[rules-users] Tuples discrimination

[Eymeric VIEUILLE]

Thanks a lot !

That will be helpful for me.

Regards,
Eymeric.

Edson Tirelli a écrit :
>  
>    Eymeric,
>
>    This is a fairly common case of finding the "best" of multiple 
> choices (usually, the max, min, etc). You can find some examples and 
> explanation in the wiki:
>
> http://wiki.jboss.org/wiki/Wiki.jsp?page=RulesFindMax
>
>     So, the answer to your question is: it must be done in the LHS. 
> AgendaFilters, IMO, should be used only for debug purposes, since they 
> are beyond the control of the rule writers.
>
>     BTW, the wiki was written when we had only Drools 3.0, so there is 
> no example of 4.0 features like accumulate, DSL, etc, so, feel free to 
> improve the docs with your findings and examples... :)
>
>     Thanks,
>         Edson
>
>
>
> 2007/9/12, Eymeric VIEUILLE <evieuille at gfi.fr <mailto:evieuille at gfi.fr>>:
>
>     Hi !
>
>     After solving the problem of Out of Memory, I come back with another
>     question :
>
>     I currently implemented rules that give me tuples like this (in the
>     agenda, before firing rules) : M1xM2xM3xM4.
>
>
>     But now, I want to select THE tuple that as M1xM2xM3xM4 with a
>     property
>     p as little as possible to execute the right hand of the rule.
>
>     For sample, I have the two following tuples activated in the agenda :
>
>     M'1(date = "09/25/2006")      M'1(date = "09/25/2006")
>     M'2(date = "09/26/2006")      M'2(date = "09/26/2006")
>     M'3(date = "09/29/2006")      M"3(date = "09/27/2006")
>     M'4(date = "09/31/2006")      M"4(date = "09/30/2006")
>
>     I would like the second tuples to be selected for executing the right
>     hand of the rule because dates of M'2, M"3, M"4 are the closest dates
>     compared to M'1.
>
>     The problem is that I do not know on what layer this selection must be
>     made : in the Left Hand of the rule ? Or in a AgendaFilter (selecting
>     the better tuple to use) ?
>
>     For the LH, I thought to the "accumate" CE, but I am affraid to have
>     unreadle rules (impossible to maintain). And I don't see quite
>     well how
>     to implement this with "accumulate" CE (knowing that I use a DSL).
>
>     For the AgendaFilter, I saw that only the current activation is
>     accessible...so impossible to compare whith other tuples
>     values....Moreover, I am affraid to make performance fall.
>
>     Is this selection possible ? And what would be the best practice to
>     implement it ?
>
>     Regards,
>     Eymeric.
>
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>
>
>
> -- 
>   Edson Tirelli
>   Software Engineer - JBoss Rules Core Developer
>   Office: +55 11 3529-6000
>   Mobile: +55 11 9287-5646
>   JBoss, a division of Red Hat @ www.jboss.com <http://www.jboss.com>
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