Re: [rules-users] Drools all lhs execute before all the rhs, i want to run sequentially
It seems to me that you should write this as a plain old if/then/else/if... in Java (or any other language). Or is there something else in the way Drools evaluates rules over facts in working memory that makes it highly desirable to use rules? This has been asked before, and more often than not there was a way to avoid a way of establishing the sequence of RHS execution by salience or whatever. So, if you do need rules, you can assign decreasing salience values to all your rules. To terminate, either call the engine's halt() method, or retract the fact(s) triggering the rules. But note that all conditions will be evaluated before the first RHS is executed. To aoid this: see the 1st sentence. -W On 26 September 2011 06:54, Saurabh Pandey meet.saurabhpan...@gmail.comwrote: In drools rules, all the LHS ie when conditions are executed at the start, then all there subsequent rhs ie then part executes, In my project i want to run it as a simple if-else i.e When ... Then do. When ... Then do.. if this when is false then only go to the next when, and if its true then execute its then and then move ahead to the other when. i tried agenda-group, activation-group but these are not working for me. Can some one plz help me! -- View this message in context: http://drools.46999.n3.nabble.com/Drools-all-lhs-execute-before-all-the-rhs-i-want-to-run-sequentially-tp3368215p3368215.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
Re: [rules-users] Drools all lhs execute before all the rhs, i want to run sequentially
Thanks for ur suggestion! I just wanted to keep the business logic in separate drools layer. -- View this message in context: http://drools.46999.n3.nabble.com/Drools-all-lhs-execute-before-all-the-rhs-i-want-to-run-sequentially-tp3368215p3368412.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
Re: [rules-users] Drools all lhs execute before all the rhs, i want to run sequentially
@Nguy I tried salience but it just orders the execution of when part, but still all when execute before the then parts -- View this message in context: http://drools.46999.n3.nabble.com/Drools-all-lhs-execute-before-all-the-rhs-i-want-to-run-sequentially-tp3368215p3368415.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
Re: [rules-users] Drools all lhs execute before all the rhs, i want to run sequentially
take a simple scenario: when condition1 condition2 then ... Does the condition2 gets executed even if the condition1 is false, normally it should not because the conditions in the when are actually combined with an AND. Has anywhen tried this?? -- View this message in context: http://drools.46999.n3.nabble.com/Drools-all-lhs-execute-before-all-the-rhs-i-want-to-run-sequentially-tp3368215p3368464.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
Re: [rules-users] Drools all lhs execute before all the rhs, i want to run sequentially
This isn't an if statement evaluated left to right with an between each part. Drools uses the rete algorithm to make execution more efficient. Put very simply (and probably inaccurately) Rete creates an evaluation tree where inputs are put in the top and activations come out the end. In this case the tree would have: One node that evaluated condition1, this node outputs a list of all the facts that matches it. A node for condition 2 which outputs a list all the facts that match that condition. A node for the rule, this takes the outputs of the other two nodes and produces an activation for each pair of items (assuming condition 1 and 2 aren't related). If you had another rule with condition1 and condition3 then they would both share the first node greatly improving efficiency and re-evaluation time. Thomas -Original Message- From: rules-users-boun...@lists.jboss.org [mailto:rules-users- boun...@lists.jboss.org] On Behalf Of Saurabh Pandey Sent: 26 September 2011 08:15 To: rules-users@lists.jboss.org Subject: Re: [rules-users] Drools all lhs execute before all the rhs, i want to run sequentially take a simple scenario: when condition1 condition2 then ... Does the condition2 gets executed even if the condition1 is false, normally it should not because the conditions in the when are actually combined with an AND. Has anywhen tried this?? -- View this message in context: http://drools.46999.n3.nabble.com/Drools-all- lhs-execute-before-all-the-rhs-i-want-to-run-sequentially- tp3368215p3368464.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 ** This message is confidential and intended only for the addressee. If you have received this message in error, please immediately notify the postmas...@nds.com and delete it from your system as well as any copies. The content of e-mails as well as traffic data may be monitored by NDS for employment and security purposes. To protect the environment please do not print this e-mail unless necessary. NDS Limited. Registered Office: One London Road, Staines, Middlesex, TW18 4EX, United Kingdom. A company registered in England and Wales. Registered no. 3080780. VAT no. GB 603 8808 40-00 ** ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Drools all lhs execute before all the rhs, i want to run sequentially
