Event occurrence and notification semantic
An event is the occurrence of a state transition
- sensor reaching a critical limit
- mobile user entering a network cell
- stock value increase / decrease / change
- correlation between multiple value increases …
events happen a priori unpredictably (e.g., raising an exception, sensor limit), but
delivery mechanisms are implemented via:
- (remote) method invocations (e.g., registered callbacks)
- exceptions, one-way invocations, asynchronous invocations
- (periodic) client polls