Re: [rules-users] expert: usage of ruleflow-groups

[Wolfgang Laun]

2010/5/5 miguel machado :
> Hi,
> First of all, thank you both for your answers.
>
> @Wolfgang:
> My problem is that i cannot have the different rule groups stacked. I may do
> as you suggested, but i'll have rules firing from other agenda-groups after
> the first agenda-group activations are all gone (because they go into the
> stack as well, right?).

No, no, no! Nothing goes on the stack unless you setFocus()!

What i'm looking for is a way to isolate the
> execution and just fire the rules within a specific set (aka just one
> group). Does this make any sense?

This is *exactly* what my sketchy statement sequence does, in
an existing application.
-W

> Thank you for your support. I appreciate all the help i can get.
> _ miguel
>
>
>
> On Tue, May 4, 2010 at 4:46 PM, Wolfgang Laun 
> wrote:
>>
>> I've been using agenda groups without any trouble for a similar problem,
>> doing
>>  setFocus( ... );
>>  insert( ... );... insert( ... );
>>  fireAllRules();
>> repeatedly.
>>
>> You don't have to be afraid of the focus stack growing indefinitely:You
>> control
>> the "push" (setFocus()), and if an agenda group's activations are all
>> gone, the
>> group is automatically popped from the stack.
>>
>> -W
>>
>> 2010/5/4 Miguel Machado :
>> > Hi there,
>> > I'm having some trouble implementing the desired workflow of rule firing
>> > in
>> > an application using drools expert. I've read the thread about the
>> > difference between ruleflow groups and agenda groups, but it is still
>> > unclear to me how to achieve what i need.
>> > What i intend to have is the ability to fire a specific set of rules
>> > according to the object i'm inserting into the ksession.
>> > I do not want to use agenda-groups because it stacks all the agenda
>> > groups
>> > declared on the rule file (as far as i understand) and therefore it may
>> > fire
>> > activations i do not want to be fired. Instead, i want to isolate them
>> > completely. I tried using ruleflow groups for this, but i cannot find a
>> > way
>> > to activate a specific group programmatically, before calling
>> > fireAllRules(), the way i can with agenda-groups (setFocus() method).
>> > That being said, i'm asking for help in trying to use either one of
>> > ruleflow/agenda groups or even both in order to get things working the
>> > way i
>> > described.
>> > Thanks in advance,
>> > _ miguel
>> >
>> > ___
>> > rules-users mailing list
>> > rules-users@lists.jboss.org
>> > https://lists.jboss.org/mailman/listinfo/rules-users
>> >
>> >
>>
>> ___
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>> rules-users@lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-users
>
>
>
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Re: [rules-users] Getting an Error While Executing Rule in Drools 5.0

[Puneet duggal]

@ Nikhil,

I am not sure weather it a good practice to seralize a package and store it
, i am new to it and  i am storing the drl  files in db .
Can we retrive our DRL file after retriving the packge from database.??


On 5/4/10, Nikhil S. Kulkarni  wrote:
>
>  Hi,
>
>
>
> I have compiled some rules and added it in packages. Then I
> serialized those packages and stored in database in the form of CLOB data
>
> Now  I am able to get Packages back from database and loaded it in
> RuleBase.
>
> But while executing Rule, I am getting the following Exception.
>
>
>
> java.lang.NullPointerException
>
> at
> org.drools.base.ClassFieldReader.getValue(ClassFieldReader.java:91)
>
> at
> org.drools.base.evaluators.EqualityEvaluatorsDefinition$StringEqualEvaluator.evaluate(EqualityEvaluatorsDefinition.java:1962)
>
> at
> org.drools.rule.LiteralRestriction.isAllowed(LiteralRestriction.java:92)
>
> at
> org.drools.rule.OrCompositeRestriction.isAllowed(OrCompositeRestriction.java:25)
>
> at
> org.drools.rule.MultiRestrictionFieldConstraint.isAllowed(MultiRestrictionFieldConstraint.java:97)
>
> at
> org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:143)
>
> at
> org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:360)
>
> at
> org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:344)
>
> at
> org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:185)
>
> at
> org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:146)
>
> at
> org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1046)
>
> at
> org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1001)
>
> at
> org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:788)
>
> at
> org.drools.reteoo.ReteooStatelessSession.execute(ReteooStatelessSession.java:201)
>
>
>
> The similar kind of issue is already logged by someone.
>
>
>
> Please inform If anyone has an idea about this.
>
> Waiting for Reply.
>
>
>
> Thanks & Regards,
>
> Nikhil S. Kulkarni
>
>
>
>
>
> MASTEK LTD.
> Mastek is in NASSCOM's 'India Top 20' Software Service Exporters List.
> In the US, we're called MAJESCOMASTEK
>
>
> ~~
>
> Opinions expressed in this e-mail are those of the individual and not that of 
> Mastek Limited, unless specifically indicated to that effect. Mastek Limited 
> does not accept any responsibility or liability for it. This e-mail and 
> attachments (if any) transmitted with it are confidential and/or privileged 
> and solely for the use of the intended person or entity to which it is 
> addressed. Any review, re-transmission, dissemination or other use of or 
> taking of any action in reliance upon this information by persons or entities 
> other than the intended recipient is prohibited. This e-mail and its 
> attachments have been scanned for the presence of computer viruses. It is the 
> responsibility of the recipient to run the virus check on e-mails and 
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Re: [rules-users] expert: usage of ruleflow-groups

[miguel machado]

Exactly! That's precisely why i'm trying to find a workaround. I have no way
to activate a specific set of rules except for stacking up activations using
agenda-groups.

Any other suggestions?
Thank you.



2010/5/4 Mauricio Salatino 

> if you use the new api's  (5.x StatefulKnowledgeSession instead of
> workingMemory) you don't have that methods exposed.
>
> 2010/5/4 vasilievip 
>
>> You could manually activate and deactivate ruleflow groups using
>> workingMemory.getAgenda().[de]activateRuleflowGroup(name).
>> workingMemory.getAgenda().[de]activateRuleflowGroup(name).
>> session.fireAllRules(); 
>> Source
>> --
>> View this message in context: Re: expert: usage of 
>> ruleflow-groups
>> Sent from the Drools - User mailing list 
>> archiveat
>>  Nabble.com.
>>
>> ___
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>>
>>
>
>
> --
> - http://salaboy.wordpress.com
> - http://www.jbug.com.ar
> - Salatino "Salaboy" Mauricio -
>
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Re: [rules-users] expert: usage of ruleflow-groups

[miguel machado]

Hi,

First of all, thank you both for your answers.

@mauricio:
I'm currently not using drools flow, only expert, so i'm not very familiar
with the approach you suggested. Isn't it possible to achieve this goal just
by using drools expert?

@Wolfgang:
My problem is that i cannot have the different rule groups stacked. I may do
as you suggested, but i'll have rules firing from other agenda-groups after
the first agenda-group activations are all gone (because they go into the
stack as well, right?). What i'm looking for is a way to isolate the
execution and just fire the rules within a specific set (aka just one
group). Does this make any sense?

Thank you for your support. I appreciate all the help i can get.
_ miguel




On Tue, May 4, 2010 at 4:46 PM, Wolfgang Laun wrote:

> I've been using agenda groups without any trouble for a similar problem,
> doing
>  setFocus( ... );
>  insert( ... );... insert( ... );
>  fireAllRules();
> repeatedly.
>
> You don't have to be afraid of the focus stack growing indefinitely:You
> control
> the "push" (setFocus()), and if an agenda group's activations are all gone,
> the
> group is automatically popped from the stack.
>
> -W
>
> 2010/5/4 Miguel Machado :
> > Hi there,
> > I'm having some trouble implementing the desired workflow of rule firing
> in
> > an application using drools expert. I've read the thread about the
> > difference between ruleflow groups and agenda groups, but it is still
> > unclear to me how to achieve what i need.
> > What i intend to have is the ability to fire a specific set of rules
> > according to the object i'm inserting into the ksession.
> > I do not want to use agenda-groups because it stacks all the agenda
> groups
> > declared on the rule file (as far as i understand) and therefore it may
> fire
> > activations i do not want to be fired. Instead, i want to isolate them
> > completely. I tried using ruleflow groups for this, but i cannot find a
> way
> > to activate a specific group programmatically, before calling
> > fireAllRules(), the way i can with agenda-groups (setFocus() method).
> > That being said, i'm asking for help in trying to use either one of
> > ruleflow/agenda groups or even both in order to get things working the
> way i
> > described.
> > Thanks in advance,
> > _ miguel
> >
> > ___
> > 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
>



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Re: [rules-users] expert: usage of ruleflow-groups

[Mauricio Salatino]

if you use the new api's  (5.x StatefulKnowledgeSession instead of
workingMemory) you don't have that methods exposed.

2010/5/4 vasilievip 

> You could manually activate and deactivate ruleflow groups using
> workingMemory.getAgenda().[de]activateRuleflowGroup(name).
> workingMemory.getAgenda().[de]activateRuleflowGroup(name).
> session.fireAllRules(); 
> Source
> --
> View this message in context: Re: expert: usage of 
> ruleflow-groups
> Sent from the Drools - User mailing list 
> archiveat
>  Nabble.com.
>
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>


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Re: [rules-users] expert: usage of ruleflow-groups

[vasilievip]

 You could manually activate and deactivate ruleflow groups using
workingMemory.getAgenda().[de]activateRuleflowGroup(name). 

workingMemory.getAgenda().[de]activateRuleflowGroup(name).
session.fireAllRules();

http://drools-java-rules-engine.46999.n3.nabble.com/Agenda-group-doesn-t-stay-set-td56599.html
Source 
-- 
View this message in context: 
http://drools-java-rules-engine.46999.n3.nabble.com/expert-usage-of-ruleflow-groups-tp776406p776798.html
Sent from the Drools - User mailing list archive at Nabble.com.
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Re: [rules-users] How to make this rule more memory efficient?

