[rules-users] RE: how to find duplicate inlineeval
Sikkandar Nawabjan
Sikkandar.Nawabjan at ust-global.com
Wed Nov 14 05:02:03 EST 2007
Edson,
As you said i used inline eval. But am getting erroe message like this can't be used in static context.am using statelesssession to assert my objects.
i also put eval(this!=obj1) as follows.
$obj1:Object1($id:id,$name:name)
$obj2:Object1(id==$id,$name:name==$name, eval( this!=$obj1 )) eval($obj2!= $obj1)
Though my references are different the rule is not firing
Thanks and Regs
Basha
From: rules-users-bounces at lists.jboss.org on behalf of Edson Tirelli
Sent: Tue 11/13/2007 9:35 PM
To: Rules Users List
Subject: Re: [rules-users] RE: how to find duplicate
Sikkandar,
The only way to check for identity is to use an inline eval and use java code to check that:
when
$obj1:Object1($id:id,$name:name)
$obj2:Object1(id==$id,$name:name==$name, eval( this!=$obj1 ))
then
Another option is to configure your rulebase to not allow the same object to be matched by more than one pattern in your rules. To do that you can either set a system property:
drools.removeIdentities = true
Or you can use drools API:
RuleBaseConfiguration conf = new RuleBaseConfiguration();
conf.setRemoveIdentities( true );
RuleBase rulebase = RuleBaseFactory.newRuleBase( conf );
If you do that, your rule can be written as this:
when
$obj1:Object1($id:id,$name:name)
$obj2:Object1(id==$id,$name:name==$name)
then
Since the engine will never allow the same fact to simultaneously match both patterns.
[]s
Edson
2007/11/13, Sikkandar Nawabjan <Sikkandar.Nawabjan at ust-global.com>:
Hi,
am passing list of objects to working memory. i want to fire the rule if there is any duplicate objects in the list
i write code like this
when
$obj1:Object1($id:id,$name:name)
$obj2:Object1(id==$id,$name:name==$name,this!=$obj1)
then
fire rule
Now the problem lies at this!=objj1(a highlighted check). i put this to avoid a object check with itself.
But this is internally calling equals method of the corresponding object and always return true. Because i overriden equals method in the Object itself
so at the end the rule won't fire even if there is a duplicate object. how i can solve this
equals(Object obj){
if(this.id=obj.id&& this.name==obj.name)
return true;
else
return false;
}
________________________________
From: rules-users-bounces at lists.jboss.org on behalf of rules-users-request at lists.jboss.org
Sent: Tue 11/13/2007 2:04 AM
To: rules-users at lists.jboss.org
Subject: rules-users Digest, Vol 12, Issue 27
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Today's Topics:
1. Re: Drools and jBPM integration (Fabian Weisensee)
2. Re: java.lang.OutOfMemoryError: Java heap space (Edson Tirelli)
3. Re: Drools and jBPM integration (Mark Proctor)
4. Re: Drools and jBPM integration (Mark Proctor)
----------------------------------------------------------------------
Message: 1
Date: Mon, 12 Nov 2007 18:23:06 +0100
From: Fabian Weisensee <fabian at weisensee.net>
Subject: Re: [rules-users] Drools and jBPM integration
To: Rules Users List < rules-users at lists.jboss.org <mailto:rules-users at lists.jboss.org> >
Message-ID: <47388BFA.3010009 at weisensee.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Yes, thanks for your help. I'll try your suggestion for #2.
I resolved the deployment problem by myself. It was just a mistake with
the JBoss ESB deploying...
But now I have another problem. The rule file is found, but there seem
to be some problems with the parser.
