[rules-users] Replacing Hand Written Rules

[Nirmal Fernando]

Hi,

On Sun, Oct 31, 2010 at 7:47 PM, Wolfgang Laun <wolfgang.laun at gmail.com>wrote:

> Is there a compelling reason for discarding the system that's in use now?
>

Mainly due to difficulty in maintaining a hand written large amount of
rules.


>
> It would appear that you are emulating the existing system's functions
> (_psubj,
> date, equality test) by some mechanism using reflection, which, in
> itself, will cause some
> overhead. Then, in the Drools rule, you are using eval(), which is the
> least efficient way of
> formulating a condition; none of the optimizations will work this way.
> This kind of
> transformation may result in a significant increase of execution time
> (which, of course, may not hurt you if there isn't much time spent in
> condition evaluation now.)
>
> The eval() call after then looks suspicious: is this a function you
> have defined?
>

Not really, I think this is drools eval function.
Ok, let me ask you like this, if I give you the following rule, can you
write an equivalent drools rule?

IF _psubj(be,$var0) ^ NOT date($var0) ^ NOT $var0=$Time THEN
^1_Existence:Entity(be,$var0)

Thanks for the great help!


>
>
>
>
>
> 2010/10/31 Nirmal Fernando <nirmal070125 at gmail.com>:
> > Hi Laun,
> >
> >> Consider that 5000+ is a large number. Estimate the time it'll take you
> >> to transform one rule: Will you be able to spend, say, 3 months for this
> >> task?
> >
> > We've already developed a piece of code which does this conversion.
> > Following is an example.
> > Can you please comment on the converted rule? whether it is a valid
> drools
> > rule or not?
> >
> > Our Rule
> > IF _psubj(be,$var0) ^ NOT date($var0) ^ NOT $var0=$Time THEN
> > ^1_Existence:Entity(be,$var0)
> >
> > Converted Drools Rule
> > rule "0"
> >     when p: Processor(
> eval(p.existence("_psubj(be,"+p.conceptVar[0]+")"))
> > && eval(!p.existence("date("+p.conceptVar[0]+")")) &&
> > eval(!p.testVar(p.conceptVar[0],"$Time")) )
> >     then
> >         eval(p.AppendRule("
> ^1_Existence:Entity(be,"+p.conceptVar[0]+")"));
> >     end
> >
> >
> >
> > Thanks.
> >>
> >> -W
> >>
> >>
> >> 2010/10/31 Nirmal Fernando <nirmal070125 at gmail.com>
> >>>
> >>> Something like following 2 rules:
> >>>
> >>> # IF when($Awareness,$var0) THEN ^1_Awareness:Time($Awareness,$var0)
> >>> # IF $relTime($Awareness,$Time) THEN
> ^1_Awareness:Time($Awareness,$Time)
> >>>
> >>> thanks.
> >>>
> >>> 2010/10/31 Wolfgang Laun <wolfgang.laun at gmail.com>
> >>>>
> >>>> What, exactly, do you mean by "hand written"? Java statements? Another
> >>>> Rule System?
> >>>> Can you provide a sample?
> >>>>
> >>>>
> >>>> 2010/10/31 Nirmal Fernando <nirmal070125 at gmail.com>
> >>>>>
> >>>>> Hi,
> >>>>>
> >>>>> I am having a 5000+ hand written rules which is used in an open
> source
> >>>>> project.
> >>>>> I am searching for the reasons, me to be shifted to a rule engine
> like
> >>>>> Drools, instead of using hand written once.
> >>>>> Drools rules can be debugged that will be a plus point, isn't it? I
> >>>>> would love to get a list of benefits that I will be getting.
> >>>>>
> >>>>> Thanks.
> >>>>>
> >>>>> --
> >>>>> Best Regards,
> >>>>> Nirmal
> >>>>>
> >>>>> C.S.Nirmal J. Fernando
> >>>>> Department of Computer Science & Engineering,
> >>>>> Faculty of Engineering,
> >>>>> University of Moratuwa,
> >>>>> Sri Lanka.
> >>>>> Blog: http://nirmalfdo.blogspot.com/
> >>>>>
> >>>>> _______________________________________________
> >>>>> rules-users mailing list
> >>>>> rules-users at lists.jboss.org
> >>>>> https://lists.jboss.org/mailman/listinfo/rules-users
> >>>>>
> >>>>
> >>>>
> >>>> _______________________________________________
> >>>> rules-users mailing list
> >>>> rules-users at lists.jboss.org
> >>>> https://lists.jboss.org/mailman/listinfo/rules-users
> >>>>
> >>>
> >>>
> >>>
> >>> --
> >>> Best Regards,
> >>> Nirmal
> >>>
> >>> C.S.Nirmal J. Fernando
> >>> Department of Computer Science & Engineering,
> >>> Faculty of Engineering,
> >>> University of Moratuwa,
> >>> Sri Lanka.
> >>> Blog: http://nirmalfdo.blogspot.com/
> >>>
> >>> _______________________________________________
> >>> rules-users mailing list
> >>> rules-users at lists.jboss.org
> >>> https://lists.jboss.org/mailman/listinfo/rules-users
> >>>
> >>
> >>
> >> _______________________________________________
> >> rules-users mailing list
> >> rules-users at lists.jboss.org
> >> https://lists.jboss.org/mailman/listinfo/rules-users
> >>
> >
> >
> >
> >
> > --
> > Best Regards,
> > Nirmal
> >
> > C.S.Nirmal J. Fernando
> > Department of Computer Science & Engineering,
> > Faculty of Engineering,
> > University of Moratuwa,
> > Sri Lanka.
> > Blog: http://nirmalfdo.blogspot.com/
> >
> > _______________________________________________
> > rules-users mailing list
> > rules-users at lists.jboss.org
> > https://lists.jboss.org/mailman/listinfo/rules-users
> >
> >
>
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>



-- 
Best Regards,
Nirmal

C.S.Nirmal J. Fernando
Department of Computer Science & Engineering,
Faculty of Engineering,
University of Moratuwa,
Sri Lanka.

Blog: http://nirmalfdo.blogspot.com/
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