Re: [rules-users] Creating objects in WHEN clause

I'd second this idea, and to get around the inconcenience of inserting the Quantity objects from the calling application, use a rule that fires once on initialization. rule no-loop true when //No condition then insert(new Quantity("m", 2)); end This rule should fire first. You could also put it in it's own agenda-group (call it "initialization" or some such) and set focus to that group when starting. rule agenda-group "initialization" no-loop true when //No condition then insert(new Quantity("m", 2)); drools.setFocus("whatever_your_next_group_is"); end --- On Wed, 2/25/09, Mauricio Salatino <salaboy(a)gmail.com&gt; wrote: > From: Mauricio Salatino <salaboy(a)gmail.com&gt; > Subject: Re: [rules-users] Creating objects in WHEN clause > To: "Rules Users List" <rules-users(a)lists.jboss.org&gt; > Date: Wednesday, February 25, 2009, 11:40 AM > How about : > WHEN > $quantity: Quantity(value == 2, unit == "m") > $Person($height == $quantity:) > then > ... > > > > On Wed, Feb 25, 2009 at 2:27 PM, David Boaz > <davidb(a)dbmotion.com&gt; wrote: > > > > In my application, we often compare the fact's > field values against a known > > object. For example: > > WHEN person(height> new Quantity(2, "m")) > // the height is greater than 2 > > meters. > > will DROOLS create a "singleton" Quantity > object, or will it create one > > object for each fact evaluation? > > > > We consider using anoter approach, using GLOBALS. > Then, the Quantity object > > will be created applicatively, and passed by the API > to the engine. > > something like: > > GLOBAL Quantity 2meters > > WHEN person(height > 2meters) > > But this approach is combersom, because the rule > author has to define part > > of the information in the calling application, and > part in the rule. > > > > Do you have a good practice how to handle these > situations? > > > > Thanks, David > > -- > > View this message in context: > http://www.nabble.com/Creating-objects-in-WHEN-clause-tp22207616p22207616... > > Sent from the drools - user mailing list archive at > Nabble.com. > > > > _______________________________________________ > > rules-users mailing list > > rules-users(a)lists.jboss.org > > https://lists.jboss.org/mailman/listinfo/rules-users > > > > > > -- > - Salatino Mauricio - > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users