Sorry, I guess the question doesn't make sense since I'm dealing with a
stream of paths rather than one. I can certainly create a composite source
as follows.
def intervalLinesForPath(path: Path): Source[String, Future[Long]] = {
val file = path.toFile
val fileSource: Source[ByteString, Future[Long]] = FileIO.fromFile(file)
// chunksize parameter
val asLines: Source[ByteString, Future[Long]] = fileSource.via(Framing
.delimiter(ByteString(System.lineSeparator), maximumFrameLength = 512,
allowTruncation = true))
val asStrings: Source[String, Future[Long]] = asLines.map { bs =>
bs.utf8String
}
asStrings
}
On Mon, Feb 8, 2016 at 12:46 PM, Richard Rodseth <[email protected]> wrote:
> I'm trying to capture a file read in a reusable Flow as follows. But I'm
> scratching my head about how to capture the materialized value. As it
> stands the signature of result is Flow[Path, String, Unit] rather than
> Flow[Path, String, Future[Long]]. I've tried various combinations of viaMat
> and mapMaterializedValue but haven't been able to get the signatures right.
> What am I missing? Thanks in advance.
>
> def pathToIntervalLines: Flow[Path,String, Future[Long]] = {
>
> val result = Flow[Path].flatMapConcat { path =>
>
> val file = path.toFile
>
> val fileSource: Source[ByteString, Future[Long]] = FileIO.fromFile(
> file)
>
> val asLines : Source[ByteString, Future[Long]] = fileSource.via(
> Framing.delimiter(ByteString(System.lineSeparator), maximumFrameLength =
> 512, allowTruncation = true))
>
> val asStrings : Source[String, Future[Long]] = asLines.map { bs =>
> bs.utf8String }
>
> asStrings
>
> }
>
> result
>
> }
>
>
>
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