Re: [rules-users] Sliding windows and event retraction
Any help with the query below would be much appreciated. I am assuming that
event retraction is not automatic using the pattern below, however I am
trying to come by an approach to ensuring only one event exists on an entry
point at any moment in time. One thought was that when a rule inserts a new
event, it first retracts the previous event, although I think that a rule
cannot have state and can therefore not maintain a handle to the previously
inserted event? What would be a good approach to achieving this?
Many thanks,
James
jwillans2 wrote:
Hello,
I am using sliding windows in the form:
Obj(..) over window:length(1) from entry-point EP1
Where many events are being inserted into EP1. Reading the documentation
I expected Drools to infer from the window length that all events on EP1
apart from the latest one can be retracted, is this correct? The reason I
ask is that I am not seeing retraction of events from EP1 when I debug the
session, and I am see behaviour which suggests the rule is firing against
old events on the entry point.
Basically I want to get to simulate that an entry point can only contain
one event at any point in time and that this event is the latest one to
arrive.
Thanks,
James
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