Re: [rules-users] possible bug in latest SNAPSHOT -AccumulateFunction.init() is called when calling modify()
Why is it an issue?
Your rule modifies holder so that the accumulate is no longer needed for that particular
holder, presumably init is called so that the accumulator can restart its state from
scratch and so release the memory it no longer needs. I don't know if it does but
this would then mean the accumulator could be reused later.
I'm not sure how collectList works (or holder.setList) but I'd imagine there
should probably be a clone in there somewhere - having it within holder.setList would
generally be the most appropriate and correct way to ensure the list doesn't get
changed from underneath the holders nose.
Thomas
From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On
Behalf Of Michal Bali
Sent: 12 May 2010 15:09
To: Rules Users List
Subject: Re: [rules-users] possible bug in latest SNAPSHOT -AccumulateFunction.init() is
called when calling modify()
You're probably right.
I have modified the last rule:
----------------------------
rule "GoodBye"
no-loop true
when
$holder : Holder( )
...
-------------------------------
and it now works as expected.
However, this is still an issue...
Best regards,
Michal
On Wed, May 12, 2010 at 2:25 PM, Salaboy
<salaboy@gmail.com<mailto:salaboy@gmail.com>> wrote:
Could be that the modify make the rule condition to be no longer true,
and for that reason the acumulation is zero in that point? I would
like to try it but I'm in my cell phone.
- Ing. Mauricio Salatino -
On May 12, 2010, at 6:58, Michal Bali
<michalbali@gmail.com<mailto:michalbali@gmail.com>> wrote:
Hi,
I may have found a bug with accumulate and 'modify(..)' function
call. It seems that once the modify(..) is called it indirectly
calls AccumulateFunction.init() which invalidates accumulated data.
I have included a simple test case:
I am using the latest snapshot of Drools 5.1.SNAPSHOT
I have created a sample Drools project and just modified the
Sample.drl with this:
-------------------------------------------------------------
import java.util.List;
import java.util.ArrayList;
declare Holder
list : List
end
rule "Hello World"
when
m : Message( )
then
insert(new Holder());
end
rule "GoodBye"
when
$holder : Holder( list == null )
$messages : List() from accumulate(
$message: Message(), collectList($message) )
then
System.out.println($messages); //<-- here the $messages list has
one element
modify($holder) {
setList($messages)
}
System.out.println($messages); //<-- here the $messages list is
empty
end
-----------------------------------------------------
Let me know if you need more information. I can create a JIRA if
needed.
Thank you!
Best regards,
Michal
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