[Greg Barton]

It can handle it.  The limiting factor is available heap.

GreG

On May 4, 2010, at 10:55, Ryan Fitzgerald  wrote:

Hi Thomas,

You are correct in your interpretation of what I want to do.

I did consider adding the mappings as their own facts but I was concerned that 
the sheer number of them would overload drools. For each Cell instance, it can 
refer to up to 60 ProxyCell instances. With 20,000 Cell instances (in my 
proto-type), that means 1.2 million mappings.

Can drools handle these kinds of numbers of facts?

Thanks,
Ryan. 

-Original Message-
From: rules-users-boun...@lists.jboss.org 
[mailto:rules-users-boun...@lists.jboss.org] On Behalf Of Swindells, Thomas
Sent: 28 April 2010 10:17
To: Rules Users List
Subject: Re: [rules-users] How to make this rule more memory efficient?

If I understand the following
What I want to do is find out where I have a reference from any 
instance of Cell - cell1 - to any instance of ProxyCell - proxycell2 - 
but am missing a reference from cell2 to proxycell1 where proxycell2 
is a representation of
cell2 and proxycell1 is a representation of cell1.


What I think you saying is that if
C1 -> P2 then there must be a C2 -> P1
Where C2 == P2.cellId and P1 == C1.cellId.

I've not worked this through properly (It's still too early in the working day) 
but do you may make a win by inserting the mappings into working memory as 
their own facts (and so trading memory for processing time).  You can then 
reason over these relationships which should reduce the number of combinations 
that are made.
So have a rules like the following:

Rule "createRelationship" salience [high]
$cell1 : Cell()
$proxy2 : Proxy($cell1.relationships contains this.name) then insert new 
Relationship($cell1.id, $proxy2.id); end

Rule "check inverse" salience [low]
$relationship : Relationship()
$cell1 : Cell(id == $relationship.cellId)
$proxy2 : Proxy(id == $relationship.proxyId) not exist Relationship(cellId == 
$relationship.proxyId, proxyId == relationship.cellId) then //raise warning or 
whatever end


Hopefully this does what you wants and should be more efficient processing wise 
and activation count wise.
Thomas

-Original Message-
From: rules-users-boun...@lists.jboss.org [mailto:rules-users- 
boun...@lists.jboss.org] On Behalf Of Ryan Fitzgerald
Sent: 28 April 2010 09:46
To: Rules Users List
Subject: Re: [rules-users] How to make this rule more memory efficient?

Thanks Wolfgang.

Should I conclude therefore that high memory usage is unavoidable due 
to the number of facts that must be processed? I was hoping that there 
might be a clever way of writing the rules so that the rules engine 
can minimise the network it generates - even if it takes a little longer to 
execute.

All of the facts are read from a database and thus loaded into working memory.
My fallback position is to not load all these objects into working 
memory but instead embed into a rule, a service call that queries the 
db for all inconsistencies (effectively using SQL instead of a drools 
rule). However, since I will have other rules that operate on these 
objects in working memory, I was hoping to use these facts for all rules.

/Ryan.

-Original Message-
From: rules-users-boun...@lists.jboss.org [mailto:rules-users- 
boun...@lists.jboss.org] On Behalf Of Wolfgang Laun
Sent: 27 April 2010 14:59
To: Rules Users List
Subject: Re: [rules-users] How to make this rule more memory efficient?

If there are n Cell facts,
$cell1 : Cell()
$cell2 : Cell()
needs to create n*n pairs in the network before any reduction may set in.
Using
 $cell2 : Cell(this != $cell1)
reduces this by n, so we're still quadratic. Something like
$cell1 : Cell( $id1 : id )
$cell2 : Cell( id > $id1 )
reduces it to n*(n-1)/2 which is less than 50% of the original, but 
still quadratic.

-W

2010/4/26 Swindells, Thomas :
You should probably restrict it so that

$cell2 : Cell(this != $cell1)



Thomas



From: rules-users-boun...@lists.jboss.org
[mailto:rules-users-boun...@lists.jboss.org] On Behalf Of Ryan 
Fitzgerald
Sent: 26 April 2010 15:34
To: rules-users@lists.jboss.org
Subject: [rules-users] How to make this rule more memory efficient?



Hi,



Can anyone advise me on how to make a drools rule more memory efficient?
Here is the problem:



I have a Cell and a ProxyCell object classes.



The ProxyCell represents the Cell when their internal ID's match.



Each Cell and ProxyCell however has a unique name (not same as ID).



A Cell can reference (by name) a ProxyCell (as long as the ProxyCell 
does not represent that actual Cell - which would effectively be a 
self-reference and is not allowed).



What I want to do is find out where I have a reference from any 
instance of Cell - cell1 - to any instance of ProxyCell - proxycell2 
- but am missing a reference from cell2 to proxycell1 where 
proxycell2 is a representation of
cell2 and proxycell1 is a representation of cell1.



Here is the rule I have written for it:



rule "C

Re: [rules-users] Drools + ETL Process

[Mauricio Salatino]

that's good..
but please check the transaction configurations.. because that's the problem
I think

2010/5/4 

>  Hi Mauricio, team
>
> I mapped my javabean in the persistence.xml
>
> org.acme.drools.Account
>
> And after run my main test I can see the "account table" in DB, but it's
> still empty, probably I am missing something in the project configuration.
> Let me check and I'll reply back
>
> Tks!
>
>
>
>  -Original Message-
> From: andre.fons...@mail.com
> To: rules-users@lists.jboss.org
> Sent: Tue, May 4, 2010 12:28 pm
> Subject: Re: [rules-users] Drools + ETL Process
>
>   Hi Mauricio,
>
> It's below, thanks!
>
> 
>  version="1.0"
> xsi:schemaLocation=
> "http://java.sun.com/xml/ns/persistence
>  http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd
>  http://java.sun.com/xml/ns/persistence/orm
>  http://java.sun.com/xml/ns/persistence/orm_1_0.xsd";
> xmlns:orm="http://java.sun.com/xml/ns/persistence/orm";
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
> xmlns="http://java.sun.com/xml/ns/persistence";>
>
>  transaction-type="RESOURCE_LOCAL">
> org.hibernate.ejb.HibernatePersistence
> org.drools.persistence.session.SessionInfo
>
> org.drools.persistence.processinstance.ProcessInstanceInfo
>
> org.drools.persistence.processinstance.ProcessInstanceEventInfo
> org.drools.persistence.processinstance.WorkItemInfo
> 
>  value="org.hibernate.dialect.MySQLDialect" />
>  value="jdbc:mysql://localhost:3306/drools" />
>  value="com.mysql.jdbc.Driver" />
> 
> 
> 
>  value="org.hibernate.transaction.BTMTransactionManagerLookup" />
> 
> 
>
> 
>
>
>
>  -Original Message-
> From: Mauricio Salatino 
> To: Rules Users List 
> Sent: Mon, May 3, 2010 11:24 pm
> Subject: Re: [rules-users] Drools + ETL Process
>
>  Hi man,
> can you show us your persistence.xml file where it's defined 
> org.drools.persistence.jpa
> Persistence Unit?
>
>
>
> 2010/5/3 
>
>>
>>  Hi Mauricio, thanks for your reply
>>
>> I have commented the transaction , please check
>> http://pastebin.com/NxQyft2t
>> I put the hibernate log there too.
>>
>> There is no error, after the first time executed I have the tables created
>> in mysql
>>
>> | processinstanceeventinfo   |
>> | processinstanceinfo|
>> | processinstanceinfo_eventtypes |
>> | sessioninfo|
>> | workiteminfo   |
>>
>> but they are empty, this is because I am not creating a process just rules
>> and facts?
>>
>> the drools expert knowlege database persist rules and facts or this is
>> maintained only in the working memory?
>>
>> TIA
>>
>>
>>
>>
>>  -Original Message-
>> From: Mauricio Salatino 
>> To: Rules Users List 
>>   Sent: Sun, May 2, 2010 11:16 pm
>> Subject: Re: [rules-users] Drools + ETL Process
>>
>>  Ok looks nice.. but you shouldn't begin and commit the transaction. If
>> you remove that.. do you have some error?
>>
>> 2010/5/2 
>>
>>>  Hi Mauricio,
>>>
>>> Sorry if I was not clear. I have already installed Guvnor, and I have
>>> also changed repository.xml to persist data in MySQL.
>>> But I dont want to use Guvnor, I would like to author the rules and facts
>>> in Eclipse using Drools plugin ( I have also installed it ) and persist data
>>> in MySQL.
>>> That's because I'm trying to use JPAKnowlegeService
>>> Could you please take a look in the code of pastebin?
>>>
>>> TIA
>>>
>>>
>>>  -Original Message-
>>> From: Mauricio Salatino 
>>> To: Rules Users List 
>>>   Sent: Fri, Apr 30, 2010 6:54 pm
>>> Subject: Re: [rules-users] Drools + ETL Process
>>>
>>>  Hi man,
>>> you are mixing a lot of stuff here..
>>> I will recommend you the following steps for achieving the steps that you
>>> are mentioning
>>> 1) Install guvnor
>>> 2) author the rules inside it.. (it already contains a JCR repository,
>>> that is similar to a database, it will allow you to store rules there), you
>>> can also author some objects (fact model) inside guvnor.
>>> 3) Then you can create tests to execute the rules and see which rules are
>>> fired.
>>>
>>> Greetings, hope it helps!
>>> 2010/4/30 
>>>

