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<p class="MsoNormal"><span style="color:#1F497D">Why is rule 1 written the way it is? Why can’t you just do:<o:p></o:p></span></p>
<p class="MsoNormal"><span class="text-cell"><span lang="EN-US">rule "Rule 1 - Remove all A's that have property set to 123"
</span></span><span lang="EN-US"><br>
<span class="text-cell"> salience 1000 </span><br>
<span class="text-cell">when </span><br>
<span class="text-cell"> $anA : A( property == "123" )</span><br>
<span class="text-cell">then </span><br>
<span class="text-cell"> retract ($anA) </span><br>
<span class="text-cell">end</span></span><span style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Thomas<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:
"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" 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>Justin Beltran<br>
<b>Sent:</b> 21 July 2010 16:28<br>
<b>To:</b> rules-users@lists.jboss.org<br>
<b>Subject:</b> [rules-users] Rules not firing when expected after retracting object in list<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span class="text-cell"><span lang="EN-US">Hi, </span></span><span lang="EN-US"><br>
<br>
<span class="text-cell">I'm coming across some weird behavior in Drools 4.0.7, but maybe it's just cause I don't understand I how Drools works. Assume, there's a class "A" that has a property called "property".
</span><br>
<br>
<span class="text-cell">As facts, I have the following list of A's: </span><br>
<span class="text-cell">A1, property = 123 </span><br>
<span class="text-cell">A2, property = 345 </span><br>
<span class="text-cell">A3, property = 123 </span><br>
<br>
<span class="text-cell">I have two rules as follows: </span><br>
<br>
<span class="text-cell">rule "Rule 1 - Remove all A's that have property set to 123"
</span><br>
<span class="text-cell"> salience 1000 </span><br>
<span class="text-cell"> lock-on-active true </span><br>
<span class="text-cell">when </span><br>
<span class="text-cell"> $listOfAs : ArrayList collect(A( property == "123" )) </span>
<br>
<span class="text-cell">then </span><br>
<span class="text-cell"> for (Object a: $listOfAs ) { </span><br>
<span class="text-cell"> retract (a) </span><br>
<span class="text-cell"> } </span><br>
<span class="text-cell">end </span><br>
<br>
<span class="text-cell">rule "Rule 2 - Do stuff with remaining A's" </span><br>
<span class="text-cell"> salience 900 </span><br>
<span class="text-cell"> lock-on-active true </span><br>
<span class="text-cell">when </span><br>
<span class="text-cell"> $listOfAs : ArrayList collect(A()) </span><br>
<span class="text-cell">then </span><br>
<span class="text-cell">... </span><br>
<span class="text-cell">end </span><br>
<br>
<span class="text-cell">My understanding is "Rule 1" will remove the facts of class A that have property to 123. When it gets to "Rule 2", shouldn't the "listOfAs" only have that one A that remains (i.e. the one where property is set to "345"). What I'm
noticing is that "Rule 2" just doesn't execute at all even though I'm assuming there is still one "A" object that hasn't been retracted. If I comment out the "retract" it executes "Rule 2" fine.
</span><br>
<br>
<span class="text-cell">Am I missing something about these rules work? </span><br>
<br>
<span class="text-cell">Thanks. </span><br>
<span class="text-cell">Justin</span><o:p></o:p></span></p>
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