RE: [rules-users] Drools 4.0 StateExampleWithDynamicRules Question

Hello, I was pulled away from my Drools learning and now I am back. I must have missed the response to my previous inquiry. Is there anyone that has experienced the scenario described below? Regards, Daren ________________________________ From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Daren Chylinski Sent: Thursday, August 02, 2007 11:22 AM To: rules-users(a)lists.jboss.org Subject: [rules-users] Drools 4.0 StateExampleWithDynamicRules Question Hello, I am a new Drools user working my way through the examples. To test my understanding of how the rules work, I modified the StateExampleUsingSalience.drl file used in the StateExampleWithDynamicRules example. The result of my change conflicted with my understanding of how the rules should work. I made two modifications in the StateExampleUsingSalience.drl file. The two modifications (shown below) are the commenting out of the two lines in the RHS portion of the "B to D" rule. My understanding of how this would affect the result was: because the "D" State object never changes state to "State.FINISHED" the RHS portion of the "D to E" rule (shown below) would not execute because the first pattern in the LHS would fail to find a State object in working memory that met the criteria of the constraint groups defined within it. My question is: Why does the "D to E" rule in the StateExampleDynamicRules.drl execute the statements in the RHS portion of the rule? lines commented out in the RHS portion. rule "B to D" when State(name == "B", state == State.FINISHED ) d : State(name == "D", state == State.NOTRUN ) then //System.out.println(d.getName() + " finished" ); //d.setState( State.FINISHED ); end the RHS portion to NOT get executed because there aren't any State objects in working memory that have their name == "D" and its state == State.FINISHED because the setState( State.FINISHED ) was never executed on the "D" state object. rule "D to E" when State(name == "D", state == State.FINISHED ) e : State(name == "E", state == State.NOTRUN ) then System.out.println(e.getName() + " finished" ); e.setState( State.FINISHED ); end After my modifications, the output was: A finished B finished C finished E finished I did not expect the "E finished" message to be printed. Regards, Daren Confidentiality Notice: This e-mail message (including any attached or embedded documents) is intended for the exclusive and confidential use of the individual or entity to which this message is addressed, and unless otherwise expressly indicated, is confidential and privileged information of Rackspace Managed Hosting. Any dissemination, distribution or copying of the enclosed material is prohibited. If you receive this transmission in error, please notify us immediately by e-mail at abuse(a)rackspace.com, and delete the original message. Your cooperation is appreciated.