating bean with name 'kbase'
Hi everyone. I am new to Drools and Spring MVC. I tried out the example from http://blog.athico.com/2011/01/rules-based-validation-using-drools.html http://blog.athico.com/2011/01/rules-based-validation-using-drools.html but still I am getting an error. I have beeng looking over the net for hours now. and have tried everything i can/know to make it work. I also have tried multiple tutorials, blogs etc. But i still cant seem to get away from that error. I would greatly appreciate any help. Thanks in advance. *Servlet Context* === ?xml version=1.0 encoding=UTF-8? beans:beans xmlns=http://www.springframework.org/schema/mvc; xmlns:xsi=http://www.w3.org/2001/XMLSchema-instance; xmlns:beans=http://www.springframework.org/schema/beans; xmlns:context=http://www.springframework.org/schema/context; xmlns:drools=http://drools.org/schema/drools-spring; xsi:schemaLocation=http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://drools.org/schema/drools-spring http://anonsvn.jboss.org/repos/labs/labs/jbossrules/trunk/drools-container/drools-spring/src/main/resources/org/drools/container/spring/drools-spring.xsd; annotation-driven / resources mapping=/resources/** location=/resources/ / beans:bean class=org.springframework.web.servlet.view.InternalResourceViewResolver beans:property name=prefix value=/WEB-INF/views/ / beans:property name=suffix value=.jsp / /beans:bean context:component-scan base-package=com.spring.mvc / drools:kbase id=kbase drools:resources drools:resource type=DRL source=classpath:validation.drl/drools:resource /drools:resources /drools:kbase drools:ksession id=ksession type=stateless name=ksession kbase=kbase / beans:bean id=validator class=org.springframework.validation.beanvalidation.LocalValidatorFactoryBean/beans:bean beans:bean id=collaborators class=com.spring.mvc.validation.Collaborators beans:constructor-arg beans:map beans:entry key=applicantDao value-ref=applicantDao/beans:entry /beans:map /beans:constructor-arg /beans:bean beans:bean id=applicantDao class=com.spring.mvc.service.ApplicantDaoImpl/beans:bean /beans:beans === *Here's the exception* === INFO: ERROR: org.springframework.web.servlet.DispatcherServlet - Context initialization failed org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'kbase': Cannot create inner bean '(inner bean)' of type [org.drools.container.spring.beans.DroolsResourceAdapter] while setting bean property 'resources' with key [0]; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name '(inner bean)#16': Error setting property values; nested exception is org.springframework.beans.PropertyBatchUpdateException; nested PropertyAccessExceptions (1) are: PropertyAccessException 1: org.springframework.beans.MethodInvocationException: Property 'resource' threw exception; nested exception is java.lang.NoSuchMethodError: org.drools.util.ClassLoaderUtil.getClassLoader([Ljava/lang/ClassLoader;Ljava/lang/Class;Z)Lorg/drools/util/CompositeClassLoader; at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveInnerBean(BeanDefinitionValueResolver.java:281) at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:125) at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveManagedList(BeanDefinitionValueResolver.java:353) at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:153) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1360) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1118) at
Re: [rules-users] How to query rules to create reports to analyze usage
Thanks Wolfgang, But don't the rules tables have basic info like 'last run date and time and user' type info... Also how to setup an AgendaEventListener Really appreciate your knowledge sharing --- On Tue, 4/24/12, Wolfgang Laun wolfgang.l...@gmail.com wrote: From: Wolfgang Laun wolfgang.l...@gmail.com Subject: Re: [rules-users] How to query rules to create reports to analyze usage To: Rules Users List rules-users@lists.jboss.org Date: Tuesday, April 24, 2012, 4:30 AM For analyzing rules usage an AgendaEventListener should be used to register the information you are interested in. (You wouldn't need to query the rules DB for this anyway.) -W On 24/04/2012, thatz thomash...@yahoo.com wrote: Am new user to Drools, have 300+ rules, but need to query them using SQL syntax to create reports and analyze rules usage (if rules are being called, etc.). App developer said cannot query the rules db directly because it is proprietary. Is there anyway to query rules or what is best way to analyze rules usage. Thanks -- View this message in context: http://drools.46999.n3.nabble.com/How-to-query-rules-to-create-reports-to-analyze-usage-tp3934833p3934833.html Sent from the Drools: User forum mailing list archive at Nabble.com. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] Redundancy check option not working in Drools Verifier 5.4
Hi All,
I tried to use Drools Verifier to validate the available rules. I got all
the warning types like MISSING_EQUALITY, ALWAYS_FALSE. But I couldn t get
the redundancy warning, eventhough i have given the duplicate rules
explicitly.
