CODEWITHSUNDEEP
javajbossdroolsrule-enginedrools-fusion
Alberto Rugnone
Alberto Rugnone

Reputation: 1

Drools why StatefulKnowledgeSession has different KnowledgeBase

I am try to make some experience with Drools framework. During my test I try the following test

    @Test public void testDrools() {
        KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
        StatefulKnowledgeSession session = kbase.newStatefulKnowledgeSession();
        assertSame(session.getKnowledgeBase(), kbase);
    }

Why this test fails? Is it not true that session has a reference to KnowledgeBase used for its creation? I am a little bit confused about that. Maybe some one can help me to understand it.

Thank you very much in advance. Alberto

Upvotes: 0

Views: 369

Answers (1)

Edson Tirelli
Edson Tirelli

Reputation: 3901

This is an implementation detail and happens mostly because Drools had to maintain backward compatibility with Drools 4.x versions. Both kbase and session.getKnowledgeBase() are wrappers over the real knowledge base, and because of that you have 2 wrappers, but there is only one actual instance of the knowledge base that both wrappers point to.

Upvotes: 1

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