Hi -
I am trying to migrate some akka-streams code from an earlier version
(akka-stream-experimental 1.0.RC4) .. please have a look at the following ..
/**
* Create multiple streams out of a single stream. The stream
"transactions" is being
* demultiplexed into many streams split by account number. Each of the
sub-streams are
* then materialized to the fold sink "txnSink", which folds each of the
transaction
* substreams to compute the net value of the transaction for that account
*/
val netTxn: Source[RunnableGraph[Future[Transaction]], Unit] =
transactions.map(validate).groupBy(_.accountNo).map { case (a, s) =>
s.toMat(txnSink)(Keep.right) }
I am trying to create substreams based on a field accountNo within a
Transaction. Then I pass each substream to toMat with a Sink which is a
fold Sink defined as below ..
/**
* Would like to fold transactions through monoid append
*/
val txnSink: Sink[Transaction, Future[Transaction]] =
Sink.fold[Transaction, Transaction](TransactionMonoid.zero)(_ |+| _)
The idea is to apply a monoid over each substream and do some netting on
transactions belonging to the same accountNo.
How can I migrate this to 2.4.4 ? Now groupBy returns a Subflow and I am
not sure how to apply each of the substreams to the materializer. One
option that works will be to create a Map[String, Transaction] upfront and
then directly apply the monoid to the Map in the main stream and not create
any substream. But I would like to have the substreams fro some other
purpose as well.
Any help will be appreciated ..
Regards.
- Debasish
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