I'm updating from
com.typesafe.akka:akka-stream-experimental_2.10:1.0-M4
to
com.typesafe.akka:akka-stream-experimental_2.10:1.0-M4
but there are no classes like UndefinedSource, UndefinedSink, BlackholeSink, SubscriberSink, OnCompleteSink and others.
There is no documentation why it was removed and which approach to be taken now instead of this class.
Though in the documentation of this version I still see the notion of UndefinedSource
> The way we constructed a Flow using a PartialFlowGraph is explained in
> detail in Constructing Sources, Sinks and Flows from Partial Graphs,
> however the basic concepts is rather simple– we can encapsulate
> arbitrarily complex logic within a Flow as long as it exposes the same
> interface, which means exposing exactly one UndefinedSink and exactly
> one UndefinedSource which will be connected to the TCP pipeline. In
> this example we use a Concat graph processing stage to inject the
> initial message, and then continue with handling all incoming data
> using the echo handler. You should use this pattern of encapsulating
> complex logic in Flows and attaching those to StreamIO in order to
> implement your custom and possibly sophisticated TCP servers.
Seems to be that the documentation is wrong or some extra dependencies are required now