[rules-users] Monitoring sensor parameter change

[Greg Barton]

rule "first Reading"
when
   $r: Reading()
   not LastReading( this == $r )
then
   insert( new LastReading( $r ) );
end



________________________________
 From: Wolfgang Laun <wolfgang.laun at gmail.com>
To: Rules Users List <rules-users at lists.jboss.org> 
Sent: Tuesday, June 11, 2013 12:07 PM
Subject: Re: [rules-users] Monitoring sensor parameter change
 


Basically a good approach.


declare LastReading

  last : Reading
end


// fire once, to set up LastReading with the very first Reading
rule "first Reading"
when
   $r: Reading()
   not LastReading()
then
   insert( new LastReading( $r ) );
end


// based on the existence of a previous reading...

rule "next Reading"
when
  $lr: LastReading( $last: last )
  Reading( this == $last, $pp: power )

then
end


// ...detect and handle an increment beyond the threshold
rule "next Reading, big increment"
extends "next Reading"
when
  $new: Reading( $np: power > $pp + 2 )
then

  update( $lr ){ setLast( $new ) }

  ... code for big increment

end


// ...detect and handle an increment below the threshold
rule "next Reading, small increment"
extends "next Reading"
when
   $new: Reading( this != $last, $np: power <= $pp + 2 )
then

  update( $lr ){ setLast( $new ) }
end


All of this is untested and may contain syntax errors. - The additional constraint (this != $last) in the last rule avoids looping. 

-W







On 11 June 2013 14:46, rjr201 <rich.j.riley at gmail.com> wrote:

If I understand your question right, you could create a class called
>LastReading( SensorRead() ) and then your rules would look something like:
>
>rule 1 //check to see if the increase is > 2
>when
>   $last : LastReading( SensorRead($lastPower : power) )
>   SensorRead( $lastPower - power > 2)
>then
>   System.out.println("Power increased more than 2")
>end
>
>rule2 //update which sensor read is the lastest reading
>salience 100
>when
>   $last : LastReading( )
>   $new : SensorRead()
>then
>   retract($last)
>   insert(new LastReading($new))
>end
>
>
>
>--
>View this message in context: http://drools.46999.n3.nabble.com/rules-users-Monitoring-sensor-parameter-change-tp4024242p4024243.html
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>
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