use zip method
On Sunday, 22 November 2015 23:49:14 UTC+8, Muki wrote:
> I have a stream pipeline like this:
> progress queue +---------> mapping +---------+
> ^ ^ ^ |
> | | | v
> | | +------------------------+ +-- merge +--->
> | | | ^
> | +---------+ | |
> + + + |
> data +--------> stage1 +--------> stage2 +----+
> - *data* is a single source that generates the data to be processed
> - *progress queue* is a
> Source.queue[Progress](10, OverflowStrategy.dropHead) where the
> progress should be emitted
> - *stage1 *and* stage2* are emitting elements to the next stage and
> also the the *progress queue*
> So these are actually two different data pipelines, which are only
> connected by the *progress queue* and the *merge* in the end.
> The initial implementation just sent messages to a progress actor, which
> then send it over a play-websocket. Now I want to do this
> with akka-http and the websocket describes as a Flow[Message, Message].
> I read "Accessing the materialized value inside the Graph"
> but couldn't figure out how to implement this kind of pattern.
> Thanks in advance,
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