[rules-users] Storing temp results in eval block

[cfili]

Thanks, I had not thought of it this way.  The one thing that worries me
about making the Resource object modifiable and not "read-only" is that
multiple rules may be using that object.  I would not want one rule to
override a value in the attributes map.  To avoid this I would have to make
the keys in the attributes map unique for the rule.

Again thanks for the feedback.


Edson Tirelli-3 wrote:
> 
>     What I would do in your case is to have 2+ rules. One rule calculates
> the value, and the other(s) rule(s) will reason over the calculated value.
>     Example:
> 
> rule "Calculates Memory Usage"
> when
>      $mpw: Resource( type=="MemoryInfo", attributes.Percent == null,
> $phys:
> attributes.PhysicalUsed, $tot: attributes.TotalPhysical )
> then
>      $mpw.setAttribute( "Percent", ((Double)$phys).doubleValue() /
> ((Double)$tot).doubleValue());
>      update( $mpw );
> end
> 
> rule "High Average Usage"
> when
>     Resource( type=="MemoryInfo", attributes.Percent > .95 )
> then
>     // do something
> end
> 
> rule "Medium Average Usage"
> when
>     Resource( type=="MemoryInfo", attributes.Percent > .50 && <= .95 )
> then
>     // do something
> end
> 
>     Hope it helps...
> 
>      []s
>      Edson
> 
> 
> 
> 2007/8/27, cfili <cfilippelli at cerner.com>:
>>
>>
>> Sure... basically using a map called "attributes" to retrieve specific
>> attributes on a resource.  Currently I am simply printing the value from
>> the
>> eval, but I would like to be able to store it.
>>
>> rule "High Memory 95%"
>>
>>         when
>>                 $mpw : Resource(type == "MemoryInfo", $physUsed :
>> attributes["PhysicalUsed"], $totalPhys : attributes["TotalPhysical"])
>>                 eval((((Double)$physUsed).doubleValue() /
>> ((Double)$totalPhys).doubleValue()) > 0.95)
>>         then
>>                 System.out.println(" Percent Used: " +
>> ((Double)$physUsed).doubleValue() /
>> ((Double)$totalPhys).doubleValue());
>> end
>> --
>> View this message in context:
>> http://www.nabble.com/Storing-temp-results-in-eval-block-tf4225783.html#a12354084
>> Sent from the drools - user mailing list archive at Nabble.com.
>>
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>>
> 
> 
> 
> -- 
>   Edson Tirelli
>   Software Engineer - JBoss Rules Core Developer
>   Office: +55 11 3529-6000
>   Mobile: +55 11 9287-5646
>   JBoss, a division of Red Hat @ www.jboss.com
> 
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> 
> 

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