[rules-users] Initial rule delay

[Vincent LEGENDRE]

In 5.4 timers support expressions for values.
You can thus use a fact used to hold timer values (init and delay). This fact is created with some non-zero values, and reset all to zero once a first rule has triggered

rule "delayAtFirstTime" timer(expr: $timerSpec.getDelay()+"s" , "0s")
when
   $timerSpec : TimerSpec()
   ....

then
   ....
   $timerSpec.setDelay(0);
   update($timerSpec);
end


Another solution is to create a fact that enable rule triggering that you insert "later" (may be that's the problematic aspect ...), something like that

rule "DoSomethingWhenYouCan"
when
    exists( OkToGo() )
    ....
then
    ...
end

Note that the OkToGo() fact can be inserted by a rule too ...
rule "OkToGoAfter10s" timer(10s 0)
when
   not( OkToGo() )
then
   insert( new OkToGo() ); 
end


----- Original Message -----
From: "Paul R." <reverselogic at gmail.com>
To: "Rules Users List" <rules-users at lists.jboss.org>
Sent: Mercredi 6 Juin 2012 16:47:03
Subject: [rules-users] Initial rule delay



Hi, 

I'm looking for a way to delay a rules initial execution? In the following example, I would like to prevent the rule from firing when the first "Foo" event is inserted into the working memory. 


rule "DelayTest" when $n : Number() from accumulate( $f : Foo() over window:time(10s) count($f) ) then // bla end 


The timer attribute seems to almost support what I'm looking for, i.e. it allows for an initial-delay to be specified; but if the repeat interval is omitted, it uses the initial delay as the repeat interval. 


timer ( int: <initial delay> <repeat interval>? ) 


In my case I would like to block the execution of the rule for an "initial-delay" period, but after that time has elapsed the rule should fire when every time a new "Foo" event is inserted into the working memory. What is the recommended way to do this? 


Thanks & Regards, 


Paul 












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