[rules-users] Beginner question about Dynamic Beans
Hi all drools users! I'm just learning Drools from the manual, I have a question about Dynamic Beans. I have added PropertyChangeSupport and listeners to my Beans: I can see that inside my rule, if I change one property the bean. rule Check Age salience 20 when b : Buyer (age 18) then bankApp.addMessage(Messages.AGE_UNDER_18); b.setCash(4); // CHANGE OF PROPERTY end ..then all rules are fired back again. Is it the correct behaviour ? is there a way to re-evaluate only some of the Rules back again ? thanks a lot Francesco -- View this message in context: http://www.nabble.com/Beginner-question-about-Dynamic-Beans-tp18232282p18232282.html Sent from the drools - user mailing list archive at Nabble.com. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Beginner question about Dynamic Beans
Hi Francesco,
On Wed, Jul 2, 2008 at 10:28 AM, fmarchioni [EMAIL PROTECTED] wrote:
Hi all drools users!
I'm just learning Drools from the manual, I have a question about Dynamic
Beans. I have added PropertyChangeSupport and listeners to my Beans: I can
see that inside my rule, if I change
one property the bean.
rule Check Age
salience 20
when
b : Buyer (age 18)
then
bankApp.addMessage(Messages.AGE_UNDER_18);
b.setCash(4); // CHANGE OF PROPERTY
end
..then all rules are fired back again. Is it the correct behaviour ? is
there a way to re-evaluate only some of the Rules back again ?
thanks a lot
Francesco
--
that's strange. From my experience, only those rules that depend on
the cash property should be fired if the new value triggers an
activation that wouldn't have been triggered for the old value. Could
you post the code of your PropertyChangeSupport implementation?
Here's some sample code from one of my projects:
public abstract class BindObject { /* simple proxy */
private PropertyChangeSupport propertyChangeSupport = new
PropertyChangeSupport(this);
public void addPropertyChangeListener(PropertyChangeListener _listener) {
propertyChangeSupport.addPropertyChangeListener(_listener);
}
public void addPropertyChangeListener(String _propertyName,
PropertyChangeListener _listener) {
propertyChangeSupport.addPropertyChangeListener(_propertyName,
_listener);
}
public void removePropertyChangeListener(PropertyChangeListener _listener) {
propertyChangeSupport.removePropertyChangeListener(_listener);
}
public void removePropertyChangeListener(String _propertyName,
PropertyChangeListener _listener) {
propertyChangeSupport.removePropertyChangeListener(_propertyName,
_listener);
}
protected void firePropertyChange(String _propertyName, Object
_oldValue, Object _newValue) {
propertyChangeSupport.firePropertyChange(_propertyName,
_oldValue, _newValue);
}
protected void firePropertyChange(String _propertyName, int
_oldValue, int _newValue) {
propertyChangeSupport.firePropertyChange(_propertyName,
_oldValue, _newValue);
}
protected void firePropertyChange(String _propertyName, boolean
_oldValue, boolean _newValue) {
propertyChangeSupport.firePropertyChange(_propertyName,
_oldValue, _newValue);
}
}
Now I simply inherit my classes from BindObject and write my setters like this:
public final static String PROPERTY_ARTICLE_NUMBER = articleNumber;
public void setArticleNumber(String _articleNumber) {
String oldValue = _articleNumber;
articleNumber = _articleNumber;
firePropertyChange(PROPERTY_ARTICLE_NUMBER, oldValue, articleNumber);
}
This has been working great for me so far.
HTH
Marcus
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Re: [rules-users] simple rule takes long time
Hi All
I have few changes to my data class as suggested above and rule and it seems
to work. But that brings me to another question. Here is my new data class
Data class
public class Data {
private int id =0;
public boolean isCheck = false;
public String name = ;
public Data(int id) {
this.id = id;
name = name+(int)(this.hashCode());
System.out.println(id is +id+ name is +name);
}
public int getId() {
return id;
}
public void setIsCheck() {
isCheck = true;
}
public boolean getIsCheck() {
return isCheck;
}
public String getName() {
return name;
}
}
rule Unique data
no-loop
salience 10
when
$data1: Data( $id1: id,isCheck == false)
$data2: Data( isCheck == true, id == $id1)
then
log.log( data are not unique:+ $data1.getName() + and
+$data2.getName()+ id is +$data2.getId()+ +$data1.getId());
end
rule Change data
no-loop
when
$data: Data(isCheck == false)
then
$data.setIsCheck();
update($data);
end
So you can see from above that I set value false at the start and then set
it to true in a different rule. Now it takes only less then a second to
execute the rule. I was not aware of the fact that each time i insert a rule
it start executing it.
