   Ok, your case seems clearly a case where you need either a StatefulSession or your application needs to send previous readings to drools.
   If you are using a StatefulSession AND you always use the same SystemInfo object (just use update on it), you could use "duration" on your rule:

rule "Start_New_Process_If_System_is_70%_Idle_Continuously_for_60_Seconds"
   duration 60000
when
    SystemInfo (idle >= 70) //Idle continuously for 60 seconds

then
// start new process
end

   Using StatelessSession, you must have an update rule for your object

rule "System_is_70%_Idle"
    salience 10
when
    $si : SystemInfo (idle >= 70)
then
    $si.setIdleCounter( $si.getIdleCounter() + 1 );
end

rule "Start_New_Process_If_System_is_70%_Idle_Continuously_for_60_Seconds"
when
    SystemInfo( idleCounter >= 12)
then
// start new process
end

   []s
   Edson

2008/8/19 ganesh.p <ganesh_patkar@hotmail.com>

I need to create a rule with following requirements:

There is a fact class called SystemInfo which contains idle information of a
sytem

public class SystemInfo {
private double idle; //System idle percentage

public void setIdle(double idle) {
this.idle = idle;
}

public double getIdle() {
return this.idle;
}
}

The SystemInfo objects are continuously sent to DROOLS (StatelessSession)
with 5 second delay.

I need to create a rule

rule "Start_New_Process_If_System_is_70%_Idle_Continuously_for_60_Seconds"

when SystemInfo (idle >= 70) //Idle continuously for 60 seconds
then
// start new process

end

I need to fire this rule only if all the 12 SystemInfo objects which are
sent with 5 seconds delay for 60 seconds, match the condition "idle >= 70".
Even if a single SystemInfo doesn't match this condition then this rule
shouldn't be fired.

I am using DROOLS 4.0. Please help me in implementing the WHEN condition.

Thanks
-Ganesh
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--
Edson Tirelli
JBoss Drools Core Development
JBoss, a division of Red Hat @ www.jboss.com