If there is no cogent reason for collecting a List and acting on it you should match a
single Alarm and update it on the rule's right hand side:

rule "Rule [Alarm Collection]"
when
$alarm: Alarm ( justInserted == true )
then
modify( $alarm ){ setJustInserted( false ) }
end

Note that you still can store a reference to this Alarm in some global or call Java

code for additional processing.

If you do need a collected List, you'll have to copy it on the rule's right hand side

before you call your Java code.

ArrayList copy = new ArrayList( $alarmColl );

The update() call is causing instant reorganisation and the collect result is some
sort of cache.

On 12 April 2014 05:56, mohanm <mohanm.eee@gmail.com> wrote:

Hi,

I am using Drools 5.5.0 Final Expert to do Alarm Co-relation. I was trying
to collect the facts in to the ArrayList collection. My drl file will look
like below. From the Rule I calling an Java method to access the collected
facts.

/rule "Rule [Alarm Collection]"
no-loop
when
$alarmColl : ArrayList() from collect(Alarm
(
JustInserted == true;
))

then
// act on $alarmColl
end/

while in my Java code I am loop through the collection to set an attribute
of the Alarm Object. But while I am trying to set this attribute in the
collection, the collection is getting updated and indexes are changed. Due
to which all the objects are not updated. Even I tried using the iterator to
access the ArrayList collection. Still the same issue.

/
while(index < alarmColl.size()){
Alarm alarmObj=alarmColl.get(index)

if(alarmObj.isJustInserted()) {
alarmObj.setJustInserted(false);
theScenario.getSession().update(alarmObj);
}
index++;
}/

How can I update the objects in collection without changing the index or any
other way to achieve this.

--
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