I'm talking about
http://doc.akka.io/japi/akka/current/akka/stream/javadsl/Flow.html#mapConcat-akka.japi.function.Function-
I had a flow that was emitting Iterator<T>, and I wanted a step to 'chunk'
the values to a given chunk size N (in other words, every iterator returned
by the 'chunker' would be no larger than the chunk size).
I have
Flow.<Iterator<T>>create().mapConcat(iter -> Lists.newArrayList(iter)).
grouped(chunkSize).map(list -> list.iterator())
but it kind of bugs me that I need to create an intermediate list (seems
like an unnecessary copy). I know this probably won't affect performance
perceptibly in most cases, but I wonder why Iterable was used? Are multiple
iterators ever needed to be requested from it?
I'm kind of tempted to do
Flow.<Iterator<T>>create().mapConcat(iter -> new Iterable<T>() {
@Override
public Iterator<T> iterator()
{
return iter;
}}).grouped(chunkSize).map(list -> list.iterator())
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