[rules-users] Convert logic to DRL rules
Mark Proctor
mproctor at codehaus.org
Mon Feb 19 13:42:00 EST 2007
'and' is not needed at top level, it is implicitely assumed that all
patters are under an 'and' CE.
Mark
Bill Zhang wrote:
> Edson,
>
> Thanks for the reply. The rule you authored worked fine on my new
> Drools build from SVN.
>
> However, I did notice that the following pattern matching is not working:
>
> $p: Person(
> (Person(some comparison logic) or Person(some comparison logic) )
> and
> (Person(some comparison logic) or Person(some comparison logic) )
> )
>
> Looks like althugh "or" is allowed, the new version does not use "and"
> within pattern matching. Am I right or did I do something wrong?
>
> Thanks,
>
> Bill
>
> On 2/19/07, Edson Tirelli <tirelli at post.com> wrote:
>> Bill,
>>
>> Unfortunatelly we are working hard to get all features finished in
>> time for the release and the documentation will only be done right
>> before release unless we get some help from community. So, maybe if you
>> (or anyone else) think you can help with that, we would gladly provide
>> you with info that when written down would be usefull both for your
>> users/team and to other drools users.
>>
>> You need to use bound variables when you want to do an OR (||)
>> between constraints of different fields inside a single Pattern. So, in
>> your example, as you want to do:
>>
>> lastOrderPrice > 300 OR totalOrderNumber >2
>>
>> For the same Person object, it means you need to do either:
>>
>> Person( $lop: lastOrderPrice, $ton: totalOrderNumber, ( $lop > 300 ||
>> $ton >2 ))
>>
>> Or using a predicate without the bound variables:
>>
>> $p: Person( ($p.getLastOrderPrice() > 300 || $p.getTotalOrderNumber() >
>> 2 ) )
>>
>> Or use an eval (that I think is the least efficient way):
>>
>> $p: Person()
>> eval( $p.getLastOrderPrice() > 300 || $p.getTotalOrderNumber() > 2 )
>>
>> From the above options, I would go with the first.
>> Unfortunatelly, there is no semantics currently defined for the
>> syntax you used:
>>
>> Person( lastOrderPrice > 300 || totalOrderNumber >2 )
>>
>> We may eventually do it in the future, but for now (Mark can confirm
>> that), we don't have resources to add it to the next major release
>> (again, unless community comes in to help).
>>
>> []s
>> Edson
>>
>>
>>
>>
>> Bill Zhang wrote:
>>
>> > That's it, Edson. I'll give it a try and I'll let you know whether I
>> > make it.
>> >
>> > Edson, I will appreciate if you can point to me where is the most
>> > recent syntax document. Thanks.
>> >
>> > I am not sure why I need to use bound variables ($lop:
>> > lastOrderPrice). Can I write it in the following:
>> >
>> > rule ...
>> > when
>> > $person : ( Person( age > 35 | <25,
>> > zipCode == "23546" | == "68570",
>> > ( lastOrderPrice > 300 ||
>> > totalOrderNumber >2 ))
>> > or
>> > Person( lastOrderCategory == "098" | == "109",
>> > zipCode == "74567" | == "23756" ) )
>> > then
>> > $person.setStatus( "KT" );
>> > end
>> >
>> >
>> >
>> > Thanks to everyone helping me. This is really a great community.
>> >
>> > On 2/19/07, Edson Tirelli <tirelli at post.com> wrote:
>> >
>> >>
>> >> Bill,
>> >>
>> >> Your statement bellow can be written in 3.1M1 as:
>> >>
>> >> rule ...
