BAEL:2033 - Stream-ordering files moved to the Java-Streams module (#5097)
* Added stream-ordering files * Removed old files * Rename core-java-8/src/test/java/com/baeldung/streamordering/BenchmarkUnitTest.java to java-streams/src/test/java/com/baeldung/streamordering/BenchmarkUnitTest.java * Rename core-java-8/src/test/java/com/baeldung/streamordering/StreamsOrderingUnitTest.java to java-streams/src/test/com/baeldung/streamordering/StreamsOrderingUnitTest.java * Rename java-streams/src/test/com/baeldung/streamordering/StreamsOrderingUnitTest.java to java-streams/src/test/java/com/baeldung/streamordering/StreamsOrderingUnitTest.java * Updated Pom with JMH dependencies
This commit is contained in:
Sam Millington
Josh Cummings
parent
991335da42
commit
8a65afeb5d
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@ -15,6 +15,18 @@
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</parent>
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<dependencies>
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<!-- https://mvnrepository.com/artifact/org.openjdk.jmh/jmh-core -->
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<dependency>
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<groupId>org.openjdk.jmh</groupId>
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<artifactId>jmh-core</artifactId>
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<version>${jmh.version}</version>
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</dependency>
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<dependency>
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<groupId>org.openjdk.jmh</groupId>
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<artifactId>jmh-generator-annprocess</artifactId>
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<version>${jmh.version}</version>
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<scope>provided</scope>
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</dependency>
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<dependency>
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<groupId>org.apache.commons</groupId>
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<artifactId>commons-lang3</artifactId>
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@ -107,6 +119,7 @@
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<properties>
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<!-- util -->
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<jmh.version>1.21</jmh.version>
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<commons-lang3.version>3.5</commons-lang3.version>
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<lombok.version>1.16.12</lombok.version>
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<vavr.version>0.9.0</vavr.version>
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@ -0,0 +1,97 @@
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package com.baeldung.streamordering;
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import org.junit.Test;
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import org.openjdk.jmh.annotations.*;
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import org.openjdk.jmh.infra.Blackhole;
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import org.openjdk.jmh.runner.Runner;
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import org.openjdk.jmh.runner.options.Options;
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import org.openjdk.jmh.runner.options.OptionsBuilder;
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import org.openjdk.jmh.runner.options.TimeValue;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Random;
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import java.util.concurrent.TimeUnit;
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import java.util.stream.IntStream;
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public class BenchmarkUnitTest
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{
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@Test
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public void
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launchBenchmark() throws Exception {
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Options opt = new OptionsBuilder()
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// Specify which benchmarks to run.
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// You can be more specific if you'd like to run only one benchmark per test.
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.include(this.getClass().getName() + ".*")
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// Set the following options as needed
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.mode (Mode.AverageTime)
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.timeUnit(TimeUnit.MICROSECONDS)
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.warmupTime(TimeValue.seconds(1))
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.warmupIterations(2)
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.measurementTime(TimeValue.seconds(1))
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.measurementIterations(2)
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.threads(2)
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.forks(1)
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.shouldFailOnError(true)
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.shouldDoGC(true)
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//.jvmArgs("-XX:+UnlockDiagnosticVMOptions", "-XX:+PrintInlining")
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//.addProfiler(WinPerfAsmProfiler.class)
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.build();
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new Runner(opt).run();
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}
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@Benchmark
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public void givenOrderedStreamInput_whenStreamFiltered_showOpsPerMS(){
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IntStream.range(1, 100_000_000).parallel().filter(i -> i % 10 == 0).toArray();
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}
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@Benchmark
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public void givenUnorderedStreamInput_whenStreamFiltered_showOpsPerMS(){
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IntStream.range(1,100_000_000).unordered().parallel().filter(i -> i % 10 == 0).toArray();
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}
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@Benchmark
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public void givenUnorderedStreamInput_whenStreamDistinct_showOpsPerMS(){
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IntStream.range(1, 1_000_000).unordered().parallel().distinct().toArray();
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}
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@Benchmark
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public void givenOrderedStreamInput_whenStreamDistinct_showOpsPerMS() {
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//section 5.1.
