Aw: [akka-user] Usage of "nameLifted" in GraphDSL

Stefan Wachter Fri, 04 Mar 2016 08:35:28 -0800

A Source[Attributes] implemented by a custom GraphStage might be the solution. Is there something easier?

Gesendet: Freitag, 04. März 2016 um 17:22 Uhr
Von: "Stefan Wachter" <[email protected]>
An: "Akka User List" <[email protected]>
Betreff: [akka-user] Usage of "nameLifted" in GraphDSL

Hi all,

I have some processing logic encoded in a flow F that is constructed using the GraphDSL (Scala version). The flow is included in a larger processing graph at multiple positions. Inside of F I need a unique identifier for every instantiation (i.e. materialization) because the various materialization use a shared resource (a database) and should distinguish their usage by their id.

When using a custom GraphStage to implement the flow logic then I could the inheritedAttributes parameter that is provided with the createLogic invocation

createLogic(inheritedAttributes: Attributes): GraphStageLogic


and then use inheritedAttributes.nameLifted() as an identifier. When using the GraphDSL however, I do not see a mechanism how to inject the Attributes that will be used during materialization.

 

Does someone have a solution to this problem?

 

TIA

 

Stefan

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Aw: [akka-user] Usage of "nameLifted" in GraphDSL

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