akka/akka-core

Should we make Merges easier to treat as Sources?

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#23,032 opened on May 25, 2017

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Description

As mentioned by @QmQvl on gitter: is mergePreferred (http://doc.akka.io/docs/akka/current/scala/stream/stages-overview.html#mergepreferred) not available outside GraphDSL? having to write at least 4-5 lines of ceremonious code is not that much cleaner, arguably 馃檭

There is some truth to that - as we know the GraphDSL is the "power user mode", yet already for a MergePreferred people need to drop down to it.

Should we re-consider and make all Merges be usable as "merge these things and give me a source"? I personally think it would be nicer this way, sending in a proposal PR.

Contributor guide

Tech stack
scala
Domain
backend
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Akka Streams basicsScala
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40
Research direction
Review the current MergePreferred API and its usage outside GraphDSL. Explore how to simplify the syntax for treating MergePreferred as a Source. Consider proposing a PR that adds a convenience method or simplifies the GraphDSL requirement. Reference the Gitter discussion and the Akka documentation for MergePreferred.
Should we make Merges easier to treat as Sources? 路 akka/akka-core#23032 | Good First Issue