You missed the second part of the instructions - once a rule has matched you need to make sure the other rules don't match. This can be achieved in multiple ways: Call the engines halt method - just stop evaluation. Retract the facts - then nothing else can match it. Update the facts to stop the condition from being matched - eg add a processed field and make the rules match only if processed is false. Insert a new fact and modify your rules to only run if that fact doesn't exist - eg add not YourResultObject() to the when's and insert(new YourResultObject()); to the thens. Thomas -Original Message- From: rules-users-boun...@lists.jboss.org [mailto:rules-users- boun...@lists.jboss.org] On Behalf Of Saurabh Pandey Sent: 26 September 2011 07:49 To: rules-users@lists.jboss.org Subject: Re: [rules-users] Drools all lhs execute before all the rhs, i want to run sequentially @Nguy I tried salience but it just orders the execution of when part, but still all when execute before the then parts -- View this message in context: http://drools.46999.n3.nabble.com/Drools-all- lhs-execute-before-all-the-rhs-i-want-to-run-sequentially- tp3368215p3368415.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 ** This message is confidential and intended only for the addressee. If you have received this message in error, please immediately notify the postmas...@nds.com and delete it from your system as well as any copies. The content of e-mails as well as traffic data may be monitored by NDS for employment and security purposes. To protect the environment please do not print this e-mail unless necessary. NDS Limited. Registered Office: One London Road, Staines, Middlesex, TW18 4EX, United Kingdom. A company registered in England and Wales. Registered no. 3080780. VAT no. GB 603 8808 40-00 ** ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] Weird human task behaviour
I have this strange problem, when I call
int taskId = 105; // dummy taskId, the real one is obtained
through TaskSummary
BlockingTaskOperationResponseHandler b = new
BlockingTaskOperationResponseHandler();
client.complete(taskId, myusername, null, b);
while (!b.isDone()){
b.waitTillDone(100);
}
System.out.println(Completed task +taskId+ owned by user
myusername.);
I get this in the log:
INFO [STDOUT] Completed task 105 owned by user myusername.
INFO [STDOUT] Notification of completed task 104
...and about 50 milliseconds later...
INFO [STDOUT] Notification of aborted task 104
No error messages between these two notifications.
I understand that these ID's are not the same because 104 is actually
workItemId that holds taskId 105.
The status of task 105 in the database table task is Completed, but the
workflow stops after it and I can't do anything about it.
Is there any known issues with task persistence in JBoss 5.1 or something?
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Re: [rules-users] Weird human task behaviour
Ah, I forgot to mention that I'm using Drools 5.2.0 Final and jbpm 5.1.0 Final. -- View this message in context: http://drools.46999.n3.nabble.com/Weird-human-task-behaviour-tp3368608p3368638.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
Re: [rules-users] Drools all lhs execute before all the rhs, i want to run sequentially
these are my rules:
rule Rule 03
salience 10
when
$info : RuleRunner()
eval(RuleRunner.check())
eval(RuleRunner.setIt())
then
System.out.println(3**);
$info.printResult(1);
end
rule Rule 04
salience 8
when
$info : RuleRunner()
eval(RuleRunner.check())
then
System.out.println(4**);
$info.printResult(2);
end
these are my java methods:
static boolean cvar = true;
public void printResult(int i){
System.out.println(i);
}
public static boolean check(){
System.out.println(check**);
return cvar;
}
public static boolean setIt(){
cvar = false;
return true;
}
this is how i am invoking the rules:
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
kbuilder.add(ResourceFactory.newFileResource(rule03.drl),
ResourceType.DRL );
if ( kbuilder.hasErrors() ) {
System.err.println( kbuilder.getErrors().toString() );
}
KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
kbase.addKnowledgePackages( kbuilder.getKnowledgePackages() );
StatelessKnowledgeSession ksession =
kbase.newStatelessKnowledgeSession();
ksession.execute(new RuleRunner());
This is the output:
check**
3**
1
4**
2
Why is check printing only once though its called 2 times in 2 rules, and
when cvar is false then also 2nd rule's then part is executing?
Is it that static methods of same name are called once and there result is
stored and used in all rules??
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Re: [rules-users] Drools all lhs execute before all the rhs, i want to run sequentially
Have you read the expert guide?
http://docs.jboss.org/drools/release/5.2.0.Final/drools-expert-docs/html_single/index.html
- At least up to the end of chapter 4.
Why are you using static fields and methods?
You are changing the value of objects in the when condition which is really
really really bad and it's no wonder nothing is working like you are expecting.
The fact that you are using eval's is a good indication that your code is
written wrong, for simple rules you never need to use it.
