Question

我收到以下错误：

java.lang.IllegalArgumentException: requirement failed: The inlets [] and outlets [BlockOut.out] must correspond to the inlets [] and outlets [BlockOut.out]

我有一个非常简单的图表：

val g1 = GraphDSL.create() { implicit builder =>
  import GraphDSL.Implicits._

  val in: Source[ByteString, Any] = Source.single(ByteString(digest))
  val flow: GraphStage[FlowShape[ByteString, ByteString]] = new ReadBlockStage(dataStore, blockingExecutionContext)

  in ~> flow

  SourceShape(flow.shape.out)
}

val sourceGraph: Source[ByteString, NotUsed] = Source.fromGraph(g1)

我的流程定义如下：

class ReadBlockStage(dataStore: DataStore, implicit val exceutionContext: ExecutionContext) extends GraphStage[FlowShape[ByteString, ByteString]] with DefaultJsonProtocol {
  val in = Inlet[ByteString]("DigestSpec.in")
  val out = Outlet[ByteString]("BlockOut.out")
  override val shape = FlowShape.of(in, out)
  ...
}

为什么我收到此错误？流程＆＃34; out＆＃34;端口的类型为Outlet[ByteString]，我的Source为Source[ByteString, NotUsed]。错误消息非常混乱，因为它看起来像形状和预期的形状是相同的。

Answer 1

我想出了这个问题。我忘了为每个图元素执行builder.add（）。

Akka Streams入口和出口不匹配

1 个答案: