<html><body><div style="font-family: times new roman, new york, times, serif; font-size: 12pt; color: #000000"><div>Forgot to say : using drools 5.6.FINAL<br></div><div><br></div><hr id="zwchr"><div style="color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;"><b>De: </b>"Vincent LEGENDRE" <vincent.legendre@eurodecision.com><br><b>À: </b>"Rules Users List" <rules-users@lists.jboss.org><br><b>Envoyé: </b>Jeudi 28 Août 2014 15:28:49<br><b>Objet: </b>[rules-users] Inconsistent behaviour of insertLogical in rules having from pattern<br><div><br></div><div style="font-family: times new roman, new york, times, serif; font-size: 12pt; color: #000000"><div>Hi all,<br></div><div><br></div><div>It is 2 days I am fighting with a strange behaviour of insertLogical in rules having from pattern in conditions : it works the first time, and not after ...<br></div><div><br></div><div>-----------------------------------------<br></div><div>Here is my use-case (simplified) :<br></div><div><br></div><div>I have a class that represent a Flight. A Flight has a start/end datetime and is associated with a Airplane and a list of Crew :<br></div><div>class Flight {<br></div><div> String airplaneId;<br></div><div> List<String> crewIds;</div><div> Date start;<br></div><div> Date end;<br></div><div>}<br></div><div><br></div><div>I want to maintain an alert list that contains all overlaps for each airplane and each crew. So I have rules like:<br></div><div><br></div><div>rule "Overlap Airplane"<br></div><div> when<br></div><div> $f1 : Flight($airplaneId : airplaneId)<br></div><div><div> $f2 : Flight(this != $1, airplaneId == $airplaneId, ... and periods intersecting ... )</div> then<br></div><div> insertLogical(new Alert(...));<br></div><div>end<br></div><div><br></div><div><div>rule "Overlap Crews"</div><div> when</div><div> $f1 : Flight()</div><div> $crew : String from $f1.getCrewIds()<br></div><div><div> $f2 : Flight(this != $1, eval($f2.getCrewIds().contains($crew)) , ... and periods intersecting ... )</div> then</div><div> insertLogical(new Alert(...));</div><div>end</div><div><br></div><div><br></div><div><div>-----------------------------------------</div></div><div>Ok. So what I do to test all that stuff :<br></div><div> - create a new session<br></div><div> - add a first single Flight --> no alerts at all, normal<br></div><div> - add a second Flight insersecting the first one with same airplane and same crews list --> 3 new alerts inserted (one for airplane, one for each crew) : normal<br></div><div><div> - remove this second Flight --> the 3 preivous alerts are retracted : still ok<br></div><div> - re-add this second Flight --> only the 'airplane' rule triggers, I only get one new alert insteads of the previous same 3 .... The alerts not inserted correspond to the rule having 'from' in it<br></div><div><br></div><div><br></div><div><div>-----------------------------------------</div>To test that it is the source of the problem, I add a new explicit association object that I insert in WM :<br></div><div>class CrewAffectation {<br></div><div> String idCrew;<br></div><div> String idFlight;<br></div><div>}<br></div><div><br></div><div>For each inserted Flight, I also insert corresponding new CrewAffectation objects. (in case of retract, I retract them of course).<br></div><div>I change the last rule to something like :<br></div><div><div><br></div><div>rule "Overlap Crews"</div><div> when</div><div> $f1 : Flight($id1 : id</div><div><div> $f2 : Flight(this != $1, $id2 : id, ... and periods intersecting ... )</div> $crewAff1 : CrewAffectation($idCrew : idCrew, idFlight== $id1)<br> $crewAff2 : CrewAffectation(idCrew == $idCrew, idFlight== $id2) <br></div><div> then<br></div><div> insertLogical(new Alert(...));</div><div>end</div></div><div>And with this 'no-from' approach, everything is working as expected.<br></div><div><br></div><div><div><div>-----------------------------------------</div>In addition, I suspect the truth maintenance system to have leaks, and notably in the source kBase.</div>Why ? Because I was facing problems by reusing the same kBase to generate multiples kSessions : The first session created reacted well, while all the folowing not. </div><div>And it was in fact the same problem as the one described here : usage of from and insertLogical in the same rule. </div><div>The first created session adds and retract my 3 alerts, the second created session only adds the airplane alert. </div><div><br></div><div>With using the explicit association object, I can reuse my kBase and everything is working well.</div><div><br></div><div><div>-----------------------------------------</div></div><div>Does someone already faced the problem ?<br></div><div>Does it looks like a real bug to dev team or am I doing something wrong (but as it work once, I guess it is a bug) ?<br></div><div><br></div><div><br></div>Vincent<br></div><div><br></div></div></div><br>_______________________________________________<br>rules-users mailing list<br>rules-users@lists.jboss.org<br>https://lists.jboss.org/mailman/listinfo/rules-users</div><div><br></div></div></body></html>