Thomas
-Original Message-
From: rules-users-boun...@lists.jboss.org [mailto:rules-users-
boun...@lists.jboss.org] On Behalf Of Saurabh Pandey
Sent: 26 September 2011 11:22
To: rules-users@lists.jboss.org
Subject: Re: [rules-users] Drools all lhs execute before all the rhs, i want
to
run sequentially
these are my rules:
rule Rule 03
salience 10
when
$info : RuleRunner()
eval(RuleRunner.check())
eval(RuleRunner.setIt())
then
System.out.println(3**);
$info.printResult(1);
end
rule Rule 04
salience 8
when
$info : RuleRunner()
eval(RuleRunner.check())
then
System.out.println(4**);
$info.printResult(2);
end
these are my java methods:
static boolean cvar = true;
public void printResult(int i){
System.out.println(i);
}
public static boolean check(){
System.out.println(check**);
return cvar;
}
public static boolean setIt(){
cvar = false;
return true;
}
this is how i am invoking the rules:
KnowledgeBuilder kbuilder =
KnowledgeBuilderFactory.newKnowledgeBuilder();
kbuilder.add(ResourceFactory.newFileResource(rule03.drl),
ResourceType.DRL );
if ( kbuilder.hasErrors() ) {
System.err.println( kbuilder.getErrors().toString() );
}
KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
kbase.addKnowledgePackages( kbuilder.getKnowledgePackages() );
StatelessKnowledgeSession ksession =
kbase.newStatelessKnowledgeSession();
ksession.execute(new RuleRunner());
This is the output:
check**
3**
1
4**
2
Why is check printing only once though its called 2 times in 2 rules, and when
cvar is false then also 2nd rule's then part is executing?
Is it that static methods of same name are called once and there result is
stored and used in all rules??
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lhs-execute-before-all-the-rhs-i-want-to-run-sequentially-
tp3368215p3368864.html
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Re: [rules-users] Drools all lhs execute before all the rhs, i want to run sequentially
@thomas thanks for your comments I am new to drools, can u plz give me an alternative to the above code. -- View this message in context: http://drools.46999.n3.nabble.com/Drools-all-lhs-execute-before-all-the-rhs-i-want-to-run-sequentially-tp3368215p3368917.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
Re: [rules-users] Drools all lhs execute before all the rhs, i want to run sequentially
Saurabh Pandey wrote: @Nguy I tried salience but it just orders the execution of when part, but still all when execute before the then parts Hi, it seems to me that you are using the wrong tool to solve your problem. Drools is a rule-based execution engine (among other things) not a glorified if-then-else-if executor. I'd suggest you consult the Drools manual (site is off at the moment). At the beggining there is a nice section about when you could benefit from a Drools-like approach or not. If you still think that Drools is best suited for your needs, you need to rethink your approach. I would not suggest using salience as this could be mistaked as a way to force procedural logic on a system(Drools) that is inherently not so. -Stathis -- View this message in context: http://drools.46999.n3.nabble.com/Drools-all-lhs-execute-before-all-the-rhs-i-want-to-run-sequentially-tp3368215p3368415.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
Re: [rules-users] Drools all lhs execute before all the rhs, i want to run sequentially
As I said, try reading the expert doc, there's some examples in there which you can base your code on. Once you've done that or if you have any questions about the samples/what the documentation means then post them and we'd be pleased to help, but the first step is to structure your code correctly using objects that follow the bean conventions and rules structured correctly with conditions against objects and appropriate modify statements. Thomas -Original Message- From: rules-users-boun...@lists.jboss.org [mailto:rules-users- boun...@lists.jboss.org] On Behalf Of Saurabh Pandey Sent: 26 September 2011 11:51 To: rules-users@lists.jboss.org Subject: Re: [rules-users] Drools all lhs execute before all the rhs, i want to run sequentially @thomas thanks for your comments I am new to drools, can u plz give me an alternative to the above code. -- View this message in context: http://drools.46999.n3.nabble.com/Drools-all- lhs-execute-before-all-the-rhs-i-want-to-run-sequentially- tp3368215p3368917.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 ** This message is confidential and intended only for the addressee. If you have received this message in error, please immediately notify the postmas...@nds.com and delete it from your system as well as any copies. The content of e-mails as well as traffic data may be monitored by NDS for employment and security purposes. To protect the environment please do not print this e-mail unless necessary. NDS Limited. Registered Office: One London Road, Staines, Middlesex, TW18 4EX, United Kingdom. A company registered in England and Wales. Registered no. 3080780. VAT no. GB 603 8808 40-00 ** ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Drools all lhs execute before all the rhs, i want to run sequentially
