82 lines
2 KiB
Java
82 lines
2 KiB
Java
/**
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* Copyright (C) 2018 Lightbend Inc. <https://www.lightbend.com>
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*/
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package jdocs.stream.operators;
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import akka.stream.Materializer;
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import akka.stream.javadsl.Flow;
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//#zip-with-index
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import akka.stream.javadsl.Sink;
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import akka.stream.javadsl.Source;
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import java.util.Arrays;
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//#zip-with-index
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//#log
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import akka.stream.Attributes;
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import akka.stream.javadsl.Source;
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//#log
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import java.time.Duration;
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import java.util.Arrays;
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class SourceOrFlow {
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void logExample() {
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Flow.of(String.class)
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//#log
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.log("myStream")
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.addAttributes(Attributes.createLogLevels(
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Attributes.logLevelOff(), // onElement
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Attributes.logLevelError(), // onFailure
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Attributes.logLevelInfo())) // onFinish
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//#log
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;
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}
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void zipWithIndexExample() {
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Materializer materializer = null;
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//#zip-with-index
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Source.from(Arrays.asList("apple", "orange", "banana"))
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.zipWithIndex()
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.runWith(Sink.foreach(System.out::print), materializer);
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// this will print ('apple', 0), ('orange', 1), ('banana', 2)
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//#zip-with-index
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}
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void conflateExample() {
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//#conflate
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Source.cycle(() -> Arrays.asList(1, 10, 100).iterator())
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.throttle(10, Duration.ofSeconds(1)) // fast upstream
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.conflate((Integer acc, Integer el) -> acc + el)
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.throttle(1, Duration.ofSeconds(1)); // slow downstream
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//#conflate
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}
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static //#conflateWithSeed-type
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class Summed {
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private final Integer el;
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public Summed(Integer el) {
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this.el = el;
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}
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public Summed sum(Summed other) {
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return new Summed(this.el + other.el);
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}
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}
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//#conflateWithSeed-type
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void conflateWithSeedExample() {
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//#conflateWithSeed
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Source.cycle(() -> Arrays.asList(1, 10, 100).iterator())
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.throttle(10, Duration.ofSeconds(1)) // fast upstream
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.conflateWithSeed(Summed::new, (Summed acc, Integer el) -> acc.sum(new Summed(el)))
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.throttle(1, Duration.ofSeconds(1)); // slow downstream
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//#conflateWithSeed
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}
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}
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