I have a Java object ct_device. ct_object has a Source and Id properties. I want
a rule to fire when I upgrade the objects Id property.
The following is my rule:
(defclass device ct_device)
(defrule rule-4
(device (id ?i) (source ?s))
(test (neq ?i -1))
=>
(printout t "(test.clp rule-4) Source= " ?s ", Id= " ?i crlf)
The following is my Java Code where I set values for Id and Source. Note that I
have a one second delay between the two sets.
ct_device[] d= new ct_device[n];
for (int i= 1; i <= n-1; i++){
d[i].setId(i);
try { Thread.sleep(1000); } catch (InterruptedException ie) { break;
}
d[i].setSource("Device" + i);
}
The above rule fires twice for each object. Once when I set the Id value, and
once when setting the Source property value.
Below is a sample output.
SetId: 1
(test.clp rule-4) Source= default, Id= 1
SetSource: Device1
(test.clp rule-4) Source= Device1, Id= 1
SetId: 2
(test.clp rule-4) Source= default, Id= 2
SetSource: Device2
(test.clp rule-4) Source= Device2, Id= 2
Now, when I remove the one second wait between the two set property values,
i.e.,
ct_device[] d= new ct_device[n];
for (int i= 1; i <= n-1; i++){
d[i].setId(i);
d[i].setSource("Device" + i);
}the rule only fires once for the combined sets. Below is a sample of
the output.
SetId: 1
SetSource: Device1
(test.clp rule-4) Source= Device1, Id= 1
SetId: 2
SetSource: Device2
(test.clp rule-4) Source= Device2, Id= 2
SetId: 3
SetSource: Device3
Can any one explain the observed behavior.
In case 1, why is the rule firing when I do a set on the Source property? It
seems that the rule is firing when I do a set on any of the ct_device object's
property as long as Id neq -1 !!
If the output from case 1 is a normal behavior, then, why is it that in case 2
when both Id and Source properties are set with no delays between them, I only
get one firing of the rule?
By the way, I am using Jess 60a5 with JDK1.3
Thanks in advance,
Regards,
___________________________
Vicken Kasparian
A C T E R N A
Voice: 941.756.6000 x3550
mailto: [EMAIL PROTECTED]
http://www.acterna.com/
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