groupedWithin
Chunk up this stream into groups of elements received within a time window, or limited by the number of the elements, whatever happens first.
Signature
Source.groupedWithinSource.groupedWithin Flow.groupedWithinFlow.groupedWithin
Description
Chunk up this stream into groups of elements received within a time window, or limited by the number of the elements, whatever happens first. Empty groups will not be emitted if no elements are received from upstream. The last group before end-of-stream will contain the buffered elements since the previously emitted group.
See also:
- grouped for a variant that groups based on number of elements
- groupedWeighted for a variant that groups based on element weight
- groupedWeightedWithin for a variant that groups based on element weight and a time window
Reactive Streams semantics
emits when the configured time elapses since the last group has been emitted, but not if no elements has been grouped (i.e: no empty groups), or when limit has been reached.
backpressures downstream backpressures, and there are n+1 buffered elements
completes when upstream completes