[rules-users] some pointers for solution

[Wishing Carebear]

Thanks for your reply Greg.

Actually I have 2 requirements:

1) Define the data objects in the rule itself so that the business user can
define\modify the data objects
2) have a rule that can evalaute the data objects against the criteria the
user requests..

It is my bad I started with the 2nd requirement :(

Regards,
cabear
On Wed, Nov 11, 2009 at 1:50 PM, Greg Barton <greg_barton at yahoo.com> wrote:

> Funny you should bring that up, I was just having this debate with a
> co-worker. :)
>
> A decision table is a means for defining rules, not working memory objects.
>  So no, out of the box a decision table as it's defined in drools (and other
> rule management systems) would not serve that purpose.  However, there's no
> reason why you couldn't parse a spreadsheet (or other tabular data format)
> to generate Data objects.
>
> Now, are you sure it's Data objects you want to generate?  I'm guessing
> from how your question was phrased that it's Query objects you'd like to
> generate.  In that case the answer to the question is still no, but...if you
> use Wolfgang's approach to solve the problem (i.e. defining the queries in
> the rules themselves, and not in a working memory object) then using a
> decision table is appropriate.  In fact, it's probably the best way to
> define the rules. (It's most compact and readable when you have many rules
> with a repetitive structure.)
>
> --- On Wed, 11/11/09, Wishing Carebear <wishing.carebear at gmail.com> wrote:
>
> > From: Wishing Carebear <wishing.carebear at gmail.com>
> > Subject: Re: [rules-users] some pointers for solution
> > To: "Rules Users List" <rules-users at lists.jboss.org>
> > Date: Wednesday, November 11, 2009, 3:38 PM
>  > Hi Greg:
> > Is it possible to use decision table to populate the
> > Data object that contains the criteria list
> > information.
> >
> > Thanks,
> > Ravi
> >
> >
> > 2009/11/8 Greg Barton <greg_barton at yahoo.com>
> >
> > There
> > are a couple of ways to do this.  I'm sure there's
> > a bit more clean way than the example I'm providing, but
> > this should get you in the right direction.  It's not
> > 100% rules, because it involves a bit of java collections
> > trickery. (See attached project,
> > collection_DroolsCriteriaMatch.tar.gz)
> >
> >
> > The heart of it is a single rule:
> >
> > rule "Match"
> >  when
> >    d : Data()
> >    q : Query( size <= d.size )
> >    Number( intValue == q.size )
> >    from accumulate(
> >      Criteria( this memberOf d, this memberOf q ),
> >
> >      init( int total = 0; ),
> >      action( total ++; ),
> >      reverse( total --; ),
> >      result( total )
> >    )
> >  then
> >    System.out.println("Match: " + d + "
> > and " + q) ;
> > end
> >
> > The Data object holds data to be queried, Query objects are
> > asserted to match the Data, and Criteria objects can be
> > contained in either. (With the aforementioned collections
> > trickery that if a Criteria is contained in a Query it can
> > be found in a Data object, but the reverse isn't true.
> >  See the Query.contains(Object) method for how that's
> > implemented.)
> >
> >
> > So the rule above basically says "There's a Data
> > object, and all of the Query objects Criteria are contained
> > in the Data object."
> >
> > There's an alternate way of doing this using eval and a
> > bit more java fu.  See the eval_DroolsCriteriaMatch.tar.gz
> > project attached.  This one's probably not optimal,
> > though, as it's basically a brute force check of all
> > Data objects against the asserted Query.
> >
> >
> > I tried for a while to get a solution working with
> > different criteria types from both Data and Query objects
> > being asserted into working memory, but I couldn't get
> > the accumulate syntax right.  Anyone know of a way to do
> > that? (I figure that would get a "pure rules"
> > solution.)
> >
> >
> > --- On Sat, 11/7/09, Wishing Carebear <wishing.carebear at gmail.com>
> > wrote:
> >
> > > From: Wishing Carebear <wishing.carebear at gmail.com>
> >
> > > Subject: [rules-users] some pointers for solution
> > > To: rules-users at lists.jboss.org
> > > Date: Saturday, November 7, 2009, 10:19 PM
> >
> >
> >
> > > Hello:
> > > There are n selection criteria from s1 .. sn for each
> > > item i1.. in. Each item can have a subset of criteria
> > which
> > > applies to them.
> > >
> > > The end user, can choose a subset of criteria like c1
> >
> > > and c5 and only the item that has c1 and c5 valid
> > should be
> > > returned. For example: if item i1 and i2 have
> > criterias
> > > valid for c1, c2, c5, c6, c8 since the request is only
> > for
> > > criteria c1 and c5, i1 and i2 must be returned.
> >
> > >
> > >
> > > Is it possible to write a rule using drools for this
> > > requirement.
> > >
> > > Thanks for your help and time,
> > > cabear
> > >
> > > -----Inline Attachment Follows-----
> >
> > >
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> >
> > >
> >
> >
> >
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> >
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> >
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> >
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