…and, an empty source is one which signals onComplete before any data has
passed through. :)
On Tue, Mar 22, 2016 at 10:58 AM, Akka Team <akka.offic...@gmail.com> wrote:
> 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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>
>
>
> --
> Akka Team
> Typesafe - Reactive apps on the JVM
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>
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Cheers,
√
--
>>>>>>>>>> Read the docs: http://akka.io/docs/
>>>>>>>>>> Check the FAQ:
>>>>>>>>>> http://doc.akka.io/docs/akka/current/additional/faq.html
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