[rules-users] fireUntilHalt and timing of rule activations

[Greg Barton]

Nope, you're not missing anything.  What you need is a control object of some sort thst's inserted after all of the "real" data is inserted. (See attached project for an example.) Rules will look like this, if the control object is called BatchLatch and data objects A:

rule "CountAs"
	dialect "java"
	salience -1
	when
		l : Latch()
		a : A( latch == l )
	then
		retract(a);
		l.incACount();
		System.out.println("Found an A in " + bl);
end      

Note that the A object being processed is tied back to the latch.  This is so multiple latches can be processed simultaneously and their processing won't be intermingled.  This is necessary because there's no guarantee that two Latch objects aren't in working memory at once. (Though you could create a rule that enforces this.)  

GreG

--- On Sat, 10/2/10, Norman C <rent_my_time at yahoo.com> wrote:

> From: Norman C <rent_my_time at yahoo.com>
> Subject: [rules-users] fireUntilHalt and timing of rule activations
> To: rules-users at lists.jboss.org
> Date: Saturday, October 2, 2010, 10:22 AM
> Hi All,
> 
> In my app, I have a separate thread calling fireUntilHalt()
> continuously.  I 
> have quite a few rules, and I am using salience extensively
> to control the order 
> 
> in which rules are executed.  What I have seen (by adding
> an event listener) is 
> that as a new fact is inserted, various rules are
> activated.  Often, the 
> fireUntilHalt will start executing fireNextItem in
> DefaultAgenda before all of 
> the activations are complete.  So if the rule with the
> highest salience 
> value hasn't been activated at this point, then the first
> rule to be fired isn't 
> 
> the correct one.
> 
> This can be worked around by waiting for insert to return
> and then calling 
> fireAllRules().  But it seems like the session should
> block fireUntilHalt from 
> trying to execute activated rules until all activations are
> complete.  Or am I 
> missing something here?
> 
> thanks,
> Norman
> 
> 
>       
> 
> 
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>


      
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