Hi, If you have a lot of rules like it you might be able to use the jBPM (what what the Drools Flow) to help with this. Otherwise plan old java might be easier... Wendy From: Swindells, Thomas tswinde...@nds.com To: Rules Users List rules-users@lists.jboss.org Sent: Monday, September 26, 2011 6:53 AM Subject: Re: [rules-users] Drools all lhs execute before all the rhs, i want to run sequentially As I said, try reading the expert doc, there's some examples in there which you can base your code on. Once you've done that or if you have any questions about the samples/what the documentation means then post them and we'd be pleased to help, but the first step is to structure your code correctly using objects that follow the bean conventions and rules structured correctly with conditions against objects and appropriate modify statements. Thomas -Original Message- From: rules-users-boun...@lists.jboss.org [mailto:rules-users- boun...@lists.jboss.org] On Behalf Of Saurabh Pandey Sent: 26 September 2011 11:51 To: rules-users@lists.jboss.org Subject: Re: [rules-users] Drools all lhs execute before all the rhs, i want to run sequentially @thomas thanks for your comments I am new to drools, can u plz give me an alternative to the above code. -- View this message in context: http://drools.46999.n3.nabble.com/Drools-all- lhs-execute-before-all-the-rhs-i-want-to-run-sequentially- tp3368215p3368917.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 ** This message is confidential and intended only for the addressee. If you have received this message in error, please immediately notify the postmas...@nds.com and delete it from your system as well as any copies. The content of e-mails as well as traffic data may be monitored by NDS for employment and security purposes. To protect the environment please do not print this e-mail unless necessary. NDS Limited. Registered Office: One London Road, Staines, Middlesex, TW18 4EX, United Kingdom. A company registered in England and Wales. Registered no. 3080780. VAT no. GB 603 8808 40-00 ** ___ 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] Regression with Drools 5.3.0-CR1
I've just tried upgrading from Drools 5.3.0-CR1 from the beta and I've hit a
regression.
JBoss seems to have been down for most of today so I haven't been able to raise
a Jira for it.
In our model we have Facts which contain fields of java.lang.class, we then
have a rule which checks that they aren't null.
Eg
Fact { ClassObject classField}
Rule xyz
When
Fact(classField != null)
Then
...
End
This is giving the following exception
Caused by: java.lang.ClassCastException: org.drools.base.field.ObjectFieldImpl
cannot be cast to org.drools.base.field.ClassFieldImpl
at
org.drools.base.evaluators.EqualityEvaluatorsDefinition$ClassEqualEvaluator.evaluate(EqualityEvaluatorsDefinition.java:1772)
at
org.drools.rule.LiteralRestriction.isAllowed(LiteralRestriction.java:87)
at
org.drools.rule.LiteralConstraint.isAllowed(LiteralConstraint.java:109)
at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:130)
at
org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:451)
at
org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:369)
at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:134)
at
org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:451)
at
org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:379)
at
org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:204)
at
org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:244)
at
org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:330)
at
org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:291)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:882)
at
org.drools.base.DefaultKnowledgeHelper.insert(DefaultKnowledgeHelper.java:180)
... 149 more
Wrapping the classField != null within an eval appears to be a work around.
This is in the suspect method:
public boolean evaluate(InternalWorkingMemory workingMemory,
final InternalReadAccessor extractor,
final Object object1, final FieldValue object2)
{
Object value1 = extractor.getValue( workingMemory, object1 );
Object value2 = object2.getValue();
if ( value2 == null ) {
ClassFieldImpl classField = (ClassFieldImpl) object2;
value2 = classField.resolve( workingMemory );
}
return comparator.equals( value1, value2 );
}
I think the if statement just needs an instanceof check as well or some other
way to track the fact that null may be a valid value to be comparing with!
Thomas
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Re: [rules-users] Regression with Drools 5.3.0-CR1
That's a nice one.. We will definitely create a test for that.. if it's not
there..
2011/9/26 Swindells, Thomas tswinde...@nds.com
I’ve just tried upgrading from Drools 5.3.0-CR1 from the beta and I’ve
hit a regression.
** **
JBoss seems to have been down for most of today so I haven’t been able to
raise a Jira for it.
** **
In our model we have Facts which contain fields of java.lang.class, we then
have a rule which checks that they aren’t null.
Eg
Fact { ClassObject classField}
** **
Rule “xyz”
When
Fact(classField != null)
Then
…
End
** **
This is giving the following exception
** **
Caused by: java.lang.ClassCastException:
org.drools.base.field.ObjectFieldImpl cannot be cast to
org.drools.base.field.ClassFieldImpl
at
org.drools.base.evaluators.EqualityEvaluatorsDefinition$ClassEqualEvaluator.evaluate(EqualityEvaluatorsDefinition.java:1772)
at
org.drools.rule.LiteralRestriction.isAllowed(LiteralRestriction.java:87)**
**
at
org.drools.rule.LiteralConstraint.isAllowed(LiteralConstraint.java:109)***
*
at
org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:130)
at
org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:451)
at
org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:369)
at
org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:134)
at
org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:451)
at
org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:379)
at
org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:204)
at
org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:244)
at
org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:330)
at
org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:291)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:882)
at
org.drools.base.DefaultKnowledgeHelper.insert(DefaultKnowledgeHelper.java:180)
... 149 more
** **
Wrapping the classField != null within an eval appears to be a work around.
