akka/akka-core

Convenience for attributes on Sink

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#30,199 opened on 2021年4月22日

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 (5 comments) (0 reactions) (0 assignees)Scala (13,277 stars) (3,547 forks)batch import
1 - triagedhelp wantedt:stream

説明

When working on https://github.com/akka/akka-persistence-cassandra/pull/888 I realized that it wasn't obvious how to set a dispatcher all the way to the Sink (and not introduce async boundary).

My first thought, when I didn't realize that the Sink is also involved, was:

.map(stuff)
.withAttributes(ActorAttributes.dispatcher(theDispatcher))
.runWith(Sink.ignore)

but it should be:

.map(stuff)
.toMat(Sink.ignore)(Keep.right)
.withAttributes(ActorAttributes.dispatcher(theDispatcher))
.run()

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