Event Source

Synonyms

Event emitter; Event producer

Definition

Event source is an entity that provides event for the processing cycle [3].

Key Points

Event sources are typically initial nodes (sending only) in the event processing networks, and provide events to the network for further processing. Event sources can be of various types:

• 1. Software module – through instrumentation

• 2. Sensors [1]

• 3. Clock/Calendar

• 4. State observers in workflows (BPM).

An event can be obtained from a source in various modes:

• 1. Push – the source initiates the event emission.

• 2. Periodic Pull – a calendar service pulls one or more events from the source (e.g., by query the log) [2].

• 3. 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.

Cross-References

• Event Processing Network

• Event Sink