TakeEveryUSERF

TakeEveryUSERF is a concurrency primitive in a hypothetical USERF library designed to handle user-related events by spawning a separate worker for each event that matches a given pattern. It enables non-blocking, parallel processing of user actions.

API and behavior are designed to be simple: takeEveryUSERF accepts at least two arguments—a pattern (such as an action type or predicate) and a worker function that processes a single event. An optional options object may supply settings such as concurrency limits, error handling, or cancellation behavior. The call returns a handle or task reference that can be used to cancel listening.

The primitive subscribes to an event stream. For each incoming event that matches the pattern, it creates a new worker invocation with the event payload. All workers run concurrently; there is no automatic cancellation of in-flight workers when a new event arrives, unless the library option enforces it.

Error handling can vary by implementation. By default, errors in a worker are reported to a global error handler, but an onError option may be supplied to customize handling.

Use cases for takeEveryUSERF include scenarios where every matching event must be processed, such as logging user actions, updating multiple resources, or triggering independent workflow steps. It contrasts with takeLatest-style patterns, which cancel previous workers to process only the most recent event.

See also: takeEvery, Redux-Saga takeEvery pattern, event-driven programming, concurrency control, USERF library.