  Hi Esteban,

 Sorry, I have only one week looking into Drools =)
 Yes, I am talking about Drools Expert Database

 Looking into this
 http://downloads.jboss.com/drools/docs/5.0.1.26597.FINAL/apidocs/org/drools/persistence/jpa/JPAKnowledgeService.htmlI
  tried a sample snippet

 http://pastebin.com/uJd5642D

 But its incomplete, for example, I need to create the Rule in the
 database also

 The things that I need to do are:
 1) Create Rule and Object Facts in Java and persist them in the Drools
 Expert Database
 2) Check in the Guvnor Interface the Rules and Facts created in the step
 before
 2) Fire the Rules created and get the response

[rules-users] Getting an Error While Executing Rule in Drools 5.0

[Nikhil S. Kulkarni]

Hi,

I have compiled some rules and added it in packages. Then I 
serialized those packages and stored in database in the form of CLOB data
Now  I am able to get Packages back from database and loaded it in RuleBase.
But while executing Rule, I am getting the following Exception.

java.lang.NullPointerException
at 
org.drools.base.ClassFieldReader.getValue(ClassFieldReader.java:91)
at 
org.drools.base.evaluators.EqualityEvaluatorsDefinition$StringEqualEvaluator.evaluate(EqualityEvaluatorsDefinition.java:1962)
at 
org.drools.rule.LiteralRestriction.isAllowed(LiteralRestriction.java:92)
at 
org.drools.rule.OrCompositeRestriction.isAllowed(OrCompositeRestriction.java:25)
at 
org.drools.rule.MultiRestrictionFieldConstraint.isAllowed(MultiRestrictionFieldConstraint.java:97)
at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:143)
at 
org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:360)
at 
org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:344)
at 
org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:185)
at 
org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:146)
at 
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1046)
at 
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1001)
at 
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:788)
at 
org.drools.reteoo.ReteooStatelessSession.execute(ReteooStatelessSession.java:201)

The similar kind of issue is already logged by someone.

Please inform If anyone has an idea about this.
Waiting for Reply.

Thanks & Regards,
Nikhil S. Kulkarni

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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[rules-users] Human Task with a graphical representation

[rudolf michael]

Hello there,
I was able to draw an "Incident on Workstation Process" using Drools flow
and i am going to test it today.

I have a Timer on every Human task where i need to log an OLA Exception when
the timer is due. this is easy but what is missing a graphical
representation for this.

is there a way to show/draw this information in my eclipse flow plung in so
for the business analyst to see it?

best regards,
Rudolf Michael
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Re: [rules-users] How to make this rule more memory efficient?

[Ryan Fitzgerald]

Hi Thomas,

You are correct in your interpretation of what I want to do.

I did consider adding the mappings as their own facts but I was concerned that 
the sheer number of them would overload drools. For each Cell instance, it can 
refer to up to 60 ProxyCell instances. With 20,000 Cell instances (in my 
proto-type), that means 1.2 million mappings.

Can drools handle these kinds of numbers of facts?

Thanks,
Ryan. 

-Original Message-
From: rules-users-boun...@lists.jboss.org 
[mailto:rules-users-boun...@lists.jboss.org] On Behalf Of Swindells, Thomas
Sent: 28 April 2010 10:17
To: Rules Users List
Subject: Re: [rules-users] How to make this rule more memory efficient?

If I understand the following
> What I want to do is find out where I have a reference from any 
> instance of Cell - cell1 - to any instance of ProxyCell - proxycell2 - 
> but am missing a reference from cell2 to proxycell1 where proxycell2 
> is a representation of
> cell2 and proxycell1 is a representation of cell1.


What I think you saying is that if
C1 -> P2 then there must be a C2 -> P1
Where C2 == P2.cellId and P1 == C1.cellId.

I've not worked this through properly (It's still too early in the working day) 
but do you may make a win by inserting the mappings into working memory as 
their own facts (and so trading memory for processing time).  You can then 
reason over these relationships which should reduce the number of combinations 
that are made.
So have a rules like the following:

Rule "createRelationship" salience [high]
$cell1 : Cell()
$proxy2 : Proxy($cell1.relationships contains this.name) then insert new 
Relationship($cell1.id, $proxy2.id); end

Rule "check inverse" salience [low]
$relationship : Relationship()
$cell1 : Cell(id == $relationship.cellId)
$proxy2 : Proxy(id == $relationship.proxyId) not exist Relationship(cellId == 
$relationship.proxyId, proxyId == relationship.cellId) then //raise warning or 
whatever end


Hopefully this does what you wants and should be more efficient processing wise 
and activation count wise.
Thomas

> -Original Message-
> From: rules-users-boun...@lists.jboss.org [mailto:rules-users- 
> boun...@lists.jboss.org] On Behalf Of Ryan Fitzgerald
> Sent: 28 April 2010 09:46
> To: Rules Users List
> Subject: Re: [rules-users] How to make this rule more memory efficient?
>
> Thanks Wolfgang.
>
> Should I conclude therefore that high memory usage is unavoidable due 
> to the number of facts that must be processed? I was hoping that there 
> might be a clever way of writing the rules so that the rules engine 
> can minimise the network it generates - even if it takes a little longer to 
> execute.
>
> All of the facts are read from a database and thus loaded into working memory.
> My fallback position is to not load all these objects into working 
> memory but instead embed into a rule, a service call that queries the 
> db for all inconsistencies (effectively using SQL instead of a drools 
> rule). However, since I will have other rules that operate on these 
> objects in working memory, I was hoping to use these facts for all rules.
>
> /Ryan.
>
> -Original Message-
> From: rules-users-boun...@lists.jboss.org [mailto:rules-users- 
> boun...@lists.jboss.org] On Behalf Of Wolfgang Laun
> Sent: 27 April 2010 14:59
> To: Rules Users List
> Subject: Re: [rules-users] How to make this rule more memory efficient?
>
> If there are n Cell facts,
>  $cell1 : Cell()
>  $cell2 : Cell()
> needs to create n*n pairs in the network before any reduction may set in.
> Using
>   $cell2 : Cell(this != $cell1)
> reduces this by n, so we're still quadratic. Something like
>  $cell1 : Cell( $id1 : id )
>  $cell2 : Cell( id > $id1 )
> reduces it to n*(n-1)/2 which is less than 50% of the original, but 
> still quadratic.
>
> -W
>
> 2010/4/26 Swindells, Thomas :
> > You should probably restrict it so that
> >
> > $cell2 : Cell(this != $cell1)
> >
> >
> >
> > Thomas
> >
> >
> >
> > From: rules-users-boun...@lists.jboss.org
> > [mailto:rules-users-boun...@lists.jboss.org] On Behalf Of Ryan 
> > Fitzgerald
> > Sent: 26 April 2010 15:34
> > To: rules-users@lists.jboss.org
> > Subject: [rules-users] How to make this rule more memory efficient?
> >
> >
> >
> > Hi,
> >
> >
> >
> > Can anyone advise me on how to make a drools rule more memory efficient?
> > Here is the problem:
> >
> >
> >
> > I have a Cell and a ProxyCell object classes.
> >
> >
> >
> > The ProxyCell represents the Cell when their internal ID's match.
> >
> >
> >
> > Each Cell and ProxyCell however has a unique name (not same as ID).
> >
> >
> >
> > A Cell can reference (by name) a ProxyCell (as long as the ProxyCell 
> > does not represent that actual Cell - which would effectively be a 
> > self-reference and is not allowed).
> >
> >
> >
> > What I want to do is find out where I have a reference from any 
> > instance of Cell - cell1 - to any instance of ProxyCell - proxycell2 
> > - but am missing a reference from cell2 to proxy

Re: [rules-users] How to make this rule more memory efficient?

[Ryan Fitzgerald]

Hi Wolfgang,

Sorry for the late reply on this.

Actually I did miss your earlier reply.

I applied the changes you suggested and made a few more tweaks and I have been 
able to get the memory down from over 1.5GB (where I was getting OOM 
exceptions) to 300MB.

I now realise that I have to be very careful how I define the patterns and 
order them. Thanks a million for your help.

/Ryan. 

-Original Message-
From: rules-users-boun...@lists.jboss.org 
[mailto:rules-users-boun...@lists.jboss.org] On Behalf Of Wolfgang Laun
Sent: 28 April 2010 10:25
To: Rules Users List
Subject: Re: [rules-users] How to make this rule more memory efficient?

