RE: [rules-users] NPE in RightTuple
Possibly, upon inspection I found an entity class with suspicious looking hashCode and equals methods (source generate equals/hashcode is still to hard for some people it seems). I'm trying to recreate a simple test case, to reproduce. What's the simplest rule to generate a RightTupleIndexHashTable? Will any attribute constraint do e.g.: BadClass($value : value) BadClass(value == $value) Thanks, -Jess From: rules-users-boun...@lists.jboss.org [mailto:rules-users-boun...@lists.jboss.org] On Behalf Of Edson Tirelli Sent: Wednesday, January 14, 2009 4:43 PM To: Rules Users List Subject: Re: [rules-users] NPE in RightTuple Looks like a bug. Can you please open a JIRA with a test case? My guess is that your rules are changing a fact attribute that is causing the equals()/hashcode() methods of the object to return a different result? []s Edson 2009/1/14 Evans, Jess jev...@collegeboard.org Does anyone know what this would be indicative of? I've seen it occur periodically at which point I have to discard the session. I flatten and assert my data, run the rules, and then retract the handles collected on assertion. I've ensured the fact handle parameter is never null. I have the stateful session wrapped in a synchronized business façade, so I don't think it should be a concurrency issue (unless I have a bug of course). I'm running Drools 5 M4. java.lang.NullPointerException at org.drools.util.RightTupleIndexHashTable.remove(RightTupleIndexHashTable.java:224) at org.drools.reteoo.JoinNode.retractRightTuple(JoinNode.java:204) at org.drools.reteoo.ObjectTypeNode.retractObject(ObjectTypeNode.java:210) at org.drools.reteoo.EntryPointNode.retractObject(EntryPointNode.java:190) at org.drools.common.AbstractWorkingMemory.retract(AbstractWorkingMemory.java:1078) at org.drools.common.AbstractWorkingMemory.retract(AbstractWorkingMemory.java:1045) ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users -- Edson Tirelli JBoss Drools Core Development JBoss, a division of Red Hat @ www.jboss.com ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] NPE in RightTuple
Does anyone know what this would be indicative of? I've seen it occur periodically at which point I have to discard the session. I flatten and assert my data, run the rules, and then retract the handles collected on assertion. I've ensured the fact handle parameter is never null. I have the stateful session wrapped in a synchronized business façade, so I don't think it should be a concurrency issue (unless I have a bug of course). I'm running Drools 5 M4. java.lang.NullPointerException at org.drools.util.RightTupleIndexHashTable.remove(RightTupleIndexHashTable.java:224) at org.drools.reteoo.JoinNode.retractRightTuple(JoinNode.java:204) at org.drools.reteoo.ObjectTypeNode.retractObject(ObjectTypeNode.java:210) at org.drools.reteoo.EntryPointNode.retractObject(EntryPointNode.java:190) at org.drools.common.AbstractWorkingMemory.retract(AbstractWorkingMemory.java:1078) at org.drools.common.AbstractWorkingMemory.retract(AbstractWorkingMemory.java:1045) ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
RE: [rules-users] decision tables - no agenda group?
Sorry, would someone validate that there's no agenda group support in the decision table functionality? From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Evans, Jess Sent: Monday, December 01, 2008 10:06 PM To: Rules Users List Subject: [rules-users] decision tables - no agenda group? It doesn't appear that the decision table parser supports an agenda-group declaration. I find this odd since the documentation says it supports activation and ruleflow. Can someone validate this? thanks, -Jess ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
RE: [rules-users] Inline eval problem!
I don’t know your circumstances, but you might question why rank is a String in
the first place. Is the UI unduly influencing your data model? You could
always add a synthetic getter to your model itself and evade the eval
altogether:
public int getRankInt() { … }
That’s an ugly hack, but if your rank attribute is really an integer anyway…
In any case, I’d suggest that you add a guard in your conversion utility to
check for “” and null Strings maybe default to 0 or throw some exception.
Cheers,
-Jess
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of M.DILIP KUMAR
Sent: Tuesday, December 02, 2008 5:40 AM
To: Rules Users List
Subject: Re: [rules-users] Inline eval problem!
Hi ,
i can suggest one more way to solve it. Dont create instance in when part.
Instead of better you convert that helper class method as static methods.
So that u can call that method directly . but before that u should import that
helper class in drl file.
Or second way u can directly write a method in ur drl file itself.
