[rules-users] Using Drools for modeling with rule-driven agents

[Andrew Waterman]

Hi Russ,

We are using Drools for games based on participatory modeling work  
here in Chiapas.  Our games have agents that participate against human  
players (or they could play each other in a typical multi-agent system  
if we wanted).  I use JMS to broadcast updates to the games; our  
agents just need to listen to a JMS stream, create an environmental  
context (or update one) from serialized objects in the messaging layer  
and then fire rules against that context.  Any kind of messaging layer  
should provide a similar functionality.

best wishes,

Andrew

---------------------------------
Andrew Waterman
San Cristóbal de las Casas, Chiapas, Mexico









El 23/08/2009, a las 12:13 a.m., Russ Abbott escribió:

> Thanks Greg, That sounds quite promising.  I've never used Drools  
> and can't say how the Rete network will be organized. In fact,  
> before your message I wasn't aware that Drools allows multiple Rete  
> networks. If that's the case it seems to make a lot of sense for  
> each agent to have its own. Since the agents are supposed to be  
> individual and disjoint I was imagining that I'd have to code an  
> agent's id into its rules to limit those rules from being applied to  
> other agents. But multiple Rete networks sounds much much better!   
> It would be even better if each agent could run its rules  
> asynchronously in its own thread. Is something like that possible:  
> multiple threads of rule evaluators running on a single workspace?
>
> -- Russ
>
>
>
> On Sat, Aug 22, 2009 at 9:26 PM, Greg Barton <greg_barton at yahoo.com>  
> wrote:
> Yes, rules can be manipulated at runtime.  The class  
> org.drools.RuleBase has methods for adding Packages and removing  
> Packages and individual rules, and can be called at runtime as  
> demonstrated by Mark in this jira post:
>
> https://jira.jboss.org/jira/browse/JBRULES-1431
>
> I haven't tried it myself, but now that the subject has come up I  
> probably will. :)
>
> As for the best approach to do this, I'd suggest that you have your  
> own rule representation that generates DRL, then compile that DRL in  
> the standard way using the PackageBuilder.  On first blush it may  
> seem best or more elegant to try creating Rule objects directly,  
> circumventing the PackageBuilder, but that's a waste of time in my  
> opinion. (The main focus for support from the drools team is the  
> language and other "external" parts of the system.)
>
> So, how will agents interact in your system?  Will each have it's  
> own rete network?  Or will several agents share a rete?
>
> --- On Sat, 8/22/09, Russ Abbott <russ.abbott at gmail.com> wrote:
>
> > From: Russ Abbott <russ.abbott at gmail.com>
> > Subject: Re: [rules-users] Using Drools for modeling with rule- 
> driven agents
> > To: "Greg Barton" <greg_barton at yahoo.com>
> > Cc: rules-users at lists.jboss.org, "Antony W. Iorio" <antony.iorio at gmail.com 
> >, "HusseinAbbass" <h.abbass at adfa.edu.au>
> > Date: Saturday, August 22, 2009, 10:15 PM
> > That's a possibility. But the
> > underlying capability comes first. Can we do it in Drools?
> > Has anyone done it, and if so would you be willing to share
> > your experience?
> >
> > -- Russ
> >
> >
> >
> > On Sat, Aug 22, 2009 at 6:50 PM,
> > Greg Barton <greg_barton at yahoo.com>
> > wrote:
> >
> >
> > This wouldn't happen to involve evolutionary pressures
> > altering rules, would it?
> >
> >
> >
> > --- On Sat, 8/22/09, Russ Abbott <russ.abbott at gmail.com>
> > wrote:
> >
> >
> >
> > > From: Russ Abbott <russ.abbott at gmail.com>
> >
> > > Subject: [rules-users] Using Drools for modeling with
> > rule-driven agents
> >
> > > To: rules-users at lists.jboss.org
> >
> > > Cc: "Antony W. Iorio" <antony.iorio at gmail.com>,
> > "Abbass, Hussein" <h.abbass at adfa.edu.au>
> >
> > > Date: Saturday, August 22, 2009, 5:52 PM
> >
> > >
> >
> > > Hi,
> >
> > >
> >
> > > I'm interested in developing (if it doesn't
> > already
> >
> > > exist) and then using a framework for agent-based
> > modeling
> >
> > > in which the agents are rule driven. An important
> > feature is
> >
> > > that the agents and their rules must be dyanically
> >
> > > manipulable. That is, both the agents and the rules
> > must be
> >
> > > first class objects that can be manipulated as the
> > system is
> >
> > > running. Can Drools support that?
> >
> > >
> >
> > >
> >
> > >
> >
> > >
> >
> > > As someone not familiar with Drools I did my best to
> > find
> >
> > > out by looking at the Drools
> >
> > > Expert User's Manual. From what I could tell, the
> > Template
> >
> > > feature in which one uses Java objects as Template
> > data
> >
> > > sources comes close.  I'd like your advice
> > before
> >
> > > putting too much development effort into attempting to
> > use
> >
> > > it for that purpose.
> >
> > >
> >
> > >
> >
> > >
> >
> > >
> >
> > > In particular, would it be possible to set up a
> > mechanism
> >
> > > that could: create and delete agents on the fly;
> > associate
> >
> > > rule sets with agents on the fly; and modify the
> > rules
> >
> > > associated with an agent on the fly?  After each
> > such
> >
> > > action the system would change to reflect the change
> > in
> >
> > > agents and rules.
> >
> > >
> >
> > >
> >
> > >
> >
> > >
> >
> > > Thanks for your help.
> >
> > >
> >
> > > -- Russ Abbott
> >
> > >
> >
> > > P.S. If Drools would not be a good choice, is there
> > some
> >
> > > other system that you could recommend?
> >
> > >
> >
> > >
> >
> > >
> >
> > >
> >
> > > -----Inline Attachment Follows-----
> >
> > >
> >
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> >
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> >
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> >
> > >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
>
>
>
>
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