The FireRulesActionHandler class from the jbpm wiki uses the following code:
RuleBaseImpl ruleBase = new RuleBaseImpl();
ruleBase.addPackage(pkg);
But the RuleBaseImpl class doesn't seem to be part of drools anymore. I
looked at the javadocs to find a replacement. I've found the
RuleBaseLoader class which looked like what I needed. I replaced the two
lines with this:
RuleBaseLoader rbl = RuleBaseLoader.getInstance();
RuleBase ruleBase = rbl.loadFromReader(reader);
ruleBase.addPackage(pkg);
but when I run this I get the following error:
ERROR [GraphElement] action threw exception: Unable to parser Reader
java.lang.RuntimeException : Unable to parser Reader
at org.drools.compiler.DrlParser.getParser(DrlParser.java:209)
at org.drools.compiler.DrlParser.parse(DrlParser.java:60)
at
org.drools.compiler.PackageBuilder.addPackageFromDrl (PackageBuilder.java:165)
at
org.drools.compiler.RuleBaseLoader.loadFromReader(RuleBaseLoader.java:38)
at
rechnung.kontrolle.FireRulesActionHandler.readRule(FireRulesActionHandler.java:92)
at
rechnung.kontrolle.FireRulesActionHandler.execute(FireRulesActionHandler.java:49)
Of course I thought my rule file would be syntacticaly incorrect, but
even this rule file didn't work:
package rechnung.kontrolle
rule "test rule 1"
when
then
System.out.println("rule fired!");
end
What am I doing wrong? Is RulesBaseLoader the right class?
Are there any other Informations about integrating jBPM and Drools?
--Fabian
Aziz Boxwala schrieb:
> Fabian,
>
> Response to #1: I believe the rule file needs to reside in the root
> directory of the archive/directory of the example application. I have
> not tried that out so not sure.
>
> With Drools 4.0.x, you have the option of having your rules be located
> in the BRMS.
>
> Response to #2: You should be able to do so using one decision-node.
> Associate the rule action handler with either the Before Signal or Node
> Enter event and specify your decision conditions on the transitions out
> of that node..
>
> --Aziz
>
> ----- Original Message ----
> From: Fabian Weisensee <fabian at weisensee.net>
> To: rules-users at lists.jboss.org
> Sent: Monday, November 12, 2007 7:35:02 AM
> Subject: [rules-users] Drools and jBPM integration
>
> Hi there
>
> I have some questions concerning Drools and jBPM integration.
> I know there is this wiki page:
> http://wiki.jboss.org/wiki/Wiki.jsp?page=JbpmAndDrools
> but first it's not really detailed and second does it seem to be outdated.
>
> 1) I changed the FireRulesActionHandler from the wiki to reflect the
> API-changes, that at least it's compileable. In the jBPM process
> definition the rule file is simply passed as parameter like this:
> "/Shipper.drl". To which directory does this relative path apply? So
> where do I have to deploy this rule file? I tried several locations in
> the application server, but even with an absolute path every time
> FireRulesActionHandler tries to read the rule it crashes:
>
> ERROR [GraphElement] action threw exception: null
> java.lang.NullPointerException
> at java.io <http://java.io/> <http://java.io.Re <http://java.io.re/> < http://java.io.re/ <http://java.io.re/> > >.Reader.<init>(Unknown Source)
> at java.io <http://java.io/> <http://java.io.In <http://java.io.in/> <http://java.io.in/ > >.InputStreamReader.<init>(Unknown Source)
> at
> rechnung.kontrolle.FireRulesActionHandler.readRule(FireRulesActionHandler.java:83)
> at
> rechnung.kontrolle.FireRulesActionHandler.execute (FireRulesActionHandler.java:50)
>
> 2) As I understood the example in the wiki you have to create a node
> which executes the rule and then a decision-node which routes the
> process flow according to the rule results.
> Is it possible to do this with just one node?
> But perhaps I should ask this at the jBPM forums.
>
> Every help would be appreciated. Thanks in advance.
>
> Fabian Weisensee
> _______________________________________________
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>
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------------------------------
Message: 2
Date: Mon, 12 Nov 2007 16:35:56 -0200
From: "Edson Tirelli" <tirelli at post.com>
Subject: Re: [rules-users] java.lang.OutOfMemoryError: Java heap space
To: "Rules Users List" <rules-users at lists.jboss.org>
Message-ID:
< e6dd5ba30711121035j634309ebq14f21d73ad68ce36 at mail.gmail.com <mailto:e6dd5ba30711121035j634309ebq14f21d73ad68ce36 at mail.gmail.com> >
Content-Type: text/plain; charset="iso-8859-1"
Thanks for reporting and providing workaround. I will look into fixing
that.
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