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Nov 19th, 2017
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  1. val roomsTemperatureReadings =
  2.  Stream.continually(TemperatureReading(randomRoom, randomTemperature))
  3.  
  4. Source(roomsTemperatureReadings)
  5.  .alsoTo(Sink.foreach(reading => createRoomIfNotExist(reading.roomId)))
  6.  .to(Sink.foreach(saveReading))
  7.  .run()
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