>> >> when
>> >> $person : ( Person( age > 35 | <25,
>> >> zipCode == "23546" | == "68570",
>> >> $lop: lastOrderPrice,
>> >> $ton: totalOrderNumber,
>> >> ( $lop > 300 || $ton >2 ))
>> >> or
>> >> Person( lastOrderCategory == "098" | == "109",
>> >> zipCode == "74567" | == "23756" ) )
>> >> then
>> >> $person.setStatus( "KT" );
>> >> end
>> >>
>> >> []s
>> >> Edson
>> >>
>> >> Bill Zhang wrote:
>> >>
>> >> > Hi Alex,
>> >> >
>> >> > Thank you for confirming this. Writing such a builder may take us a
>> >> > lot of time because our business user is used to free style
>> >> > Pascal-like authoring using quite complex logic. For example,
>> >> >
>> >> > IF
>> >> > (
>> >> > (
>> >> > (Person.Age > 35 OR Person.Age < 25) AND
>> >> > (Person.ZipCode =23546 or Person.ZipCode = 68590)
>> >> > )
>> >> > and
>> >> > (
>> >> > (Person.LastOrderPrice > 300 OR
>> >> > (Person.TotalOrderNumber > 2)
>> >> > )
>> >> > )
>> >> > OR
>> >> > (
>> >> > (
>> >> > (Person.LastOrderCategory in ("098", "109") ) AND
>> >> > (Person.ZipCode =74567 or Person.ZipCode = 23765)
>> >> > )
>> >> > and
>> >> > (
>> >> > (Person.LastOrderPrice > 1000 OR
>> >> > (Person.TotalOrderNumber > 1)
>> >> > )
>> >> > )
>> >> > ...
>> >> >
>> >> > THEN Person.Status = "KT";
>> >> >
>> >> > Before I set out to write the builder, I would like to know whether
>> >> > the new syntax can handle the above logic? Also, where can I find
>> >> > document for the new syntax?
>> >> >
>> >> > I am also trying to find some existing open source Java library to
>> >> > "flatten out" these complex logic - to break these complex logic to
>> >> > atomic ones that can be handled by Drools. Do you have any
>> >> > recommendation?
>> >> >
>> >> > Thanks a lot for your help.
>> >> >
>> >> > Bill Y.
>> >> >
>> >> >
>> >> >
>> >> >
>> >> > On 2/19/07, Alexander Varakin <avarakin at optonline.net> wrote:
>> >> >
>> >> >> We built a Rule Builder which creates drl with all possible
>> >> >> combinations. In any case, drl syntax is not exactly business user
>> >> >> friendly, so having such builder is not a bad idea.
>> >> >> Simple Rule Builder can be implemented as an Excel spreadsheet,
>> which
>> >> >> can be easily parsed using POI library and then drl file produced.
>> >> >>
>> >> >> Steven Williams wrote:
>> >> >> > Hi Bill,
>> >> >> >
>> >> >> > To implement your rules in 3.0.5 you would need to implement
>> a rule
>> >> >> > for each combination of age and zipCode.
>> >> >> >
>> >> >> > $a : Person(age > 35 zipCode == 23546)
>> >> >> > then
>> >> >> > $a.setStatus("KT");
>> >> >> >
>> >> >> > $a : Person(age < 25, zipCode == 23546 )
>> >> >> > then
>> >> >> > $a.setStatus("KT");
>> >> >> >
>> >> >> > $a : Person(age > 35, zipCode == 68590)
>> >> >> > then
>> >> >> > $a.setStatus("KT");
>> >> >> >
>> >> >> > etc..
>> >> >> >
>> >> >> > Steve
>> >> >> >
>> >> >> > On 2/19/07, *Bill Zhang* <billzhang2006 at gmail.com
>> >> >> > <mailto:billzhang2006 at gmail.com>> wrote:
>> >> >> >
>> >> >> > So Alex, if I only want to use the old syntax that is in
>> >> >> production,
>> >> >> > there is no way to implement my seemingly simple logic
>> >> >> conditioning?
>> >> >> >
>> >> >> > Thanks for your help.
>> >> >> >
>> >> >> > On 2/18/07, Alexander Varakin < avarakin at optonline.net
>> >> >> > <mailto:avarakin at optonline.net>> wrote:
>> >> >> > > As far as I know this syntax is new and is available in
>> SVN
>> >> >> > only, you
>> >> >> > > will have to wait till 3.1 is released or take source from
>> >> SVN
>> >> >> > and build it.
>> >> >> > >
>> >> >> > > Bill Zhang wrote:
>> >> >> > > > Hi Steven,
>> >> >> > > >
>> >> >> > > > Thank you very much for your help. Really appreciate.
>> >> >> > > >
>> >> >> > > > I still got the same error, Unexpected token '|'. I
>> did not
>> >> >> > see "|" in
>> >> >> > > > the document, only saw "||", which is supposed to be
>> >> used with
>> >> >> > > > columns.
