One rules is fired per cycle, so it depends the rules that it's fired first.<br>You are right it's totally up to the conflict resolution strategy.<br><br><br><div class="gmail_quote">On Fri, Aug 6, 2010 at 12:04 PM, Anstis, Michael (M.) <span dir="ltr"><<a href="mailto:manstis1@ford.com">manstis1@ford.com</a>></span> wrote:<br>
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<p><font face="Arial" size="2">HI,</font>
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<p><font face="Arial" size="2">There was an interesting discussion today on IRC; a user "jochen" reported NPEs when trying to iterate lists in the RHS constructed in the LHS using "from collect".</font></p>
<p><font face="Arial" size="2">I was wondering how Drools handles lists constructed in the LHS; if the list contained 5 elements but another rule retracted one of those elements would the list available in the RHS contain 4 or 5 elements?</font></p>
<p><font face="Arial" size="2">Here's a simplification of what was posted at </font><a href="http://pastebin.com/yKGSxFkA" target="_blank"><u><font color="#0000ff" face="Arial" size="2">http://pastebin.com/yKGSxFkA</font></u></a>
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<p><font face="Arial" size="2">Rule 1</font>
<br><font face="Arial" size="2">when</font>
<br> <font face="Arial" size="2">$cheese : ArrayList() from collect(CheeseFact());</font>
<br><font face="Arial" size="2">then</font>
<br> <font face="Arial" size="2">for(int i=0; i<$cheese.size(); i++) {</font>
<br> <font face="Arial" size="2">//Something useful…</font>
<br> <font face="Arial" size="2">}</font>
<br><font face="Arial" size="2">end</font>
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<p><font face="Arial" size="2">What if there was another rule that did something like this:-</font>
</p>
<p><font face="Arial" size="2">Rule 2</font>
<br><font face="Arial" size="2">When </font>
<br> <font face="Arial" size="2">$cf : CheeseFact(type == "chedder")</font>
<br><font face="Arial" size="2">Then</font>
<br> <font face="Arial" size="2">retract($cf);</font>
<br><font face="Arial" size="2">end</font>
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<p><font face="Arial" size="2">What would be the list Rule 1 iterates?</font>
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<p><font face="Arial" size="2">I'd assume since I believe activation execution to be serial it would depend on the agenda's conflict resolution strategy or rule salience?</font></p>
<p><font face="Arial" size="2">What would be the learned opinion?</font>
</p>
<p><font color="#000000" face="Arial" size="2">With kind regards,</font>
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<p><font color="#000000" face="Arial" size="2">Mike</font>
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