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<p class=MsoNormal>Hi All,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I am in the process of evaluating Drools to use in a networks
& systems management project. Some of the initial use cases are listed
below.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><b>Use Cases:<o:p></o:p></b></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>Simple single parameter thresholds with configurable
warning and error levels.<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>Simple multi parameter thresholds from one host with
configurable warning and error levels.<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='mso-list:Ignore'>3.<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>Complex multi parameter thresholds from multiple hosts
with configurable warning and error levels.<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='mso-list:Ignore'>4.<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>Complex time based multi parameter thresholds from
multiple hosts with configurable warning and error levels.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>After reading about the Drools rules engine (Expert) and the
CEP (Fusion) it seems at a glance that it would be very useful in this
application. As I digging into use case 1 I am not sure Drools is actually going
to fit the bill as first thought.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Imagine a small network with 300 hosts each of which is
being polled for CPU data which can be massaged to produce an instantaneous CPU
Utilization which I want to check against some threshold, which can be
different for each host. I don’t see creating 300 rules to handle this
simple case as an ideal solution as I need to give control of the CPU
Utilization threshold to the teams who own the hosts. Thinking about how to
abstract that I imagine I could put the thresholds into a database and
rebuild/reload the rules as necessary but as the thresholds could change often
this seems like unnecessary overhead. I have moved on from that solution to the
idea that a threshold is an attribute of the parameter as name and value are
attributes. This allows me to attach the threshold value to the parameter
update and potentially have a Drools rule something like (not a working rule):<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><i>rule “test rule”<o:p></o:p></i></p>
<p class=MsoNormal><i> when<o:p></o:p></i></p>
<p class=MsoNormal><i> $param
: Parameter(name == someName) # comes from some map of params or something, not
sure yet.<o:p></o:p></i></p>
<p class=MsoNormal><i> $param(value
>= warningThreshold)<o:p></o:p></i></p>
<p class=MsoNormal><i> then<o:p></o:p></i></p>
<p class=MsoNormal><i> #
Fire warning alert<o:p></o:p></i></p>
<p class=MsoNormal><i> end<o:p></o:p></i></p>
<p class=MsoNormal><b><o:p> </o:p></b></p>
<p class=MsoNormal>Where value and warningThreshold are members of the
Parameter object. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Having thought about this and discussed with some colleagues
we can not impose a ‘>=’ in the rule as some teams might what a
different set of comparators. Moving on to these new requirements I thought we
could have all the info encapsulated into the Parameter object as a set of
functions:<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l1 level1 lfo2'><![if !supportLists]><span
style='font-family:Symbol'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]>isInWarning<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l1 level1 lfo2'><![if !supportLists]><span
style='font-family:Symbol'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]>isInError<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><i>rule “test rule”<o:p></o:p></i></p>
<p class=MsoNormal><i> when<o:p></o:p></i></p>
<p class=MsoNormal><i> $param
: Parameter(name == someName) # comes from some map of params or something, not
sure yet.<o:p></o:p></i></p>
<p class=MsoNormal><i> $param.isInWarning()<o:p></o:p></i></p>
<p class=MsoNormal><i> then<o:p></o:p></i></p>
<p class=MsoNormal><i> #
Fire warning event<o:p></o:p></i></p>
<p class=MsoNormal><i> End<o:p></o:p></i></p>
<p class=MsoNormal><i><o:p> </o:p></i></p>
<p class=MsoNormal>Questions:<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l2 level1 lfo3'><![if !supportLists]><span
style='font-family:Symbol'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]>Is the above possible in Drools?<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l2 level1 lfo3'><![if !supportLists]><span
style='font-family:Symbol'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]>What does Drools get me as my software is
already doing all the calculation and comparison work? <o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l2 level1 lfo3'><![if !supportLists]><span
style='font-family:Symbol'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]>Is there a better way to handle this using
Drools?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thanks for the reply’s<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal> Glenn<o:p></o:p></p>
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