Flow.chunked with specified time period

[gmarchelos]

Currently Flow supports only buffer operator with capacity.
It would be useful to buffer elements within specified time range.
flow.buffer(Duration.ofSeconds(5)).collect {...}

[qwwdfsad]

Could you please explain a bit your use-case? E.g. what kind of domain-specific problem you would like to solve with such operator

[fvasco]

I need to batch live events to reduce synchronization cost and limit refresh rate.

Currently I implemented this feature in my project: events are sent to a channel and batched to 10Hz in an event bus.

[gmarchelos]

I have flow of trades and I need to collect trades within specified timespan (it's high probability for many trades to occur within 1-5 sec) and then do some processing of collected trades.
It's costly for me to process trades one by one so I would like to have buffer operator that collects events within specified timespan.

[elizarov]

Thanks. This kind of operator would be called chunked in Kotlin lingo. Thanks for spelling out a use-case with a time-limit chunking. See #1290 for a size-limited use-case.

[PaulWoitaschek]

I'm in need of this too. My use case is as following:

I implemented a barcode scanner which scans the camera input live. That means that I get barcode results every few milliseconds.
However the barcode implementation is not perfect and sometimes detects a wrong barcode.
For that case I want consume the barcode events chunked in 2 second windows and pick the barcode that was detected most frequently.

[ps-feng]

 @PaulWoitaschek I had a requirement for a similar (though not exactly the same operator) and ended up implementing my own (final implementation at the end), if it helps.