[rules-users] possible bug in latest SNAPSHOT - AccumulateFunction.init() is called when calling modify()

[Salaboy]

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 at 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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