I am using Drools Verifier 5.4.0.Final.
Herewith given the following details,
1. Sample rule file
rule rule 1
when
$server : Server(processors==2, memory==1024)
then
System.out.println(rule 1)
end
rule rule 2
when
$server : Server(processors==2, processors!=2)
then
System.out.println(rule)
end
rule rule 3
when
$server : Server(processors==2, memory==1024)
then
System.out.println(rule 3)
end
2. Code which verifies the validity of the rule.
VerifierBuilder vBuilder = VerifierBuilderFactory.newVerifierBuilder();
Verifier verifier = vBuilder.newVerifier();
verifier.addResourcesToVerify(new
ClassPathResource(sample.drl,
DroolsVerifierCheck.class),
ResourceType.DRL);
verifier.fireAnalysis();
VerifierReport result = verifier.getResult();
// To display the warnings in verifier.
CollectionVerifierMessageBase warningMessages =
result.getBySeverity(Severity.WARNING);
for (VerifierMessageBase msg : warningMessages) {
System.out.println(Note: + msg.getMessage() +
type: + msg.getMessageType() +
on: + msg.getFaulty());
}
Problem
In the sample rule, you can find rule 1 and rule 3 are same. But I didn t
get the warning for redundancy.
Research done
When i debug the code, i found like the rule Find redundant pattern
possibilities from rule possibilities and Find redundant restrictions from
pattern possibilities are loaded into the Knowledge base created and tagged
with Agenda group as Main, but those are not present in the Knowledge
session created (I mean after inserting the objects into the Knowledge
session in the code : VerifierImpl.java).
Also can anybody explain when a rule will be present in the knowledge base
but not selected by the agenda. I haven t modified anything in the
AgendaFilter and its given the default value ScopeAgendaFilter.
Kindly let me know why the redundancy warning is not given in my case ?
P.S : I have gone through the post below,
http://http://drools.46999.n3.nabble.com/Drools-verifier-td2681002.html
http://drools.46999.n3.nabble.com/Drools-verifier-td2681002.html
and at the bottom they have asked the same question, but there is no answer
available for it.
Thanks,
Prasanna.
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[rules-users] Drools Guvnor - validate a rule results in Unable to Analyse Expression
Hi folks,
I have defined some rules in Eclipse and tested with JUnit tests and
everything was fine.
Now I defined the rules in Guvnor and while validating I get the following
error:
[CardTrapping] Unable to Analyse Expression Fraud fraud = new
Fraud(Fraud.CARD_TRAPPING, new SSTEvent[] { $event1, $event2, $event3,
$event4 }); fraudControl.handleFraud(fraud);: [Error: expected type:
com.wn.fraud.droolstest.model.SSTEvent; but found:
com.wn.fraud.droolstest.model.SSTEvent] [Near : {... SSTEvent[] { $event1,
$event2, $event3, $event4 }) }] ^ [Line: 1, Column: 70]
I have imported my data model, before creating the rules, therefor for the
type SSTEvent an import is defined. But it seems, that the type SSTEvent
exists with different versions?
I have this problem for each rule, when I'm using the SSTEvent type in the
then case.
