Completedevent

Completedevent is a generic term used in software development to denote an event emitted when an asynchronous operation finishes. It is used in event-driven architectures and in user-interface frameworks to notify listeners that a task has reached its terminal state, whether successful or failed. Completedevent is not a universal standard and its exact form varies by platform, but it is commonly implemented as a custom event or message with a payload that summarizes the outcome.

In practice, a completedevent is typically dispatched after an operation completes. Listeners register before the operation begins and respond to the event by processing the result, performing follow-up actions, or triggering error-handling logic. In web programming, completedevent is often modeled as a CustomEvent with a detail object containing fields such as success (boolean), result (any), error (string or error object), timestamp, and duration. In other environments, the event might be represented as a message or a callback invocation.

Best practices include providing a clear contract for the detail payload, avoiding blocking work in event handlers, and ensuring that listeners can safely ignore events they do not care about. When cancellation or retries are part of the workflow, the design may include additional fields such as canceled (boolean) or retryCount.

Relationship to related concepts: completedevent contrasts with progress events that report ongoing activity and with error events that report failures without implying completion. It often forms part of promise- or future-based architectures, where the completion state is the natural signal for subsequent steps.

Limitations: because completedevent is not standardized, naming and payload conventions vary; interoperation requires explicit documentation of the event type and its payload.