| /* |
| * Copyright (c) 2008, 2016, 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 |
| * @key randomness |
| */ |
| |
| 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); |
| try { |
| testRestart(group, 100); |
| } finally { |
| group.shutdown(); |
| } |
| |
| // group with cached thread pool |
| ExecutorService pool = Executors.newCachedThreadPool(factory); |
| group = AsynchronousChannelGroup.withCachedThreadPool(pool, rand.nextInt(5)); |
| try { |
| testRestart(group, 100); |
| } finally { |
| group.shutdown(); |
| } |
| |
| // group with custom thread pool |
| group = AsynchronousChannelGroup.withThreadPool( |
| Executors.newFixedThreadPool(1+rand.nextInt(5), factory)); |
| try { |
| testRestart(group, 100); |
| } finally { |
| 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 |
| { |
| try (AsynchronousServerSocketChannel listener = |
| AsynchronousServerSocketChannel.open(group)) { |
| |
| listener.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(); |
| try (AsynchronousSocketChannel ch = AsynchronousSocketChannel.open()) { |
| InetAddress lh = InetAddress.getLocalHost(); |
| ch.connect(new InetSocketAddress(lh, port)).get(); |
| } |
| |
| // wait for handler to be invoked |
| latch.await(); |
| } |
| } |
| } |
| } |