RE: [rules-users] Convert logic to DRL rules

Monday, 19 February 2007

I guess if you modify the business objects a bit (in quite weird way - I
think it would be rather a shortcut than a solution) you can implement this
kind of logic: you need to swap property (zipcode, age, etc) and 'property
ownner' (Person) objects, so that you'll have:

Person (id)
ZipCode (id, code)
Age (id, age)
Etc

In this case you should be able to write:

Rule X
When
	$p: Person($id: id)
	(
		ZipCode(id == $id, code == "23456")
	   or ZipCode(id == $id, code == "68590")
	)
	And
	(
		Age(id == $id, age < 25)
	   Or Age(id == $id, age > 34)
	)
Then
	// do smth using $p
End

Or smth along those lines... Would that work?.....

Vlad

-----Original Message-----
From: rules-users-bounces(a)lists.jboss.org
[mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Bill Zhang
Sent: 19 February 2007 09:14
To: Rules Users List
Subject: Re: [rules-users] Convert logic to DRL rules

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(a)optonline.net&gt; 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(a)gmail.com
 > <mailto:billzhang2006@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(a)optonline.net
 >     <mailto:avarakin@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(a)objectconsulting.com.au
 >     <mailto:stevenw@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(a)gmail.com
 >     <mailto:billzhang2006@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(a)gmail.com
 >     <mailto:billzhang2006@gmail.com>> wrote:
 >     > >> > > Thank you Steve. But I got syntax error using the
following.
...
 >     > >> > >
 >     > >> > > On 2/17/07, Steven Williams
 >     <stevenw(a)objectconsulting.com.au
 >     <mailto:stevenw@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(a)gmail.com
 >     <mailto:billzhang2006@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(a)lists.jboss.org
 >     <mailto:rules-users@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(a)objectconsulting.com.au
 >     <mailto:stevenw@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(a)lists.jboss.org
 >     <mailto:rules-users@lists.jboss.org>
 >     > >> > > >
https://lists.jboss.org/mailman/listinfo/rules-users
 >     > >> > > >
 >     > >> > > >
 >     > >> > >
 >     > >> > _______________________________________________
 >     > >> > rules-users mailing list
 >     > >> > rules-users(a)lists.jboss.org
 >     <mailto:rules-users@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(a)objectconsulting.com.au
 >     <mailto:stevenw@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(a)lists.jboss.org
<mailto:rules-users@lists.jboss.org>
...
 >     > >>
https://lists.jboss.org/mailman/listinfo/rules-users
 >     > >>
 >     > >>
 >     > > _______________________________________________
 >     > > rules-users mailing list
 >     > > rules-users(a)lists.jboss.org
<mailto:rules-users@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(a)lists.jboss.org <mailto:rules-users@lists.jboss.org>
 >     > https://lists.jboss.org/mailman/listinfo/rules-users
 >     >
 >     _______________________________________________
 >     rules-users mailing list
 >     rules-users(a)lists.jboss.org <mailto:rules-users@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(a)objectconsulting.com.au <mailto:stevenw@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(a)lists.jboss.org
 > https://lists.jboss.org/mailman/listinfo/rules-users
 >

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