[JBoss JIRA] Created: (JBRULES-1199) Add a field constraint negation operator to drools
by Arsalan Zaidi (JIRA)
Add a field constraint negation operator to drools
---------------------------------------------------
Key: JBRULES-1199
URL: http://jira.jboss.com/jira/browse/JBRULES-1199
Project: JBoss Rules
Issue Type: Feature Request
Security Level: Public (Everyone can see)
Reporter: Arsalan Zaidi
Assigned To: Mark Proctor
Arsalan,
Unfortunately Drools does not have a field constraint negation operator, mostly because when writing rules, it was not needed, since you can always negate the constraint itself.
Although, I understand a agree with your use case. My suggestion is for you to open a JIRA feature request and we will include that as soon as possible in the product.
Although, meanwhile, the only workaround I can see for your case is to translate the expression you are using directly into a java or mvel expression and write it inside an in-line eval.
[]s
Edson
2007/9/14, Arsalan S. Zaidi <arsalan.zaidi(a)capgemini.com>:
Hi
I'll try to explain the situation that Gaurav finds himself in. We're working on this problem together and so far, we haven't been able to crack it.
We're using drools to handle the business rules for an application. The rules however, are not provided to us in a .drl file, rather, we get an XLS sheet from the analysts with rules in a different grammar.
We're using ANTLR to read and parse these rules to generate the drools rules programmatically. However, we're running into problems with NOT.
The input rules (in the non-drools business language) have a NOT operator which works like '!' in Java. It flips the Boolean around, so to speak. So:
NOT((some sub expression which evaluates to TRUE)) == FALSE
MVEL doesn't seem to support this. So how do we simulate it?
If it were only being used with NOT IN, we could manage, but its use is completely arbitrary. Changes to the input rules or to the input rules grammar have been (ha ha) ruled out.
Any help would be appreciated.
Regards,
_____________________________________________________
Arsalan Zaidi / Capgemini - India (FS SBU) / Mumbai
Technical Architect
Mobile Phone: +91 - 9892 8970 03 / www.capgemini.com
Together: the Collaborative Business Experience
_____________________________________________________
--------------------------------------------------------------------------------
From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Anstis, Michael (M.)
Sent: 13 September 2007 13:31
To: Rules Users List
Subject: RE: [rules-users] How to use not operator in drool.
What dialect do your rules use?
You could also simplify the logic using DeMorgans Theorem (which might be troublesome to accomplish programmatically)
I don't know whether your example is flawed as the brackets don't match, but assuming you mean something like this:-
(NOT (G13.1 IN ("1","2","3") OR (G250.8 = Y)))
You can re-write this as
(G13.1NOT IN ("1","2","3") AND G250.8 != Y)
With kind regards,
Mike
--------------------------------------------------------------------------------
From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of JOSHI, GAURAV
Sent: 13 September 2007 08:20
To: Rules Users List
Subject: RE: [rules-users] How to use not operator in drool.
Thank's for your sugession of using "not in" instead of "not" but my problem is that "not" can also come without "in".
Actually I am making a generator of rule file from expression like
((NOT (ENDS WITH (G10.2, ",")))
((NOT (G13.1 IN ("1","2","3"))) OR (G250.8 = Y)))
Where G13.2, G250.8, G10.2 are variables coming from a map inserted in working memory.
I am accessing these variables from map.
My rules are as follows
This rule is working fine.
rule "Editable_G10.3"
when
((Map( this["G10.3"] !=8))||(Map( this["G10.2"] ==19)))
then
System.out.println("comming here----------------------------------------------------->");
End
This is not working
rule "Mandatory_G10.3"
when
(not((Map( this["G10.3"] !=8))||(Map( this["G10.2"] ==19))))
Then
System.out.println("comming here----------------------------------------------------->");
End
In also tried following approaches:
1) eval(not((Map( this["G10.3"] !=8))||(Map( this["G10.2"] ==19))))
2) eval(!((Map( this["G10.3"] !=8))||(Map( this["G10.2"] ==19))))
But in both cases it is giving same error:
org.drools.rule.InvalidRulePackage: Rule Compilation error : [Rule name=ValidationRuleExp_G10.3, agendaGroup=MAIN, salience=0, no-loop=false]
com/telekurs/nva/mde/fe/ak/validation/Rule_ValidationRuleExp_G10_3_0.java (11:495) : Cannot use this in a static context
com/telekurs/nva/mde/fe/ak/validation/Rule_ValidationRuleExp_G10_3_0.java (11:500) : Type mismatch: cannot convert from String to int
I am trying to find out some general concept so that I can change just achieve the functionality of not.
