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#19444 simplify signature of FlowOps.expand

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Any previous usage can be represented in this fashion while typically
saving one function allocation and also saving the function literal’s
syntax overhead (for the seed). Plus a new feature: the provided
iterator does not have to be infinite, limiting how far expand is
allowed to go.
This commit is contained in:
Roland Kuhn 2016-01-18 11:29:14 +01:00
parent a12451e007
commit 7463c50fc9
16 changed files with 127 additions and 151 deletions
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22
akka-stream-tests/src/test/scala/akka/stream/impl/fusing/InterpreterSpec.scala
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@ -273,9 +273,7 @@ class InterpreterSpec extends AkkaSpec with GraphInterpreterSpecKit {
lastEvents() should be(Set(Cancel))
}
"implement expand" in new OneBoundedSetup[Int](Seq(Expand(
(in: Int) ⇒ in,
(agg: Int) ⇒ (agg, agg)))) {
"implement expand" in new OneBoundedSetup[Int](new Expand(Iterator.continually(_: Int))) {
lastEvents() should be(Set(RequestOne))
@ -339,13 +337,9 @@ class InterpreterSpec extends AkkaSpec with GraphInterpreterSpecKit {
}
"work with expand-expand" in new OneBoundedSetup[Int](Seq(
Expand(
(in: Int) ⇒ in,
(agg: Int) ⇒ (agg, agg + 1)),
Expand(
(in: Int) ⇒ in,
(agg: Int) ⇒ (agg, agg + 1)))) {
"work with expand-expand" in new OneBoundedSetup[Int](
new Expand(Iterator.from),
new Expand(Iterator.from)) {
lastEvents() should be(Set(RequestOne))
@ -376,14 +370,12 @@ class InterpreterSpec extends AkkaSpec with GraphInterpreterSpecKit {
lastEvents() should be(Set(OnComplete, OnNext(12)))
}
"implement conflate-expand" in new OneBoundedSetup[Int](Seq(
"implement conflate-expand" in new OneBoundedSetup[Int](
Conflate(
(in: Int) ⇒ in,
(agg: Int, x: Int) ⇒ agg + x,
stoppingDecider),
Expand(
(in: Int) ⇒ in,
(agg: Int) ⇒ (agg, agg)))) {
stoppingDecider).toGS,
new Expand(Iterator.continually(_: Int))) {
lastEvents() should be(Set(RequestOne))