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