Re: [rules-users] Find out order of insert in RHS
Hello Wolfgang,
thank you for the hint. I introduced a new Class "Counter" with just an int
property and a method "getAndIncrease". This class is referenced in a base rule
which all the other rules extend.
On the RHS of all rule "insert"s I set a field to the value of
c.getAndIncrease() which gives me the correct order. The hint with the static counter was
the right one!
Regards
Dominik
-----Ursprüngliche Nachricht-----
Von: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] Im
Auftrag von Wolfgang Laun
Gesendet: Donnerstag, 7. Februar 2013 18:59
An: Rules Users List
Betreff: Re: [rules-users] Find out order of insert in RHS
If object creation is done in the same order as the insertion: surely a simple static
counter in the class would give you the required monotonous value.
Otherwise, a listener could be set, which will "see" the actual order of
insertion, and it can set the order-of-insertion property.
-W
On 07/02/2013, Sandjaja, Dominik <dominik.sandjaja(a)it-motive.de> wrote:
Hi everybody,
short: is there a way to have an automatic counter for the RHS of a
rule when inserting several objects in one rule?
Long:
I use drools with a DSL to insert items for a frontend dropdown box.
The generated rule is e.g. like the following one:
rule "testRule_H"
dialect "mvel"
when
SomePartOfMyModel( someField == "H" )
then
DropDownItem fact1 = new DropDownItem();
fact1.setLabel( "My Label 1" ); fact1.setValue( "B" );
insert (fact1);
DropDownItem fact1 = new DropDownItem();
fact1.setLabel( "My Label 2" ); fact1.setValue( "A" );
insert (fact1);
This works nicely and I get all the items. The problem I have is with
the sorting. Users use Guvnor to edit the available items for the
dropdown box, so they add and remove items from the RHS. Since I
retrieve those objects from the knowledge base in my java code like this:
Collection<FactHandle> handles =
statefulKnowledgeSession.getFactHandles(new
ClassObjectFilter(DropDownItem.class));
for (FactHandle handle : handles) {
DropDownItem selectItem = (DropDownItem)
statefulKnowledgeSession.getObject(handle);
...
I think I cannot be sure about the order the objects are retrieved
(it's a collection, no guaranteed sorting!). So, I sort the
DropDownItems alphabetically by their value.
My question now is, as stated above: How can I implement a counter
which I can use in the facts being inserted to keep my inserted facts
(DropDownItems) in the same order as they are inserted?
Thanks in advance
Dominik
…………………………………………………………………
mit freundlichen Grüßen / kind regards Dominik Sandjaja
Fon: +49 (0) 203 60878 183
Fax: +49 (0) 203 60878 222
e-mail: dominik.sandjaja(a)it-motive.de
it-motive AG
Zum Walkmüller 10-12
47269 Duisburg
info(a)it-motive.de
http://www.it-motive.de
……………………………………………………………………
Vorsitzender des Aufsichtsrats: Dipl.-Ing. Klaus Straub
Vorstand: Horst-Dieter Deelmann (Vors.), Matthias Heming, Christoph
Tim Klose HRB 9207, Amtsgericht Duisburg
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…………………………………………………………………
mit freundlichen Grüßen / kind regards
Dominik Sandjaja
Fon: +49 (0) 203 60878 183
Fax: +49 (0) 203 60878 222
e-mail: dominik.sandjaja(a)it-motive.de
it-motive AG
Zum Walkmüller 10-12
47269 Duisburg
info(a)it-motive.de
http://www.it-motive.de
……………………………………………………………………
Vorsitzender des Aufsichtsrats: Dipl.-Ing. Klaus Straub
Vorstand: Horst-Dieter Deelmann (Vors.), Matthias Heming, Christoph Tim Klose
HRB 9207, Amtsgericht Duisburg