How can the timestamp for an event be explicitly controlled?
In Esper the concept of time is under the control of an application via CurrentTimeEvent at the level of the runtime and at the level of statements via isolated service provider. The event arrival time is the time the runtime or isolated service is currently at, when the event is made known to the runtime or isolated service. This allows any number of time dimensions to be controlled separately, such as event originating time or transmitted time for example. Use the time-order view (ext:time_order) to reorder events arriving out-of-order. The time order view can operate on a timestamp event property that is part of your event.
