DieHarder.java
/*
* Java Genetic Algorithm Library (@__identifier__@).
* Copyright (c) @__year__@ Franz Wilhelmstötter
*
* Licensed 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.
*
* Author:
* Franz Wilhelmstötter (franz.wilhelmstoetter@gmx.at)
*/
package org.jenetics.internal.util;
import static java.lang.String.format;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Objects;
import java.util.Random;
/**
* Class for testing a given random engine using the
* <a href="http://www.phy.duke.edu/~rgb/General/dieharder.php">dieharder</a>
* test application.
*
* @author <a href="mailto:franz.wilhelmstoetter@gmx.at">Franz Wilhelmstötter</a>
* @since 1.5
* @version 1.5 — <em>$Date: 2014-02-15 $</em>
*/
public final class DieHarder {
/**
* Writes random numbers to an given data output stream.
*
* @author <a href="mailto:franz.wilhelmstoetter@gmx.at">Franz Wilhelmstötter</a>
* @since 1.5
* @version 1.5 — <em>$Date: 2014-02-15 $</em>
*/
private static final class Randomizer implements Runnable {
private final Random _random;
private final OutputStream _out;
public Randomizer(final Random random, final OutputStream out) {
_random = Objects.requireNonNull(random);
_out = Objects.requireNonNull(out);
}
@Override
public void run() {
try {
final byte[] data = new byte[4096];
while (!Thread.currentThread().isInterrupted()) {
_random.nextBytes(data);
_out.write(data);
}
} catch (IOException ignore) {
}
}
}
public static void main(final String[] args) throws Exception {
if ( args.length < 1) {
println("Usage: java org.jenetics.internal.util.DieHarder <random-class-name>");
return;
}
final String randomName = args[0];
Random random = null;
try {
random = (Random)Class.forName(randomName).newInstance();
printt(
"Testing: %s (%s)",
randomName,
new SimpleDateFormat("yyyy-MM-dd HH:mm").format(new Date())
);
} catch (Exception e) {
System.out.println("Can't create random class " + randomName);
return;
}
final List<String> dieharderArgs = new ArrayList<>();
dieharderArgs.add("dieharder");
for (int i = 1; i < args.length; ++i) {
dieharderArgs.add(args[i]);
}
dieharderArgs.add("-g");
dieharderArgs.add("200");
printv();
final long start = System.currentTimeMillis();
final ProcessBuilder builder = new ProcessBuilder(dieharderArgs);
final Process dieharder = builder.start();
final Thread randomizer = new Thread(new Randomizer(
random,
dieharder.getOutputStream()
));
randomizer.start();
final BufferedReader stdout = new BufferedReader (
new InputStreamReader(dieharder.getInputStream())
);
String line = null;
while ((line = stdout.readLine()) != null) {
System.out.println(line);
}
dieharder.waitFor();
randomizer.interrupt();
final long sec = (System.currentTimeMillis() - start)/1000;
printt("Runtime: %d:%02d:%02d", sec/3600, (sec%3600)/60, (sec%60));
}
private static void printt(final String title, final Object... args) {
println("#=============================================================================#");
println("# %-76s#", format(title, args));
println("#=============================================================================#");
}
private static void printv() {
println("#=============================================================================#");
println(
"# %-76s#",
format("%s %s (%s) ", p("os.name"), p("os.version"), p("os.arch"))
);
println(
"# %-76s#",
format("java version \"%s\"", p("java.version"))
);
println(
"# %-76s#",
format("%s (build %s)", p("java.runtime.name"), p("java.runtime.version"))
);
println(
"# %-76s#",
format("%s (build %s)", p("java.vm.name"), p("java.vm.version"))
);
println("#=============================================================================#");
}
private static String p(final String name) {
return System.getProperty(name);
}
private static void println(final String pattern, final Object... args) {
System.out.println(format(pattern, args));
}
}