9:59 a.m.
I appreciate the effort.
The problem isn't in the logger. It's just standing in for System.out so that I
can reference a file for output (it's an extension of log4j).
The actual Drools audit view is reporting double activation and execution on insert and
update of the objects.
I'm using a loop to insert my objects into Drools, and I thought at first perhaps I
was inserting them more than once. But I don't see that happening. In any event
wouldn't the audit log tell me if I was doing that?
-A
-----Original Message-----
From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On
Behalf Of Anstis, Michael (M.)
Sent: Thursday, April 17, 2008 2:11 AM
To: Rules Users List
Subject: RE: [rules-users] Why double rule activation?
I have tried to re-produce using "System.out.println" instead of IELogger and I
don't get any double activations :-(
Could the problem be elsewhere (e.g. IELogger?).
package com.sample
import com.sample.MyVariable;
rule "Light is off"
when
$brightness : MyVariable(uniqueName == "ds1@brightness",
currentValue == 0.0)
then
System.out.println("DimmerSwitch1 has no brightness value");
end
rule "Light Below 50%"
when
$brightness : MyVariable(uniqueName == "ds1@brightness",
currentValue < 0.50, currentValue > 0.0)
then
System.out.println("DimmerSwitch1 is below 50% brightness");
end
rule "Light 50% or Above"
when
$brightness : MyVariable(uniqueName == "ds1@brightness",
currentValue >= 0.5)
then
System.out.println("DimmerSwitch1 is at or above 50%
brightness"); End
public static final void main(String[] args) {
WorkingMemoryFileLogger logger = null;
try {
RuleBase ruleBase = readRule();
WorkingMemory workingMemory = ruleBase.newStatefulSession();
logger = new WorkingMemoryFileLogger(workingMemory);
logger.setFileName("events.log");
MyVariable v1 = new MyVariable("ds1@brightness", 0.0d);
MyVariable v2 = new MyVariable("ds1@brightness", 0.4d);
MyVariable v3 = new MyVariable("ds1@brightness", 0.6d);
workingMemory.insert(v1);
workingMemory.insert(v2);
workingMemory.insert(v3);
workingMemory.fireAllRules();
} catch (Throwable t) {
t.printStackTrace();
} finally {
if (logger != null) {
logger.writeToDisk();
}
}
}
-----Original Message-----
From: rules-users-bounces(a)lists.jboss.org
[mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Bagwell, Allen F
Sent: 16 April 2008 20:50
To: Rules Users List
Subject: [rules-users] Why double rule activation?
I've encountered rule engine behavior I'm knocking my head against the wall trying
to figure out. I'm a Drools newbie, so please forgive if this I am doing something
bone-headed wrong.
Basically I'm inserting an object into my working memory. The object itself has a
default setting of 0.0 for a brightness value, and this setting matches the LHS condition
for my first rule. The problem is the rule activates twice for a single object insertion
as described in the audit log.
It consequently executes twice when I fire all rules. Then whenever I change the value in
question, any single update to the same object also causes double rule activation and
execution.
The rules I've written are not complex. Here's my drl file:
package dimmerie;
#list any import classes here.
import knowledgebase.*;
import NipcLogger;
#declare any global variables here
global NipcLogger IELogger;
rule "Light is off"
when
$brightness : MyVariable(uniqueName == "ds1@brightness",
currentValue == 0.0)
then
IELogger.info("DimmerSwitch1 has no brightness value"); end
rule "Light Below 50%"
when
$brightness : MyVariable(uniqueName == "ds1@brightness",
currentValue < 0.50, currentValue > 0.0)
then
IELogger.info("DimmerSwitch1 is below 50% brightness"); end
rule "Light 50% or Above"
when
$brightness : MyVariable(uniqueName == "ds1@brightness",
currentValue >= 0.5)
then
IELogger.info("DimmerSwitch1 is at or above 50% brightness");
end
I'm hoping I've described enough without having to post additional code.
Can anyone suggest why this is happening?
Thanks,
Allen
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