-----Original Message-----
From: Chris Hegarty [mailto:chris.hega...@oracle.com]
Sent: Freitag, 23. Juni 2017 15:28
To: Seán Coffey <sean.cof...@oracle.com>; Langer, Christoph
<christoph.lan...@sap.com>
Cc: net-dev <net-dev@openjdk.java.net>
Subject: Re: RFR : 8182672: Java 8u121 on Linux intermittently
returns null for
MAC address
On 23/06/17 10:56, Seán Coffey wrote:
Thanks to Christoph, Vyom and Mark for the reviews.
I've improved the testcase as per feedback. Hope this meets all
requests :
http://cr.openjdk.java.net/~coffeys/webrev.8182672.jdk10.v2/webrev/
The change looks good.
Sean and I did a live coding session and arrived at the following
version of the test.
-Chris.
/*
* 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;
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 true;
};
public static void main(String[] args) throws Exception {
List<NetworkInterface> toTest =
NetworkInterface.networkInterfaces()
.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");
}
}
}