Here the complete rule defintion:
package com.wn.fraud.droolstest
import com.wn.fraud.droolstest.model.Fraud;
import com.wn.fraud.droolstest.model.FraudControl;
import com.wn.fraud.droolstest.model.SSTEvent;
global FraudControl fraudControl;
rule CardTrapping
when
$event1 : SSTEvent ( eventNumber == SSTEvent.CARD_JAMMED ) from
entry-point device-event-stream
$event2 : SSTEvent ( this after [ 0s, 30s ] $event1,
eventNumber == SSTEvent.IN_SERVICE,
deviceId == $event1.deviceId,
branchName == $event1.branchName ) from entry-point
device-event-stream
$event3 : SSTEvent ( this after [ 0s, 30s ] $event2,
eventNumber == SSTEvent.CARD_JAMMED,
deviceId == $event1.deviceId,
branchName == $event1.branchName ) from entry-point
device-event-stream
$event4 : SSTEvent ( this after [ 0s, 30s ] $event3,
eventNumber == SSTEvent.IN_SERVICE,
deviceId == $event1.deviceId,
branchName == $event1.branchName ) from entry-point
device-event-stream
then
// inform fraud control
Fraud fraud = new Fraud(Fraud.CARD_TRAPPING, new SSTEvent[] {
$event1, $event2, $event3, $event4 });
fraudControl.handleFraud(fraud);
end
Thx a lot for help!
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Re: [rules-users] How to query rules to create reports to analyze usage
On 25/04/2012, thomash...@yahoo.com thomash...@yahoo.com wrote:
Thanks Wolfgang,
But don't the rules tables have basic info like 'last run date and time and
user' type info...
I'm not aware of any such information being collected and stored
automatically. But if this is a Guvnor function, I may have a very
blind spot there.
Also how to setup an AgendaEventListener
It's done as with any other listener in JDK etc. Here are some code
snippets to get you started. This code is not necessarily best
practice or anything; it's meant to illustrate the essentials. The
constructor installs the listener.
public class AgendaWatcher implements AgendaEventListener {
// useful aux. method
private String ruleNameOfEvent( ActivationEvent actEvent ){
Activation activation = actEvent.getActivation();
Rule rule = activation.getRule();
return rule.getPackageName() + '.' + rule.getName();
}
public AgendaWatcher( KnowledgeRuntime knowledgeRuntime ){
knowledgeRuntime.addEventListener( (AgendaEventListener)this );
}
@Override
public void activationCancelled(ActivationCancelledEvent actEvent) {
// happens frequently, for various reasons. may not be of interest.
}
@Override
public void activationCreated(ActivationCreatedEvent actEvent) {
// same thing.
}
@Override
public void beforeActivationFired(BeforeActivationFiredEvent arg0) {
}
@Override
public void afterActivationFired(AfterActivationFiredEvent actEvent) {
// count firings
Counts counts = getCountsForName( ruleNameOfEvent( actEvent ) );
counts.firings++;
}
@Override
public void agendaGroupPopped(AgendaGroupPoppedEvent arg0) {
}
@Override
public void agendaGroupPushed(AgendaGroupPushedEvent arg0) {
}
}
Really appreciate your knowledge sharing
--- On Tue, 4/24/12, Wolfgang Laun wolfgang.l...@gmail.com wrote:
From: Wolfgang Laun wolfgang.l...@gmail.com
Subject: Re: [rules-users] How to query rules to create reports to analyze
usage
To: Rules Users List rules-users@lists.jboss.org
Date: Tuesday, April 24, 2012, 4:30 AM
For analyzing rules usage an
AgendaEventListener should be used to
register the information you are interested in. (You
wouldn't need to
query the rules DB for this anyway.)
-W
On 24/04/2012, thatz thomash...@yahoo.com
wrote:
Am new user to Drools, have 300+ rules, but need to
query them using SQL
syntax to create reports and analyze rules usage (if
rules are being called,
etc.). App developer said cannot query the rules
db directly because it is
proprietary. Is there anyway to query rules or
what is best way to analyze
rules usage. Thanks
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Re: [rules-users] How to query rules to create reports to analyze usage
The OP has not said if he uses Guvnor or not. We can only guess.
Last run date is a run-time metric. Guvnor only contains design-time
metrics. Therefore you'll have to devise your own mechanism using
AgendaListener as Wolfgang proposes.
Author (and other such metadata) is stored in Guvnor and is (probably)
available using the REST API - but it'll be on a per-asset basis and
definitely not lend itself to batch querying (e.g. as with a RDBMS) as you
imply.
Rule validity is another analysis you do not mention. drools-verifier may
be able to help there.