>> >> >> > > >
>> >> >> > > > Ye
>> >> >> > > >
>> >> >> > > > On 2/18/07, Steven Williams <
>> >> stevenw at objectconsulting.com.au
>> >> >> > <mailto:stevenw at objectconsulting.com.au>> wrote:
>> >> >> > > >> Hi Bill,
>> >> >> > > >>
>> >> >> > > >> I think it should be:
>> >> >> > > >>
>> >> >> > > >> $a : Person(age > 35 | < 25, zipCode == 23546 | ==
>> 68590)
>> >> >> > > >>
>> >> >> > > >> Edson, Mark or Michael can probably confirm or
>> correct the
>> >> >> > above syntax.
>> >> >> > > >>
>> >> >> > > >> Make sure you are running of the latest trunk.
>> >> >> > > >>
>> >> >> > > >> cheers
>> >> >> > > >> Steve
>> >> >> > > >>
>> >> >> > > >>
>> >> >> > > >> On 2/18/07, Bill Zhang <billzhang2006 at gmail.com
>> >> >> > <mailto:billzhang2006 at gmail.com>> wrote:
>> >> >> > > >> >
>> >> >> > > >> > I tried:
>> >> >> > > >> >
>> >> >> > > >> > $a : Person(age > 35 || age < 25, zipCode == 23546
>> || ==
>> >> >> 68590)
>> >> >> > > >> >
>> >> >> > > >> > Errors:
>> >> >> > > >> > org.drools.rule.InvalidRulePackage : unknown:39:30
>> >> >> > > >> Unexpected token '||'
>> >> >> > > >> > unknown:39:40 mismatched token:
>> >> >> > > >> [@246,1040:1041='<=',<47>,39:40];
>> >> >> > > >> > expecting type '('
>> >> >> > > >> > unknown:39:92 mismatched token:
>> >> >> > > >> [@258,1092:1092='<',<46>,39:92];
>> >> >> > > >> > expecting type '('
>> >> >> > > >> >
>> >> >> > > >> > I also tried
>> >> >> > > >> >
>> >> >> > > >> > $a : Person(age > 35 | age < 25, zipCode == 23546
>> | ==
>> >> >> 68590)
>> >> >> > > >> >
>> >> >> > > >> > Pretty much the same error.
>> >> >> > > >> >
>> >> >> > > >> > Based on the document, "||" is only valid for
>> columns...
>> >> >> > > >> >
>> >> >> > > >> >
>> >> >> > > >> > On 2/17/07, Bill Zhang <billzhang2006 at gmail.com
>> >> >> > <mailto:billzhang2006 at gmail.com>> wrote:
>> >> >> > > >> > > Thank you Steve. But I got syntax error using the
>> >> >> following.
>> >> >> > > >> > >
>> >> >> > > >> > > On 2/17/07, Steven Williams
>> >> >> > <stevenw at objectconsulting.com.au
>> >> >> > <mailto:stevenw at objectconsulting.com.au>> wrote:
>> >> >> > > >> > > > In trunk I think you can use connective
>> constraints:
>> >> >> > > >> > > >
>> >> >> > > >> > > > $a : Person(age > 35 | < 25, zipCode == 23546
>> | ==
>> >> >> 68590)
>> >> >> > > >> > > > then
>> >> >> > > >> > > > $a.setStatus("KT");
>> >> >> > > >> > > >
>> >> >> > > >> > > >
>> >> >> > > >> > > >
>> >> >> > > >> > > >
>> >> >> > > >> > > > On 2/18/07, Bill Zhang < billzhang2006 at gmail.com
>> >> >> > <mailto:billzhang2006 at gmail.com>> wrote:
>> >> >> > > >> > > > >
>> >> >> > > >> > > > > Hello,
>> >> >> > > >> > > > >
>> >> >> > > >> > > > > I am a new Drools user trying to convert the
>> >> >> > following simple
>> >> >> > > >> logic
>> >> >> > > >> into
>> >> >> > > >> > > > DRL:
>> >> >> > > >> > > > >
>> >> >> > > >> > > > > IF (Person.Age > 35 OR Person.Age < 25) AND
>> >> >> > (Person.ZipCode =
>> >> >> > > >> 23546
>> >> >> > > >> or
>> >> >> > > >> > > > > Person.ZipCode = 68590)
>> >> >> > > >> > > > > THEN
>> >> >> > > >> > > > > Person.Status = "KT";
>> >> >> > > >> > > > >
>> >> >> > > >> > > > > I found that it is not easy to convert the
>> above
>> >> >> > logic into
>> >> >> > > >> ONE DRL
>> >> >> > > >> rule.