** **
This is in the suspect method:
*public* *boolean* evaluate(InternalWorkingMemory workingMemory,**
**
*final* InternalReadAccessor extractor,***
*
*final* Object object1, *final* FieldValue
object2) {
Object value1 = extractor.getValue( workingMemory, object1 );*
***
Object value2 = object2.getValue();
*if* ( value2 == *null* ) {
ClassFieldImpl classField = (ClassFieldImpl) object2;
value2 = classField.resolve( workingMemory );
}
*return* *comparator*.equals( value1, value2 );
}
** **
I think the if statement just needs an instanceof check as well or some
other way to track the fact that null may be a valid value to be comparing
with!
** **
** **
Thomas
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Re: [rules-users] How to terminate a StatefulKnowledgeSession
Thanks for your suggestion about activating the console logger. That helped me find out what's going on. After I fixed a stupid logic error on my part, I found out that my basic solution will work. When the user decides to cancel the session, I need to make sure that the current rule's RHS processing completes. Then, my stop rule will fire and clear the agenda, and fireAllRules() will finish normally. -- View this message in context: http://drools.46999.n3.nabble.com/How-to-terminate-a-StatefulKnowledgeSession-tp3355958p3370067.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
Re: [rules-users] Regression with Drools 5.3.0-CR1
Thomas,
Thanks for reporting. I will look into it.
Did you open a JIRA yet? Let me know or I will do it otherwise.
Edson
2011/9/26 Swindells, Thomas tswinde...@nds.com
I’ve just tried upgrading from Drools 5.3.0-CR1 from the beta and I’ve
hit a regression.
** **
JBoss seems to have been down for most of today so I haven’t been able to
raise a Jira for it.
** **
In our model we have Facts which contain fields of java.lang.class, we then
have a rule which checks that they aren’t null.
Eg
Fact { ClassObject classField}
** **
Rule “xyz”
When
Fact(classField != null)
Then
…
End
** **
This is giving the following exception
** **
Caused by: java.lang.ClassCastException:
org.drools.base.field.ObjectFieldImpl cannot be cast to
org.drools.base.field.ClassFieldImpl
at
org.drools.base.evaluators.EqualityEvaluatorsDefinition$ClassEqualEvaluator.evaluate(EqualityEvaluatorsDefinition.java:1772)
at
org.drools.rule.LiteralRestriction.isAllowed(LiteralRestriction.java:87)**
**
at
org.drools.rule.LiteralConstraint.isAllowed(LiteralConstraint.java:109)***
*
at
org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:130)
at
org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:451)
at
org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:369)
at
org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:134)
at
org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:451)
at
org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:379)
at
org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:204)
at
org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:244)
at
org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:330)
at
org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:291)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:882)
at
org.drools.base.DefaultKnowledgeHelper.insert(DefaultKnowledgeHelper.java:180)
... 149 more
** **
Wrapping the classField != null within an eval appears to be a work around.
** **
This is in the suspect method:
*public* *boolean* evaluate(InternalWorkingMemory workingMemory,**
**
*final* InternalReadAccessor extractor,***
*
*final* Object object1, *final* FieldValue
object2) {
Object value1 = extractor.getValue( workingMemory, object1 );*
***
Object value2 = object2.getValue();
*if* ( value2 == *null* ) {
ClassFieldImpl classField = (ClassFieldImpl) object2;
value2 = classField.resolve( workingMemory );
}
*return* *comparator*.equals( value1, value2 );
}
** **
I think the if statement just needs an instanceof check as well or some
other way to track the fact that null may be a valid value to be comparing
with!
** **
** **
Thomas
--
**
This message is confidential and intended only for the addressee. If you
have received this message in error, please immediately notify the
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The content of e-mails as well as traffic data may be monitored by NDS for
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JBoss Drools Core Development
JBoss by Red Hat @ www.jboss.com
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Re: [rules-users] Regression with Drools 5.3.0-CR1
Note that https://issues.jboss.org/browse/JBRULES-2995 reported
against 5.2.0.CR1
and still open might be related.
-W
2011/9/26 Edson Tirelli ed.tire...@gmail.com
Thomas,
Thanks for reporting. I will look into it.
Did you open a JIRA yet? Let me know or I will do it otherwise.
Edson
2011/9/26 Swindells, Thomas tswinde...@nds.com
I’ve just tried upgrading from Drools 5.3.0-CR1 from the beta and I’ve
hit a regression.
** **
JBoss seems to have been down for most of today so I haven’t been able to
raise a Jira for it.