On 25 April 2012 17:43, Wolfgang Laun wolfgang.l...@gmail.com wrote:
On 25/04/2012, thomash...@yahoo.com thomash...@yahoo.com wrote:
Thanks Wolfgang,
But don't the rules tables have basic info like 'last run date and time
and
user' type info...
I'm not aware of any such information being collected and stored
automatically. But if this is a Guvnor function, I may have a very
blind spot there.
Also how to setup an AgendaEventListener
It's done as with any other listener in JDK etc. Here are some code
snippets to get you started. This code is not necessarily best
practice or anything; it's meant to illustrate the essentials. The
constructor installs the listener.
public class AgendaWatcher implements AgendaEventListener {
// useful aux. method
private String ruleNameOfEvent( ActivationEvent actEvent ){
Activation activation = actEvent.getActivation();
Rule rule = activation.getRule();
return rule.getPackageName() + '.' + rule.getName();
}
public AgendaWatcher( KnowledgeRuntime knowledgeRuntime ){
knowledgeRuntime.addEventListener( (AgendaEventListener)this );
}
@Override
public void activationCancelled(ActivationCancelledEvent actEvent) {
// happens frequently, for various reasons. may not be of interest.
}
@Override
public void activationCreated(ActivationCreatedEvent actEvent) {
// same thing.
}
@Override
public void beforeActivationFired(BeforeActivationFiredEvent arg0) {
}
@Override
public void afterActivationFired(AfterActivationFiredEvent actEvent) {
// count firings
Counts counts = getCountsForName( ruleNameOfEvent( actEvent ) );
counts.firings++;
}
@Override
public void agendaGroupPopped(AgendaGroupPoppedEvent arg0) {
}
@Override
public void agendaGroupPushed(AgendaGroupPushedEvent arg0) {
}
}
Really appreciate your knowledge sharing
--- On Tue, 4/24/12, Wolfgang Laun wolfgang.l...@gmail.com wrote:
From: Wolfgang Laun wolfgang.l...@gmail.com
Subject: Re: [rules-users] How to query rules to create reports to
analyze
usage
To: Rules Users List rules-users@lists.jboss.org
Date: Tuesday, April 24, 2012, 4:30 AM
For analyzing rules usage an
AgendaEventListener should be used to
register the information you are interested in. (You
wouldn't need to
query the rules DB for this anyway.)
-W
On 24/04/2012, thatz thomash...@yahoo.com
wrote:
Am new user to Drools, have 300+ rules, but need to
query them using SQL
syntax to create reports and analyze rules usage (if
rules are being called,
etc.). App developer said cannot query the rules
db directly because it is
proprietary. Is there anyway to query rules or
what is best way to analyze
rules usage. Thanks
--
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[rules-users] Guvnor and Joda time
Do we support Joda time objects in Guvnor (5.3)? I did add joda time jar on the classpath (Guvnor's lib folder) and there is no class not found exception. However I get following exception when trying to access the deployment snapshot. The snapshot worked fine when I was using Date. After switching to Joda time, I did reload the POJO model and regenerated the deployment snapshot. I am using 5.3.final. java.lang.NullPointerException at java.io.OutputStream.write(OutputStream.java:58) at org.drools.guvnor.server.files.FileManagerUtils.loadBinaryPackage(FileManagerUtils.java:196) 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:597) at org.jboss.seam.util.Reflections.invoke(Reflections.java:22) at org.jboss.seam.intercept.RootInvocationContext.proceed(RootInvocationContext.java:32) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:56) at org.jboss.seam.transaction.RollbackInterceptor.aroundInvoke(RollbackInterceptor.java:28) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68) at org.jboss.seam.core.BijectionInterceptor.aroundInvoke(BijectionInterceptor.java:77) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68) at org.jboss.seam.core.MethodContextInterceptor.aroundInvoke(MethodContextInterceptor.java:44) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68) at