add zipLatest and zipLatestWith operators and graphstages
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Jonas Chapuis
parent
25079cb568
commit
a098e0b743
17 changed files with 1104 additions and 1 deletions
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/*
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* Copyright (C) 2018 Lightbend Inc. <https://www.lightbend.com>
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*/
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package akka.stream.scaladsl
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import akka.stream._
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import akka.stream.testkit._
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import akka.testkit.EventFilter
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import org.reactivestreams.Publisher
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import scala.concurrent.duration._
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import scala.language.postfixOps
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class GraphZipLatestWithSpec extends TwoStreamsSetup {
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import GraphDSL.Implicits._
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override type Outputs = Int
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override def fixture(b: GraphDSL.Builder[_]): Fixture = new Fixture(b) {
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val zip = b.add(ZipWith((_: Int) + (_: Int)))
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override def left: Inlet[Int] = zip.in0
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override def right: Inlet[Int] = zip.in1
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override def out: Outlet[Int] = zip.out
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}
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override def setup(p1: Publisher[Int], p2: Publisher[Int]) = {
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val subscriber = TestSubscriber.probe[Outputs]()
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Source.fromPublisher(p1).zipLatestWith(Source.fromPublisher(p2))(_ + _).runWith(Sink.fromSubscriber(subscriber))
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subscriber
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}
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"ZipLatestWith" must {
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"work in the happy case" in {
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val upstreamProbe = TestPublisher.manualProbe[Int]()
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val downstreamProbe = TestSubscriber.manualProbe[Outputs]()
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RunnableGraph
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.fromGraph(GraphDSL.create() { implicit b ⇒
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val zipLatest = b.add(ZipLatestWith((_: Int) + (_: Int)))
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val never = Source.single(3).initialDelay(1 day)
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Source(1 to 2).concat(never) ~> zipLatest.in0
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Source.fromPublisher(upstreamProbe) ~> zipLatest.in1
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zipLatest.out ~> Sink.fromSubscriber(downstreamProbe)
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ClosedShape
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})
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.run()
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val upstreamSubscription = upstreamProbe.expectSubscription()
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val downstreamSubscription = downstreamProbe.expectSubscription()
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upstreamSubscription.sendNext(10)
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downstreamSubscription.request(2)
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downstreamProbe.expectNext(11)
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downstreamProbe.expectNext(12)
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upstreamSubscription.sendNext(20)
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downstreamSubscription.request(1)
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downstreamProbe.expectNext(22)
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upstreamSubscription.sendNext(30)
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downstreamSubscription.request(1)
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downstreamProbe.expectNext(32)
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upstreamSubscription.sendComplete()
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downstreamProbe.expectComplete()
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}
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"work in the sad case" in {
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val probe = TestSubscriber.manualProbe[Outputs]()
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RunnableGraph
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.fromGraph(GraphDSL.create() { implicit b ⇒
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val zip = b.add(ZipLatestWith[Int, Int, Int]((_: Int) / (_: Int)))
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val never = Source.single(2).initialDelay(1 day)
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Source.single(1).concat(never) ~> zip.in0
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Source(-2 to 2) ~> zip.in1
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zip.out ~> Sink.fromSubscriber(probe)
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ClosedShape
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})
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.run()
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val subscription = probe.expectSubscription()
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subscription.request(2)
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probe.expectNext(1 / -2)
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probe.expectNext(1 / -1)
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EventFilter[ArithmeticException](occurrences = 1).intercept {
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subscription.request(2)
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}
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probe.expectError() match {
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case a: java.lang.ArithmeticException ⇒
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a.getMessage should be("/ by zero")
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}
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probe.expectNoMsg(200.millis)
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}
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commonTests()
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"work with one immediately completed and one nonempty publisher" in {
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val subscriber1 = setup(completedPublisher, nonemptyPublisher(1 to 4))
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subscriber1.expectSubscriptionAndComplete()
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val subscriber2 = setup(nonemptyPublisher(1 to 4), completedPublisher)
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subscriber2.expectSubscriptionAndComplete()
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}
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"work with one delayed completed and one nonempty publisher" in {
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val subscriber1 =
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setup(soonToCompletePublisher, nonemptyPublisher(1 to 4))
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subscriber1.expectSubscriptionAndComplete()
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val subscriber2 =
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setup(nonemptyPublisher(1 to 4), soonToCompletePublisher)
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subscriber2.expectSubscriptionAndComplete()