Now my question is
Is it possible to stop working memory to start processing when I am
inserting data ? So don't execute anything untill I am finished adding all
the data and then fireAllrules
thanks ( also thanks to Scott Reed-3 who led to this solution)
Gaurav
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Re: [rules-users] Beginner question about Dynamic Beans
that's strange. From my experience, only those rules that depend on
the cash property should be fired if the new value triggers an
activation that wouldn't have been triggered for the old value. Could
you post the code of your PropertyChangeSupport implementation?
Hi Marcus,
thanks for your reply, well my Bean implementation is:
public class Buyer {
int age;
double yearlyIncome;
double cash;
private final PropertyChangeSupport changes = new PropertyChangeSupport(
this );
public void addPropertyChangeListener(final PropertyChangeListener l) {
this.changes.addPropertyChangeListener( l );
}
public void removePropertyChangeListener(final PropertyChangeListener
l) {
this.changes.removePropertyChangeListener( l );
}
public int getAge() {
return age;
}
public void setAge(int newAge) {
int oldAge = this.age;
this.age = newAge;
this.changes.firePropertyChange(age, oldAge, newAge);
}
public double getCash() {
return cash;
}
public void setCash(double newCash) {
double oldCash = this.cash;
this.cash = newCash;
System.out.println([Buyer ] cash is + this.cash);
this.changes.firePropertyChange(cash, oldCash, newCash);
}
public double getYearlyIncome() {
return yearlyIncome;
}
public void setYearlyIncome(double newYearlyIncome) {
double oldYearlyIncome = this.yearlyIncome;
this.yearlyIncome = newYearlyIncome;
this.changes.firePropertyChange(yearlyIncome, oldYearlyIncome,
newYearlyIncome);
}
}
And my complete Rule file is:
global drools.BankApplication bankApp;
rule Check Age
when
b : Buyer (age 18)
then
System.out.println([Rule.drl] Checking age);
bankApp.addMessage(Messages.AGE_UNDER_18);
b.setCash(4);
end
rule Check Cash
when
b : Buyer (cash 5000)
then
System.out.println([Rule.drl] Checking cash);
System.out.println([Rule.drl] cash is + b.getCash());
bankApp.addMessage(Messages.CASH_LOW );
end
rule Check Income
when
b : Buyer (yearlyIncome 5)
then
System.out.println([Rule.drl] Checking income);
bankApp.addMessage(Messages.INCOME_LOW );
end
And facts are passed to the Working memory this way:
Buyer buyer = new Buyer();
BankApplication bankApp = new BankApplication();
buyer.setAge(15);
buyer.setCash(1000);
buyer.setYearlyIncome(3);
workingMemory.setGlobal(bankApp, bankApp);
workingMemory.insert(buyer,true);
workingMemory.fireAllRules();
Looking at the log file:
14:23:47,109 INFO [STDOUT] [Buyer ] Setted cash with 1000.0
14:23:47,109 INFO [STDOUT] [Rule.drl] Checking income
14:23:47,125 INFO [STDOUT] [Rule.drl] Checking cash
14:23:47,125 INFO [STDOUT] [Rule.drl] cash is 1000.0
14:23:47,125 INFO [STDOUT] [Rule.drl] Checking age
14:23:47,125 INFO [STDOUT] [Buyer ] Setted cash with 4.0
14:23:47,125 INFO [STDOUT] [Rule.drl] Checking income
14:23:47,125 INFO [STDOUT] [Rule.drl] Checking age
14:23:47,125 INFO [STDOUT] [Buyer ]Setted cash with 4.0
I can see that the Rule income has been invoked twice: why if it doesn't
use the cash attribute in it ?
Thanks a lot for your time
Francesco
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[rules-users] New rules in source file not loaded when application redeployed
I am packaging my rules as a drl source file in a jar that is then bundled in a war file that is then deployed to Tomcat. In my implementation, the rulebase is cached the first time it is used in my application, but when I add new rules to the source file and rebuild my application then redeploy it on Tomcat, the new version of the rules don't get loaded into the rulebase. Why and how is an older version of the rules being loaded into the rulebase when I redeploy my application in Tomcat? As FYI, I have developed a business rules service that initializes the rulebase upon a Spring container startup by loading the drl file from the classpath. Is there an internal Drools static cache that is scoped to something other than my application? The only thing I can do to load the new rules is restart Tomcat. When I do this, the new version of the drl source file is loaded and used, so I'm thinking the problem I'm having is somehow related to the class loaders Tomcat uses, but I can't find information about what Drools might be doing internally with a static cache or something like that. Can anyone explain what might be happening and how to configure Drools and/or my application to get around this problem I'm having? I definitely appreciate any help you can provide! Keith ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Function Compilation Error when using JANINO
Janino is only JDK1.4 compatible, so I dont think it supports that for loop.
