[rules-users] How to batch high freq events before sending to RHS

[Wolfgang Laun]

On 04/07/2012, Ladd <ladd at codemettle.com> wrote:
> Thanks for the quick reply W!!  I think that was the nudge I needed.  It
> seems like as long as I keep my timer interval shorter than the sliding
> window interval this should work.

I'm sure you realize that this is bound to catch events more than once
unless you mark or retract them.

>  This rule passed my simple tests:
> rule "Grouped Events"
>     timer( int: 500ms )

Shouldn't you use a repeat interval?

> when
>     $list : List() from collect ( MyEvent() over window:time(2s) )
> then
>     for( Object myEvent : $list ) {
>         System.out.println( System.currentTimeMillis() + "ms: event group contains: " + myEvent.toString() );
>     }
> end

> Please let me know if there's a danger with this approach or if there's a
> better way to do it.

It's difficult to propose anything else since I don't know the reason
for dealing with events in batches.

As an alternative to the collect, consider a simple rule that just
adds the MyEvent to the end of a list (a singleton fact), and let the
"Grouped Events" rule with its interval timer (using 2s) look at what
is there.

-W

>
> And thanks again!
>
> - Ladd
>
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