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/*
* Copyright (c) 2008, 2012, 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 4607272 6842687
* @summary Unit test for AsynchronousChannelGroup
*/
import java.nio.channels.*;
import java.net.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.concurrent.atomic.*;
import java.io.IOException;
/**
* Exercise replacement of threads in the thread pool when completion handlers
* terminate due to errors or runtime exceptions.
*/
public class Restart {
static final Random rand = new Random();
public static void main(String[] args) throws Exception {
// thread group for thread pools
final ThreadGroup tg = new ThreadGroup("test");
// keep track of the number of threads that terminate
final AtomicInteger exceptionCount = new AtomicInteger(0);
final Thread.UncaughtExceptionHandler ueh =
new Thread.UncaughtExceptionHandler() {
public void uncaughtException(Thread t, Throwable e) {
exceptionCount.incrementAndGet();
}
};
ThreadFactory factory = new ThreadFactory() {
@Override
public Thread newThread(Runnable r) {
Thread t = new Thread(tg, r);
t.setUncaughtExceptionHandler(ueh);
return t;
}
};
// group with fixed thread pool
int nThreads = 1 + rand.nextInt(4);
AsynchronousChannelGroup group =
AsynchronousChannelGroup.withFixedThreadPool(nThreads, factory);
testRestart(group, 100);
group.shutdown();
// group with cached thread pool
ExecutorService pool = Executors.newCachedThreadPool(factory);
group = AsynchronousChannelGroup.withCachedThreadPool(pool, rand.nextInt(5));
testRestart(group, 100);
group.shutdown();
// group with custom thread pool
group = AsynchronousChannelGroup
.withThreadPool(Executors.newFixedThreadPool(1+rand.nextInt(5), factory));
testRestart(group, 100);
group.shutdown();
// give time for threads to terminate
Thread.sleep(3000);
int actual = exceptionCount.get();
if (actual != 300)
throw new RuntimeException(actual + " exceptions, expected: " + 300);
}
static void testRestart(AsynchronousChannelGroup group, int count)
throws Exception
{
AsynchronousServerSocketChannel listener =
AsynchronousServerSocketChannel.open(group)
.bind(new InetSocketAddress(0));
for (int i=0; i<count; i++) {
final CountDownLatch latch = new CountDownLatch(1);
listener.accept((Void)null, new CompletionHandler<AsynchronousSocketChannel,Void>() {
public void completed(AsynchronousSocketChannel ch, Void att) {
try {
ch.close();
} catch (IOException ignore) { }
latch.countDown();
// throw error or runtime exception
if (rand.nextBoolean()) {
throw new Error();
} else {
throw new RuntimeException();
}
}
public void failed(Throwable exc, Void att) {
}
});
// establish loopback connection which should cause completion
// handler to be invoked.
int port = ((InetSocketAddress)(listener.getLocalAddress())).getPort();
AsynchronousSocketChannel ch = AsynchronousSocketChannel.open();
InetAddress lh = InetAddress.getLocalHost();
ch.connect(new InetSocketAddress(lh, port)).get();
ch.close();
// wait for handler to be invoked
latch.await();
}
// clean-up
listener.close();
}
}
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