Basically, no, this is an upcoming feature. There are, as you suggest, some workarounds.
On 2/10/06, Mitch Christensen <[EMAIL PROTECTED]> wrote: > > Of course, I could call WorkingMemory.getObjects() in my consequence and > process the list looking for absence of the object in question. But this > seems inelegant in that I am actually performing what should be a > conditional in my consequence. > > -Mitch > > -----Original Message----- > From: Mitch Christensen [mailto:[EMAIL PROTECTED] > Sent: Friday, February 10, 2006 7:49 AM > To: [email protected] > Subject: [drools-user] Firing rules when something DOESN'T exist > > Hey, > > > > I've used rules engines in the past the support the notion of a NOT > pattern/conditional element for firing rules when a particular item > doesn't > exist in working memory. Does Drools support such a feature? I can't > find > it in the docs. > > > > I want to apply the following logic: > > > > IF there is an event object available > > AND there is no existing event history object > > THEN. > > > > -Mitch > > > > -- Geoffrey Wiseman