Mark
Garde, Varun (Equity Linked Technology) wrote:
Hello,
I am trying to use JANINO with drools 4.0.7.
In my rule file I have a function definition, which is throwing a
compilation error with JANINO but works perfectly with ECLIPSE compiler.
The only janino in my classpath is v 2.5.10.
Want to make sure I am not doing something stupid here.
/* Drool File snippet */
function List getFieldsFromDelimiter(String value, String delimiter) {
List fieldList = new ArrayList();
String[] values = value.split(delimiter);
for(String val: values){
fieldList.add(new Field(val));
}
return fieldList;
}
/* Exception trace */
org.drools.rule.InvalidRulePackage: [ getFieldsFromDelimiter : Function
Compilation error
getFieldsFromDelimiter (line:26): File
com/elt/saturn/enumerations/GetFieldsFromDelimiter.java, Line 28, Column
18: Operator ; expected
]com.elt.saturn.enumerations.GetFieldsFromDelimiter.getFieldsFromDelimit
er
at org.drools.rule.Package.checkValidity(Package.java:424)
at
org.drools.common.AbstractRuleBase.addPackage(AbstractRuleBase.java:394)
at
com.ml.elt.saturn.core.functionality.enumerations.DroolsChainComponent.
init(DroolsChainComponent.java:63)
/* Class extract from dump directory */
public class GetFieldsFromDelimiter {
private static final long serialVersionUID = 400L;
public static List getFieldsFromDelimiter(String value,String
delimiter) throws Exception {
List fieldList = new ArrayList();
String[] values = value.split(delimiter);
for(String val: values){//this is line 28
fieldList.add(new Field(val));
}
return fieldList;
}
}
/*
/* Configurations supplied to the PackageBuilderConf */
drools.dialect.java.compiler = JANINO
drools.dialect.java.compiler.lnglevel= 1.5
Any help would be much appreciated.
Thanks,
Varun.
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[rules-users] nqueens or puzzle16 problems
Dear Sir, I am new to Drools and I wonder if any of the classic declarative problems, such as, nqueens, puzzle16 were implemented in Drools by anyone. I realize that might be hard because of the bottom-up evaluation. Regards, Paul Fodor ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] wordnet in drools
Dear Sir, I am new to Drools and I wonder if anyone used WordNet from Drools. Basically, I want to make some simple joins, such as, find words that are in the same synset, all hypernyms of a word, hyponyms, meronyms of verbs, adjectives, etc. Regards, Paul Fodor ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] wordnet in drools
Paul Fodor wrote: Dear Sir, I am new to Drools and I wonder if anyone used WordNet from Drools. Basically, I want to make some simple joins, such as, find words that are in the same synset, all hypernyms of a word, hyponyms, meronyms of verbs, adjectives, etc. I haven't heard of it being applied with Drools. Do let me know your findings if you produce anything interesting. Regards, Paul Fodor ___ 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
Re: [rules-users] how to find the rule name
try String ruleName = ... On Thu, Jul 3, 2008 at 7:09 AM, Marina [EMAIL PROTECTED] wrote: Hello, I need to know the rule name of the rule that fired in the consequence part of the rule. I tried something like the following, just trying to see if I can get it this way: package mode.simple; import java.lang.String; import java.util.List; import com.emptoris.ecm.domain.ContractRulesData; global java.util.Set approverList; rule testOR_1 dialect java when $data : ContractRulesData (sum 500 || name matches .*important) then approverList.add(approver3, approver4, Level5); ruleName = drools.getRule().getName(); System.out.println(ruleName + is TRUE); end When I'm trying to compile the rule, I'm getting the following error: Builder errors: Rule Compilation error : [Rule name=testOR_1, agendaGroup=MAIN, salience=0, no-loop=false] mode/simple/Rule_testOR_1_0.java (8:391) : ruleName cannot be resolved mode/simple/Rule_testOR_1_0.java (9:452) : ruleName cannot be resolved java.lang.RuntimeException: Unable to compile rules file: testOR_1.drl I must be doing something wrong here... ? thanks! Marina ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users -- Steven Williams Supervising Consultant Object Consulting Office: 8615 4500 Mob: 0439 898 668 Fax: 8615 4501 [EMAIL PROTECTED] www.objectconsulting.com.au consulting | development | training | support our experience makes the difference ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Feature request
Hi! I am also looking for the feature of being able to define constants in a rules file, that is mentioned in this thread (http://www.mail-archive.com/rules-users@lists.jboss.org/msg05142.html). Is this something that will be considered for a future release? I've been through the JIRA issues but could not find it :( Thanks, /Daniel ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
