258 lines
8.5 KiB
Java
258 lines
8.5 KiB
Java
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/*
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* Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import org.testng.annotations.DataProvider;
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import org.testng.annotations.Test;
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import java.security.SecureRandom;
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import java.util.Arrays;
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import java.util.List;
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import java.util.ArrayList;
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import java.util.Random;
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import java.util.concurrent.Executors;
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import java.util.concurrent.ExecutorService;
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import java.util.concurrent.ThreadLocalRandom;
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import java.util.concurrent.TimeUnit;
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import java.util.stream.IntStream;
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import java.util.stream.LongStream;
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import java.util.stream.DoubleStream;
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import java.util.stream.Stream;
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import static org.testng.Assert.assertEquals;
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import static org.testng.Assert.assertFalse;
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import static org.testng.Assert.assertTrue;
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/**
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* @test
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* @run testng RandomStreamTest
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* @summary test stream methods on Random
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* @author Brian Goetz
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*/
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public class RandomStreamTest {
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private static final int SIZE = 1000;
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@DataProvider(name = "suppliers")
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public Object[][] randomSuppliers() {
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return new Object[][] {
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{new Random(), SIZE},
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{new SecureRandom(), SIZE}
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};
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}
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@Test(dataProvider = "suppliers")
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public void testRandomIntStream(final Random random, final int count) {
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final List<Integer> destination = new ArrayList<>(count);
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random.ints().limit(count).forEach(destination::add);
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assertEquals(destination.size(), count);
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}
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@Test(dataProvider = "suppliers")
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public void testRandomLongStream(final Random random, final int count) {
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final List<Long> destination = new ArrayList<>(count);
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random.longs().limit(count).forEach(destination::add);
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assertEquals(destination.size(), count);
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}
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@Test(dataProvider = "suppliers")
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public void testRandomDoubleStream(final Random random, final int count) {
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final List<Double> destination = new ArrayList<>(count);
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random.doubles().limit(count).forEach(destination::add);
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random.doubles().limit(count).forEach(d -> assertTrue(d >= 0.0 && d < 1.0));
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assertEquals(destination.size(), count);
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}
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@Test(dataProvider = "suppliers")
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public void testRandomGaussianStream(final Random random, final int count) {
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final List<Double> destination = new ArrayList<>(count);
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random.gaussians().limit(count).forEach(destination::add);
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assertEquals(destination.size(), count);
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}
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@Test
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public void testIntStream() {
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final long seed = System.currentTimeMillis();
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final Random r1 = new Random(seed);
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final int[] a = new int[SIZE];
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for (int i=0; i < SIZE; i++) {
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a[i] = r1.nextInt();
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}
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final Random r2 = new Random(seed); // same seed
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final int[] b = r2.ints().limit(SIZE).toArray();
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assertEquals(a, b);
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}
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@Test
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public void testLongStream() {
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final long seed = System.currentTimeMillis();
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final Random r1 = new Random(seed);
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final long[] a = new long[SIZE];
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for (int i=0; i < SIZE; i++) {
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a[i] = r1.nextLong();
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}
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final Random r2 = new Random(seed); // same seed
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final long[] b = r2.longs().limit(SIZE).toArray();
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assertEquals(a, b);
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}
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@Test
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public void testDoubleStream() {
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final long seed = System.currentTimeMillis();
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final Random r1 = new Random(seed);
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final double[] a = new double[SIZE];
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for (int i=0; i < SIZE; i++) {
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a[i] = r1.nextDouble();
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}
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final Random r2 = new Random(seed); // same seed
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final double[] b = r2.doubles().limit(SIZE).toArray();
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assertEquals(a, b);
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}
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@Test
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public void testGaussianStream() {
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final long seed = System.currentTimeMillis();
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final Random r1 = new Random(seed);
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final double[] a = new double[SIZE];
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for (int i=0; i < SIZE; i++) {
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a[i] = r1.nextGaussian();
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}
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final Random r2 = new Random(seed); // same seed
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final double[] b = r2.gaussians().limit(SIZE).toArray();
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assertEquals(a, b);
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}
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@Test
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public void testThreadLocalIntStream() throws InterruptedException {
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final ExecutorService e = Executors.newFixedThreadPool(10);
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final ThreadLocalRandom tlr = ThreadLocalRandom.current();
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final class RandomTask implements Runnable {
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int[] randoms;
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@Override
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public void run() {
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randoms = tlr.ints().limit(SIZE).toArray();
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}
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}
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final RandomTask[] tasks = new RandomTask[10];
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for (int i=0; i < tasks.length; i++) {
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tasks[i] = new RandomTask();
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}
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for (int i=0; i < tasks.length; i++) {
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e.submit(tasks[i]);
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}
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e.shutdown();
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e.awaitTermination(3, TimeUnit.SECONDS);
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for (int i=1; i < tasks.length; i++) {
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assertFalse(Arrays.equals(tasks[0].randoms, tasks[i].randoms));
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}
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}
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@Test
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public void testThreadLocalLongStream() throws InterruptedException {
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final ExecutorService e = Executors.newFixedThreadPool(10);
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final ThreadLocalRandom tlr = ThreadLocalRandom.current();
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final class RandomTask implements Runnable {
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long[] randoms;
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@Override
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public void run() {
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randoms = tlr.longs().limit(SIZE).toArray();
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}
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}
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final RandomTask[] tasks = new RandomTask[10];
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for (int i=0; i < tasks.length; i++) {
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tasks[i] = new RandomTask();
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}
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for (int i=0; i < tasks.length; i++) {
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e.submit(tasks[i]);
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}
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e.shutdown();
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e.awaitTermination(3, TimeUnit.SECONDS);
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for (int i=1; i < tasks.length; i++) {
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assertFalse(Arrays.equals(tasks[0].randoms, tasks[i].randoms));
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}
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}
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@Test
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public void testThreadLocalDoubleStream() throws InterruptedException {
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final ExecutorService e = Executors.newFixedThreadPool(10);
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final ThreadLocalRandom tlr = ThreadLocalRandom.current();
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final class RandomTask implements Runnable {
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double[] randoms;
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@Override
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public void run() {
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randoms = tlr.doubles().limit(SIZE).toArray();
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}
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}
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final RandomTask[] tasks = new RandomTask[10];
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for (int i=0; i < tasks.length; i++) {
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tasks[i] = new RandomTask();
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}
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for (int i=0; i < tasks.length; i++) {
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e.submit(tasks[i]);
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}
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e.shutdown();
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e.awaitTermination(3, TimeUnit.SECONDS);
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for (int i=1; i < tasks.length; i++) {
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assertFalse(Arrays.equals(tasks[0].randoms, tasks[i].randoms));
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}
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}
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@Test
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public void testThreadLocalGaussianStream() throws InterruptedException {
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final ExecutorService e = Executors.newFixedThreadPool(10);
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final ThreadLocalRandom tlr = ThreadLocalRandom.current();
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final class RandomTask implements Runnable {
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double[] randoms;
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@Override
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public void run() {
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randoms = tlr.gaussians().limit(SIZE).toArray();
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}
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}
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final RandomTask[] tasks = new RandomTask[10];
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for (int i=0; i < tasks.length; i++) {
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tasks[i] = new RandomTask();
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}
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for (int i=0; i < tasks.length; i++) {
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e.submit(tasks[i]);
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}
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e.shutdown();
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e.awaitTermination(3, TimeUnit.SECONDS);
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for (int i=1; i < tasks.length; i++) {
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assertFalse(Arrays.equals(tasks[0].randoms, tasks[i].randoms));
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}
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}
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}
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