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Java example source code file (FixedElapsedTimeTest.java)

This example Java source code file (FixedElapsedTimeTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

chromosome, fixedelapsedtime, fixedelapsedtimetest, interruptedexception, iterator, population, test, threading, threads, util

The FixedElapsedTimeTest.java Java example source code

 * 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,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package org.apache.commons.math3.genetics;

import java.util.Iterator;
import java.util.concurrent.TimeUnit;

import org.apache.commons.math3.util.FastMath;
import org.junit.Assert;
import org.junit.Test;

public class FixedElapsedTimeTest {

    public void testIsSatisfied() {
        final Population pop = new Population() {
            public void addChromosome(final Chromosome chromosome) {
                // unimportant
            public Chromosome getFittestChromosome() {
                // unimportant
                return null;
            public int getPopulationLimit() {
                // unimportant
                return 0;
            public int getPopulationSize() {
                // unimportant
                return 0;
            public Population nextGeneration() {
                // unimportant
                return null;
            public Iterator<Chromosome> iterator() {
                // unimportant
                return null;

        final long start = System.nanoTime();
        final long duration = 3;
        final FixedElapsedTime tec = new FixedElapsedTime(duration, TimeUnit.SECONDS);

        while (!tec.isSatisfied(pop)) {
            try {
            } catch (InterruptedException e) {
                // ignore

        final long end = System.nanoTime();
        final long elapsedTime = end - start;
        final long diff = FastMath.abs(elapsedTime - TimeUnit.SECONDS.toNanos(duration));

        Assert.assertTrue(diff < TimeUnit.MILLISECONDS.toNanos(100));

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