[rules-users] Agenda Groups basic question

[Rongala, Kanthi]

Hi,

As suggested, I made the following changes, to get the desired output. I have some questions regarding the approach to agenda-groups (in drools 5 context)

1. I had to enable auto-focus once per each agenda-group. I thought agenda-groups were stacked internally by drools engine, and auto-focus might be acting as a directional mechanism (help determine which rule under which agenda is to be triggered). Clearly, I am mistaken and it seems that auto-focus is the way to go.

I would like to know about other ways to set focus on agenda-groups. I have seem code snippets on google bearing session.setFocus("[agenda-group-name]"). I am currently using statefulsession and cann't figure out this 'setFocus()' method

2. I was 'compelled' to comment out lock-on-active directive. I understand that lock-on-active is an variant of no-loop causing each fact to be passed to the rule only once in a active agenda (correct me if I am mistaken). With lock-on-active set, I was expecting the messages to be print once atleast, but the current behavior beats me.

Code is given below:

package com.mscibarra.examples.drools.controllers;

import com.mscibarra.examples.drools.domainentities.*;

rule "Detect and Remove Duplicate Shelves"
agenda-group "Phase1"
//lock-on-active
dialect "mvel"
auto-focus
when
        $universe : LibraryUniverse()
        $shelf : Shelf() from $universe.shelves
        $shelf2 : Shelf(this != $shelf) from $universe.shelves
then
        System.out.println("Duplicate Shelves found::"+$shelf);
        // without the modify(), drools is not alerted about changes
        /*
        modify($universe) {
                shelves.remove($shelf);
        };
        */
end

rule "Singleton Shelf Detector"
agenda-group "Phase2"
//lock-on-active
dialect "mvel"
auto-focus
when
        $universe : LibraryUniverse(shelves.size > 1)
then
        System.out.println("Multiple Shelves found::"+$universe.shelves.size);
end



With Regards,
Swaroop

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Message: 3
Date: Mon, 2 Nov 2009 10:51:32 -0500
From: Edson Tirelli <ed.tirelli at gmail.com>
Subject: Re: [rules-users] Agenda Groups basic question
To: Rules Users List <rules-users at lists.jboss.org>
Message-ID:
        <e6dd5ba30911020751nb973184r73cd6dc46e4e50c0 at mail.gmail.com>
Content-Type: text/plain; charset="windows-1252"

   You need to set the focus for an agenda group to execute.

   []s
   Edson

2009/11/2 Rongala, Kanthi <Kanthi.Rongala at mscibarra.com>

>  Hi,
>
>
>
> I am new to Drools and trying my hands out at Drools 5. I cann?t figure out
> how to use agenda- groups. I have a small drl file with two agenda groups
> and one rule per agenda-group. This doesn?t seem to work. However if I
> happen to comment out the agenda-group attribute, the results are as
> expected.
>
>
>
> Please let me know what I am missing.
>
>
>
> *package* com.mscibarra.examples.drools.controllers;
>
>
>
> *import* com.mscibarra.examples.drools.domainentities.*;
>
>
>
>
>
> *rule* "Detect and Remove Duplicate Shelves"
>
> *agenda-group* "Phase1"
>
> *lock-on-active*
>
> *dialect* "mvel"
>
> *when*
>
>       $universe : LibraryUniverse()
>
>       $shelf : Shelf() *from* $universe.shelves
>
>       $shelf2 : Shelf(*this* != $shelf) *from*$universe.shelves
>
> *then*
>
>       System.out.println("Duplicate Shelves found::"+$shelf);
>
>       // without the modify(), drools is not alerted about changes
>
>       // $universe.shelves.remove($shelf);
>
>       /*
>
>       *modify*($universe) {
>
>             shelves.remove($shelf);
>
>       };
>
>       */
>
>
>
> *end*
>
>
>
> *rule* "Singleton Shelf Detector"
>
> *agenda-group* "Phase1"
>
> *lock-on-active*
>
> *dialect* "mvel"
>
> *when*
>
>       $universe : LibraryUniverse(shelves.size > 1)
>
> *then*
>
>       System.out.println("Multiple Shelves found::"+$universe.shelves.size);
>
>
> *End*
>
>
>
>
>
>
>
> With Regards,
>
> Kanthi Swaroop Rongala
>
> * *
>
>
>
> ------------------------------
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>


--
 Edson Tirelli
 JBoss Drools Core Development
 JBoss by Red Hat @ www.jboss.com
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Message: 4
Date: Mon, 2 Nov 2009 16:53:54 +0100
From: "Costigliola Joel \(EXT\)" <joel.costigliola-ext at natixis.com>
Subject: Re: [rules-users] Agenda Groups basic question
To: "'Rules Users List'" <rules-users at lists.jboss.org>
Message-ID:
        <201216F96E6D724F9296BFACF6DB54641E54C88380 at MSEUMAIL03.cib.net>
Content-Type: text/plain; charset="iso-8859-1"

Hello,

Maybe a typo mistake but both of your rules have the same agenda group (Phase1)

Regards,

Joel

NOTICE: If received in error, please destroy and notify sender. Sender does not intend to waive confidentiality or privilege. Use of this email is prohibited when received in error.