I have a few questions if this doesn't solve your issue, but how about
something as simple as:
(pmap (partial map handler) (partition-by splitter collection))
partition-by is lazy, and pmap is lazy-ish.
On Friday, June 16, 2017 at 10:13:11 AM UTC-4, Tom Connors wrote:
>
> I'm looking for a function that would likely be named something like
> "sequential-by" or "parallel-per" that takes some data-producing thing like
> a lazy seq or a core async channel, a function to split records from that
> input, and a function to handle each item. Each item with an identical
> return value from the "split" function would be handled sequentially, while
> the handling of the collection as a whole would be parallel.
>
> If we assume this signature:
> (parallel-per splitter handler inputs)
>
>
> Calling it like this:
> (parallel-per :id
> (fn [m] (prn (update m :val inc)))
> [{:id 1 :val 1}, {:id 1 :val 2}, {:id 3 :val 1}])
>
>
> Would result in the first two maps being handled sequentially, while the
> third map is handled in parallel with the first two. The order of the
> printed lines would probably be non-deterministic, except {:id 1 :val 2}
> would be printed before {:id 1 :val 3}.
>
> Note that for my use case I don't care about return values, but if
> something like this already exists it's plausible that it returns something
> equivalent to (map handler inputs).
>
> Does anything like this already exist in core or some lib? If not, any
> recommendations for how to build it?
>
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