Thanks
Gaurav
--------------------------------------------------------------------------------
From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Edson Tirelli
Sent: Wednesday, September 12, 2007 10:20 PM
To: Rules Users List
Subject: Re: [rules-users] How to use not operator in drool.
Remove your "eval" and use "or" instead of "||" for the OR CE.
Although, I feel that this is not what you want... what you want is simply:
when
Map( this['city'] not in ( "mumbai", "delhi" ) )
then
//...
end
[]s
Edson
2007/9/12, Gaurav2007 < gaurav.a.joshi(a)capgemini.com>:
Hi ALL,
I am using drool4.0.1 in my application i am able to use IN,OR,AND operator
but i am facing problem in using not operator.
my requirement of not operator is just like a not gate.
the way i am using it is :
eval(not((Map( this["city"] !="mumbai"))||(Map( this["city"] =="delhi"))))
so can you please help me out to solve this problem:
should i use not operator or some thing else in drool.
Thanks,
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JBoss, a division of Red Hat @ www.jboss.com
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13 years, 7 months
[JBoss JIRA] Created: (JBRULES-1596) java.lang.NoClassDefFoundError
by Jurgen Van Bouchaute (JIRA)
java.lang.NoClassDefFoundError
-------------------------------
Key: JBRULES-1596
URL: http://jira.jboss.com/jira/browse/JBRULES-1596
Project: JBoss Drools
Issue Type: Bug
Security Level: Public (Everyone can see)
Affects Versions: 4.0.4
Environment: Win XP, Drools 4.0.4 , BRMS on JBOSS 4.2.1-GA , JVM Bea JRockit R27 3.1 (1.5)
Reporter: Jurgen Van Bouchaute
Assigned To: Mark Proctor
Attachments: adresDSL, packagesource.txt, Rule source.txt
Encountered following error during unit testing execution of rules :
[BeforeActivationFired: rule=Address Validation Town required; tuple=[fid:1:1:com.amadeus.mbo.msp.proto.model.AddressImpl@558fec]
]
java.lang.NoClassDefFoundError: Adres/CreateValidationErrorDSL
at ASMAccessorImpl_34195571209986950480.getValue(Unknown Source)
at org.mvel.ASTNode.getReducedValueAccelerated(ASTNode.java:174)
at org.mvel.ExecutableAccessor.getValue(ExecutableAccessor.java:50)
at ASMAccessorImpl_33632651209986950320.getValue(Unknown Source)
at org.mvel.ast.VariableDeepPropertyNode.getReducedValueAccelerated(VariableDeepPropertyNode.java:22)
at org.mvel.ast.PropertyASTNode.getReducedValueAccelerated(PropertyASTNode.java:21)
at org.mvel.MVELRuntime.execute(MVELRuntime.java:88)
at org.mvel.CompiledExpression.getValue(CompiledExpression.java:111)
at org.mvel.MVEL.executeExpression(MVEL.java:235)
at org.drools.base.mvel.MVELConsequence.evaluate(MVELConsequence.java:47)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:550)
at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:514)
at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:471)
at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:433)
at com.amadeus.mbo.commons.ruleengine.RuleManager.executeRules(RuleManager.java:158)
at com.amadeus.mbo.msp.proto.service.CustomerServiceImpl.validateAddress(CustomerServiceImpl.java:444)
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.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:296)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:177)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:144)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:107)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:166)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
at $Proxy8.validateAddress(Unknown Source)
at com.amadeus.mbo.msp.proto.service.CustomerServiceImplTest.testValidateAddress(CustomerServiceImplTest.java:1139)
DSL Rule RHS executes a function that returns an object which is inserted.
No problems when building & validating the package in BRMS, only when executing the rule.
