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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