[rules-users] collect return random order

[Manukyan, Sergey]

Yang,

 

I am was suggesting to have regulation to impose particular
order(although it might be a good additional feature as well).  Would
like to just to keep the order as it was in collect list. Especially if
we are returning List that means it is an ordered collection by
definition. It looks like somewhere in the internals of collect there is
a HashSet, sitead of ArrayList used that changes the order of the items
in the incoming list, and that is what I don't agree with... I think it
must be a bug,

 

-Sergey

 

 

 

________________________________

From: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Yang Song
Sent: Monday, August 27, 2007 11:28 AM
To: Rules Users List
Subject: Re: [rules-users] collect return random order

 

I saw someone is requesting LIMIT, here I saw Manukyan is asking for
ORDER BY, and also Mark is talking the FROM. Looks like the rule LHS
part would become more and more like SQL SELECT statement. :)

 

I think it is the right way. Some Stream Database also extends the SQL
to do event aggregation and correlation. The same can be applied to Rule
Engine too.

 

Yang

 

On 8/27/07, Manukyan, Sergey <SManukyan at lear.com> wrote: 

Folks,

 

When using collect on List of items with some filter (criteria), I need
to have result in the same order as it was received: 

 

F.e. I have a list of suppliers : 

 

List()  :   Supplier("FIRST", Status.ACTIVE),  Supplier("SECOND",
Status.INACTIVE), Supplier("THIRD", Status.INACTIVE )

 

And I need to find first INACTIVE supplier, so it must be SECOND
supplier.

 

So doing the following : 

 

 

When 

$l : List()  // list of suppliers

$inactive_supp : ArrayList() from collect Supplier(status ==
Status.INACTIVE) from $l 

Then

            System.out.println($l); // prints FIRST, SECOND, THIRD

System.out.println($inactive_supp);  // prints THIRD, SECOND  ....
Instead of SECOND , THIRD 

 

 

So I am getting THIRD supplier instead of SECOND as the result..

 

Please advise if it is a bug .., or there is another way of doing
that...

 

Thanks,

 

-Sergey

 

 

 

**********************
** LEGAL DISCLAIMER **
**********************

This E-mail message and any attachments may contain 
legally privileged, confidential or proprietary 
information. If you are not the intended recipient(s),
or the employee or agent responsible for delivery of 
this message to the intended recipient(s), you are 
hereby notified that any dissemination, distribution 
or copying of this E-mail message is strictly 
prohibited. If you have received this message in 
error, please immediately notify the sender and 
delete this E-mail message from your computer.


_______________________________________________
rules-users mailing list
rules-users at lists.jboss.org 
https://lists.jboss.org/mailman/listinfo/rules-users

 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.jboss.org/pipermail/rules-users/attachments/20070827/79124072/attachment.html