我正在使用https://doc.akka.io/docs/alpakka-kafka/current/consumer.html 使用Kafka的数据如下：

implicit val system: ActorSystem = ActorSystem("SAPEVENTBUS")
implicit val materializer: Materializer = ActorMaterializer()

val config = system.settings.config.getConfig("akka.kafka.consumer")
val consumerSettings =
  ConsumerSettings(config, new StringDeserializer, new StringDeserializer)
    .withBootstrapServers("localhost:9092")
    .withGroupId("SAP-BUS")
    .withProperty(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest")
    .withProperty(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, "true")
    .withProperty(ConsumerConfig.AUTO_COMMIT_INTERVAL_MS_CONFIG, "5000")

val kafkaConsumer =  Consumer
  .plainSource(
    consumerSettings,
    Subscriptions.topics("SAPEVENTBUS"))
  .toMat(Sink.foreach(println))(Keep.both)
  .mapMaterializedValue(DrainingControl.apply)

接下来，我将通过akkahttpwebsocket客户端将接收到的结果转发到web服务器
如何构建websocket客户端：

implicit val system = ActorSystem()
implicit val materializer = ActorMaterializer()
import system.dispatcher

// print each incoming strict text message
val printSink: Sink[Message, Future[Done]] =
  Sink.foreach {
    case message: TextMessage.Strict =>
      println(message.text)
  }

val helloSource: Source[Message, NotUsed] =
  Source.single(TextMessage("hello world!"))

// the Future[Done] is the materialized value of Sink.foreach
// and it is completed when the stream completes
val flow: Flow[Message, Message, Future[Done]] =
  Flow.fromSinkAndSourceMat(printSink, helloSource)(Keep.left)

// upgradeResponse is a Future[WebSocketUpgradeResponse] that
// completes or fails when the connection succeeds or fails
// and closed is a Future[Done] representing the stream completion from above
val (upgradeResponse, closed) =
  Http().singleWebSocketRequest(WebSocketRequest("ws://echo.websocket.org"), flow)

val connected = upgradeResponse.map { upgrade =>
  // just like a regular http request we can access response status which is available via upgrade.response.status
  // status code 101 (Switching Protocols) indicates that server support WebSockets
  if (upgrade.response.status == StatusCodes.SwitchingProtocols) {
    Done
  } else {
    throw new RuntimeException(s"Connection failed: ${upgrade.response.status}")
  }
}

我有两个问题：
如何将使用者和websocket客户机组合成一个流，并让它将消息发送到Web服务器。
我想广播接收到的消息从网络服务器到两个接收器取决于内容。
如何建立这样一个图表？