Did you miss my earlier reply proposing an alternative order of patterns? ( I 
just saw that the second eval isn't necessary.) HEre is the revised form:

rule "Check consistent references"
when
   $proxy1 : ProxyCell()
   $cell1  : Cell( id == $proxy1.id )
   $proxy2 : ProxyCell( id > $proxy1.id,
eval( $cell1.references contains this.name ) )
   $cell2  : Cell( id == $proxy2.id, references not contains $proxy1.name ) 
then
   //report an error.
end

-W

On Wed, Apr 28, 2010 at 10:45 AM, Ryan Fitzgerald 
 wrote:
> Thanks Wolfgang.
>
> Should I conclude therefore that high memory usage is unavoidable due to the 
> number of facts that must be processed? I was hoping that there might be a 
> clever way of writing the rules so that the rules engine can minimise the 
> network it generates - even if it takes a little longer to execute.
>
> All of the facts are read from a database and thus loaded into working 
> memory. My fallback position is to not load all these objects into working 
> memory but instead embed into a rule, a service call that queries the db for 
> all inconsistencies (effectively using SQL instead of a drools rule). 
> However, since I will have other rules that operate on these objects in 
> working memory, I was hoping to use these facts for all rules.
>
> /Ryan.
>
> -Original Message-
> From: rules-users-boun...@lists.jboss.org 
> [mailto:rules-users-boun...@lists.jboss.org] On Behalf Of Wolfgang 
> Laun
> Sent: 27 April 2010 14:59
> To: Rules Users List
> Subject: Re: [rules-users] How to make this rule more memory efficient?
>
> If there are n Cell facts,
>  $cell1 : Cell()
>  $cell2 : Cell()
> needs to create n*n pairs in the network before any reduction may set in.
> Using
>  $cell2 : Cell(this != $cell1)
> reduces this by n, so we're still quadratic. Something like
>  $cell1 : Cell( $id1 : id )
>  $cell2 : Cell( id > $id1 )
> reduces it to n*(n-1)/2 which is less than 50% of the original, but still 
> quadratic.
>
> -W
>
> 2010/4/26 Swindells, Thomas :
>> You should probably restrict it so that
>>
>> $cell2 : Cell(this != $cell1)
>>
>>
>>
>> Thomas
>>
>>
>>
>> From: rules-users-boun...@lists.jboss.org
>> [mailto:rules-users-boun...@lists.jboss.org] On Behalf Of Ryan 
>> Fitzgerald
>> Sent: 26 April 2010 15:34
>> To: rules-users@lists.jboss.org
>> Subject: [rules-users] How to make this rule more memory efficient?
>>
>>
>>
>> Hi,
>>
>>
>>
>> Can anyone advise me on how to make a drools rule more memory efficient?
>> Here is the problem:
>>
>>
>>
>> I have a Cell and a ProxyCell object classes.
>>
>>
>>
>> The ProxyCell represents the Cell when their internal ID's match.
>>
>>
>>
>> Each Cell and ProxyCell however has a unique name (not same as ID).
>>
>>
>>
>> A Cell can reference (by name) a ProxyCell (as long as the ProxyCell 
>> does not represent that actual Cell - which would effectively be a 
>> self-reference and is not allowed).
>>
>>
>>
>> What I want to do is find out where I have a reference from any 
>> instance of Cell - cell1 - to any instance of ProxyCell - proxycell2 
>> - but am missing a reference from cell2 to proxycell1 where 
>> proxycell2 is a representation of
>> cell2 and proxycell1 is a representation of cell1.
>>
>>
>>
>> Here is the rule I have written for it:
>>
>>
>>
>> rule "Check consistent references"
>>
>> when
>>
>>     $cell1 : Cell()
>>
>>     $cell2 : Cell()
>>
>>     $proxycell1 : ProxyCell ( id = $cell1.id, $cell2.references 
>> contains this.name )
>>
>>     $proxycell2 : ProxyCell ( id = $cell2.id, $cell1.references 
>> not contains this.name )
>>
>> then
>>
>>     //report an error.
>>
>> end
>>
>>
>>
>>
>>
>> I have 10,000 instances of Cell and 10,000 instances of ProxyCell in 
>> working memory. For each instance of Cell, it can have references to 
>> 60 different ProxyCell instances. Loading the Cell and ProxyCell 
>> instances into working memory is not a problem. However, when I try 
>> to run this rule above, the memory quickly goes above 1GB and I eventually 
>> get an out of memory error.
>>
>>
>>
>> I was wondering if there is a better way to structure or write this 
>> rule so that it doesn't use so much memory.
>>
>>
>>
>> Thanks,
>>
>> Ryan.
>>
>>
>>
>> 
>> **

Re: [rules-users] Drools + ETL Process

[Mauricio Salatino]

I saw that you change the transaction-type to RESOURCE_LOCAL, and not JTA as
it's in the documentation.
In the documentation I think that it mention that drools requires JTA, for
it's internal mechanisms, that's why we use bitronix as a transaction
manager implementation.

2010/5/4 

>  Hi Mauricio,
>
> It's below, thanks!
>
> 
>  version="1.0"
> xsi:schemaLocation=
> "http://java.sun.com/xml/ns/persistence
>  http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd
>  http://java.sun.com/xml/ns/persistence/orm
>  http://java.sun.com/xml/ns/persistence/orm_1_0.xsd";
> xmlns:orm="http://java.sun.com/xml/ns/persistence/orm";
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
> xmlns="http://java.sun.com/xml/ns/persistence";>
>
>  transaction-type="RESOURCE_LOCAL">
> org.hibernate.ejb.HibernatePersistence
> org.drools.persistence.session.SessionInfo
>
> org.drools.persistence.processinstance.ProcessInstanceInfo
>
> org.drools.persistence.processinstance.ProcessInstanceEventInfo
> org.drools.persistence.processinstance.WorkItemInfo
> 
>  value="org.hibernate.dialect.MySQLDialect" />
>  value="jdbc:mysql://localhost:3306/drools" />
>  value="com.mysql.jdbc.Driver" />
> 
> 
> 
>  value="org.hibernate.transaction.BTMTransactionManagerLookup" />
> 
> 
>
> 
>
>
>
>  -Original Message-
> From: Mauricio Salatino 
> To: Rules Users List 
> Sent: Mon, May 3, 2010 11:24 pm
> Subject: Re: [rules-users] Drools + ETL Process
>
>  Hi man,
> can you show us your persistence.xml file where it's defined 
> org.drools.persistence.jpa
> Persistence Unit?
>
>
>
> 2010/5/3 
>
>>
>>  Hi Mauricio, thanks for your reply
>>
>> I have commented the transaction , please check
>> http://pastebin.com/NxQyft2t
>> I put the hibernate log there too.
>>
>> There is no error, after the first time executed I have the tables created
>> in mysql
>>
>> | processinstanceeventinfo   |
>> | processinstanceinfo|
>> | processinstanceinfo_eventtypes |
>> | sessioninfo|
>> | workiteminfo   |
>>
>> but they are empty, this is because I am not creating a process just rules
>> and facts?
>>
>> the drools expert knowlege database persist rules and facts or this is
>> maintained only in the working memory?
>>
>> TIA
>>
>>
>>
>>
>>  -Original Message-
>> From: Mauricio Salatino 
>> To: Rules Users List 
>>   Sent: Sun, May 2, 2010 11:16 pm
>> Subject: Re: [rules-users] Drools + ETL Process
>>
>>  Ok looks nice.. but you shouldn't begin and commit the transaction. If
>> you remove that.. do you have some error?
>>
>> 2010/5/2 
>>
>>>  Hi Mauricio,
>>>
>>> Sorry if I was not clear. I have already installed Guvnor, and I have
>>> also changed repository.xml to persist data in MySQL.
>>> But I dont want to use Guvnor, I would like to author the rules and facts
>>> in Eclipse using Drools plugin ( I have also installed it ) and persist data
>>> in MySQL.
>>> That's because I'm trying to use JPAKnowlegeService
>>> Could you please take a look in the code of pastebin?
>>>
>>> TIA
>>>
>>>
>>>  -Original Message-
>>> From: Mauricio Salatino 
>>> To: Rules Users List 
>>>   Sent: Fri, Apr 30, 2010 6:54 pm
>>> Subject: Re: [rules-users] Drools + ETL Process
>>>
>>>  Hi man,
>>> you are mixing a lot of stuff here..
>>> I will recommend you the following steps for achieving the steps that you
>>> are mentioning
>>> 1) Install guvnor
>>> 2) author the rules inside it.. (it already contains a JCR repository,
>>> that is similar to a database, it will allow you to store rules there), you
>>> can also author some objects (fact model) inside guvnor.
>>> 3) Then you can create tests to execute the rules and see which rules are
>>> fired.
>>>
>>> Greetings, hope it helps!
>>> 2010/4/30 
>>>

  Hi Esteban,

 Sorry, I have only one week looking into Drools =)
 Yes, I am talking about Drools Expert Database

 Looking into this
 http://downloads.jboss.com/drools/docs/5.0.1.26597.FINAL/apidocs/org/drools/persistence/jpa/JPAKnowledgeService.htmlI
  tried a sample snippet

 http://pastebin.com/uJd5642D

 But its incomplete, for example, I need to create the Rule in the
 database also

 The things that I need to do are:
 1) Create Rule and Object Facts in Java and persist them in the Drools
 Expert Database
 2) Check in the Guvnor Interface the Rules and Facts created in the step
 before
 2) Fire the Rules created and get the response

  Is there someone that have experience using JPA persistence with
 Drools? I already have a simple project configured using JPA and Hibernate
 but I still don't know how to proceed =(

 Thanks In Advance !
   -Original Message-
 From: Esteban Aliverti 
 To: Rules Use

Re: [rules-users] Drools + ETL Process

[andre . fonseca]

 Hi Mauricio, team

I mapped my javabean in the persistence.xml

org.acme.drools.Account

And after run my main test I can see the "account table" in DB, but it's still 
empty, probably I am missing something in the project configuration.
Let me check and I'll reply back

Tks!

