I just tried the following (on 2.0-M1):
scala> Source(1 to 100).map{i ⇒ println(i);
i}.grouped(10).runWith(Sink.head)
1
2
3
4
5
6
7
8
9
10
11
res10: scala.concurrent.Future[scala.collection.immutable.Seq[Int]] =
scala.concurrent.impl.Promise$DefaultPromise@2df79942
12
13
14
15
16
scala> 17
18
19
20
21
22
23
24
res10.onComplete(println)
Success(Vector(1, 2, 3, 4, 5, 6, 7, 8, 9, 10))
A similar behavior can be seen for the take function:
scala> Source(1 to 100).map{i ⇒ println(i);
i}.take(10).runWith(Sink.fold(Vector[Int]())(_ :+ _))
...
As one can see, the stream processes more elements than it has to. It is
not a problem for me, but I would like to know if this behavior is spec'ed
anywhere? Shouldn't the stream be able to say, just by looking at the
arguments for grouped, take and the sink, how many elements should be
produced?
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