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Add code sample for operator Source.single (#25375)

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* Add code example for Source.single
This commit is contained in:
iyogi 2018-07-20 08:15:13 +02:00 • committed by Christopher Batey
parent 61790d763d
commit 3e698be9ce
3 changed files with 43 additions and 1 deletions
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19
akka-stream-tests/src/test/java/akka/stream/javadsl/SourceTest.java
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@ -12,7 +12,10 @@ import akka.actor.Status;
import akka.japi.Pair;
import akka.japi.function.*;
import akka.japi.pf.PFBuilder;
//#imports
import akka.stream.*;
//#imports
import akka.stream.scaladsl.FlowSpec;
import akka.util.ConstantFun;
import akka.stream.stage.*;
@ -328,6 +331,22 @@ public class SourceTest extends StreamTest {
assertEquals("A", result);
}
@Test
public void mustBeAbleToUseSingle() throws Exception {
//#source-single
CompletionStage<List<String>> future = Source.single("A").runWith(Sink.seq(), materializer);
CompletableFuture<List<String>> completableFuture = future.toCompletableFuture();
completableFuture.thenAccept(result -> System.out.printf("collected elements: %s\n", result));
// result list will contain exactly one element "A"
//#source-single
// DO NOT use get() directly in your production code!
List<String> result = completableFuture.get();
assertEquals(1, result.size());
assertEquals("A", result.get(0));
}
@Test
public void mustBeAbleToUsePrefixAndTail() throws Exception {
final TestKit probe = new TestKit(system);