org.jboss.seam.security.SecurityInterceptor.aroundInvoke(SecurityInterceptor.java:163) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68) at org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java:107) at org.jboss.seam.intercept.JavaBeanInterceptor.interceptInvocation(JavaBeanInterceptor.java:185) at org.jboss.seam.intercept.JavaBeanInterceptor.invoke(JavaBeanInterceptor.java:103) at org.drools.guvnor.server.files.FileManagerUtils_$$_javassist_seam_10.loadBinaryPackage(FileManagerUtils_$$_javassist_seam_10.java) at org.drools.guvnor.server.files.PackageDeploymentServlet$1.execute(PackageDeploymentServlet.java:252) at org.drools.guvnor.server.files.RepositoryServlet.doAuthorizedAction(RepositoryServlet.java:75) at org.drools.guvnor.server.files.PackageDeploymentServlet.doGet(PackageDeploymentServlet.java:130) at javax.servlet.http.HttpServlet.service(HttpServlet.java:625) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.jboss.seam.web.ContextFilter$1.process(ContextFilter.java:42) at org.jboss.seam.servlet.ContextualHttpServletRequest.run(ContextualHttpServletRequest.java:65) at org.jboss.seam.web.ContextFilter.doFilter(ContextFilter.java:37) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) at java.lang.Thread.run(Thread.java:662) -- But beware of the Dark Side. Anger, fear, aggression - the Dark Side of the Force are they. -Yoda ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Getting Error while using Drools 5.3.0
Hi,
Thanks for the reply.
In my application,one of the input parameters is Year.In my java class,I am
getting the modelyear from year and converting it an integer.But even then,
I am getting the error posted earlier.Here is my rule file:
rule Set Time To Live
when
there is a restoration request
then
set quote process time to live to: 15
add additional action check state regulation for vintage car
restoration
end
#validation
rule Year is required
no-loop true
when
request does not contain model year
then
set reason of rejection to year is required
reject request
end
#additional action
rule VIN required for newer vehicles
no-loop true
when
request contains no VIN and the car was built after year 1982
then
ask the customer to provide VIN
end
and here is my java class:
public class QuoteRequest {
private Contact contact;
private Address address;
private String make;
private String model;
private String style;
private String year;
private String VIN;
private String condition;
private String description;
private String zip;
private ListLink links = new ArrayListLink();
public static void printForMe() {
System.out.println(printing for you);
}
public Contact getContact() {
return contact;
}
public void setContact(Contact contact) {
this.contact = contact;
}
public Address getAddress() {
return address;
}
public void setAddress(Address address) {
this.address = address;
}
public String getMake() {
return make;
}
public void setMake(String make) {
this.make = make;
}
public String getModel() {
return model;
}
public void setModel(String model) {
this.model = model;
}
public String getStyle() {
return style;
}
public void setStyle(String style) {
this.style = style;
}
public String getYear() {
return returnString(year);
}
public Integer getModelYear() {
Integer modelYear = (getYear() == null) ? null :
Integer.parseInt(year);
return modelYear;
}
public void setYear(String year) {
this.year = year;
}
public String getVIN() {
return returnString(VIN);
}
public void setVIN(String vin) {
VIN = vin;
}
public String getCondition() {
return condition;
}
public void setCondition(String condition) {
this.condition = condition;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public String getZip() {
return zip;
}
public void setZip(String zip) {
this.zip = zip;
}
public ListLink getLinks() {
return links;
}
public void setLinks(ListLink links) {
this.links = links;
}
private String returnString(String s) {
return (s == null || s.isEmpty()) ? null : s;
}
}
Are there any changes I need to make any changes to the java class to fix
the error I am seeing?
Thanks.