 


 

 

-Original Message-
From: andre.fons...@mail.com
To: rules-users@lists.jboss.org
Sent: Tue, May 4, 2010 12:28 pm
Subject: Re: [rules-users] Drools + ETL Process


 Hi Mauricio,

It's below, thanks!


http://java.sun.com/xml/ns/persistence
 http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd
 http://java.sun.com/xml/ns/persistence/orm 
 http://java.sun.com/xml/ns/persistence/orm_1_0.xsd";
xmlns:orm="http://java.sun.com/xml/ns/persistence/orm";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xmlns="http://java.sun.com/xml/ns/persistence";>


org.hibernate.ejb.HibernatePersistence
org.drools.persistence.session.SessionInfo

org.drools.persistence.processinstance.ProcessInstanceInfo

org.drools.persistence.processinstance.ProcessInstanceEventInfo
org.drools.persistence.processinstance.WorkItemInfo













 


 

 

-Original Message-
From: Mauricio Salatino 
To: Rules Users List 
Sent: Mon, May 3, 2010 11:24 pm
Subject: Re: [rules-users] Drools + ETL Process


Hi man,
can you show us your persistence.xml file where it's defined 
org.drools.persistence.jpa Persistence Unit?




2010/5/3  

 

 Hi Mauricio, thanks for your reply


 
I have commented the transaction , please check http://pastebin.com/NxQyft2t
I put the hibernate log there too.

There is no error, after the first time executed I have the tables created in 
mysql

| processinstanceeventinfo   |
| processinstanceinfo|
| processinstanceinfo_eventtypes |
| sessioninfo|
| workiteminfo   |

but they are empty, this is because I am not creating a process just rules and 
facts?

the drools expert knowlege database persist rules and facts or this is 
maintained only in the working memory?

TIA




 


-Original Message-
From: Mauricio Salatino 
To: Rules Users List 



Sent: Sun, May 2, 2010 11:16 pm
Subject: Re: [rules-users] Drools + ETL Process


Ok looks nice.. but you shouldn't begin and commit the transaction. If you 
remove that.. do you have some error? 


2010/5/2  

 Hi Mauricio,

Sorry if I was not clear. I have already installed Guvnor, and I have also 
changed repository.xml to persist data in MySQL.
But I dont want to use Guvnor, I would like to author the rules and facts in 
Eclipse using Drools plugin ( I have also installed it ) and persist data in 
MySQL.
That's because I'm trying to use JPAKnowlegeService
Could you please take a look in the code of pastebin?

TIA


 

 


-Original Message-
From: Mauricio Salatino 
To: Rules Users List 



Sent: Fri, Apr 30, 2010 6:54 pm
Subject: Re: [rules-users] Drools + ETL Process


Hi man,
you are mixing a lot of stuff here..
I will recommend you the following steps for achieving the steps that you are 
mentioning
1) Install guvnor
2) author the rules inside it.. (it already contains a JCR repository, that is 
similar to a database, it will allow you to store rules there), you can also 
author some objects (fact model) inside guvnor.
3) Then you can create tests to execute the rules and see which rules are fired.

Greetings, hope it helps!

2010/4/30  

 

 Hi Esteban,

Sorry, I have only one week looking into Drools =)
Yes, I am talking about Drools Expert Database

Looking into this 
http://downloads.jboss.com/drools/docs/5.0.1.26597.FINAL/apidocs/org/drools/persistence/jpa/JPAKnowledgeService.html
 I tried a sample snippet

http://pastebin.com/uJd5642D

But its incomplete, for example, I need to create the Rule in the database also

The things that I need to do are:
1) Create Rule and Object Facts in Java and persist them in the Drools Expert 
Database
2) Check in the Guvnor Interface the Rules and Facts created in the step before
2) Fire the Rules created and get the response


 

 Is there someone that have experience using JPA persistence with Drools? I 
already have a simple project configured using JPA and Hibernate but I still 
don't know how to proceed =(

Thanks In Advance !



-Original Message-
From: Esteban Aliverti 
To: Rules Users List 
Sent: Thu, Apr 29, 2010 9:02 pm
Subject: Re: [rules-users] Drools + ETL Process


Which drools database are you talking about? If you just want to use drools 
expert, you don't need any db. If you want to persist your kbase or rules, feel 
free to use whatever mechanism you want.


2010/4/28  

 

 Hi all,

I am using Drools 5.0 with Tomcat 6 and MySQL.

Now I need to insert data in the drools database but I DON'T want to use the 
Guvnor interface.
This is becaus

Re: [rules-users] expert: usage of ruleflow-groups

[Wolfgang Laun]

I've been using agenda groups without any trouble for a similar problem, doing
  setFocus( ... );
  insert( ... );... insert( ... );
  fireAllRules();
repeatedly.

You don't have to be afraid of the focus stack growing indefinitely:You control
the "push" (setFocus()), and if an agenda group's activations are all gone, the
group is automatically popped from the stack.

-W

2010/5/4 Miguel Machado :
> Hi there,
> I'm having some trouble implementing the desired workflow of rule firing in
> an application using drools expert. I've read the thread about the
> difference between ruleflow groups and agenda groups, but it is still
> unclear to me how to achieve what i need.
> What i intend to have is the ability to fire a specific set of rules
> according to the object i'm inserting into the ksession.
> I do not want to use agenda-groups because it stacks all the agenda groups
> declared on the rule file (as far as i understand) and therefore it may fire
> activations i do not want to be fired. Instead, i want to isolate them
> completely. I tried using ruleflow groups for this, but i cannot find a way
> to activate a specific group programmatically, before calling
> fireAllRules(), the way i can with agenda-groups (setFocus() method).
> That being said, i'm asking for help in trying to use either one of
> ruleflow/agenda groups or even both in order to get things working the way i
> described.
> Thanks in advance,
> _ miguel
>
> ___
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>
>

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Re: [rules-users] expert: usage of ruleflow-groups

[Mauricio Salatino]

Hi miguel,
Did you try creating a new Drools Flow process with Rule Tasks inside it to
isolate each specific set of rules.
Then you can insert the facts into the working memory, start the process and
the rules will be executed secuencially.
You need to remember also that, if the rules are activated but the agenda
group is without focus, the rules will never fire.


2010/5/4 Miguel Machado 

> Hi there,
>
> I'm having some trouble implementing the desired workflow of rule firing in
> an application using drools expert. I've read the 
> thread about
> the difference between ruleflow groups and agenda groups, but it is still
> unclear to me how to achieve what i need.
>
> What i intend to have is the ability to fire a specific set of rules
> according to the object i'm inserting into the ksession.
>
> I do not want to use agenda-groups because it stacks all the agenda groups
> declared on the rule file (as far as i understand) and therefore it may fire
> activations i do not want to be fired. Instead, i want to isolate them
> completely. I tried using ruleflow groups for this, but i cannot find a way
> to activate a specific group programmatically, before calling
> fireAllRules(), the way i can with agenda-groups (setFocus() method).
>
> That being said, i'm asking for help in trying to use either one of
> ruleflow/agenda groups or even both in order to get things working the way i
> described.
>
> Thanks in advance,
> _ miguel
>
>
> ___
> rules-users mailing list
> rules-users@lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
>


-- 
- http://salaboy.wordpress.com
- http://www.jbug.com.ar
- Salatino "Salaboy" Mauricio -
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Re: [rules-users] Drools Flow: how to get knowledge session ID from WorkItem

[Mauricio Salatino]

Anatoly, if you can share your generic implementation that would be nice..
because a lot of people is looking for something like that.
I prefer custom and domain specific implementation, but it seams that a lot
of people is looking for something generic that can be reused.
I can blog about that generic idea too to spread the word and also mention
the different situations and the perspective of having decoupled and coupled
applications to the work items.

On Tue, May 4, 2010 at 11:16 AM, tolitius  wrote:

>
> @Alan,
>
>Implementation of WorkItemHandler is a custom ( "your" ) component. This
> means that this implementation may have anything injected ( set as property
> or at construction time ).
>
>Let's say you implement "YourCustomWorkItemHandler" to take a "session
> id" at the construction time ( good choice :) ), then to start the process
> you would:
>
>session = create a newStatefulKnowledgeSession()
>
>session.getWorkItemManager().registerWorkItemHandler(
>"WorkItemName", new
> YourCustomWorkItemHandler( session.getId() ) );
>
>session.startProcess( "process-name" );
>
> /Anatoly
> --
> View this message in context:
> http://drools-java-rules-engine.46999.n3.nabble.com/Drools-Flow-how-to-get-knowledge-session-ID-from-WorkItem-tp775649p776358.html
> Sent from the Drools - User mailing list archive at Nabble.com.
> ___
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>



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Re: [rules-users] Drools + ETL Process

[andre . fonseca]

 Hi Mauricio,

It's below, thanks!


http://java.sun.com/xml/ns/persistence
 http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd
 http://java.sun.com/xml/ns/persistence/orm 
 http://java.sun.com/xml/ns/persistence/orm_1_0.xsd";
xmlns:orm="http://java.sun.com/xml/ns/persistence/orm";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xmlns="http://java.sun.com/xml/ns/persistence";>


org.hibernate.ejb.HibernatePersistence
org.drools.persistence.session.SessionInfo

org.drools.persistence.processinstance.ProcessInstanceInfo

org.drools.persistence.processinstance.ProcessInstanceEventInfo
org.drools.persistence.processinstance.WorkItemInfo













 


 

 

-Original Message-
From: Mauricio Salatino 
To: Rules Users List 
Sent: Mon, May 3, 2010 11:24 pm
Subject: Re: [rules-users] Drools + ETL Process


Hi man,
can you show us your persistence.xml file where it's defined 
org.drools.persistence.jpa Persistence Unit?




