eventfired

Eventfired is a term used in event-driven programming to denote the moment an event is emitted by a source and dispatched to listeners. The term is informal but widely understood across programming languages and frameworks as the completion of an event firing action, distinct from the time the event is created or scheduled.

In practice, an eventfired occurs when the event system invokes the registered handlers for a given event name or type, often with a payload of data. The exact timing depends on the framework and may be synchronous or asynchronous; in many UI frameworks it is synchronous, while in distributed systems it may be asynchronous and batched.

Common characteristics include: an event identifier (name or type), an optional payload, a timestamp, and a source. Some systems attach a correlation or trace identifier to support end-to-end diagnostics. Eventfired states can be logged for performance analysis, to measure latency, or used to trigger subsequent actions in a pipeline or state machine.

Examples: In Node.js, calling EventEmitter.emit('data', payload) results in an event fired that may invoke listeners; in browser JavaScript, dispatchEvent creates and fires a DOM Event; in reactive programming, onNext represents a fired event downstream. In architecture terms, firing an event corresponds to publishing a message to a topic in a publish-subscribe system.

See also: event-driven architecture, event emission, publish-subscribe, messaging systems, event logging.