** **
In our model we have Facts which contain fields of java.lang.class, we
then have a rule which checks that they aren’t null.
Eg
Fact { ClassObject classField}
** **
Rule “xyz”
When
Fact(classField != null)
Then
…
End
** **
This is giving the following exception
** **
Caused by: java.lang.ClassCastException:
org.drools.base.field.ObjectFieldImpl cannot be cast to
org.drools.base.field.ClassFieldImpl
at
org.drools.base.evaluators.EqualityEvaluatorsDefinition$ClassEqualEvaluator.evaluate(EqualityEvaluatorsDefinition.java:1772)
at
org.drools.rule.LiteralRestriction.isAllowed(LiteralRestriction.java:87)*
***
at
org.drools.rule.LiteralConstraint.isAllowed(LiteralConstraint.java:109)**
**
at
org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:130)
at
org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:451)
at
org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:369)
at
org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:134)
at
org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:451)
at
org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:379)
at
org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:204)***
*
at
org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:244)***
*
at
org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:330)
at
org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:291)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:882)
at
org.drools.base.DefaultKnowledgeHelper.insert(DefaultKnowledgeHelper.java:180)
... 149 more
** **
Wrapping the classField != null within an eval appears to be a work
around.
** **
This is in the suspect method:
*public* *boolean* evaluate(InternalWorkingMemory workingMemory,*
***
*final* InternalReadAccessor extractor,**
**
*final* Object object1, *final*FieldValue
object2) {
Object value1 = extractor.getValue( workingMemory, object1 );
Object value2 = object2.getValue();
*if* ( value2 == *null* ) {
ClassFieldImpl classField = (ClassFieldImpl) object2;
value2 = classField.resolve( workingMemory );
}
*return* *comparator*.equals( value1, value2 );
}
** **
I think the if statement just needs an instanceof check as well or some
other way to track the fact that null may be a valid value to be comparing
with!
** **
** **
Thomas
--
**
This message is confidential and intended only for the addressee. If you
have received this message in error, please immediately notify the
postmas...@nds.com and delete it from your system as well as any copies.
The content of e-mails as well as traffic data may be monitored by NDS for
employment and security purposes. To protect the environment please do not
print this e-mail unless necessary.
NDS Limited. Registered Office: One London Road, Staines, Middlesex, TW18
4EX, United Kingdom. A company registered in England and Wales. Registered
no. 3080780. VAT no. GB 603 8808 40-00
**
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JBoss Drools Core Development
JBoss by Red Hat @ www.jboss.com
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Re: [rules-users] Regression with Drools 5.3.0-CR1
Thanks Wolfgang. That is a different issue related to how MVEL deals with
class literals. I will check what's the status on it anyway.
Edson
2011/9/26 Wolfgang Laun wolfgang.l...@gmail.com
Note that https://issues.jboss.org/browse/JBRULES-2995 reported against
5.2.0.CR1
and still open might be related.
-W
2011/9/26 Edson Tirelli ed.tire...@gmail.com
Thomas,
Thanks for reporting. I will look into it.
Did you open a JIRA yet? Let me know or I will do it otherwise.
Edson
2011/9/26 Swindells, Thomas tswinde...@nds.com
I’ve just tried upgrading from Drools 5.3.0-CR1 from the beta and I’ve
hit a regression.
** **
JBoss seems to have been down for most of today so I haven’t been able to
raise a Jira for it.
** **
In our model we have Facts which contain fields of java.lang.class, we
then have a rule which checks that they aren’t null.
Eg
Fact { ClassObject classField}
** **
Rule “xyz”
When
Fact(classField != null)
Then
…
End
** **
This is giving the following exception
** **
Caused by: java.lang.ClassCastException:
org.drools.base.field.ObjectFieldImpl cannot be cast to
org.drools.base.field.ClassFieldImpl
at
org.drools.base.evaluators.EqualityEvaluatorsDefinition$ClassEqualEvaluator.evaluate(EqualityEvaluatorsDefinition.java:1772)
at
org.drools.rule.LiteralRestriction.isAllowed(LiteralRestriction.java:87)
at
org.drools.rule.LiteralConstraint.isAllowed(LiteralConstraint.java:109)*
***
at
org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:130)
at
org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:451)
at
org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:369)
at
org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:134)
at
org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:451)
at
org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:379)
at
org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:204)**
**
at
org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:244)**
**
at
org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:330)
at
org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:291)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:882)
at
org.drools.base.DefaultKnowledgeHelper.insert(DefaultKnowledgeHelper.java:180)
... 149 more
** **
Wrapping the classField != null within an eval appears to be a work
around.
