[rules-users] CEP sliding window in the past

[cfuser]

Can you offset the sliding window functionality to look for a window in the
past?  What I'm trying to do is offset the window from 'now'.  E.g. 
Assuming it is 12:05 and I have been receiving objects for 5 minutes, I'm
trying to get this to sum received objects between 2 and 3 minutes ago.  

rule "Accumulate attempts over 1 minute (window over time)"
    when
        $measure : Number()
            from accumulate( MyData( $m:measures["attempts"],
objectType=="climber" )
                over window:time( 2m, 3m ) from entry-point "My Stream",
                sum($m))
                
    then
    #
end 

Looking at the SlidingTimeWindow source code, it looks as though you can't
offset the window by a delay?  Is that accurate?  If you can't do that
directly via a sliding window, is there a way to work around this?

TIA.


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