Esper absence of event for dynamic list

Asked Jul 18 '12 at 07:30

Active Jul 18 '12 at 08:13

Viewed 232 times

I'm trying to figure out a basic scenario to determine if I should base an alerting application on Esper.

I have a set of sensors that change dynamically over time. Each of these are configured with a timeout that defines how often I should receive a Reading for the sensor. I want Esper to inform me when a Reading has not arrived in time.

Using this event pattern it seems to work, although I have no way of altering the set of sensors once Esper is started.

every s=Sensor -> (every (timer:interval(s.Timeout sec) and not Reading(SensorId=s.SensorId)))

How could I achieve this? I'm guessing that I need to change the "every s=Sensor" part into something different since events are immutable.

edited Jul 18 '12 at 08:13

asked Jul 18 '12 at 07:30

kfuglsang

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This is already handling any number of sensor-ids....your questions doesn't make any sense. – goodie Aug 03 '16 at 01:49
See this link: http://espertech.com/esper/solution_patterns.php#absence-8 – goodie Sep 15 '16 at 17:08
Or this one: http://espertech.com/esper/solution_patterns.php#large_number_statements – goodie Sep 15 '16 at 17:09

Esper absence of event for dynamic list

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