2010/5/3  

 

 Hi Mauricio, thanks for your reply


 
I have commented the transaction , please check http://pastebin.com/NxQyft2t
I put the hibernate log there too.

There is no error, after the first time executed I have the tables created in 
mysql

| processinstanceeventinfo   |
| processinstanceinfo|
| processinstanceinfo_eventtypes |
| sessioninfo|
| workiteminfo   |

but they are empty, this is because I am not creating a process just rules and 
facts?

the drools expert knowlege database persist rules and facts or this is 
maintained only in the working memory?

TIA




 


-Original Message-
From: Mauricio Salatino 
To: Rules Users List 



Sent: Sun, May 2, 2010 11:16 pm
Subject: Re: [rules-users] Drools + ETL Process


Ok looks nice.. but you shouldn't begin and commit the transaction. If you 
remove that.. do you have some error? 


2010/5/2  

 Hi Mauricio,

Sorry if I was not clear. I have already installed Guvnor, and I have also 
changed repository.xml to persist data in MySQL.
But I dont want to use Guvnor, I would like to author the rules and facts in 
Eclipse using Drools plugin ( I have also installed it ) and persist data in 
MySQL.
That's because I'm trying to use JPAKnowlegeService
Could you please take a look in the code of pastebin?

TIA


 

 


-Original Message-
From: Mauricio Salatino 
To: Rules Users List 



Sent: Fri, Apr 30, 2010 6:54 pm
Subject: Re: [rules-users] Drools + ETL Process


Hi man,
you are mixing a lot of stuff here..
I will recommend you the following steps for achieving the steps that you are 
mentioning
1) Install guvnor
2) author the rules inside it.. (it already contains a JCR repository, that is 
similar to a database, it will allow you to store rules there), you can also 
author some objects (fact model) inside guvnor.
3) Then you can create tests to execute the rules and see which rules are fired.

Greetings, hope it helps!

2010/4/30  

 

 Hi Esteban,

Sorry, I have only one week looking into Drools =)
Yes, I am talking about Drools Expert Database

Looking into this 
http://downloads.jboss.com/drools/docs/5.0.1.26597.FINAL/apidocs/org/drools/persistence/jpa/JPAKnowledgeService.html
 I tried a sample snippet

http://pastebin.com/uJd5642D

But its incomplete, for example, I need to create the Rule in the database also

The things that I need to do are:
1) Create Rule and Object Facts in Java and persist them in the Drools Expert 
Database
2) Check in the Guvnor Interface the Rules and Facts created in the step before
2) Fire the Rules created and get the response


 

 Is there someone that have experience using JPA persistence with Drools? I 
already have a simple project configured using JPA and Hibernate but I still 
don't know how to proceed =(

Thanks In Advance !



-Original Message-
From: Esteban Aliverti 
To: Rules Users List 
Sent: Thu, Apr 29, 2010 9:02 pm
Subject: Re: [rules-users] Drools + ETL Process


Which drools database are you talking about? If you just want to use drools 
expert, you don't need any db. If you want to persist your kbase or rules, feel 
free to use whatever mechanism you want.


2010/4/28  

 

 Hi all,

I am using Drools 5.0 with Tomcat 6 and MySQL.

Now I need to insert data in the drools database but I DON'T want to use the 
Guvnor interface.
This is because in the future we'll need to use a kind of ETL process to 
populate the drools database.

Should I create a java class with JDBC access and perform a SQL direct to that 
tables?
I did the reverse engineering of the drools database but I could not understood 
yet where the data are persisted.

Any advice should be very helpful.

Thanks in advance.




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[rules-users] expert: usage of ruleflow-groups

[Miguel Machado]

Hi there,

I'm having some trouble implementing the desired workflow of rule firing in an 
application using drools expert. I've read the thread about the difference 
between ruleflow groups and agenda groups, but it is still unclear to me how to 
achieve what i need.

What i intend to have is the ability to fire a specific set of rules according 
to the object i'm inserting into the ksession. 

I do not want to use agenda-groups because it stacks all the agenda groups 
declared on the rule file (as far as i understand) and therefore it may fire 
activations i do not want to be fired. Instead, i want to isolate them 
completely. I tried using ruleflow groups for this, but i cannot find a way to 
activate a specific group programmatically, before calling fireAllRules(), the 
way i can with agenda-groups (setFocus() method).

That being said, i'm asking for help in trying to use either one of 
ruleflow/agenda groups or even both in order to get things working the way i 
described.

Thanks in advance,
_ miguel

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Re: [rules-users] Drools Flow: how to get knowledge session ID from WorkItem

[tolitius]

@Alan,

Implementation of WorkItemHandler is a custom ( "your" ) component. This
means that this implementation may have anything injected ( set as property
or at construction time ).

Let's say you implement "YourCustomWorkItemHandler" to take a "session
id" at the construction time ( good choice :) ), then to start the process
you would:

session = create a newStatefulKnowledgeSession()

session.getWorkItemManager().registerWorkItemHandler(
"WorkItemName", new YourCustomWorkItemHandler( 
session.getId() ) ); 

session.startProcess( "process-name" );

/Anatoly
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Re: [rules-users] Rules doubt

[Puneet duggal]

@Wolfgang,

thanks a lot for ur wonderful explanation regarding the Dialect...
But i still cant find the better way
to know the exact error in some cases ,one case
i had mentioned in my previous post ...i want to highlight
that my drl are loading from database so i cant put break point
in drl.

appreciate ur help.
thanks
Puneet


On 5/4/10, Wolfgang Laun  wrote:
>
> Here, I've found this for you, a comment from the Drools source file
> org.drools.rule.builder.dialect.java.JavaDialectConfiguration
>
> * There are options to use various flavours of runtime compilers.
> * Apache JCI is used as the interface to all the runtime compilers.
> *
> * You can also use the system property "drools.compiler" to set the
> desired compiler.
> * The valid values are "ECLIPSE" and "JANINO" only.
> *
> * drools.dialect.java.compiler = 
> * drools.dialect.java.lngLevel = <1.5|1.6>
> *
> * The default compiler is Eclipse and the default lngLevel is 1.5.
> * The lngLevel will attempt to autodiscover your system using the
> * system property "java.version"
> *
> * The JavaDialectConfiguration will attempt to validate that the
> specified compiler
> * is in the classpath, using ClassLoader.loasClass(String). If you intented
> to
> * just Janino sa the compiler you must either overload the compiler
> property before
> * instantiating this class or the PackageBuilder, or make sure
> Eclipse is in the
> * classpath, as Eclipse is the default.
>
> Try it without the JANINO setting - it *should* flag the setter with
> the incompatible types.
>
> If you haven't used MVEL so far, I don't see any reason to start now.
>
> -W
>
>
> 2010/5/4 Puneet duggal :
> > @  Wolfgang Laun ,
> >
> > i am using just this statement:-
> >
> > javaConf.setCompiler( JavaDialectConfiguration.JANINO );
> >
> > I dont know the exact use of this statement .I  am not using the mvel
> > , i tried to google abt it but couldnt find the use of this ...
> > can u through some light on this.
> >
> > Thanks
> >
> >
> > On 5/4/10, Wolfgang Laun  wrote:
> >>
> >> Actually, this kind of error isn't discovered by the Drools DRL
> compiler;
> >> it would be flagged by the Java compiler. (You can verify: if you make
> the
> >> same error in Java code, you'll get that error message.)
> >>
> >> But if you are using dialect "mvel" (are you?), this is not flagged as
> an
> >> error, and it would silently convert the Double to a String, and set
> >> fid31003 to "497.0". Is this what keeps your other rules from firing,
> i.e.,
> >> the excess ".0"?
> >>
> >> I suggest that you do not use "mvel" unless there is a compelling reason
> >> (in other rules). Even then, you might restrict use "mvel" to those
> rules
> >> where it is really necessary.
> >>
> >> -W
> >>
> >>
> >> 2010/5/4 Puneet duggal 
> >>>
> >>> drlFile = BusinessRuleUtils.createCombinedDrlDocument(id,map.get(id));
> >>>
> >>>  PackageBuilder PACKAGE_BUILDER = new
> >>> PackageBuilder(BUILDER_CONFIGURATION);
> >>>  org.drools.rule.Package pkg = null;
> >>>  PACKAGE_BUILDER
> >>>.addPackageFromDrl(new StringReader(drlFile));
> >>>  if (PACKAGE_BUILDER.hasErrors()) {
> >>>   DSM_LOGGER
> >>> .logFatal("Error has occured while building package. For
> >>> Parameter ID : "
> >>>   + id
> >>>   + " Error details are : "
> >>>   + PACKAGE_BUILDER.getErrors()
> >>> .toString());
> >>>  } else {
> >>>   pkg = PACKAGE_BUILDER.getPackage();
> >>>   RULEBASE.addPackage(pkg);
> >>>   DSM_LOGGER
> >>> .logInfo("Package created for Component Prmr ID : "
> >>>   + id);
> >>>  }
> >>>
> >>>
> >>>
> >>> This is the code which i am using  at it is not giving
> >>> any error  at the time creating  the drl file.it is also
> >>> not giving any error at the time of calling of execute()
> >>> method , but rules are not executed .
> >>>
> >>> On 5/4/10, Wolfgang Laun  wrote:
> 
>  Anatoly,
> 
>  please note that I wrote "please" to Puneet, which is usually not
>  considered
>  as being "impolite". Also, kindly note that I asked for more
>  information, which,
>  in my book, is not "inconsiderate", as simply deleting Puneet's post
>  might have been.
> 
>  I do resent being called a "hater", and I'll let the community judge
>  whether
>  my (admittedly ironic) kidding is "hateful". Somehow, however, posters
>  have to
>  be admonished to state their problem more detailed, without people on
>  the
>  list having to waste their time playing guessing games or writing
>  replies begging
>  for more information.
> 
>  -W
> 
>  PS: A you can see now, it was not a question of "debugging", and so
> you
>  have wasted
>  your time on a "simple question". :-)
> 
> 
>  On Tue, May 4, 2010 at 5:10 AM, tolitius  wrote:
> >
> >
> > @Wolfgang,
> >
> >No need to be a hater Wolfgang, the question is simple. I agree,
> >>>