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13 years, 7 months
[JBoss JIRA] Created: (JBRULES-1925) ClassCastException problem with reading working memory using ObjectInputStream
by Przemyslaw Rozycki (JIRA)
ClassCastException problem with reading working memory using ObjectInputStream
------------------------------------------------------------------------------
Key: JBRULES-1925
URL: https://jira.jboss.org/jira/browse/JBRULES-1925
Project: JBoss Drools
Issue Type: Bug
Security Level: Public (Everyone can see)
Affects Versions: 4.0.7
Environment: JDK 1.5.0_11
Reporter: Przemyslaw Rozycki
Assignee: Mark Proctor
I experienced the problem while reading WorkingMemory using ObjectInputStream.
Here is the code:
public class DroolsTest5 {
public static void main(String[] args) {
Properties props = new Properties();
props.setProperty("file", "<<place a path to any working DRL here>>");
RuleAgent ruleAgent = RuleAgent.newRuleAgent(props);
Fact fact1 = new Fact("a","b");
RuleBase ruleBase = ruleAgent.getRuleBase();
WorkingMemory baseWm = ruleBase.newStatefulSession(false);
baseWm.insert(fact1);
Iterator iter1 = baseWm.iterateObjects();
while (iter1.hasNext()) {
System.out.println(iter1.next());
}
System.out.println("=====");
try {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(baos);
oos.writeObject(baseWm);
oos.close();
byte[] buf = baos.toByteArray();
ByteArrayInputStream bais = new ByteArrayInputStream(buf);
ObjectInputStream ois = new ObjectInputStream(bais);
WorkingMemory wm = (WorkingMemory) ois.readObject();
Iterator iter2 = wm.iterateObjects();
while (iter2.hasNext()) {
System.out.println(iter2.next());
}
System.out.println("=====");
} catch (Exception e) {
e.printStackTrace();
}
}
public static class Fact implements Serializable {
String name;
String id;
public Fact(String _name, String _id) {
name = _name;
id = _id;
}
public String getId() {
return id;
}
public String getName() {
return name;
}
@Override
public String toString() {
return "Name: " + name + ", Id: " + id;
}
}
}
And here is an exception I get:
java.lang.ClassCastException: java.io.ObjectInputStream
at org.drools.reteoo.Rete$ClassObjectTypeConf.readObject(Rete.java:605)
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 java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:946)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1809)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1719)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1908)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1832)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1719)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1634)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
at org.drools.util.AbstractHashTable.readExternal(AbstractHashTable.java:66)
at org.drools.util.ObjectHashMap.readExternal(ObjectHashMap.java:41)
at java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1755)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1717)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1634)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299)
at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1634)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1908)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1832)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1719)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1908)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1832)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1719)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1908)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1832)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1719)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
at com.sample.DroolsTest5.main(DroolsTest5.java:52)
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13 years, 7 months
[JBoss JIRA] Created: (JBRULES-1996) NPE when using directory scanner and drl is incorrect.
by Przemyslaw Rozycki (JIRA)
NPE when using directory scanner and drl is incorrect.
------------------------------------------------------
Key: JBRULES-1996
URL: https://jira.jboss.org/jira/browse/JBRULES-1996
Project: JBoss Drools
Issue Type: Bug
Security Level: Public (Everyone can see)
Components: drools-core
Affects Versions: 4.0.7
Environment: Sun JDK 1.5.0_11, Kubuntu Linux 8.10, x86, 32-bit
Reporter: Przemyslaw Rozycki
Assignee: Mark Proctor
When I use rule agent with directory scanner, and the rule that is being scanned contains a bug, then I receive a NPE instead of error message:
java.lang.NullPointerException
at org.drools.agent.FileScanner.readPackage(FileScanner.java:102)
at org.drools.agent.FileScanner.getChangeSet(FileScanner.java:79)
at org.drools.agent.FileScanner.loadPackageChanges(FileScanner.java:57)
at org.drools.agent.DirectoryScanner.loadPackageChanges(DirectoryScanner.java:43)
at org.drools.agent.RuleAgent.checkForChanges(RuleAgent.java:330)
at org.drools.agent.RuleAgent.refreshRuleBase(RuleAgent.java:298)
at org.drools.agent.RuleAgent.configure(RuleAgent.java:284)
at org.drools.agent.RuleAgent.init(RuleAgent.java:208)
at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:176)
at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:164)
... (further entries of stack trace contains my application's lines)
When I looked into code I found that DirectoryScanner object, used by the agent uses FileScanner object to scan each file in a directory. And the file scanner does not have a listener set. That's why the NPE is thrown.
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13 years, 7 months