>> >> >> > > >> > > > >
>> >> >> > > >> > > > > I tried something like this
>> >> >> > > >> > > > >
>> >> >> > > >> > > > > when
>> >> >> > > >> > > > > $a: Person(age>35) or Person (age<25)
>> >> >> > > >> > > > > $b: Person(Zipcode==23456) or Person
>> (ZipCode ==
>> >> >> 68590)
>> >> >> > > >> > > > > $c: $a and $b
>> >> >> > > >> > > > > Then
>> >> >> > > >> > > > > $c.setStatus("KT")
>> >> >> > > >> > > > >
>> >> >> > > >> > > > > But looks like I can not use
>> >> >> > > >> > > > > $c: $a and $b
>> >> >> > > >> > > > > becaue in Drools, you can only bind variable to
>> >> >> > column, not
>> >> >> > > >> to other
>> >> >> > > >> > > > varaibles.
>> >> >> > > >> > > > >
>> >> >> > > >> > > > > Please advise how to do this. I would
>> imagine this
>> >> >> > should be
>> >> >> > > >> quite
>> >> >> > > >> > > > > simple, maybe I missed something quite obvious.
>> >> >> > > >> > > > >
>> >> >> > > >> > > > > I know that I can write custom Java method
>> to do
>> >> >> > this, but if
>> >> >> > > >> I do
>> >> >> > > >> > > > > that, I suppose I lose the power of RETEOO
>> pattern
>> >> >> > matching
>> >> >> > > >> (pattern
>> >> >> > > >> > > > resuing,
>> >> >> > > >> > > > > etc.). So I prefer not to do that.
>> >> >> > > >> > > > >
>> >> >> > > >> > > > > I also understand I can break the above logic
>> >> into 4
>> >> >> > rules
>> >> >> > > >> and that
>> >> >> > > >> > > > > would be quite easy, but our business user
>> is not
>> >> >> used to
>> >> >> > > >> think in
>> >> >> > > >> > > > > that way. Also, we have more complex logic than
>> >> the
>> >> >> > above. So
>> >> >> > > >> what I
>> >> >> > > >> > > > > want is to see if there is a way to convert
>> this
>> >> >> > > >> > > > > kind of logic in ONE DRL rule.
>> >> >> > > >> > > > >
>> >> >> > > >> > > > > Thanks in advance.
>> >> >> > > >> > > > >
>> >> >> > > >> > > > > Bill
>> >> >> > > >> > > > > _______________________________________________
>> >> >> > > >> > > > > rules-users mailing list
>> >> >> > > >> > > > > rules-users at lists.jboss.org
>> >> >> > <mailto:rules-users at lists.jboss.org>
>> >> >> > > >> > > > >
>> >> >> > > >> https://lists.jboss.org/mailman/listinfo/rules-users
>> >> >> > > >> > > > >
>> >> >> > > >> > > >
>> >> >> > > >> > > >
>> >> >> > > >> > > >
>> >> >> > > >> > > > --
>> >> >> > > >> > > > Steven Williams
>> >> >> > > >> > > >
>> >> >> > > >> > > > Supervising Consultant
>> >> >> > > >> > > >
>> >> >> > > >> > > > Object Consulting
>> >> >> > > >> > > > Office: 8615 4500 Mob: 0439 898 668 Fax: 8615
>> 4501
>> >> >> > > >> > > > stevenw at objectconsulting.com.au
>> >> >> > <mailto:stevenw at objectconsulting.com.au>
>> >> >> > > >> > > > www.objectconsulting.com.au
>> >> >> > <http://www.objectconsulting.com.au>
>> >> >> > > >> > > >
>> >> >> > > >> > > > consulting | development | training | support
>> >> >> > > >> > > > our experience makes the difference
>> >> >> > > >> > > > _______________________________________________
>> >> >> > > >> > > > rules-users mailing list
>> >> >> > > >> > > > rules-users at lists.jboss.org
>> >> >> > <mailto:rules-users at lists.jboss.org>
>> >> >> > > >> > > >
>> https://lists.jboss.org/mailman/listinfo/rules-users
>> >> >> > > >> > > >
>> >> >> > > >> > > >
>> >> >> > > >> > >
>> >> >> > > >> > _______________________________________________
>> >> >> > > >> > rules-users mailing list
>> >> >> > > >> > rules-users at lists.jboss.org
>> >> >> > <mailto:rules-users at lists.jboss.org>
