[rules-users] Fusion and open-ended intervals?

[Barry Kaplan]

Actually Greg I did something very similar. Since drools locks down the event
temporal values, I added to my event class some helper methods indicating
whether the interval is open or closed:

abstract class Event {
  def interval: Interval  // joda interval
  def isOpen = interval.end.getMillis == infiniteMillis
  def isClosed = !isOpen
}

And then in rules, when to consider only open intervals I do something like

when
  device: Device()
  executionState: ExecutionStateEvent(deviceId == device.id, name ==
"STOPPED") from entry-point "mtconnect"
  not (DowntimeInterval(deviceId == device.id, open == true, this includes
executionState) from entry-point "downtime")

This is not going to work for all situations, but its a pattern in the
toolbox.

-barry
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