This appears to be an "incremental reset" bug. The term "incremental
reset" refers to the special processing that has to be done to bring
a rule up to date if it's added to an already-populated working
memory. Jess expects you to do things the other way around: compile
the Rete network by defining all the rules, and then push the data
through it; and indeed, if you move your "reset" to after the rules
are defined, they both fire correctly.
Thanks for the report; we'll look into this further and get it fixed.
On Jun 27, 2007, at 10:34 AM, Wolfgang Laun wrote:
In the program below, Jess will only fire the second rule if both
are uncommented, but each of them fires if the other one isn't
there. If the order of rule definitions is reversed, the second one
"wins" again.
Jess Version 7.0p1
Kind regards
Wolfgang
(clear)
(deftemplate Obj
(slot id (type STRING))
)
(deftemplate Room extends Obj
(slot occupied (type SYMBOL)(default false)) ; Boolean
)
(deftemplate Suite extends Room
(slot rooms (type INTEGER)))
(deftemplate Single extends Room)
(deftemplate Double extends Room)
(deftemplate NextTo
(slot room1 (type STRING))
(slot room2 (type STRING))
)
(deffacts fact-23
(Suite (id "100") (rooms 3))
(Single (id "101"))
(Double (id "102"))
(Double (id "103"))
(NextTo (room1 "100")(room2 "101"))
(NextTo (room1 "101")(room2 "100"))
(NextTo (room1 "101")(room2 "102"))
(NextTo (room1 "102")(room2 "101"))
(NextTo (room1 "102")(room2 "103"))
(NextTo (room1 "103")(room2 "102"))
)
(reset)
;;/***
(defrule oneNext
"Check that a suite has exactly one neighbour."
(Suite (id ?rid))
?sn <- (accumulate (bind ?xcount 0) (++ ?xcount) ?xcount
(NextTo (room1 ?rid)))
(test (= ?sn 1))
=>
(printout t "===> Suite " ?rid " has " ?sn " neighbours." crlf)
)
;;***/
;;/***
(defrule maxNext
"Check that no room is next to three or more."
(Room (id ?rid))
?nc <- (accumulate (bind ?count 0) (++ ?count) ?count
(NextTo (room1 ?rid)))
(test (<= ?nc 2))
=>
(printout t "---> " ?rid " has " ?nc " neighbours." crlf)
)
;;***/
(run)
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