** **
This is in the suspect method:
*public* *boolean* evaluate(InternalWorkingMemory workingMemory,
*final* InternalReadAccessor extractor,*
***
*final* Object object1, *final*FieldValue
object2) {
Object value1 = extractor.getValue( workingMemory, object1 );
Object value2 = object2.getValue();
*if* ( value2 == *null* ) {
ClassFieldImpl classField = (ClassFieldImpl) object2;***
*
value2 = classField.resolve( workingMemory );
}
*return* *comparator*.equals( value1, value2 );
}
** **
I think the if statement just needs an instanceof check as well or some
other way to track the fact that null may be a valid value to be comparing
with!
** **
** **
Thomas
--
**
This message is confidential and intended only for the addressee. If you
have received this message in error, please immediately notify the
postmas...@nds.com and delete it from your system as well as any copies.
The content of e-mails as well as traffic data may be monitored by NDS for
employment and security purposes. To protect the environment please do not
print this e-mail unless necessary.
NDS Limited. Registered Office: One London Road, Staines, Middlesex, TW18
4EX, United Kingdom. A company registered in England and Wales. Registered
no. 3080780. VAT no. GB 603 8808 40-00
**
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--
Edson Tirelli
JBoss Drools Core
Re: [rules-users] Regression with Drools 5.3.0-CR1
Ok, this is fixed:
https://issues.jboss.org/browse/JBRULES-3224
I will check JBRULES-2995 now.
Edson
2011/9/26 Edson Tirelli ed.tire...@gmail.com
Thanks Wolfgang. That is a different issue related to how MVEL deals
with class literals. I will check what's the status on it anyway.
Edson
2011/9/26 Wolfgang Laun wolfgang.l...@gmail.com
Note that https://issues.jboss.org/browse/JBRULES-2995 reported against
5.2.0.CR1
and still open might be related.
-W
2011/9/26 Edson Tirelli ed.tire...@gmail.com
Thomas,
Thanks for reporting. I will look into it.
Did you open a JIRA yet? Let me know or I will do it otherwise.
Edson
2011/9/26 Swindells, Thomas tswinde...@nds.com
I’ve just tried upgrading from Drools 5.3.0-CR1 from the beta and I’ve
hit a regression.
** **
JBoss seems to have been down for most of today so I haven’t been able
to raise a Jira for it.
** **
In our model we have Facts which contain fields of java.lang.class, we
then have a rule which checks that they aren’t null.
Eg
Fact { ClassObject classField}
** **
Rule “xyz”
When
Fact(classField != null)
Then
…
End
** **
This is giving the following exception
** **
Caused by: java.lang.ClassCastException:
org.drools.base.field.ObjectFieldImpl cannot be cast to
org.drools.base.field.ClassFieldImpl
at
org.drools.base.evaluators.EqualityEvaluatorsDefinition$ClassEqualEvaluator.evaluate(EqualityEvaluatorsDefinition.java:1772)
at
org.drools.rule.LiteralRestriction.isAllowed(LiteralRestriction.java:87)
at
org.drools.rule.LiteralConstraint.isAllowed(LiteralConstraint.java:109)
at
org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:130)
at
org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:451)
at
org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:369)
at
org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:134)
at
org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:451)
at
org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:379)
at
org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:204)*
***
at
org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:244)*
***
at
org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:330)
at
org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:291)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:882)
at
org.drools.base.DefaultKnowledgeHelper.insert(DefaultKnowledgeHelper.java:180)
... 149 more
** **
Wrapping the classField != null within an eval appears to be a work
around.
** **
This is in the suspect method:
*public* *boolean* evaluate(InternalWorkingMemory
workingMemory,
*final* InternalReadAccessor extractor,
*final* Object object1, *final*FieldValue
object2) {
Object value1 = extractor.getValue( workingMemory, object1
);
Object value2 = object2.getValue();
*if* ( value2 == *null* ) {
ClassFieldImpl classField = (ClassFieldImpl) object2;**
**
value2 = classField.resolve( workingMemory );
}
*return* *comparator*.equals( value1, value2 );
}
** **
I think the if statement just needs an instanceof check as well or some
other way to track the fact that null may be a valid value to be comparing
with!
** **
** **
Thomas
--
**
This message is confidential and intended only for the addressee. If you
have received this message in error, please immediately notify the
postmas...@nds.com and delete it from your system as well as any
copies. The content of e-mails as well as traffic data may be monitored by
NDS for employment and security purposes. To protect the environment please
do not print this e-mail unless necessary.
NDS Limited. Registered Office: One London Road, Staines, Middlesex,
TW18 4EX, United Kingdom. A company registered in England and Wales.
