1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.commons.math4.legacy.genetics;
18
19 import java.util.Iterator;
20 import java.util.concurrent.TimeUnit;
21
22 import org.apache.commons.math4.core.jdkmath.JdkMath;
23 import org.junit.Assert;
24 import org.junit.Test;
25
26 public class FixedElapsedTimeTest {
27
28 @Test
29 public void testIsSatisfied() {
30 final Population pop = new Population() {
31 @Override
32 public void addChromosome(final Chromosome chromosome) {
33 // unimportant
34 }
35 @Override
36 public Chromosome getFittestChromosome() {
37 // unimportant
38 return null;
39 }
40 @Override
41 public int getPopulationLimit() {
42 // unimportant
43 return 0;
44 }
45 @Override
46 public int getPopulationSize() {
47 // unimportant
48 return 0;
49 }
50 @Override
51 public Population nextGeneration() {
52 // unimportant
53 return null;
54 }
55 @Override
56 public Iterator<Chromosome> iterator() {
57 // unimportant
58 return null;
59 }
60 };
61
62 final long start = System.nanoTime();
63 final long duration = 3;
64 final FixedElapsedTime tec = new FixedElapsedTime(duration, TimeUnit.SECONDS);
65
66 while (!tec.isSatisfied(pop)) {
67 try {
68 Thread.sleep(50);
69 } catch (InterruptedException e) {
70 // ignore
71 }
72 }
73
74 final long end = System.nanoTime();
75 final long elapsedTime = end - start;
76 final long diff = JdkMath.abs(elapsedTime - TimeUnit.SECONDS.toNanos(duration));
77
78 Assert.assertTrue(diff < TimeUnit.MILLISECONDS.toNanos(100));
79 }
80 }