I'll take a look - thanks. I'm trying to see how to enrich a stream with perhaps a second stream. So, for example, if I have a stream of real-time game stats coming in, I may have a playerId. I may want to enrich that incoming stream with info about the player from the MasterPlayer stream (full name, for instance). It's a contrived example, but I'm really trying to enrich incoming streams. Spark Streaming and Azure Stream Analytics allow for this -- just curious how this is done or could be done with Akka Streams.