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