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IntStream.range(1, 1_000_000).parallel().distinct().toArray();
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}
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// The JMH samples are the best documentation for how to use it
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// http://hg.openjdk.java.net/code-tools/jmh/file/tip/jmh-samples/src/main/java/org/openjdk/jmh/samples/
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@State(Scope.Thread)
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public static class BenchmarkState
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{
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List<Integer> list;
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@Setup(Level.Trial) public void
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initialize() {
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Random rand = new Random();
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list = new ArrayList<>();
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for (int i = 0; i < 1000; i++)
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list.add (rand.nextInt());
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}
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}
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@Benchmark public void
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benchmark1 (BenchmarkState state, Blackhole bh) {
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List<Integer> list = state.list;
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for (int i = 0; i < 1000; i++)
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bh.consume (list.get (i));
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}
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}
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@ -0,0 +1,149 @@
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package com.baeldung.streamordering;
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import org.junit.Before;
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import org.junit.Test;
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import java.util.*;
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import java.util.function.Function;
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import java.util.logging.Level;
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import java.util.logging.Logger;
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import java.util.stream.Collectors;
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import java.util.stream.IntStream;
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import static org.junit.Assert.assertEquals;
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public class StreamsOrderingUnitTest {
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Logger logger = Logger.getLogger( StreamsOrderingUnitTest.class.getName());
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@Before
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public void setUp() throws Exception {
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logger.setLevel(Level.ALL);
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}
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@Test
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public void givenTwoCollections_whenStreamed_thenCheckOutputDifferent(){
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List<String> list = Arrays.asList("B", "A", "C", "D", "F");
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Set<String> set = new TreeSet<>(Arrays.asList("B", "A", "C", "D", "F"));
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Object[] listOutput = list.stream().toArray();
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Object[] setOutput = set.stream().toArray();
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assertEquals("[B, A, C, D, F]", Arrays.toString(listOutput));
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assertEquals("[A, B, C, D, F]", Arrays.toString(setOutput));
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}
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@Test
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public void givenTwoCollections_whenStreamedInParallel_thenCheckOutputDifferent(){
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List<String> list = Arrays.asList("B", "A", "C", "D", "F");
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Set<String> set = new TreeSet<>(Arrays.asList("B", "A", "C", "D", "F"));
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Object[] listOutput = list.stream().parallel().toArray();
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Object[] setOutput = set.stream().parallel().toArray();
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assertEquals("[B, A, C, D, F]", Arrays.toString(listOutput));
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assertEquals("[A, B, C, D, F]", Arrays.toString(setOutput));
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}
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@Test
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public void givenOrderedInput_whenUnorderedAndOrderedCompared_thenCheckUnorderedOutputChanges(){
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Set<Integer> set = new TreeSet<>(
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Arrays.asList(-9, -5, -4, -2, 1, 2, 4, 5, 7, 9, 12, 13, 16, 29, 23, 34, 57, 68, 90, 102, 230));
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Object[] orderedArray = set.stream()
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.parallel()
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.limit(5)
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.toArray();
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Object[] unorderedArray = set.stream()
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.unordered()
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.parallel()
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.limit(5)
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.toArray();
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logger.info(Arrays.toString(orderedArray));
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logger.info(Arrays.toString(unorderedArray));
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}
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@Test
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public void givenUnsortedStreamInput_whenStreamSorted_thenCheckOrderChanged(){
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List<Integer> list = Arrays.asList(-3,10,-4,1,3);
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Object[] listOutput = list.stream().toArray();
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Object[] listOutputSorted = list.stream().sorted().toArray();
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assertEquals("[-3, 10, -4, 1, 3]", Arrays.toString(listOutput));
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assertEquals("[-4, -3, 1, 3, 10]", Arrays.toString(listOutputSorted));
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}
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@Test
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public void givenUnsortedStreamInput_whenStreamDistinct_thenShowTimeTaken(){
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long start, end;
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start = System.currentTimeMillis();
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IntStream.range(1,1_000_000).unordered().parallel().distinct().toArray();
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end = System.currentTimeMillis();
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System.out.println(String.format("Time taken when unordered: %d ms", (end - start)));
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}
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@Test
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public void givenSameCollection_whenStreamTerminated_thenCheckEachVsEachOrdered(){
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List<String> list = Arrays.asList("B", "A", "C", "D", "F");
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list.stream().parallel().forEach(e -> logger.log(Level.INFO, e));
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list.stream().parallel().forEachOrdered(e -> logger.log(Level.INFO, e));
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}
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@Test
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public void givenSameCollection_whenStreamCollected_thenCheckOutput(){
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List<String> list = Arrays.asList("B", "A", "C", "D", "F");
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List<String> collectionList = list.stream().parallel().collect(Collectors.toList());
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Set<String> collectionSet = list.stream().parallel().collect(Collectors.toCollection(TreeSet::new));
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assertEquals("[B, A, C, D, F]", collectionList.toString());
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assertEquals("[A, B, C, D, F]", collectionSet.toString());
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}
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@Test
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public void givenListIterationOrder_whenStreamCollectedToMap_thenCeckOrderChanged() {
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List<String> list = Arrays.asList("A", "BB", "CCC");
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Map<String, Integer> hashMap = list.stream().collect(Collectors.toMap(Function.identity(), String::length));
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Object[] keySet = hashMap.keySet().toArray();
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assertEquals("[BB, A, CCC]", Arrays.toString(keySet));
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}
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@Test
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public void givenListIteration_whenStreamCollectedtoHashMap_thenCheckOrderMaintained() {
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List<String> list = Arrays.asList("A", "BB", "CCC", "CCC");
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Map<String, Integer> linkedHashMap = list.stream().collect(Collectors.toMap(
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Function.identity(),
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String::length,
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(u, v) -> u,
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LinkedHashMap::new
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));
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Object[] keySet = linkedHashMap.keySet().toArray();
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assertEquals("[A, BB, CCC]", Arrays.toString(keySet));
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}
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}
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