Re: [rules-users] Possible problem in PathMemory

Hi Mario, I figured out this is a problem with Event and dynamic salience. Suppose we have the following declarations and rules: declare Message @role(event) end rule "rule1" salience RuleSalience.RULE1 when $m : Message() then System.out.println("====================> rule1"); retract($m); RuleSalience.RULE1 = RuleSalience.RULE2 - 1; end rule "rule2" salience RuleSalience.RULE2 when $m : Message() then System.out.println("=====================> rule2"); retract($m); RuleSalience.RULE2 = RuleSalience.RULE1 - 1; end I want when a Message is inserted, either rule1 or rule2 is fired. I also want two rules can fire alternatively. So when one rule is fired, its salience becomes lower. The result is, if I don't declare Message as an Event, it works fine. Otherwise, only rule1 is fired. The problem seems to be at org.drools.core.reteoo.LeftInputAdapterNode::doInsertSegmentMemory(). Because of stream mode, both rules are not inserted StagedLeftTuples. So rule1 and rule2 are not compared based on salience. Because rule1 has a smaller act#, it is always fired first. The attached zip is a test case. If you want mvn clean test, it will fail. However, if you remove the following lines from Sample.drl, the test will succeed. "declare Message @role(event) end" Thanks. Jinghai