Registered no. 3080780. VAT no. GB 603 8808 40-00
**
[rules-users] Maven Drools Plugin needs proper de-serialization support from DroolsStreamUtils
Hi all, I think I've found a bug in DroolsStreamUtils. It does not allow to deserialize a collection of KnowledgePackages with dependencies between the packages. In this case, it fails with ClassNotFoundException. Example: Package A contains a type declaration, package B contains a rule using this declaration. Compilation and serialization works fine, but deserialization fails (complains that it cannot find declared type). As it seems, the deserialization code does not consider classes resulting from declared types when resolving type references. This is true for Drools 5.2.0.Final, 5.3.0.CR1 and 5.3.0.Beta1. It works fine for 5.1.1. I was so bold to create a JIRA ticket for this problem right away: https://issues.jboss.org/browse/JBRULES-3225 (with unit tests attached). The functionality provided by class DroolsStreamUtils is essential for the Maven Drools Plugin (compiler needs to serialize stuff, which then needs to be *de-serializable* by applications). If anyone is interested in using the upcoming Maven Drools Plugin to compile rule source code into binary package files and *load* theses packages from your application, please *vote* for this JIRA ticket, as the maven plugin *must* rely on serialization functionality *provided by drools* (a re-implementation is certainly out of scope and would be more than prone to incompatibility). Without a fix or at least a workaround for this bug, the maven plugin will only be able to work with Drools 5.1.1 (newer versions are broken, older versions did not include DroolsStreamUtils at all AFAIK). Thanks in advance, to everyone who will contribute to a potential solution or workaround. Best regards Ansgar ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] Unsatisfied rule fires - Drools bug?
Hi,
I am working with Drools to implement a high-profile rules-engine. I have
two rules defined. Clearly, only the first should fire, but both do. Here is
my DRL:
package com.sample
import com.sample.DroolsTest.Request;
rule ExpensiveCanonShopper0
when
Request( attributeMap[camera0] == canon
attributeMap[price0] = 500 )
then
System.out.println(ExpensiveCanonShopper0);
end
rule ExpensiveCanonShopper1
when
Request( attributeMap[camera1] == canon
attributeMap[price1] = 500 )
then
System.out.println(ExpensiveCanonShopper1);
end
And the Java class to execute it:
public class DroolsTest {
@SuppressWarnings({ rawtypes, unchecked })
public static final void main(String[] args) {
try {
//Loading the Rules
System.out.println(Loading rules);
RuleBase ruleBase = readRule();
StatelessSession workingMemory =
ruleBase.newStatelessSession();
System.out.println(Firing rules);
Map map = new HashMap();
map.put(camera0, canon);
map.put(price0, 600);
Request request = new Request();
request.setAttributeMap(map);
workingMemory.execute(request);
} catch (Throwable t) {
t.printStackTrace();
}
}
/**
* Please note that this is the “low level” rule assembly API.
*/
private static RuleBase readRule() throws Exception {
//read in the source
Reader source = new FileReader(new File(drl,
Generated.drl));
//optionally read in the DSL (if you are using it).
//Reader dsl = new InputStreamReader(
DroolsTest.class.getResourceAsStream( “/mylang.dsl” ) );
//Use package builder to build up a rule package.
//An alternative lower level class called “DrlParser” can
also be used…
PackageBuilder builder = new PackageBuilder();
//this wil parse and compile in one step
//NOTE: There are 2 methods here, the one argument one is
for normal DRL.
builder.addPackageFromDrl( source );
if (builder.hasErrors()) {
PackageBuilderErrors errors = builder.getErrors();
throw new RuntimeException(Error adding package to
builder: + errors.toString());
}
//Use the following instead of above if you are using a DSL:
//builder.addPackageFromDrl( source, dsl );
//get the compiled package (which is serializable)
Package pkg = builder.getPackage();
//add the package to a rulebase (deploy the rule package).
RuleBase ruleBase = RuleBaseFactory.newRuleBase();
ruleBase.addPackage( pkg );
return ruleBase;
}
public static class Request {
private Map attributeMap;
public Map getAttributeMap() {
return attributeMap;
}
public void setAttributeMap(Map attributeMap) {
this.attributeMap = attributeMap;
}
}
}
The output is this, meaning both rules fired:
Loading rules
Firing rules
ExpensiveCanonShopper1
ExpensiveCanonShopper0
I have two questions:
1. Is this a bug, or am I doing something wrong? Only
ExpensiveCanonShopper0 should fire.
2. I am pretty sure this is somehow related to the fact that I'm using Map
attributes, and not POJO to get price0 and camera0. My issue is that I
won't know the parameters in advance (they are coming in a URL), so I can't
pre-declare them, and thus need something dynamic like a Map. Is this how
Drools is intended to be used? The documentation appears very POJO-centric.
I am using Drools 5.2
Thank you!
-Matt
--
View this message in context:
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