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Add examples for Fan-in operators #25468

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Saleh Khazaei 2018-10-25 17:07:48 +03:30 • committed by Johan Andrén
parent b8a9f8b6d7
commit 91b0c387be
16 changed files with 316 additions and 1 deletions
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119
akka-docs/src/test/java/jdocs/stream/operators/SourceOrFlow.java
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@ -7,12 +7,32 @@ package jdocs.stream.operators;
import akka.stream.Materializer;
import akka.stream.javadsl.Flow;
import akka.NotUsed;
import akka.japi.function.Function2;
//#zip
//#zip-with
//#zip-with-index
import akka.stream.javadsl.Sink;
//#or-else
//#prepend
//#concat
//#interleave
//#merge
//#merge-sorted
import akka.stream.javadsl.Source;
import akka.stream.javadsl.Sink;
import java.util.Arrays;
//#merge-sorted
//#merge
//#interleave
//#concat
//#prepend
//#or-else
//#zip-with-index
//#zip-with
//#zip
//#log
import akka.stream.Attributes;
import akka.stream.javadsl.Source;
@ -20,9 +40,11 @@ import akka.stream.javadsl.Source;
import java.time.Duration;
import java.util.Arrays;
import java.util.Comparator;
class SourceOrFlow {
private static Materializer materializer = null;
void logExample() {
Flow.of(String.class)
@ -46,6 +68,101 @@ class SourceOrFlow {
//#zip-with-index
}
void zipExample() {
//#zip
Source<String, NotUsed> sourceFruits = Source.from(Arrays.asList("apple", "orange", "banana"));
Source<String, NotUsed> sourceFirstLetters = Source.from(Arrays.asList("A", "O", "B"));
sourceFruits.zip(sourceFirstLetters).runWith(Sink.foreach(System.out::print), materializer);
// this will print ('apple', 'A'), ('orange', 'O'), ('banana', 'B')
//#zip
}
void zipWithExample() {
//#zip-with
Source<String, NotUsed> sourceCount = Source.from(Arrays.asList("one", "two", "three"));
Source<String, NotUsed> sourceFruits = Source.from(Arrays.asList("apple", "orange", "banana"));
sourceCount.zipWith(
sourceFruits,
(Function2<String, String, String>) (countStr, fruitName) -> countStr + " " + fruitName
).runWith(Sink.foreach(System.out::print), materializer);
// this will print 'one apple', 'two orange', 'three banana'
//#zip-with
}
void prependExample() {
//#prepend
Source<String, NotUsed> ladies = Source.from(Arrays.asList("Emma", "Emily"));
Source<String, NotUsed> gentlemen = Source.from(Arrays.asList("Liam", "William"));
gentlemen.prepend(ladies).runWith(Sink.foreach(System.out::print), materializer);
// this will print "Emma", "Emily", "Liam", "William"
//#prepend
}
void concatExample() {
//#concat
Source<Integer, NotUsed> sourceA = Source.from(Arrays.asList(1, 2, 3, 4));
Source<Integer, NotUsed> sourceB = Source.from(Arrays.asList(10, 20, 30, 40));
sourceA.concat(sourceB).runWith(Sink.foreach(System.out::print), materializer);
//prints 1, 2, 3, 4, 10, 20, 30, 40
//#concat
}
void interleaveExample() {
//#interleave
Source<Integer, NotUsed> sourceA = Source.from(Arrays.asList(1, 2, 3, 4));
Source<Integer, NotUsed> sourceB = Source.from(Arrays.asList(10, 20, 30, 40));
sourceA.interleave(sourceB, 2).runWith(Sink.foreach(System.out::print), materializer);
//prints 1, 2, 10, 20, 3, 4, 30, 40
//#interleave
}
void mergeExample() {
//#merge
Source<Integer, NotUsed> sourceA = Source.from(Arrays.asList(1, 2, 3, 4));
Source<Integer, NotUsed> sourceB = Source.from(Arrays.asList(10, 20, 30, 40));
sourceA.merge(sourceB).runWith(Sink.foreach(System.out::print), materializer);
// merging is not deterministic, can for example print 1, 2, 3, 4, 10, 20, 30, 40
//#merge
}
void mergeSortedExample() {
//#merge-sorted
Source<Integer, NotUsed> sourceA = Source.from(Arrays.asList(1, 3, 5, 7));
Source<Integer, NotUsed> sourceB = Source.from(Arrays.asList(2, 4, 6, 8));
sourceA.mergeSorted(sourceB, Comparator.<Integer>naturalOrder()).runWith(Sink.foreach(System.out::print), materializer);
//prints 1, 2, 3, 4, 5, 6, 7, 8
Source<Integer, NotUsed> sourceC = Source.from(Arrays.asList(20, 1, 1, 1));
sourceA.mergeSorted(sourceC, Comparator.<Integer>naturalOrder()).runWith(Sink.foreach(System.out::print), materializer);
//prints 1, 3, 5, 7, 20, 1, 1, 1
//#merge-sorted
}
void orElseExample() {
//#or-else
Source<String, NotUsed> source1 = Source.from(Arrays.asList("First source"));
Source<String, NotUsed> source2 = Source.from(Arrays.asList("Second source"));
Source<String, NotUsed> emptySource = Source.empty();
source1.orElse(source2).runWith(Sink.foreach(System.out::print), materializer);
// this will print "First source"
emptySource.orElse(source2).runWith(Sink.foreach(System.out::print), materializer);
// this will print "Second source"
//#or-else
}
void conflateExample() {
//#conflate
Source.cycle(() -> Arrays.asList(1, 10, 100).iterator())