[rules-users] how to access process variables within wait state node timers?

[Kris Verlaenen]

Reto,

You should have access to process variables and globals in your timer
action.  There's even a junit test that shows this, testTimerState (last
one on link below):
http://anonsvn.jboss.org/repos/labs/labs/jbossrules/trunk/drools-compiler/src/test/java/org/drools/integrationtests/ProcessStateTest.java

Looking at your code, the timer with event seems to generate a NPE
simply because the timer variable is null so the action
"((DroolsTimer)timer).updateStop();" fails.

By the way, if you define timer of type Object with classname the fully
qualified classname of DroolsTimer, you won't have to cast it.

Kris

Quoting retoy <reto.lamprecht at allianz-suisse.ch>:

> 
> That timer properties can not be changed dynamically is one thing.
> The other
> thing is that in the code that is executed each time a wait state
> timer
> fires, you seem to have no access to any process variables. Would you
> agree
> on this, Kris? If yes, is this planned to change in the future?
> 
> I guess you could at least implement a wait state that continues
> after a
> variable delay if you could access variables in the timer code.
> Namely by
> updating some fact in the working memory i.e. influence the rule
> constraint
> of the wait state. 
> 
> I also tried signalling an event from within the wait state timer and
> update
> the working memory from a subsequent action node where I do have
> access to
> process variables. This although didn't work with me because of a
> strange
> NullPointerException...
> 
> In case anyone is interested: Here is a small project with three
> approaches
> for a wait state node that continues after a variable delay. Neither
> of them
> works, but maybe someone can fix that...
> 
> Reto
> 
>
http://drools-java-rules-engine.46999.n3.nabble.com/file/n989829/demo.variableTimer.zip
> demo.variableTimer.zip 
> 
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