-
Notifications
You must be signed in to change notification settings - Fork 154
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
feat: Add support for
for comprehensions. (#935)
- Loading branch information
Showing
5 changed files
with
162 additions
and
7 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
117 changes: 117 additions & 0 deletions
117
...-tests/src/test/scala/org/apache/pekko/stream/scaladsl/ForComprehensionsCompileSpec.scala
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,117 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
|
|
||
| package org.apache.pekko.stream.scaladsl | ||
|
|
||
| import org.apache.pekko | ||
| import pekko.Done | ||
| import pekko.japi.Util | ||
| import pekko.stream.testkit.StreamSpec | ||
| import pekko.stream.testkit.scaladsl.TestSink | ||
|
|
||
| import java.util.concurrent.CopyOnWriteArrayList | ||
| import scala.concurrent.Await | ||
| import scala.concurrent.duration.DurationInt | ||
|
|
||
| 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() | ||
| } | ||
|
|
||
| "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() | ||
| } | ||
|
|
||
| "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() | ||
|
|
||
| Await.result(future, 3.seconds) shouldBe Done | ||
| Util.immutableSeq(list) shouldBe List("2", "4") | ||
| } | ||
|
|
||
| "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() | ||
| } | ||
| } | ||
|
|
||
| "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() | ||
| } | ||
|
|
||
| "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() | ||
| } | ||
|
|
||
| "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") | ||
| } | ||
| } | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters