On 12 August 2011 17:46, FrankVhh <[email protected]> wrote:
> > > The difference between stateful and stateless is basically this: > - Stateful: the engine will be able to reevaluate the rules during > execution, hereby enabling foreward chaining. > - Stateless: engine will not do any reevaluations, the state of the facts > as they come in to the engine, will be considered their fixed state, even > if > they are modified. > This is not quite right. An org.drools.runtime.StatelessKnowledgeSession is nothing but a simplifying wrapper for a StatefulKnowledgeSession. The wrapper restricts you to "execute", after which it is "game over": the session is a goner. But, while it is doing its rule firing callisthenics it is behaving just like a StatefulKnowledgeSession. There is, however, a special mode for running a StatelessKnowledgeSesssion: "sequential mode". This, then, results in the restrictions described by Frank, coupled with some performance gains. -W
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