[rules-users] Convert logic to DRL rules
Bill Zhang
billzhang2006 at gmail.com
Mon Feb 19 13:10:50 EST 2007
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
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>
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