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}
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"work with one immediately failed and one nonempty publisher" in {
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val subscriber1 = setup(failedPublisher, nonemptyPublisher(1 to 4))
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subscriber1.expectSubscriptionAndError(TestException)
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val subscriber2 = setup(nonemptyPublisher(1 to 4), failedPublisher)
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subscriber2.expectSubscriptionAndError(TestException)
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}
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"work with one delayed failed and one nonempty publisher" in {
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val subscriber1 = setup(soonToFailPublisher, nonemptyPublisher(1 to 4))
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subscriber1.expectSubscriptionAndError(TestException)
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val subscriber2 = setup(nonemptyPublisher(1 to 4), soonToFailPublisher)
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val subscription2 = subscriber2.expectSubscriptionAndError(TestException)
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}
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"zipLatestWith a ETA expanded Person.apply (3 inputs)" in {
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val upstreamProbe = TestPublisher.manualProbe[Int]()
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val downstreamProbe = TestSubscriber.manualProbe[Person]()
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case class Person(name: String, surname: String, int: Int)
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RunnableGraph
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.fromGraph(GraphDSL.create() { implicit b ⇒
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val zip = b.add(ZipLatestWith(Person.apply _))
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Source.repeat("Caplin") ~> zip.in0
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Source.repeat("Capybara") ~> zip.in1
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Source.fromPublisher(upstreamProbe).take(1) ~> zip.in2
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zip.out ~> Sink.fromSubscriber(downstreamProbe)
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ClosedShape
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})
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.run()
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val downstreamSubscription = downstreamProbe.expectSubscription()
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val upstreamSubscription = upstreamProbe.expectSubscription()
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downstreamSubscription.request(1)
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upstreamSubscription.sendNext(3)
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downstreamProbe.expectNext(Person("Caplin", "Capybara", 3))
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downstreamProbe.expectComplete()
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}
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"work with up to 22 inputs" in {
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val downstreamProbe = TestSubscriber.manualProbe[String]()
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val upstreamProbe = TestPublisher.manualProbe[Int]()
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RunnableGraph
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.fromGraph(GraphDSL.create() { implicit b ⇒
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val sum19 = (v1: Int,
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v2: String,
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v3: Int,
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v4: String,
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v5: Int,
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v6: String,
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v7: Int,
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v8: String,
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v9: Int,
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v10: String,
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v11: Int,
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v12: String,
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v13: Int,
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v14: String,
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v15: Int,
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v16: String,
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v17: Int,
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v18: String,
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v19: Int) ⇒
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v1 + v2 + v3 + v4 + v5 + v6 + v7 + v8 + v9 + v10 +
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v11 + v12 + v13 + v14 + v15 + v16 + v17 + v18 + v19
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// odd input ports will be Int, even input ports will be String
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val zip = b.add(ZipLatestWith(sum19))
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Source.repeat(1) ~> zip.in0
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Source.repeat(2).map(_.toString) ~> zip.in1
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Source.repeat(3) ~> zip.in2
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Source.repeat(4).map(_.toString) ~> zip.in3
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Source.repeat(5) ~> zip.in4
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Source.repeat(6).map(_.toString) ~> zip.in5
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Source.repeat(7) ~> zip.in6
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Source.repeat(8).map(_.toString) ~> zip.in7
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Source.repeat(9) ~> zip.in8
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Source.repeat(10).map(_.toString) ~> zip.in9
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Source.repeat(11) ~> zip.in10
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Source.repeat(12).map(_.toString) ~> zip.in11
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Source.repeat(13) ~> zip.in12
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Source.repeat(14).map(_.toString) ~> zip.in13
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Source.repeat(15) ~> zip.in14
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Source.repeat(16).map(_.toString) ~> zip.in15
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Source.repeat(17) ~> zip.in16
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Source.repeat(18).map(_.toString) ~> zip.in17
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Source.fromPublisher(upstreamProbe) ~> zip.in18
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zip.out ~> Sink.fromSubscriber(downstreamProbe)
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ClosedShape
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})
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.run()
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val downstreamSubscription = downstreamProbe.expectSubscription()
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val upstreamSubscription = upstreamProbe.expectSubscription()
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downstreamSubscription.request(1)
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upstreamSubscription.sendNext(19)
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upstreamSubscription.sendComplete()
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downstreamProbe.expectNext((1 to 19).mkString(""))
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downstreamProbe.expectComplete()
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}
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}
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}
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