PhysicalNode

case class FanOut[T](targets: Seq[PhysicalNode[T]]) extends PhysicalNode[T] with Product with Serializable

This is a convenience that pushes each item it receieves a sequence of other PhysicalNodes.
This is a convenience that pushes each item it receieves a sequence of other PhysicalNodes. This is so we don't have to deal with the notion of fan-out on the summingbird graph (multiple consumers from a single node) in each type of node.
case class FlatMap[I, O](fn: (I) ⇒ TraversableOnce[O], target: PhysicalNode[O]) extends PhysicalNode[I] with Product with Serializable

This is the PhysicalNode that implements flatMap and sends it on to the next Node.
case class Join[K, V, W](service: (K) ⇒ Option[W], target: PhysicalNode[(K, (V, Option[W]))]) extends PhysicalNode[(K, V)] with Product with Serializable
case class SourceNode[O](data: TraversableOnce[O], next: PhysicalNode[O]) extends ConcurrentMemoryPlan with PhysicalNode[Nothing] with Product with Serializable
case class Sum[K, V](store: ConcurrentHashMap[K, V], sg: Semigroup[V], target: PhysicalNode[(K, (Option[V], V))]) extends PhysicalNode[(K, V)] with Product with Serializable
case class Writer[T](queue: BlockingQueue[T], target: PhysicalNode[T]) extends PhysicalNode[T] with Product with Serializable

This does a write and after that succeeds, pushes onto the next node (which may be the NullTarget)

final def !=(arg0: Any): Boolean

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final def ##(): Int

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final def ==(arg0: Any): Boolean

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object NullTarget extends PhysicalNode[Any] with Product with Serializable

This target is the end of the line for a target that has no dependants.
final def asInstanceOf[T0]: T0

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def clone(): AnyRef

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final def eq(arg0: AnyRef): Boolean

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def equals(arg0: Any): Boolean

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def finalize(): Unit

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@throws( classOf[java.lang.Throwable] )
final def getClass(): Class[_]

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def hashCode(): Int

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final def isInstanceOf[T0]: Boolean

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final def ne(arg0: AnyRef): Boolean

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final def notify(): Unit

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final def notifyAll(): Unit

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final def synchronized[T0](arg0: ⇒ T0): T0

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def toString(): String

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final def wait(): Unit

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final def wait(arg0: Long, arg1: Int): Unit

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final def wait(arg0: Long): Unit

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