Hey,
I saw your message too. However, I am so busy this week that I can not
devote any time to JBoss.
As I understand Rule engines are some sort of interpreter for if-then-else
logic. I assume that they are going to be used mostly in business logic of
your beans. I assume that instead of some if-then-else spaghetti , rule
engine intercepts state mutations of an object , checks the rules against
it and fires the rule event.
Is this right?
Some good intro I found here: www.haley.com
Also there is jsr 94 about rule engine.
Vlada
On 2001.04.18 19:54 David Jencks wrote:
> Hi,
> At least one person saw my message.
> Thats one of the questions I was asking. A couple of months ago Marc
> suggested someone write a rule engine integration for jboss, so I
> volunteered. Although there is a java community process group working on
> an integration standard, I couldn't find out what they're up to, and I've
> had little luck finding out what kind of rules people might want to use.
> Any references or information or examples would be greatly appreciated.
>
> Thanks
> David Jencks
> On 2001.04.18 16:27:50 -0400 Jason Dillon wrote:
> > What is a rule engine used for in real world applications? Could you
> > give
> > an example (other than "compute factorials and fibonacci numbers")?
> >
> > --jason
> >
> > On Wed, 18 Apr 2001, David Jencks wrote:
> >
> > > Hi,
> > >
> > > I am pleased to announce that I have a working rule engine
> integration
> > > between JBoss and JEOPS (http://sourceforge.net/projects/jeops/). I
> > have
> > > made the source available at http://home.earthlink.net/~davidjencks/.
> > > There are tar.gz and zip versions. Please follow the instructions in
> > the
> > > README. You may need to change executable permissions on some
> scripts
> > to
> > > get the examples to run.
> > >
> > > I would greatly appreciate all feedback positive and negative, and
> > examples
> > > of how a rule engine could be useful. The examples I have so far are
> > > derived from the jeops examples, and are a bit artificial for ejb:
> they
> > > compute factorials and fibonacci numbers. They do serve as an
> example
> > of
> > > essentially computing a transitive closure, not possible with simple
> > > queries.
> > >
> > > This implementation is similar to database triggers, in that rule
> > engine
> > > interaction is not coded explicitly but triggered by calling an ejb
> > method:
> > > an interceptor detects the call and passes it to the rule engine.
> > >
> > > The implementation is fully transactional: all work (including
> creating
> > new
> > > beans, etc) is done within the original transaction provided by the
> > > original method call. ( A REQUIRES_NEW call in the middle of rule
> > engine
> > > work will get a separate rule engine instance, not interfering with
> the
> > > original transaction).
> > >
> > > Jeops is somewhat unusual among rule engines in that rather than
> > operating
> > > on tuples of values and interpreting rules, it operates on java
> objects
> > (in
> > > this case remote interfaces) and compiles the rules into a java
> class.
> > >
> > > The main problem I am aware of at this time is that the
> implementation
> > is
> > > extremely slow. This is only partly due to the very large amount of
> > > logging information generated. I have not yet investigated how to
> > speed
> > > things up.
> > >
> > > Please, try it out, tell me how it works, and what more is needed.
> > >
> > >
> > > Thanks
> > > David Jencks
> > >
> > >
> > > _______________________________________________
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> > >
> >
> >
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> >
>
>
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