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feat: Add support for
for comprehensions. (#935)
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117 changes: 117 additions & 0 deletions
117
...-tests/src/test/scala/org/apache/pekko/stream/scaladsl/ForComprehensionsCompileSpec.scala
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| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one or more | ||
| * contributor license agreements. See the NOTICE file distributed with | ||
| * this work for additional information regarding copyright ownership. | ||
| * The ASF licenses this file to You under the Apache License, Version 2.0 | ||
| * (the "License"); you may not use this file except in compliance with | ||
| * the License. You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
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| package org.apache.pekko.stream.scaladsl | ||
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| import org.apache.pekko | ||
| import pekko.Done | ||
| import pekko.japi.Util | ||
| import pekko.stream.testkit.StreamSpec | ||
| import pekko.stream.testkit.scaladsl.TestSink | ||
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| import java.util.concurrent.CopyOnWriteArrayList | ||
| import scala.concurrent.Await | ||
| import scala.concurrent.duration.DurationInt | ||
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| class ForComprehensionsCompileSpec extends StreamSpec { | ||
| "A Source" must { | ||
| "be able to be used in a for comprehension which yield" in { | ||
| val source = Source(1 to 5) | ||
| val evenSource = for { | ||
| i <- source if i % 2 == 0 | ||
| } yield i.toString | ||
| evenSource.runWith(TestSink[String]()) | ||
| .request(5) | ||
| .expectNextN(List("2", "4")) | ||
| .expectComplete() | ||
| } | ||
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| "be able to be used in a for comprehension which flatMap" in { | ||
| val source = Source(1 to 5) | ||
| val evenSource = for { | ||
| i <- source if i % 2 == 0 | ||
| j <- Source.lazySingle(() => i) | ||
| str = j.toString | ||
| } yield str | ||
| evenSource.runWith(TestSink[String]()) | ||
| .request(5) | ||
| .expectNextN(List("2", "4")) | ||
| .expectComplete() | ||
| } | ||
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| "be able to be used in a for comprehension which yield a runnable graph" in { | ||
| val source = Source(1 to 5) | ||
| val list = new CopyOnWriteArrayList[String]() | ||
| val future = (for (i <- source if i % 2 == 0) { | ||
| list.add(i.toString) | ||
| }).run() | ||
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| Await.result(future, 3.seconds) shouldBe Done | ||
| Util.immutableSeq(list) shouldBe List("2", "4") | ||
| } | ||
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| "be able to be used in a for comprehension which with Flow" in { | ||
| (for { | ||
| i <- Source(1 to 20) if i % 2 == 0 | ||
| j <- Source.lazySingle(() => i) | ||
| str = j.toString | ||
| } yield str) | ||
| .via(for { | ||
| str <- Flow[String] if str.length > 1 | ||
| doubleStr = str + str | ||
| number <- Source.lazySingle(() => doubleStr) | ||
| } yield number.toInt) | ||
| .runWith(TestSink[Int]()) | ||
| .request(6) | ||
| .expectNextN(List(1010, 1212, 1414, 1616, 1818, 2020)) | ||
| .expectComplete() | ||
| } | ||
| } | ||
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| "A Flow" must { | ||
| "be able to be used in a for comprehension which yield" in { | ||
| Source(1 to 5).via(for (i <- Flow[Int] if i % 2 == 0) yield i.toString) | ||
| .runWith(TestSink[String]()) | ||
| .request(5) | ||
| .expectNextN(List("2", "4")) | ||
| .expectComplete() | ||
| } | ||
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| "be able to be used in a for comprehension which flatmap" in { | ||
| Source(1 to 5).via(for { | ||
| i <- Flow[Int] if i % 2 == 0 | ||
| j <- Source.single(i) | ||
| str = j.toString | ||
| } yield str) | ||
| .runWith(TestSink[String]()) | ||
| .request(5) | ||
| .expectNextN(List("2", "4")) | ||
| .expectComplete() | ||
| } | ||
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| "be able to be used in a for comprehension which yield a sink" in { | ||
| val source = Source(1 to 5) | ||
| val list = new CopyOnWriteArrayList[String]() | ||
| val sink = for (i <- Flow[Int] if i % 2 == 0) { | ||
| list.add(i.toString) | ||
| } | ||
| val future = source.runWith(sink) | ||
| Await.result(future, 3.seconds) shouldBe Done | ||
| Util.immutableSeq(list) shouldBe List("2", "4") | ||
| } | ||
| } | ||
| } |
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