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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Esteban,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I too have been confused by lock-on-active. Only after reading the definition many times, have I come to the following conclusion:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Looking at the documentation, and other examples, I think I can how lock-on-active behaves. From what I gather, it looks like when “init “ rule fires, the
activations for that rule consist of the DataSample() facts (all of them). You then modify the fact, but at the same time, the lock-on-active blocks any further activations from occur as a result of modifying the DataSample() fact.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Since “Rule 1” depends on DataSample, and it is in the same agenda group as init, “Rule 1” cannot fire until the agenda group is changed, or the ruleflow-group
is changed.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">What is being blocked by lock-on-active is not the reactivation of the rule. What is being blocked is the resultant activations as a result of modify the DataSample
fact.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">This block only holds true on the current focus (agenda-group or ruleflow-group). Think of it as a way of temporarily removing the facts from the knowledge
tree.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org]
<b>On Behalf Of </b>Esteban Aliverti<br>
<b>Sent:</b> Wednesday, November 14, 2012 3:41 AM<br>
<b>To:</b> Rules Users List<br>
<b>Subject:</b> [rules-users] lock-on-active clarification needed<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi all,<o:p></o:p></p>
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<p class="MsoNormal">I'm dealing with a set of rules having the lock-on-active attribute and I'm not getting the (at least what I understand as) expected results.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I've created an isolated JUnit test. I'm attaching it to this email.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Basically, I have 2 rules:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">rule "init"<o:p></o:p></p>
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<p class="MsoNormal">lock-on-active true<o:p></o:p></p>
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<p class="MsoNormal">when<o:p></o:p></p>
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<p class="MsoNormal"> $d: DataSample()<o:p></o:p></p>
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<p class="MsoNormal">then<o:p></o:p></p>
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<p class="MsoNormal"> System.out.println("Setting predefined value");<o:p></o:p></p>
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<p class="MsoNormal"> modify($d){<o:p></o:p></p>
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<p class="MsoNormal"> addValue(Parameter.PARAM_A, 10.0)<o:p></o:p></p>
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<p class="MsoNormal"> }<o:p></o:p></p>
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<p class="MsoNormal">end<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">rule "Rule 1"<o:p></o:p></p>
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<p class="MsoNormal">lock-on-active true<o:p></o:p></p>
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<p class="MsoNormal">when<o:p></o:p></p>
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<p class="MsoNormal"> DataSample($v: values[Parameter.PARAM_A] < 20)<o:p></o:p></p>
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<p class="MsoNormal">then<o:p></o:p></p>
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<p class="MsoNormal"> System.out.println("Rule 1: "+$v);<o:p></o:p></p>
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<p class="MsoNormal">end<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">DataSample is a Java class containing a Map<Parameter, Double> where Parameter is an enum.<o:p></o:p></p>
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<p class="MsoNormal">In the test I'm creating a ksession and inserting an empty DataSample object. <o:p></o:p></p>
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<p class="MsoNormal">I understand that as soon as the object is inserted, both rules are evaluated and the result is going to be an activation of rule "init"; and this is what is actually happening. So far so good.<o:p></o:p></p>
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<p class="MsoNormal">Now, after I call fireAllRules() I expect that 'Rule 1' becomes active because of the modification of the fact in "init". Well, this is not the case. I don't see any activation for "Rule 1".<o:p></o:p></p>
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<p class="MsoNormal">My understanding about lock-on-active is that a rule that WAS ACTIVATED is not going to be re-activated until the current agenda group is switched. The odd thing here is that I never had an activation for "Rule 1" so I don't see why it
activation after "init" is executed should be prevented.<o:p></o:p></p>
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<p class="MsoNormal">So my question is: Is my understanding wrong? What is the expected behavior of lock-on-active in this situation? I read the documentation but I couldn't get any hint:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">"<o:p></o:p></p>
<p style="margin-left:.5in;display:inline!important">Whenever a ruleflow-group becomes active or an agenda-group receives the focus, any rule within that group that has lock-on-active set to true<b> will not be activated any more</b>; irrespective of the origin
of the update, the activation of a matching rule is discarded. This is a stronger version of no-loop, because the change could now be caused not only by the rule itself. It's ideal for calculation rules where you have a number of rules that modify a fact and
you don't want any rule re-matching and firing again. Only when the ruleflow-group is no longer active or the agenda-group loses the focus those rules with lock-on-active set to true become eligible again for their activations to be placed onto the agenda."<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:24.0pt"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-left:24.0pt">Best Regards,<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:24.0pt"> <o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:24.0pt"><br>
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX<br>
<br>
Esteban Aliverti<br>
- Blog @ <a href="http://ilesteban.wordpress.com" target="_blank">http://ilesteban.wordpress.com</a><o:p></o:p></p>
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