[rules-users] Drools Community Clinic Feb 4th 5PM GMT

[Mark Proctor]

see no-loop or the more powerful lock-on-active.

Mark
Dan Seaver wrote:
> Sounds like a very good idea. If you go forward with this, I'd love to see
> your method for solving the following type of problem:
>
> I need to update a particular object without causing the rule to re-fire.
>
> Say I have two classes, Stack and Board. I need to choose the Stack to put
> each Board, so one of these sorting rulles would look like this:
>
> when
>    board : Board (thickness == 1)
>    stack : Stack (location == "A")
> then
>    board.setStack(stack);
>    update(board);
> end
>
> The problem is the update statement puts the rule back in the Agenda to be
> fired again, thus an infinite loop. My solution in general has been to use a
> Collection to track boards that have been processed, but it seems to be alot
> of overhead. I'm not pleased by my solution.
>
> when
>    board : Board (thickness == 1)
>    stack : Stack (location == "A")
>    processed : NamedCollection(name == "BoardsSorted", collection not
> contains board)
> then
>    board.setStack(stack);
>    update(board);
>    processed.add(board);
>    update(processed);
> end
>
> Also, the NamedCollection needs to be created, which I'm doing within the
> ruleset, which adds a somewhat meaningless to Business Analysts rule. Though
> I could create the NamedCollection in Java and add it to WorkingMemory prior
> to firing the rules, I'd like the rulesets to take care of themselves.
>
> My actual problem set is laced with many solutions that need to update
> objects. Even if the object is not directly related to the rule criteria, a
> map to the object needs to be created in the RHS so the LHS has a reference
> to the object being updated, thus posing the same problem as above.
>
> Your insights would be greatly appreciated.
>
>
> Mark Proctor wrote:
>   
>> I'm going to try an informal experiment for the 4th of February at 5PM 
>> GMT (Date/Time subject to change), we will run an online Drools Clinic 
>> in the form of a Webinar. So the idea here isn't of a 60 minute 
>> presentation, but really more of a 60 minute interactive Q&A where we 
>> will use the desktop to assist in some explanations talking through code 
>> or examples. What do people think?
>>
>> Ideally we would have a set of pre-determined questions, with some adhoc 
>> ones on the day too. Feel free to start listing your Qs here. I want to 
>> avoid "What's  WorkingMemory" type questions, but other than that, 
>> anything is game. Also if anyone has anything cool they would like to 
>> discuss about how they have used Drools, or just general interesting AI 
>> ideas, then that's fine too - happy for this just to turn into a fun 
>> geek chat too.
>>
>> Mark
>>
>> _______________________________________________
>> rules-users mailing list
>> rules-users at lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
>>
>>     
>
>   

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