[rules-users] Drools 5 PseudoClock with StatelessKnowledgeSession

[Mark Proctor]

Look at the interval timer test here from line 254 onwards, and the 
subsequent cron tests:
https://github.com/droolsjbpm/drools/blob/master/drools-compiler/src/test/java/org/drools/integrationtests/TimerAndCalendarTest.java#L254


On 13/10/2009 00:32, Ben Scott wrote:
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> I'm wanting to use the date-effective and date-expiry rule metadata to 
> add date specific rule variants within my app. To test these I was 
> planning on using the pseudo clock and setting the expected date prior 
> to executing the rules within a StatelessKnowledgeSession. I can set 
> the clock easily enough, but can't understand why the 
> getSessionClock() method is missing? It's on the 
> StatefulKnowledgeSession, but not on the Stateless.
> I'm initialising the session like this:
> SessionConfiguration sessionConfiguration = new SessionConfiguration();
> sessionConfiguration.setClockType( ClockType.PSEUDO_CLOCK );
> StatelessKnowledgeSession session = 
> _testKnowledgeBase.newStatelessKnowledgeSession(sessionConfiguration);
> The only thing I could think of to set the pseudo clock was to write a 
> command something like:
> private static class SetPseudoClockCommand implements 
> org.drools.process.command.Command<Boolean> {
> public Boolean execute(ReteooWorkingMemory session) {
> // Set the clock to the current date
> pseudoSessionClock.advanceTime(new DateTime().getMillis(), 
> TimeUnit.MILLISECONDS);
> // Add a couple of days
> pseudoSessionClock.advanceTime(2, TimeUnit.DAYS);
> return true;
> }
> }
> But this doesn't appear to take any effect whilst rules are running.
> Is there another way to get programmatic access to the session clock, 
> or some better way of changing the underlying date prior to rule 
> execution?
> Ben.
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