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Refresh parallel-collectors examples

This commit is contained in:
Grzegorz Piwowarek 2024-01-25 08:21:49 +01:00
parent cb34210a52
commit dd76af7c58
2 changed files with 60 additions and 51 deletions
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4
libraries-stream/pom.xml
View File

@ -49,11 +49,11 @@
<properties>
<jool.version>0.9.12</jool.version>
<parallel-collectors.version>1.1.0</parallel-collectors.version>
<parallel-collectors.version>2.5.0</parallel-collectors.version>
<vavr.version>0.9.0</vavr.version>
<eclipse-collections.version>8.2.0</eclipse-collections.version>
<streamex.version>0.8.1</streamex.version>
<protonpack.version>1.15</protonpack.version>
</properties>
</project>
</project>

107
libraries-stream/src/test/java/com/baeldung/parallel_collectors/ParallelCollectorsUnitTest.java
View File

@ -1,5 +1,6 @@
package com.baeldung.parallel_collectors;
import com.pivovarit.collectors.ParallelCollectors;
import org.junit.Test;
import java.util.Arrays;
@ -12,13 +13,15 @@ import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadLocalRandom;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import static com.pivovarit.collectors.ParallelCollectors.parallel;
import static com.pivovarit.collectors.ParallelCollectors.parallelOrdered;
import static com.pivovarit.collectors.ParallelCollectors.parallelToCollection;
import static com.pivovarit.collectors.ParallelCollectors.parallelToList;
import static com.pivovarit.collectors.ParallelCollectors.parallelToMap;
import static com.pivovarit.collectors.ParallelCollectors.parallelToOrderedStream;
import static com.pivovarit.collectors.ParallelCollectors.parallelToStream;
import static java.util.concurrent.CompletableFuture.completedFuture;
import static java.util.stream.Collectors.toCollection;
import static java.util.stream.Collectors.toList;
import static org.assertj.core.api.Assertions.assertThat;
public class ParallelCollectorsUnitTest {
@ -28,9 +31,9 @@ public class ParallelCollectorsUnitTest {
List<String> results = ids.parallelStream()
.map(i -> fetchById(i))
.collect(Collectors.toList());
.collect(toList());
System.out.println(results);
assertThat(results).containsExactly("user-1", "user-2", "user-3");
}
@Test
@ -39,10 +42,11 @@ public class ParallelCollectorsUnitTest {
List<Integer> ids = Arrays.asList(1, 2, 3);
CompletableFuture<List<String>> results = ids.stream()
.collect(parallelToList(ParallelCollectorsUnitTest::fetchById, executor, 4));
CompletableFuture<String> results = ids.stream()
.collect(parallel(ParallelCollectorsUnitTest::fetchById, executor, 4))
.thenApply(s -> s.reduce("", (s1, s2) -> s1 + s2));
System.out.println(results.join());
assertThat(results.join()).contains("user-1user-2user-3");
}
@Test
@ -51,11 +55,10 @@ public class ParallelCollectorsUnitTest {
List<Integer> ids = Arrays.asList(1, 2, 3);
List<String> results = ids.stream()
.collect(parallelToList(ParallelCollectorsUnitTest::fetchById, executor, 4))
.join();
CompletableFuture<List<String>> results = ids.stream()
.collect(parallel(ParallelCollectorsUnitTest::fetchById, toList(), executor, 4));
System.out.println(results); // [user-1, user-2, user-3]
assertThat(results.join()).containsExactly("user-1", "user-2", "user-3");
}
@Test
@ -64,11 +67,11 @@ public class ParallelCollectorsUnitTest {
List<Integer> ids = Arrays.asList(1, 2, 3);
List<String> results = ids.stream()
.collect(parallelToCollection(i -> fetchById(i), LinkedList::new, executor, 4))
.join();
CompletableFuture<List<String>> results = ids.stream()
.collect(parallel(i -> fetchById(i), toCollection(LinkedList::new), executor, 4));
