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Date: Mon, 20 Aug 2007 17:53:03 +0200
From: "=3D?ISO-8859-1?Q?No=3DEBl_Huebers?=3D" =
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Subject: Re: JESS: Java objects
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Thanks for your answers! I wanted to use the counter template and rule =
to
count facts of the same kind, e.g. an event in my system.
First of all, I added a slot with a unique value in order to facts of =
the
same kind.
I solved the counting with a query and a function:
(defquery searchcontext
(declare (variables ?name ?task ?val))
(context
(username ?name)
(action "Bewertet")
(task ?task)
(value ?val)))
(deffunction checkformerattempts(?n ?t ?v)
(bind ?results (count-query-results searchcontext ?n ?t ?v))
(return ?results)
(close ?results))
Now I want to delete the some facts. How do I get a fact from the
queryresult '?result' ?
;(deffunction delformerattempts(?n ?t ?v)
; (bind ?results (run-query* searchcontext ?n ?t ?v))
; (while (?results next))
; (retract ?results get))
Best regards,
Noel H=3DFCbers
2007/8/20, Wolfgang Laun <[EMAIL PROTECTED]>:
>
> No=3DEBl Huebers wrote:
>
> >Hi,
> >
> >I'm new to the Jess language and have some questions.
> >
> >1. I work with Java object. I stored them in Jess with store and
> >assert/fetch commands.
> >But I could not call there member in the lhs of my rule. No function
> calls
> >allowed, right? So, for every object I made a rule to insert a Jess
> >template. This works fine, but is this way of mapping Java objects to
> Jess
> >facts and then discarding the object the best way to work with java
> objects?
> >
> >
> store and fetch are just a way of storing and retrieving arbitrary =
data.
> If you want to use Java objects in rules, look into the topic of =
shadow
> facts, see section 5.3. Shadow facts: reasoning about Java objects.
>
> >2. I am trying to implement a counter-logic for specific slot
> combinations.
> >First, everytime a fact is inserted I check if there is already a
> procounter
> >fact. If not I create one. This works fine. The next rule should
> recognize
> >when a fact (EContext) is inserted and the counter (procounter) =
already
> >exists. In this case, the count slot should only be modified. I try =
to
> >compare bounded vars ?s ?v ?t from EContext to procounter slots, but =
I
> think
> >Jess simply overwrites the binding. Can you help me with the correct
> syntax?
> >Is there a better logic to implement a counter?
> >
> If you have one fact (EContext (studentname "Max") (action
> "bewertet")(value "3")(task "Thesis")) it won't be possible to ever
> assert another fact just like this one. This might be the cause of
> modpro failing to fire. Consider adding another slot to EContext such =
as
> a date or time stamp, and then you might see an increase. Notice that
> the rule might benefit from adding the option (declare (no-loop =
TRUE)).
>
> >
> >Best regards,
> >
> >Noel Huebers
> >
> >***CODE***
> >
> >(defrule modpro ; counter erh=3DF6hen
> > (and
> > (EContext
> > (studentname ?s)
> > (action "bewertet")
> > (value ?v)
> > (task ?t))
> > ?pro <- (procounter
> > (name ?s)
> > (task ?t)
> > (val ?v)
> > (count ?x))
> > )
> >=3D3D>
> >(modify ?pro
> > (count (+ ?x 1))) ;increase counter
> >(printout t "Counter f=3DFCr " ?s ?t ?v " erh=3DF6hen!!!" crlf))
> >
> >
> >
>
>
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