Re: [rules-users] Rules doubt

[Wolfgang Laun]

Here, I've found this for you, a comment from the Drools source file
org.drools.rule.builder.dialect.java.JavaDialectConfiguration

 * There are options to use various flavours of runtime compilers.
 * Apache JCI is used as the interface to all the runtime compilers.
 *
 * You can also use the system property "drools.compiler" to set the
desired compiler.
 * The valid values are "ECLIPSE" and "JANINO" only.
 *
 * drools.dialect.java.compiler = 
 * drools.dialect.java.lngLevel = <1.5|1.6>
 *
 * The default compiler is Eclipse and the default lngLevel is 1.5.
 * The lngLevel will attempt to autodiscover your system using the
 * system property "java.version"
 *
 * The JavaDialectConfiguration will attempt to validate that the
specified compiler
 * is in the classpath, using ClassLoader.loasClass(String). If you intented to
 * just Janino sa the compiler you must either overload the compiler
property before
 * instantiating this class or the PackageBuilder, or make sure
Eclipse is in the
 * classpath, as Eclipse is the default.

Try it without the JANINO setting - it *should* flag the setter with
the incompatible types.

If you haven't used MVEL so far, I don't see any reason to start now.

-W


2010/5/4 Puneet duggal :
> @  Wolfgang Laun ,
>
> i am using just this statement:-
>
> javaConf.setCompiler( JavaDialectConfiguration.JANINO );
>
> I dont know the exact use of this statement .I  am not using the mvel
> , i tried to google abt it but couldnt find the use of this ...
> can u through some light on this.
>
> Thanks
>
>
> On 5/4/10, Wolfgang Laun  wrote:
>>
>> Actually, this kind of error isn't discovered by the Drools DRL compiler;
>> it would be flagged by the Java compiler. (You can verify: if you make the
>> same error in Java code, you'll get that error message.)
>>
>> But if you are using dialect "mvel" (are you?), this is not flagged as an
>> error, and it would silently convert the Double to a String, and set
>> fid31003 to "497.0". Is this what keeps your other rules from firing, i.e.,
>> the excess ".0"?
>>
>> I suggest that you do not use "mvel" unless there is a compelling reason
>> (in other rules). Even then, you might restrict use "mvel" to those rules
>> where it is really necessary.
>>
>> -W
>>
>>
>> 2010/5/4 Puneet duggal 
>>>
>>> drlFile = BusinessRuleUtils.createCombinedDrlDocument(id,map.get(id));
>>>
>>>  PackageBuilder PACKAGE_BUILDER = new
>>> PackageBuilder(BUILDER_CONFIGURATION);
>>>  org.drools.rule.Package pkg = null;
>>>  PACKAGE_BUILDER
>>>    .addPackageFromDrl(new StringReader(drlFile));
>>>  if (PACKAGE_BUILDER.hasErrors()) {
>>>   DSM_LOGGER
>>> .logFatal("Error has occured while building package. For
>>> Parameter ID : "
>>>   + id
>>>   + " Error details are : "
>>>   + PACKAGE_BUILDER.getErrors()
>>> .toString());
>>>  } else {
>>>   pkg = PACKAGE_BUILDER.getPackage();
>>>   RULEBASE.addPackage(pkg);
>>>   DSM_LOGGER
>>> .logInfo("Package created for Component Prmr ID : "
>>>   + id);
>>>  }
>>>
>>>
>>>
>>> This is the code which i am using  at it is not giving
>>> any error  at the time creating  the drl file.it is also
>>> not giving any error at the time of calling of execute()
>>> method , but rules are not executed .
>>>
>>> On 5/4/10, Wolfgang Laun  wrote:

 Anatoly,

 please note that I wrote "please" to Puneet, which is usually not
 considered
 as being "impolite". Also, kindly note that I asked for more
 information, which,
 in my book, is not "inconsiderate", as simply deleting Puneet's post
 might have been.

 I do resent being called a "hater", and I'll let the community judge
 whether
 my (admittedly ironic) kidding is "hateful". Somehow, however, posters
 have to
 be admonished to state their problem more detailed, without people on
 the
 list having to waste their time playing guessing games or writing
 replies begging
 for more information.

 -W

 PS: A you can see now, it was not a question of "debugging", and so you
 have wasted
 your time on a "simple question". :-)


 On Tue, May 4, 2010 at 5:10 AM, tolitius  wrote:
>
>
> @Wolfgang,
>
>    No need to be a hater Wolfgang, the question is simple. I agree,
> examples would be helpful, but that is NOT how you grow a friendly
> community.
>
>    Community is the biggest problem JBoss has. Why is it so inhumanly
> difficult to be polite and considerate?
>
> /Anatoly
>
> --
> View this message in context:
> http://drools-java-rules-engine.46999.n3.nabble.com/Rules-doubt-tp774023p775029.html
> Sent from the Drools - User mailing list archive at Nabble.com.
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Re: [rules-users] Rules doubt

[tolitius]

@Wolfgang,

1.Thank you for being considered, and not simply deleting Puneet's
question.

2.I know that "debugging" was not the right answer, in case the
error meant "his rule did not even compile", and it was not a "business"
error.

2.After Puneet's gave you a better description, you answer (
pb.getErrors() ) had nothing to do with the actual description.

3.@salaboy gave the same answer ( kbuilder.getErrors() ) only based
on the initial  question, was he sitting a little to the left with a better
vision, so the font did not need to be enlarged for him?

The moral is: "Knowledge in a matter ( and the power to delete the post )
should not make you less willing to help".

/Anatoly
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Re: [rules-users] Rules doubt

[Puneet duggal]

@  Wolfgang Laun ,

i am using just this statement:-

javaConf.setCompiler( JavaDialectConfiguration.*JANINO* );

I dont know the exact use of this statement .I  am not using the mvel
, i tried to google abt it but couldnt find the use of this ...
can u through some light on this.

Thanks



On 5/4/10, Wolfgang Laun  wrote:
>
> Actually, this kind of error isn't discovered by the Drools DRL compiler;
> it would be flagged by the Java compiler. (You can verify: if you make the
> same error in Java code, you'll get that error message.)
>
> But if you are using dialect "mvel" (are you?), this is not flagged as an
> error, and it would silently convert the Double to a String, and set
> fid31003 to "497.0". Is this what keeps your other rules from firing, i.e.,
> the excess ".0"?
>
> I suggest that you do not use "mvel" unless there is a compelling reason
> (in other rules). Even then, you might restrict use "mvel" to those rules
> where it is really necessary.
>
> -W
>
>
> 2010/5/4 Puneet duggal 
>
>> drlFile = BusinessRuleUtils.createCombinedDrlDocument(id,map.get(id));
>>
>>  PackageBuilder PACKAGE_BUILDER = new
>> PackageBuilder(BUILDER_CONFIGURATION);
>>  org.drools.rule.Package pkg = null;
>>  PACKAGE_BUILDER
>>.addPackageFromDrl(new StringReader(drlFile));
>>  if (PACKAGE_BUILDER.hasErrors()) {
>>   DSM_LOGGER
>> .logFatal("Error has occured while building package. For Parameter
>> ID : "
>>   + id
>>   + " Error details are : "
>>   + PACKAGE_BUILDER.getErrors()
>> .toString());
>>  } else {
>>   pkg = PACKAGE_BUILDER.getPackage();
>>   RULEBASE.addPackage(pkg);
>>   DSM_LOGGER
>> .logInfo("Package created for Component Prmr ID : "
>>   + id);
>>  }
>>
>>
>> This is the code which i am using  at it is not giving
>> any error  at the time creating  the drl file.it is also
>> not giving any error at the time of calling of execute()
>> method , but rules are not executed .
>>
>>
>> On 5/4/10, Wolfgang Laun  wrote:
>>>
>>> Anatoly,
>>>
>>> please note that I wrote "please" to Puneet, which is usually not
>>> considered
>>> as being "impolite". Also, kindly note that I asked for more information,
>>> which,
>>> in my book, is not "inconsiderate", as simply deleting Puneet's post
>>> might have been.
>>>
>>> I do resent being called a "hater", and I'll let the community judge
>>> whether
>>> my (admittedly ironic) kidding is "hateful". Somehow, however, posters
>>> have to
>>> be admonished to state their problem more detailed, without people on the
>>> list having to waste their time playing guessing games or writing replies
>>> begging
>>> for more information.
>>>
>>> -W
>>>
>>> PS: A you can see now, it was not a question of "debugging", and so you
>>> have wasted
>>> your time on a "simple question". :-)
>>>
>>>
>>>
>>> On Tue, May 4, 2010 at 5:10 AM, tolitius  wrote:
>>>


 @Wolfgang,

No need to be a hater Wolfgang, the question is simple. I agree,
 examples would be helpful, but that is NOT how you grow a friendly
 community.

