132 lines
4.6 KiB
Java
132 lines
4.6 KiB
Java
/*
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* Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 8182672
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* @summary Java 8u121 on Linux intermittently returns null for MAC address
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*/
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import java.net.NetworkInterface;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.concurrent.Callable;
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import java.util.concurrent.ExecutorService;
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import java.util.concurrent.Executors;
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import java.util.concurrent.Future;
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import java.util.concurrent.Phaser;
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import java.util.function.Predicate;
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import java.util.stream.Collectors;
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import java.util.stream.Stream;
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public class GetMacAddress implements Callable<Exception> {
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static final int NUM_THREADS = 5;
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static final int NUM_ITERS = 100;
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static volatile boolean failed; // false
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final String threadName;
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final NetworkInterface ni;
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final Phaser startingGate;
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public GetMacAddress(NetworkInterface ni, String name, Phaser phaser) {
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this.ni = ni;
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this.threadName = name;
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this.startingGate = phaser;
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}
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@Override
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public Exception call() {
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int count = 0;
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startingGate.arriveAndAwaitAdvance();
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try {
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for (int i = 0; i < NUM_ITERS; i++) {
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ni.getMTU();
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byte[] addr = ni.getHardwareAddress();
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if (addr == null) {
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System.out.println(threadName + ". mac id is null");
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failed = true;
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}
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count = count + 1;
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if (count % 100 == 0) {
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System.out.println(threadName + ". count is " + count);
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}
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}
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} catch (Exception ex) {
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System.out.println(threadName + ". Not expecting exception:" + ex.getMessage());
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failed = true;
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return ex;
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}
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return null;
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}
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static final Predicate<NetworkInterface> hasHardwareAddress = ni -> {
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try {
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if (ni.getHardwareAddress() == null) {
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System.out.println("Not testing null addr: " + ni.getName());
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return false;
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}
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} catch (Exception ex) {
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System.out.println("Not testing: " + ni.getName() +
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" " + ex.getMessage());
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return false;
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}
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return true;
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};
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public static Stream<NetworkInterface> getNetworkInterfacesAsStream() throws Exception {
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// JDK 9 and later
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return NetworkInterface.networkInterfaces();
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// pre JDK 9
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//return Collections.list(NetworkInterface.getNetworkInterfaces()).stream();
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}
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public static void main(String[] args) throws Exception {
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List<NetworkInterface> toTest = getNetworkInterfacesAsStream()
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.filter(hasHardwareAddress)
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.collect(Collectors.toList());
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ExecutorService executor = Executors.newFixedThreadPool(NUM_THREADS);
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for (NetworkInterface ni : toTest) {
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Phaser startingGate = new Phaser(NUM_THREADS);
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System.out.println("Testing: " + ni.getName());
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List<Callable<Exception>> list = new ArrayList<>();
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for (int i = 0; i < NUM_THREADS; i++)
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list.add(new GetMacAddress(ni, ni.getName() + "-Thread-" + i, startingGate));
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List<Future<Exception>> futures = executor.invokeAll(list);
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for (Future<Exception> f : futures) {
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if (f.get() != null)
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f.get().printStackTrace(System.out);
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}
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if (failed)
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break;
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}
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executor.shutdownNow();
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if (!failed) {
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System.out.println("PASSED - Finished all threads");
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} else {
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throw new RuntimeException("Failed");
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}
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}
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}
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