System.out.println(results); // [user-1, user-2, user-3]
assertThat(results.join())
.containsExactly("user-1", "user-2", "user-3");
}
@Test
@ -77,12 +80,13 @@ public class ParallelCollectorsUnitTest {
List<Integer> ids = Arrays.asList(1, 2, 3);
Map<Integer, List<String>> results = ids.stream()
.collect(parallelToStream(i -> fetchById(i), executor, 4))
.thenApply(stream -> stream.collect(Collectors.groupingBy(i -> i.length())))
.join();
CompletableFuture<Map<Integer, List<String>>> results = ids.stream()
.collect(parallel(i -> fetchById(i), executor, 4))
.thenApply(stream -> stream.collect(Collectors.groupingBy(String::length)));
System.out.println(results); // [user-1, user-2, user-3]
assertThat(results.join())
.hasSize(1)
.containsEntry(6, Arrays.asList("user-1", "user-2", "user-3"));
}
@Test
@ -91,9 +95,10 @@ public class ParallelCollectorsUnitTest {
List<Integer> ids = Arrays.asList(1, 2, 3);
ids.stream()
.collect(parallel(ParallelCollectorsUnitTest::fetchByIdWithRandomDelay, executor, 4))
.forEach(System.out::println);
Stream<String> result = ids.stream()
.collect(parallelToStream(ParallelCollectorsUnitTest::fetchByIdWithRandomDelay, executor, 4));
assertThat(result).contains("user-1", "user-2", "user-3");
}
@Test
@ -102,9 +107,10 @@ public class ParallelCollectorsUnitTest {
List<Integer> ids = Arrays.asList(1, 2, 3);
ids.stream()
.collect(parallelOrdered(ParallelCollectorsUnitTest::fetchByIdWithRandomDelay, executor, 4))
.forEach(System.out::println);
Stream<String> result = ids.stream()
.collect(parallelToOrderedStream(ParallelCollectorsUnitTest::fetchByIdWithRandomDelay, executor, 4));
assertThat(result).containsExactly("user-1", "user-2", "user-3");
}
@Test
@ -113,24 +119,14 @@ public class ParallelCollectorsUnitTest {
List<Integer> ids = Arrays.asList(1, 2, 3);
Map<Integer, String> results = ids.stream()
.collect(parallelToMap(i -> i, ParallelCollectorsUnitTest::fetchById, executor, 4))
.join();
CompletableFuture<Map<Integer, String>> results = ids.stream()
.collect(parallel(i -> i, Collectors.toMap(i -> i, ParallelCollectorsUnitTest::fetchById), executor, 4));
System.out.println(results); // {1=user-1, 2=user-2, 3=user-3}
}
@Test
public void shouldCollectToTreeMap() {
ExecutorService executor = Executors.newFixedThreadPool(10);
List<Integer> ids = Arrays.asList(1, 2, 3);
Map<Integer, String> results = ids.stream()
.collect(parallelToMap(i -> i, ParallelCollectorsUnitTest::fetchById, TreeMap::new, executor, 4))
.join();
System.out.println(results); // {1=user-1, 2=user-2, 3=user-3}
assertThat(results.join())
.hasSize(3)
.containsEntry(1, "user-1")
.containsEntry(2, "user-2")
.containsEntry(3, "user-3");
}
@Test
@ -139,11 +135,24 @@ public class ParallelCollectorsUnitTest {
List<Integer> ids = Arrays.asList(1, 2, 3);
Map<Integer, String> results = ids.stream()
.collect(parallelToMap(i -> i, ParallelCollectorsUnitTest::fetchById, TreeMap::new, (s1, s2) -> s1, executor, 4))
.join();
CompletableFuture<Map<Integer, String>> results = ids.stream()
.collect(parallel(i -> i, Collectors.toMap(i -> i, ParallelCollectorsUnitTest::fetchById, (u1, u2) -> u1, TreeMap::new), executor, 4));
System.out.println(results); // {1=user-1, 2=user-2, 3=user-3}
assertThat(results.join())
.hasSize(3)
.containsEntry(1, "user-1")
.containsEntry(2, "user-2")
.containsEntry(3, "user-3");
}
@Test
public void shouldCollectListOfFutures() {
List<CompletableFuture<Integer>> futures = Arrays.asList(completedFuture(1), completedFuture(2), completedFuture(3));
CompletableFuture<List<Integer>> result = futures.stream()
.collect(ParallelCollectors.toFuture());
assertThat(result.join()).containsExactly(1, 2, 3);
}
private static String fetchById(int id) {