Example :
import com.g2x.agility.leads.workflow.rulesengine.RuleUtilities;
ruleConvertRule
when
eval ( RuleUtilities.getStringToInteger( age) 40)
// getStringToInteger(String age) is static method
then
System.out.print(Name);
end
Defeat yourself today!
DILIP KUMAR.M
--- On Tue, 2/12/08, vanshi [EMAIL PROTECTED] wrote:
From: vanshi [EMAIL PROTECTED]
Subject: [rules-users] Inline eval problem!
To: rules-users@lists.jboss.org
Date: Tuesday, 2 December, 2008, 10:38 AM
I need to convert a variable from string to intger in the rule. That variable
here is rank, so, I create a helper class called 'Conversion' with just
one
function/method, which is supposed to convert the string argument passed to
it, to an integer and then I call that method in rule as inline eval.
What's
wrong here because this is not working and I don't want to change
'When'
part too much because it has 10 or so other variable with
connective,
which I've removed for clarity here. Any input would be appreciated much.
package harules;
import com.hibernate.Person;
import com.uhg.utils.Conversion;
rule one
salience 10
when
$con: Conversion();
pers: Person(age!= null , age = 18 , eval($con.getInteger(rank) 140))
then
System.out.println(Evaluated true);
end
//content of Conversion class
package com.utils;
public class Conversion {
public Integer getInteger(String s)
{
return Integer.parseInt(s);
}
}
--
View this message in context:
http://www.nabble.com/Inline-eval-problem%21-tp20786253p20786253.html
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RE: [rules-users] decision tables - no agenda group?
Thanks. Is it missing because declaring agenda group in decision table rules is a stupid thing to do because of X, or was it simply overlooked? From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Michal Bali Sent: Friday, December 05, 2008 8:26 PM To: Rules Users List Subject: Re: [rules-users] decision tables - no agenda group? I don't think there is. On Sat, Dec 6, 2008 at 1:00 AM, Evans, Jess [EMAIL PROTECTED] wrote: Sorry, would someone validate that there's no agenda group support in the decision table functionality? From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Evans, Jess Sent: Monday, December 01, 2008 10:06 PM To: Rules Users List Subject: [rules-users] decision tables - no agenda group? It doesn't appear that the decision table parser supports an agenda-group declaration. I find this odd since the documentation says it supports activation and ruleflow. Can someone validate this? thanks, -Jess ___ 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] decision tables - no agenda group?
It doesn't appear that the decision table parser supports an agenda-group declaration. I find this odd since the documentation says it supports activation and ruleflow. Can someone validate this? thanks, -Jess ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] 5.0 GA
Is there an ETA for the Drools 5.0 GA release? ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
RE: [rules-users] top n - accumulate function parameters
The MVEL trick works. That was exactly what I was hoping to find.
thanks,
-Jess
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Edson Tirelli
Sent: Tuesday, November 11, 2008 3:40 PM
To: Rules Users List
Subject: Re: [rules-users] top n - accumulate function parameters
Accumulate functions support only a single parameter, as they are
defined now, but would be great if someone can come up with a good way
of adding support to variable number of parameters.
Having said that, you can probably try a quick trick for your rules.
The way accumulate function works now is that it takes an expression as
the parameter, evaluate the expression and sends the result of the
expression to the accumulate function implementation. Example:
... accumulate( Cheese( $price: price ),
sum( $price * 10 ) )
So the engine will calculate $price * 10 and will send the result
into the function implementation.
So, if you are using MVEL dialect, you can use the list creation
simplified syntax to pass multiple parameters to the function. I never
tried, but should work:
rule xyz
dialect mvel
when
...
... accumlate( Cheese( $price : price ),
averageTop( [10, $price ] ) )
then
...
end
The syntax [ ] will create a list in MVEL and will pass it into the
method call:
public void accumulate(Serializable context, Object value) {
List values = (List) value;
...
}
Problem is you only have the parameters available in the
accumulate() and reverse() call... you don't have access to them in the
init() and result() call.
If you want to improve this, you are more than welcome!
[]s
Edson
2008/11/11 Evans, Jess [EMAIL PROTECTED]
I'm trying to average top N items. I can of course collect the
items and do the rest in the consequence, but thought it might be a
scenario applicable to a custom accumulate function. However, the
accumulate function interface methods only take one parameter. If I
were to declare a function top(N, things) within an accumulate call
would drools autobox the parameters into some sort of collection?
