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<p class=MsoNormal>Hi,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span lang=EN-US>I’m trying to figure out an issue for
three days now and I’m getting kind of desperate, so I hope someone can
help.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>I’m using Drools in combination with
an EMF model which is modeling a computer network. On init, I read the whole
structure of the model and insert all elements into the working memory. Some of
the entities share the super class “Device” which has an attribute “state”.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Now I’m having the following rule to
change an attribute of one of the model entities:<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><b><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:#960000'>rule</span></b><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'> </span><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:green'>"Set
received status to model"</span><span lang=EN-US style='font-size:10.0pt;
font-family:"Courier New";color:black'> </span><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'> </span><b><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:#960000'>when</span></b><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'> $event
: SomeEvent ( </span><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'> $hostname
: hostname,</span><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'> $hoststate
: hoststate,</span><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'> $timestamp
: timestamp</span><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'> )</span><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'> </span><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'> $device
: Device (</span><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'> name
== $hostname</span><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'> )</span><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'> </span><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'> </span><b><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:#960000'>then</span></b><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'> </span><b><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:#960000'>modify</span></b><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'>($device)
{</span><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'> setState($hoststate);</span><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'> }</span><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'> db.commit(</span><b><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:#960000'>false</span></b><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'>);</span><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'> </span><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'> </span><b><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:#960000'>retract</span></b><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'>($event); </span><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'> System.err.println(</span><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:green'>"Set
status of "</span><span lang=EN-US style='font-size:10.0pt;font-family:
"Courier New";color:black'> + $device + </span><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:green'>" to "</span><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'> +
$hoststate);</span><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></p>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Courier New";
color:#960000'>end</span></b><span lang=EN-US><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>… which works perfectly fine. Anyway,
what I want to do in this test case is to <b>react whenever all child devices
of a mutual parent device</b> (e.g. hosts on one switch) are no longer reachable.
I thought of a rule like the following:<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><b><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:#960000'>rule</span></b><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'> </span><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:green'>"Parent
Children Test"</span><span lang=EN-US style='font-size:10.0pt;font-family:
"Courier New"'><o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'> </span><b><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:#960000'>when</span></b><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'> </span><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'> $parent
: Device (</span><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'> $children
: eContents,</span><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'> eContents.size
> 0</span><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'> )</span><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'> </span><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'> </span><b><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:#960000'>forall</span></b><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'> (</span><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'> $child
: Device (</span><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'> </span><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'>state ==
"DOWN"<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'> )
</span><b><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";
color:#960000'>from</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Courier New";color:black'> $children</span><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'> )</span><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'> </span><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'> </span><b><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:#960000'>then</span></b><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'> </span><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'> </span><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:olive'>…</span><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></p>
<p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:
"Courier New";color:#960000'>end<o:p></o:p></span></b></p>
<p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:
"Courier New";color:#960000'><o:p> </o:p></span></b></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-US>… which by the way worked perfectly fine as long as I was not
using objects from a model. My first idea was that for some strange reason the
object might get copied so that I actually would have two different references
after modifying it, but this is not the case. When I initialize the rule base
with the circumstances that the second rule would fire, it really does. It just
seems as it would not being evaluated after changing the attribute, but this is
not the case either! So all I can think of is some strange caching, maybe in
combination with the </span><b><span lang=EN-US style='font-size:10.0pt;
font-family:"Courier New";color:#960000'>forall </span></b><span lang=EN-US>statement?
Maybe someone has some experience when using Drools with EMF + CDO and
experienced as similar issue? <o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-US>Any help would be very very very much appreciated! <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Thanks
in advance<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Georg</span><o:p></o:p></p>
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