[rules-users] Replacing Hand Written Rules

[Wolfgang Laun]

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

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?






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
>>>>>
>>>>
>>>>
>>>> _______________________________________________
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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/
>>>
>>> _______________________________________________
>>> 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/
>
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
>