Maybe this is a naive solution anyway. I am still learning to
think declaratively.
cheers,
-Jess
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JBoss Drools Core Development
JBoss, a division of Red Hat @ www.jboss.com
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[rules-users] returning random limited query results
I'm trying to implement some suggestion functionality. Is there an efficient way to query for X random facts matching some constraint (e.g. ten random cheeses that cost less than 3 dollars)? I'd rather not generate the complete list if there's a more clever way. Unfortunately, the constraints are customer specific; otherwise, I'd just create sort of a central buffer list and dole out the random goodness to all takers. thanks, -Jess ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] Dynamic class generation and eclipse rule editor
So, I've whipped together a rudimentary bit of code to parse an excel and generate java bean fact classes and as well as the facts themselves. This great article (http://blog.athico.com/2006/12/dynamically-generated-class-beans-as.htm l http://blog.athico.com/2006/12/dynamically-generated-class-beans-as.htm l ) helped me to resolve the runtime rule compilation problem I had encountered. However, my eclipse rule editor shows problems for the dynamically generated class references which makes me sad. Is there any workaround to make these classes available to the rule editor or otherwise suppress the type checking for these classes? thanks, -Jess ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] fact base storage?
I'm trying to come up to speed on the drools capabilities. I see that drools supports loading rules from a decision table in a spreadsheet. I have a set of conversion tables that I'd like to represent as facts asserted when the rule base has been loaded, but before processing user requests. I could always model lookup tables in a database, but I'd rather not have to build the CRUD interface to manage them. I'd rather represent them so that each row in a spreadsheet represents a fact (based upon a predefined java bean). Of course, I could custom implement this functionality. However, I was wondering if drools supports some OOTB means of loading facts from Excel or other resource? thanks, -Jess ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
RE: [rules-users] RE: fact base storage?
Thanks for the confirmation. I think it should be straightforward to
implement a parser as you suggest to populate a list of java beans and
assert them to the working memory. I'm just surprised that this doesn't
already exist.
May I ask how you manage the working memory? It looks like you can't
clone or snapshot a working memory. So, you must either assert all the
default facts in a new working memory for every user session/request or
use a shared synchronized working memory. I'm building a web based
wizard calculator with around 10k default immutable facts. It's taking
almost 800ms to assert and fire to reach an initial state, so I'm
planning on sharing one synchronized session. Is this a reasonable
approach or am I off my rocker?
Cheers,
-Jess
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Vikrant
Yagnick
Sent: Thursday, October 09, 2008 2:45 PM
To: Rules Users List
Subject: [rules-users] RE: fact base storage?
Hi Jess,
I am facing the same problem right now. While, I do not know of any OOTB
ways to do this, I initially implemented an all rule solution.
In my case, I had a lookup table that based on a age or gender got a
rate or some value.
Using some Excel Trickery, I got the 2 dimensional table into one
dimensional columns of the type:
Age Gender Value
Age and Gender became conditions and Value became the Action.
In your case, you could form a column with a dummy LHS(1=1) and keep all
the columns as Action Columns.
In each Action Column you could build up your Fact.
For Example you could do the following:
Fact{ int a; int b;
}
ConditionActionAction
F: Fact
f.set($1);f.set($1)
Eval(true)Col A Col B
Dummy Value values for avalues for b
If you generate a rule base out of this, it should load your tables
straight as facts.
However, do note, that I did some rather QD benchmarks for this and
soon realized that the rulebase size and memory usage was getting really
large. (Especially the PermGen Size).
You may want to have a look at the memory usage, in case you need to
load a large number of tables. Due, to the above(and other reasons), I
just wrote a custom parser using JXL (The same Excel Library Drools uses
for Parsing Excels). It is really neat and would make a simple solution.
In, case you get another solution do post it to the list.
Cheers,
Vikrant
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Evans, Jess
Sent: Thursday, October 09, 2008 11:54 PM
To: rules-users@lists.jboss.org
Subject: [rules-users] fact base storage?
I'm trying to come up to speed on the drools capabilities. I see that
drools supports loading rules from a decision table in a spreadsheet. I
have a set of conversion tables that I'd like to represent as facts
asserted when the rule base has been loaded, but before processing user
requests. I could always model lookup tables in a database, but I'd
rather not have to build the CRUD interface to manage them. I'd rather
represent them so that each row in a spreadsheet represents a fact
(based upon a predefined java bean). Of course, I could custom
implement this functionality. However, I was wondering if drools
supports some OOTB means of loading facts from Excel or other resource?
thanks,
-Jess
MASTEK LTD.
