Event emitter; Event producer
Event source is an entity that provides event for the processing cycle .
Software module – through instrumentation
State observers in workflows (BPM).
Push – the source initiates the event emission.
Periodic Pull – a calendar service pulls one or more events from the source (e.g., by query the log) .
On-Demand Pull – an event processing agent pulls the source using request/reply protocol.
Getting events from event sources to processing typically requires adapter to create the event in the desired format.
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