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Re: [rules-users] Best practice for 0..1 relations
Aha, that makes sense! I didn't realize you could bind a variable from two different branches of an or. Following that pattern, my strawman rule becomes this: rule household income when $p1 : Person() ((not Relation(person1 == $p1, type == spouse) and $p2income : int from 0) or Relation(person1 == $p1, type == spouse, $p2income: person2.getIncome())) then insertLogical(new Income($p1.getIncome() + $p2income)); end Thanks! That's a good compromise of readability and maintainability. Chris -Original Message- From: rules-users-boun...@lists.jboss.org [mailto:rules-users-boun...@lists.jboss.org] On Behalf Of Mark Proctor Sent: Tuesday, April 24, 2012 9:12 PM To: rules-users@lists.jboss.org Subject: Re: [rules-users] Best practice for 0..1 relations On 23/04/2012 21:31, Christopher Dolan wrote: Sorry, I wasn't clear... In the example, it's the spouse that's the optional fact. I want the rule to fire whether or not a spouse exists, but the RHS computes the income differently if a spouse exists or not. If a spouse is added/removed, I want the rule to re-fire and the income should be changed. Take a look at my Pong game and the Create Ball rule https://github.com/droolsjbpm/drools/blob/master/drools-examples/src/main/resources/org/drools/games/pong/init.drl I create a ball with different dx directions depend on different states, all from within one rule: rule Create Ball when not Ball() ( PointWin(player.id == PlayerId.PlayerOne ) and dx : Number() from 2 ) or ( PointWin(player.id == PlayerId.PlayerTwo ) and dx : Number() from -2 ) or ( not PointWin( ) and dx : Number() from -2 ) then ball = new Ball( (pconf.tableWidth/2)-(pconf.ballWidth/2), (pconf.tableHeight/2)-(pconf.ballWidth/2), pconf.ballWidth); ball.speed = pconf.ballStartingSpeed; ball.dx = dx; insert( ball ); end Chris -Original Message- From: rules-users-boun...@lists.jboss.org [mailto:rules-users-boun...@lists.jboss.org] On Behalf Of Welsh, Armand Sent: Monday, April 23, 2012 3:22 PM To: rules-users@lists.jboss.org Subject: Re: [rules-users] Best practice for 0..1 relations So, I assume the fact that is not needed in the LHS is Income. By inserting Income into Working Memory, you are subjecting it to rete evaluation against the current knowledge tree. I consider the cost of each operation. Insert is very costly, and insertLogical even more costly. I don't know anything about how your data model is built, but based on this very simple example, I would think you would be better off with a Global like this: Global Income income Style 1: one rule for each scenario rule household income, single when $p1 : Person() not Relation(person1 == $p1, type == spouse) then income = new Income($p1.getIncome()); end rule household income, married when $p1 : Person() Relation(person1 == $p1, type == spouse, $p2: person2) then income = new Income($p1.getIncome() + $p2.getIncome()); end Style 2: a single rule with a collection rule household income when $p1 : Person() $rels : List() from collect(Relation($p1 == person1, type == spouse)) then income = new Income($p1.getIncome() + ($rels.size() == 0 ? 0 : $rels.get(0).getPerson2().getIncome()); end Then in code, you can get the Global value to determine what it got set to, if you need outside of the Drools processing. All thread safety factors must be considered in a multi-threaded environment. Global are not objects know to rete, and therefore, use of them is very fast in the LHS. And the RHS is never aware of changes to Globals (drools assumes them to be static values, that do not change) so care must be taken if using them in the RHS of rules, which I would advise against doing except for special cases where you know a change in the global variable won't be a problem (such as this simple scenario where the global is not used in the RHS at all). -Original Message- From: rules-users-boun...@lists.jboss.org [mailto:rules-users-boun...@lists.jboss.org] On Behalf Of Christopher Dolan Sent: Monday, April 23, 2012 1:01 PM To: rules-users@lists.jboss.org Subject: [rules-users] Best practice for 0..1 relations What's the best way to encode a fact that's needed in the RHS but is not important in the LHS? Consider a contrived example of computing total household income for single or married persons. I can think of two ways to encode this rule, but I don't like either of them: Style 1: one rule for each scenario rule household income, single when $p1 : Person() not Relation(person1 == $p1,
Re: [rules-users] Best practice for 0..1 relations