Mastek is in NASSCOM's 'India Top 20' Software Service Exporters List.
In the US, we're called MAJESCOMASTEK
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RE: [rules-users] RE: fact base storage?
Thanks. That's the plan. However, my assumption is that even if the
data model and rules support partitioning that you still need to
synchronize calls to working memory so that two threads aren't invoking
insert, fire*, retract, etc. at the same time.
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Greg Barton
Sent: Thursday, October 09, 2008 6:13 PM
To: Rules Users List
Subject: RE: [rules-users] RE: fact base storage?
That model sounds quite reasonable. You may also find it useful to
partition your rules by user by having them match on a User object of
some kind and user state that matches up with each User.
rule
when
$u : User();
UserState(user == $u);
ImmutableFact1(...)
ImmutableFact2(...)
then
...
end
That way you could have multiple users being processed concurrently and
they wouldn't overlap.
--- On Thu, 10/9/08, Evans, Jess [EMAIL PROTECTED] wrote:
From: Evans, Jess [EMAIL PROTECTED]
Subject: RE: [rules-users] RE: fact base storage?
To: Rules Users List rules-users@lists.jboss.org
Date: Thursday, October 9, 2008, 4:32 PM Thanks for the confirmation.
I think it should be straightforward to implement a parser as you
suggest to populate a list of java beans and assert them to the
working memory. I'm just surprised that this doesn't already exist.
May I ask how you manage the working memory? It looks like you can't
clone or snapshot a working memory. So, you must either assert all
the default facts in a new working memory for every user
session/request or use a shared synchronized working memory. I'm
building a web based wizard calculator with around 10k default
immutable facts.
It's taking
almost 800ms to assert and fire to reach an initial state, so I'm
planning on sharing one synchronized session. Is this a reasonable
approach or am I off my rocker?
Cheers,
-Jess
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Vikrant
Yagnick
Sent: Thursday, October 09, 2008 2:45 PM
To: Rules Users List
Subject: [rules-users] RE: fact base storage?
Hi Jess,
I am facing the same problem right now. While, I do not know of any
OOTB ways to do this, I initially implemented an all rule solution.
In my case, I had a lookup table that based on a age or gender got a
rate or some value.
Using some Excel Trickery, I got the 2 dimensional table into one
dimensional columns of the type:
Age Gender Value
Age and Gender became conditions and Value became the Action.
In your case, you could form a column with a dummy LHS(1=1) and keep
all the columns as Action Columns.
In each Action Column you could build up your Fact.
For Example you could do the following:
Fact{ int a; int b;
}
ConditionAction
Action
F: Fact
f.set($1);
f.set($1)
Eval(true)Col A
Col B
Dummy Value values for a
values for b
If you generate a rule base out of this, it should load your tables
straight as facts.
However, do note, that I did some rather QD benchmarks for this and
soon realized that the rulebase size and memory usage was getting
really large. (Especially the PermGen Size).
You may want to have a look at the memory usage, in case you need to
load a large number of tables. Due, to the above(and other reasons), I
just wrote a custom parser using JXL (The same Excel Library Drools
uses for Parsing Excels). It is really neat and would make a simple
solution.
In, case you get another solution do post it to the list.
Cheers,
Vikrant
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Evans, Jess
Sent: Thursday, October 09, 2008 11:54 PM
To: rules-users@lists.jboss.org
Subject: [rules-users] fact base storage?
I'm trying to come up to speed on the drools capabilities. I see that
drools supports loading rules from a decision table in a spreadsheet.
I have a set of conversion tables that I'd like to represent as facts
asserted when the rule base has been loaded, but before processing
user requests. I could always model lookup tables in a database, but
I'd rather not have to build the CRUD interface to manage them.
I'd rather
represent them so that each row in a spreadsheet represents a fact
(based upon a predefined java bean). Of course, I could custom
implement this functionality. However, I was wondering if drools
supports some OOTB means of loading facts from Excel or other
resource?
thanks,
-Jess
MASTEK LTD.
Mastek is in NASSCOM's 'India Top 20' Software Service Exporters List.
In the US, we're called MAJESCOMASTEK
