[rules-users] Object updated as rules are running
Vincent Legendre
vincent.legendre at eurodecision.com
Fri Feb 25 12:21:40 EST 2011
To notify modifications, use "update" operator. This action will notify
all rules using this object instance to re-evaluate. So the second rule
will trigger, but also the first one if you don't check that MovieStar
has its default value in your conditions. Without this check, you will
fall in infinite loop.
You should read the documentation more carefully.
Your question is on very basic concepts of a rule enine.
Le 25/02/2011 17:54, Jon Gil a écrit :
> Can you please provide the syntax or point me in the direction of an
> example?
>
> 2011/2/25 Greg Barton <greg_barton at yahoo.com
> <mailto:greg_barton at yahoo.com>>
>
> It's done in the rule action of the first rule. If you don't
> inform the engine that the object has updated the second rule
> can't know about it.
>
>
> --- On *Fri, 2/25/11, Jon Gil /<jonsprogrammingemail at gmail.com
> <mailto:jonsprogrammingemail at gmail.com>>/* wrote:
>
>
> From: Jon Gil <jonsprogrammingemail at gmail.com
> <mailto:jonsprogrammingemail at gmail.com>>
> Subject: Re: [rules-users] Object updated as rules are running
> To: "Rules Users List" <rules-users at lists.jboss.org
> <mailto:rules-users at lists.jboss.org>>
> Date: Friday, February 25, 2011, 10:14 AM
>
>
> How do we do that? Since we are using the rules server, all
> we are doing is calling with an HTTP call with the object and
> the rules flow we want to call. We then receive back the
> results as the HTTP response.
>
> 2011/2/25 Greg Barton <greg_barton at yahoo.com
> <http://mc/compose?to=greg_barton@yahoo.com>>
>
> Did you notify the engine that your data has been updated?
>
> http://downloads.jboss.com/drools/docs/5.1.1.34858.FINAL/drools-expert/html_single/index.html#d0e1436
>
> See section 3.3.3.1.3
>
> --- On *Fri, 2/25/11, Jon Gil
> /<jonsprogrammingemail at gmail.com
> <http://mc/compose?to=jonsprogrammingemail@gmail.com>>/*
> wrote:
>
>
> From: Jon Gil <jonsprogrammingemail at gmail.com
> <http://mc/compose?to=jonsprogrammingemail@gmail.com>>
> Subject: [rules-users] Object updated as rules are running
> To: rules-users at lists.jboss.org
> <http://mc/compose?to=rules-users@lists.jboss.org>
> Date: Friday, February 25, 2011, 9:16 AM
>
>
> Hi, I have a very simple rules flow that I am getting
> odd results from. For now, our project is planning on
> using spreadsheets and a drools server.
> The test project we are working on accepts a movie
> name from an external source and creates a
> Movie object that is passed to the rules. The first
> rule looks at the movieName attribute and assigns it a
> movieStar using the Movie objects setMovieStar call.
> We have printLn statements before and after this
> action to confirm that it does in fact work.
> The second rule, where things go wrong, checks the
> MovieStar attribute, but no matter what we've just set
> it to, it always uses the value ("NoStarYet") that was
> originally created when we create the Movie object in
> our Java code in the condition of our second rule.
> We've tried using the getMovieStar call in the
> condition, but it has been throwing errors when we
> startup the Drools Server.
> When we retreive the Movie object from the resultSet,
> the movieStar attribute is set correclty, but we can't
> get our flow to go as expected.
> This really seems like a simple issue, but we've had
> no luck with it. Any thoughts? Does the rules engine
> use the getter methods for conditions or does it use
> the values from the entityXML we pass in? Is there a
> way to make the engine update the object between
> running each rule?
> Any help is appreciated greatly.
>
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--
Vincent LEGENDRE
/Consultant Sénior/
EURODECISION
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