>> >> >> > > >> > https://lists.jboss.org/mailman/listinfo/rules-users
>> >> >> > > >> >
>> >> >> > > >>
>> >> >> > > >>
>> >> >> > > >>
>> >> >> > > >> --
>> >> >> > > >> Steven Williams
>> >> >> > > >>
>> >> >> > > >> Supervising Consultant
>> >> >> > > >>
>> >> >> > > >> Object Consulting
>> >> >> > > >> Office: 8615 4500 Mob: 0439 898 668 Fax: 8615 4501
>> >> >> > > >> stevenw at objectconsulting.com.au
>> >> >> > <mailto:stevenw at objectconsulting.com.au>
>> >> >> > > >> www.objectconsulting.com.au
>> >> >> <http://www.objectconsulting.com.au>
>> >> >> > > >>
>> >> >> > > >> consulting | development | training | support
>> >> >> > > >> our experience makes the difference
>> >> >> > > >> _______________________________________________
>> >> >> > > >> rules-users mailing list
>> >> >> > > >> rules-users at lists.jboss.org
>> >> >> <mailto:rules-users at lists.jboss.org>
>> >> >> > > >> https://lists.jboss.org/mailman/listinfo/rules-users
>> >> >> > > >>
>> >> >> > > >>
>> >> >> > > > _______________________________________________
>> >> >> > > > rules-users mailing list
>> >> >> > > > rules-users at lists.jboss.org
>> >> >> <mailto:rules-users at lists.jboss.org>
>> >> >> > > > https://lists.jboss.org/mailman/listinfo/rules-users
>> >> >> > <https://lists.jboss.org/mailman/listinfo/rules-users>
>> >> >> > > >
>> >> >> > >
>> >> >> > > _______________________________________________
>> >> >> > > rules-users mailing list
>> >> >> > > rules-users at lists.jboss.org
>> >> <mailto:rules-users at lists.jboss.org>
>> >> >> > > https://lists.jboss.org/mailman/listinfo/rules-users
>> >> >> > >
>> >> >> > _______________________________________________
>> >> >> > rules-users mailing list
>> >> >> > rules-users at lists.jboss.org
>> >> <mailto:rules-users at lists.jboss.org>
>> >> >> > https://lists.jboss.org/mailman/listinfo/rules-users
>> >> >> >
>> >> >> >
>> >> >> >
>> >> >> >
>> >> >> > --
>> >> >> > Steven Williams
>> >> >> >
>> >> >> > Supervising Consultant
>> >> >> >
>> >> >> > Object Consulting
>> >> >> > Office: 8615 4500 Mob: 0439 898 668 Fax: 8615 4501
>> >> >> > stevenw at objectconsulting.com.au
>> >> >> <mailto:stevenw at objectconsulting.com.au>
>> >> >> > www.objectconsulting.com.au <http://www.objectconsulting.com.au>
>> >> >> >
>> >> >> > consulting | development | training | support
>> >> >> > our experience makes the difference
>> >> >> >
>> >> >>
>> >>
>> ------------------------------------------------------------------------
>> >> >> >
>> >> >> > _______________________________________________
>> >> >> > 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
>> >> >>
>> >> > _______________________________________________
>> >> > rules-users mailing list
>> >> > rules-users at lists.jboss.org
>> >> > https://lists.jboss.org/mailman/listinfo/rules-users
>> >> >
>> >>
>> >>
>> >> --
>> >> Edson Tirelli
>> >> Software Engineer - JBoss Rules Core Developer
>> >> Office: +55 11 3124-6000
>> >> Mobile: +55 11 9218-4151
>> >> JBoss, a division of Red Hat @ www.jboss.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
>> >
>>
>>
>> --
>> Edson Tirelli
>> Software Engineer - JBoss Rules Core Developer
>> Office: +55 11 3124-6000
>> Mobile: +55 11 9218-4151
>> JBoss, a division of Red Hat @ www.jboss.com
>>
>>
>> _______________________________________________
>> rules-users mailing list
>> rules-users at lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
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