Community is the biggest problem JBoss has. Why is it so inhumanly
 difficult to be polite and considerate?

 /Anatoly

 --
 View this message in context:
 http://drools-java-rules-engine.46999.n3.nabble.com/Rules-doubt-tp774023p775029.html
 Sent from the Drools - User mailing list archive at Nabble.com.
 ___
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 rules-users@lists.jboss.org
 https://lists.jboss.org/mailman/listinfo/rules-users

>>>
>>>
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>>>
>>
>>
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Re: [rules-users] Rules doubt

[Wolfgang Laun]

Actually, this kind of error isn't discovered by the Drools DRL compiler; it
would be flagged by the Java compiler. (You can verify: if you make the same
error in Java code, you'll get that error message.)

But if you are using dialect "mvel" (are you?), this is not flagged as an
error, and it would silently convert the Double to a String, and set
fid31003 to "497.0". Is this what keeps your other rules from firing, i.e.,
the excess ".0"?

I suggest that you do not use "mvel" unless there is a compelling reason (in
other rules). Even then, you might restrict use "mvel" to those rules where
it is really necessary.

-W


2010/5/4 Puneet duggal 

> drlFile = BusinessRuleUtils.createCombinedDrlDocument(id,map.get(id));
>  PackageBuilder PACKAGE_BUILDER = new
> PackageBuilder(BUILDER_CONFIGURATION);
>  org.drools.rule.Package pkg = null;
>  PACKAGE_BUILDER
>.addPackageFromDrl(new StringReader(drlFile));
>  if (PACKAGE_BUILDER.hasErrors()) {
>   DSM_LOGGER
> .logFatal("Error has occured while building package. For Parameter
> ID : "
>   + id
>   + " Error details are : "
>   + PACKAGE_BUILDER.getErrors()
> .toString());
>  } else {
>   pkg = PACKAGE_BUILDER.getPackage();
>   RULEBASE.addPackage(pkg);
>   DSM_LOGGER
> .logInfo("Package created for Component Prmr ID : "
>   + id);
>  }
>
>
> This is the code which i am using  at it is not giving
> any error  at the time creating  the drl file.it is also
> not giving any error at the time of calling of execute()
> method , but rules are not executed .
>
>
> On 5/4/10, Wolfgang Laun  wrote:
>>
>> Anatoly,
>>
>> please note that I wrote "please" to Puneet, which is usually not
>> considered
>> as being "impolite". Also, kindly note that I asked for more information,
>> which,
>> in my book, is not "inconsiderate", as simply deleting Puneet's post might
>> have been.
>>
>> I do resent being called a "hater", and I'll let the community judge
>> whether
>> my (admittedly ironic) kidding is "hateful". Somehow, however, posters
>> have to
>> be admonished to state their problem more detailed, without people on the
>> list having to waste their time playing guessing games or writing replies
>> begging
>> for more information.
>>
>> -W
>>
>> PS: A you can see now, it was not a question of "debugging", and so you
>> have wasted
>> your time on a "simple question". :-)
>>
>>
>>
>> On Tue, May 4, 2010 at 5:10 AM, tolitius  wrote:
>>
>>>
>>>
>>> @Wolfgang,
>>>
>>>No need to be a hater Wolfgang, the question is simple. I agree,
>>> examples would be helpful, but that is NOT how you grow a friendly
>>> community.
>>>
>>>Community is the biggest problem JBoss has. Why is it so inhumanly
>>> difficult to be polite and considerate?
>>>
>>> /Anatoly
>>>
>>> --
>>> View this message in context:
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Re: [rules-users] Drools Flow: how to get knowledge session ID from WorkItem

[Chris Raschl]

Hi Alan,

On 2010-05-04 13:10, alan.gai...@tessella.com wrote:
> The subject says it all really: is there any way of determining the
> knowledge session ID from the WorkItem argument (or WorkItemManager
> argument?) passed in to the executeWorkItem method of an implementation
> of the WorkItemHandler interface?

I had the same problem so i simply extended the work item handler interface 
like this:

public interface SessionAwareWorkItemHandler extends WorkItemHandler {

StatefulKnowledgeSession getKnowledgeSession();
void setKnowledgeSession(StatefulKnowledgeSession session);
}

If you register a SessionAwareWorkItemHandler, just let him know about the 
session:

if (handler instanceof SessionAwareWorkItemHandler) {
SessionAwareWorkItemHandler sessionAware = 
(SessionAwareWorkItemHandler)handler;
sessionAware.setKnowledgeSession(ksession);
}

ksession.getWorkItemManager().registerWorkItemHandler("workItem", handler);

Hope this helps, it works for me.

- chris

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[rules-users] Drools Flow: how to get knowledge session ID from WorkItem

[Alan . Gairey]

The subject says it all really: is there any way of determining the 
knowledge session ID from the WorkItem argument (or WorkItemManager 
argument?) passed in to the executeWorkItem method of an implementation of 
the WorkItemHandler interface?
Any help would be very much appreciated.
Thanks,
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Re: [rules-users] Rules doubt

[Puneet duggal]

drlFile = BusinessRuleUtils.createCombinedDrlDocument(id,map.get(id));
 PackageBuilder PACKAGE_BUILDER = new
PackageBuilder(BUILDER_CONFIGURATION);
 org.drools.rule.Package pkg = null;
 PACKAGE_BUILDER
   .addPackageFromDrl(new StringReader(drlFile));
 if (PACKAGE_BUILDER.hasErrors()) {
  DSM_LOGGER
.logFatal("Error has occured while building package. For Parameter
ID : "
  + id
  + " Error details are : "
  + PACKAGE_BUILDER.getErrors()
.toString());
 } else {
  pkg = PACKAGE_BUILDER.getPackage();
  RULEBASE.addPackage(pkg);
  DSM_LOGGER
.logInfo("Package created for Component Prmr ID : "
  + id);
 }


This is the code which i am using  at it is not giving
any error  at the time creating  the drl file.it is also
not giving any error at the time of calling of execute()
method , but rules are not executed .


On 5/4/10, Wolfgang Laun  wrote:
>
> Anatoly,
>
> please note that I wrote "please" to Puneet, which is usually not
> considered
> as being "impolite". Also, kindly note that I asked for more information,
> which,
> in my book, is not "inconsiderate", as simply deleting Puneet's post might
> have been.
>
> I do resent being called a "hater", and I'll let the community judge
> whether
> my (admittedly ironic) kidding is "hateful". Somehow, however, posters have
> to
> be admonished to state their problem more detailed, without people on the
> list having to waste their time playing guessing games or writing replies
> begging
> for more information.
>
> -W
>
> PS: A you can see now, it was not a question of "debugging", and so you
> have wasted
> your time on a "simple question". :-)
>
>
>
> On Tue, May 4, 2010 at 5:10 AM, tolitius  wrote:
>
>>
>>
>> @Wolfgang,
>>
>>No need to be a hater Wolfgang, the question is simple. I agree,
>> examples would be helpful, but that is NOT how you grow a friendly
>> community.
>>
>>Community is the biggest problem JBoss has. Why is it so inhumanly
>> difficult to be polite and considerate?
>>
>> /Anatoly
>>
>> --
>> View this message in context:
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[rules-users] how "exists" works exactly?

[Antonio Neto]

Hi all,

I don't know exactly why I have a problem in my "exists" function. I've
tried many different ways, but it does not work. Anybody could help me,
please?


I have the following rules:

*rule "diff"
when
$var1: EReference(name == "employee")
$var2: EClass(name == "Company", EAllReferences contains $var1)
not (exists( EPackage(EClassifiers contains $var2 ) ))
then
insertLogical(new IntConstraintOccurrence("diff", 10));
end

rule "ClassesNotReferenced"
when
$q1 : EClass();
$q2 : EPackage(EClassifiers contains $q1);
not( exists ( EReference(EType == $q1) ));
then
insertLogical(new IntConstraintOccurrence("ClassesNotReferenced", 1,
$q1));
end*


and in my facts (and my EPackage) I have 4 instances of EClass "Company"
with a EReference "employee", and another EClass "Person".  I still have a
"move" that removes EClasses in my Drools Solver.

I need to have only one classe "Company" after processing. But it removes
only the EClass "Person", when it was supposed to remove one EClass "Person"
and 3 ECLasses "Company". Leaving one EClass "Company" in the end.

The problem is:  when Drools tries to remove a EClass "Person" it thinks
that  the EClass "Company" does not exists. But in fact there are 3 others.

Any clue about it, please ?

Thanks

Bests regards

Antonio
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[rules-users] Chained Rules

[djb]

Hi all,

I know there are some basic ways to chain rules together, by setting flags
in consequences that are checked in the conditions of other rules...

but in a large system based on rule templates, where thousands of rules are
generated, it is not feasible to chain rules in this manner, especially when
they are chained in a somewhat arbitrary fashion 
(eg. True if Rule 130 AND Rule 200 AND Rule 480 fire)

has anyone had this situation before?  would I need to execute this as a
post-processing step?  or, is there any design pattern that will allow rules
to be chained, preferably in a manageable way?

regards,
Daniel
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