| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.commons.math3.random; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.concurrent.Callable; |
| import java.util.concurrent.ExecutionException; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.Future; |
| |
| import org.junit.Assert; |
| import org.junit.Test; |
| |
| public class SynchronizedRandomGeneratorTest { |
| private final int numberOfThreads = 5; |
| private final int numberOfGenerators = 5; |
| private final int numberOfSamples = 100000; |
| |
| @Test |
| public void testAdapter() { |
| final int seed = 12345; |
| final RandomGenerator orig = new MersenneTwister(seed); |
| final RandomGenerator wrap |
| = new SynchronizedRandomGenerator(new MersenneTwister(seed)); |
| |
| final int bSize = 67; |
| final byte[] bOrig = new byte[bSize]; |
| final byte[] bWrap = new byte[bSize]; |
| |
| for (int i = 0; i < 100; i++) { |
| orig.nextBytes(bOrig); |
| wrap.nextBytes(bWrap); |
| for (int k = 0; k < bSize; k++) { |
| Assert.assertEquals(bOrig[k], bWrap[k]); |
| } |
| |
| Assert.assertEquals(orig.nextInt(), wrap.nextInt()); |
| |
| final int range = (i + 1) * 89; |
| Assert.assertEquals(orig.nextInt(range), wrap.nextInt(range)); |
| |
| Assert.assertEquals(orig.nextLong(), wrap.nextLong()); |
| Assert.assertEquals(orig.nextBoolean(), wrap.nextBoolean()); |
| Assert.assertEquals(orig.nextFloat(), wrap.nextFloat(), 0); |
| Assert.assertEquals(orig.nextDouble(), wrap.nextDouble(), 0); |
| Assert.assertEquals(orig.nextGaussian(), wrap.nextGaussian(), 0); |
| |
| } |
| } |
| |
| @Test |
| public void testMath899Sync() throws Throwable { |
| try { |
| // Running the test several times in order to decrease the |
| // probability that a non-thread-safe code did not trigger |
| // a concurrency problem. |
| for (int i = 0; i < 10; i++) { |
| doTestMath899(true, numberOfThreads, numberOfGenerators, numberOfSamples); |
| } |
| } catch (InterruptedException e) { |
| Assert.fail(e.getMessage()); |
| } catch (ExecutionException e) { |
| throw e.getCause(); |
| } |
| } |
| |
| /** |
| * @param sync Whether to use a synchronizing wrapper. |
| */ |
| private double[] doTestMath899(final boolean sync, |
| final int numThreads, |
| final int numGenerators, |
| final int numSamples) |
| throws InterruptedException, |
| ExecutionException { |
| final RandomGenerator rng = new MersenneTwister(); |
| final RandomGenerator wrapper = sync ? new SynchronizedRandomGenerator(rng) : rng; |
| |
| final List<Callable<Double>> tasks = new ArrayList<Callable<Double>>(); |
| for (int i = 0; i < numGenerators; i++) { |
| tasks.add(new Callable<Double>() { |
| public Double call() { |
| Double lastValue = 0d; |
| for (int j = 0; j < numSamples; j++) { |
| lastValue = wrapper.nextGaussian(); |
| } |
| return lastValue; |
| } |
| }); |
| } |
| |
| final ExecutorService exec = Executors.newFixedThreadPool(numThreads); |
| final List<Future<Double>> results = exec.invokeAll(tasks); |
| |
| final double[] values = new double[numGenerators]; |
| for (int i = 0; i < numGenerators; i++) { |
| values[i] = results.get(i).get(); |
| } |
| return values; |
| } |
| } |