Posted this on Stackoverflow but haven't seen any activity on it so I
figured I'd post it here as well.
I've been playing around with the experimental Akka Streams API a bit and I
have a use case that I wanted to see how to implement. For my use case, I
have a `StreamTcp` based `Flow` that is being fed from binding the input
stream of connections to my server socket. The Flow that I have is based
on `ByteString` data coming into it. The data that is coming in is going
to have a delimiter in it that means I should treat everything before the
delimiter as one message and everything after and up to the next delimiter
as the next message. So playing around with a simpler example, using no
sockets and just static text, this is what I came up with:
import akka.actor.ActorSystem
import akka.stream.{ FlowMaterializer, MaterializerSettings }
import akka.stream.scaladsl.Flow
import scala.util.{ Failure, Success }
import akka.util.ByteString
object BasicTransformation {
def main(args: Array[String]): Unit = {
implicit val system = ActorSystem("Sys")
val data = ByteString("Lorem Ipsum is simply.Dummy text of the
printing.And typesetting industry.")
Flow(data).
splitWhen(c => c == '.').
foreach{producer =>
Flow(producer).
filter(c => c != '.').
fold(new StringBuilder)((sb, c) => sb.append(c.toChar)).
map(_.toString).
filter(!_.isEmpty).
foreach(println(_)).
consume(FlowMaterializer(MaterializerSettings()))
}.
onComplete(FlowMaterializer(MaterializerSettings())) {
case any =>
system.shutdown
}
}
}
The main function on the `Flow` that I found to accomplish my goal was
`splitWhen`, which then produces additional sub-flows, one for each message
per that `.` delimiter. I then process each sub-flow with another pipeline
of steps, finally printing the individual messages at the end.
This all seems a bit verbose, to accomplish what I thought to be a pretty
simple and common use case. So my question is, is there a cleaner and less
verbose way to do this or is this the correct and preferred way to split a
stream up by a delimiter?
The link to the SO question
is:
http://stackoverflow.com/questions/25631099/how-to-split-an-inbound-stream-on-a-delimiter-character-using-akka-streams
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