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Docs: flatMapConcat (#28584)

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Christopher Batey 2020-04-27 15:46:16 +01:00 • committed by GitHub
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akka-docs/src/test/java/jdocs/stream/operators/sourceorflow/FlatMapConcat.java Normal file
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/*
* Copyright (C) 2019-2020 Lightbend Inc. <https://www.lightbend.com>
*/
package jdocs.stream.operators.sourceorflow;
import akka.NotUsed;
import akka.actor.ActorSystem;
import akka.stream.javadsl.Source;
import java.util.Arrays;
public class FlatMapConcat {
private static ActorSystem system = null;
// #flatmap-concat
// e.g. could be a query to a database
private Source<String, NotUsed> lookupCustomerEvents(String customerId) {
return Source.from(Arrays.asList(customerId + "-event-1", customerId + "-event-2"));
}
// #flatmap-concat
void example() {
// #flatmap-concat
Source.from(Arrays.asList("customer-1", "customer-2"))
.flatMapConcat(this::lookupCustomerEvents)
.runForeach(System.out::println, system);
// prints - events from each customer consecutively
// customer-1-event-1
// customer-1-event-2
// customer-2-event-1
// customer-2-event-2
// #flatmap-concat
}
}