The current JessDE uses regular Java reflection to learn about the
classes you use, Userfunctions you load, etc. As a result, those
classes get loaded into the JVM. Usually, that doesn't matter, but
some classes do funky things in their static initializer blocks. This
can result in all sorts of odd behavior, depending on exactly what
the classes do; endless loops, out-of-memory errors, etc.
Work has already begun on a future version of the JessDE using
Eclipse's own class file inspection APIs, which don't load the
classes. It's unclear, though, that this will work for Userfunction
classes, as it's only by calling "getName()" on a Userfunction object
that you can learn the name of the implemented function.
On Apr 4, 2007, at 10:54 AM, ebm christoph wrote:
Good Day!
I am working on a Project, where I need to combine Jess with Jade
and Protégé. The problem is, I am having big troubles with the
JessDE eclipse Plug-in, as soon as I use some Protégé functions.
Editing regular jess code works absolutely fine, but when I edit
code, that uses Protégé or JessTab functions, like the following
code, eclipse starts using 99% of my CPU capacity and eventually
freezes completely. This happens after about 1 min of editing and
there is no error message.
This error accurse only while editing the file. Reading or
executing it works absolutely fine.
I experienced the same effect on two different machines, one
running Windows 2000, the other running SuSE Linux. I am using
Eclipse SDK Version: 3.2.2, Jess 7.0p1, JessTab 16 and Protégé 3.2.1.
Any help is highly appreciated!
Christoph Ebm
P.S.: Code, that makes trouble:
(watch all)
(load-package se.liu.ida.JessTab.JessTabFunctions)
(defclass Message_class ; a JADE ACL message mapped to a protege
instance
(is-a :STANDARD-CLASS) ; class Message will inherit the standard
slots
(slot Performative) ; get integer repesenting the type of message
as defined in jade.lang.acl.ACLMessage
(slot Sender (type any)) ; message sender, not a String, but a
JADE AID
(slot Content) ; message content as a String
)
(mapclass Message_class)
(defrule message_rule ; make a protege instance for every message
the agent tells JESS about
?Message <- (Message ?message) ; the agent made this JESS fact
for a message it received
=>
(make-instance of Message_class ; a new protege instance of class
Message
(Performative (call jade.lang.acl.ACLMessage getPerformative (?
message getPerformative)))
(Sender (call (call ?message getSender) getName))
(Content (call ?message getContent))
)
(retract ?Message)
)
(defrule proposal ; example for what the agent could do with a message
(Agent ?agent) ; the agent started with the JADE system
?instance <- (object) ; any protege instance would match here
(test (eq (class ?instance) Message_class)) ; if the instance is
a Message
(test (eq (slot-get ?instance Performative) "CFP")) ; meaning the
message is a call for proposals
=>
(bind ?message (new jade.lang.acl.ACLMessage (get-member
jade.lang.acl.ACLMessage PROPOSE)))
(?message setSender (?agent getAID)) ; take "my" agent as the sender
(?message addReceiver (new jade.core.AID (slot-get ?instance
Sender) TRUE))
(?message setContent (slot-get ?instance Content)) ; just copy
the original content
(?agent send ?message)
)
---------------------------------------------------------
Ernest Friedman-Hill
Advanced Software Research Phone: (925) 294-2154
Sandia National Labs FAX: (925) 294-2234
PO Box 969, MS 9012 [EMAIL PROTECTED]
Livermore, CA 94550 http://www.jessrules.com
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