Hi Richard,
There is no other way to detect whether a Source is empty than to run it.
For example if a Source wraps a DB query then of course it is impossible to
see if the query will be empty or not without actually materializing and
hence running the query.
-Endre
On Mon, Mar 21, 2016 at 4:59 AM, Richard Rodseth <rrods...@gmail.com> wrote:
> I'm doing a flatMapMerge something like this:
>
> val stream = Source(channelMonths)
>
> .flatMapMerge(10, channelMonth => {
>
> .. Sources.intervalsForChannelMonth(channelMonth, ...)
>
> })
>
> I'm implementing some monitoring using alsoTo to send stream elements to a
> monitoring actor which can keep counts and so forth.
>
> How could I detect that the intervals source is sometimes empty? eg.
> record the channels for which there are 0 intervals?
>
>
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