The fact that you can bind from a constant is good to know. But if I can give my feeling, I don't think that this more readable nor more maintainable. To me, if you really want to factorize, using accumulate is better ... Mark's rule has a relatively big an complex 'then' part that justify an extreme conditions factorization, which is not really your case. But this is just a matter of taste ... Here is my ideal rule for this problem, using accumulate : rule household income when $p1 : Person() $additionnalIncome : Number() from accumulate ( Relation(person1 == $p1, type == spouse, $p2income: person2.getIncome()) , sum( $p2income ) ) then insertLogical(new Income($p1.getIncome() + $additionnalIncome)); end Note that this is working for multiple spouses too ... But I have one question : will this work properly with insertLogical ? - Mail original - De: Christopher Dolan christopher.do...@avid.com À: Rules Users List rules-users@lists.jboss.org Envoyé: Mercredi 25 Avril 2012 20:39:14 Objet: Re: [rules-users] Best practice for 0..1 relations Aha, that makes sense! I didn't realize you could bind a variable from two different branches of an or. Following that pattern, my strawman rule becomes this: rule household income when $p1 : Person() ((not Relation(person1 == $p1, type == spouse) and $p2income : int from 0) or Relation(person1 == $p1, type == spouse, $p2income: person2.getIncome())) then insertLogical(new Income($p1.getIncome() + $p2income)); end Thanks! That's a good compromise of readability and maintainability. Chris -Original Message- From: rules-users-boun...@lists.jboss.org [mailto:rules-users-boun...@lists.jboss.org] On Behalf Of Mark Proctor Sent: Tuesday, April 24, 2012 9:12 PM To: rules-users@lists.jboss.org Subject: Re: [rules-users] Best practice for 0..1 relations On 23/04/2012 21:31, Christopher Dolan wrote: Sorry, I wasn't clear... In the example, it's the spouse that's the optional fact. I want the rule to fire whether or not a spouse exists, but the RHS computes the income differently if a spouse exists or not. If a spouse is added/removed, I want the rule to re-fire and the income should be changed. Take a look at my Pong game and the Create Ball rule https://github.com/droolsjbpm/drools/blob/master/drools-examples/src/main/resources/org/drools/games/pong/init.drl I create a ball with different dx directions depend on different states, all from within one rule: rule Create Ball when not Ball() ( PointWin(player.id == PlayerId.PlayerOne ) and dx : Number() from 2 ) or ( PointWin(player.id == PlayerId.PlayerTwo ) and dx : Number() from -2 ) or ( not PointWin( ) and dx : Number() from -2 ) then ball = new Ball( (pconf.tableWidth/2)-(pconf.ballWidth/2), (pconf.tableHeight/2)-(pconf.ballWidth/2), pconf.ballWidth); ball.speed = pconf.ballStartingSpeed; ball.dx = dx; insert( ball ); end Chris -Original Message- From: rules-users-boun...@lists.jboss.org [mailto:rules-users-boun...@lists.jboss.org] On Behalf Of Welsh, Armand Sent: Monday, April 23, 2012 3:22 PM To: rules-users@lists.jboss.org Subject: Re: [rules-users] Best practice for 0..1 relations So, I assume the fact that is not needed in the LHS is Income. By inserting Income into Working Memory, you are subjecting it to rete evaluation against the current knowledge tree. I consider the cost of each operation. Insert is very costly, and insertLogical even more costly. I don't know anything about how your data model is built, but based on this very simple example, I would think you would be better off with a Global like this: Global Income income Style 1: one rule for each scenario rule household income, single when $p1 : Person() not Relation(person1 == $p1, type == spouse) then income = new Income($p1.getIncome()); end rule household income, married when $p1 : Person() Relation(person1 == $p1, type == spouse, $p2: person2) then income = new Income($p1.getIncome() + $p2.getIncome()); end Style 2: a single rule with a collection rule household income when $p1 : Person() $rels : List() from collect(Relation($p1 == person1, type == spouse)) then income = new Income($p1.getIncome() + ($rels.size() == 0 ? 0 : $rels.get(0).getPerson2().getIncome()); end Then in code, you can get the Global value to determine what it got set to, if you need outside of the Drools processing. All thread safety factors must be considered in a multi-threaded environment. Global are not objects know to rete, and therefore, use of them
Re: [rules-users] Need Help: Error creating bean with name 'kbase'
I am still working on this item today I would greatly appreciate any help. Thanks. -- View this message in context: http://drools.46999.n3.nabble.com/Need-Help-Error-creating-bean-with-name-kbase-tp3937782p3940150.html Sent from the Drools: User forum mailing list archive at Nabble.com. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
