[rules-users] object creation

[Anstis, Michael (M.)]

You could use a global as OutputObject instead of a Fact. 
 
If you want to use properties of OutputObject in a LHS pattern you'll
need to use "from" but this is not indexed and so using the two rules
with a fact approach might give better performance in this case.

________________________________

	From: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] On Behalf Of thomas kukofka
	Sent: 21 August 2008 15:03
	To: Rules Users List
	Subject: [rules-users] object creation
	
	
	Hello,
	
	I have a rule which creates an object in the consequence part
and updates this object each time teh rule is executed. So the object
has to be created only the first time.
	So I always need two rules, one init rule which creates the
object if it doesn't exist yet and one if it already exists and it
should only be updated:
	
	rule "init rule"
	when
	   "condition"
	   AND 
	   not OutputObject()
	then
	   OutputObject oo = new OutputObject();
	   insert(oo);
	
	rule "update rule"
	when
	   "condition"
	   AND 
	   oo: OutputObject()
	then
	   #do something with the object
	   update(oo);
	
	But is it really neccessary to write an extra rule only to
create the output-fact initially? Is it possible/good style to make this
in one single rule? 
	
	Appreciate your help.
	
	Regards
	Thomas
	

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.jboss.org/pipermail/rules-users/attachments/20080821/722ec4b4/attachment.html