1 /* 2 * Copyright (c) 2008, 2012, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /* @test 25 * @bug 4607272 6842687 26 * @summary Unit test for AsynchronousChannelGroup 27 */ 28 29 import java.nio.channels.*; 30 import java.net.*; 31 import java.util.*; 32 import java.util.concurrent.*; 33 import java.util.concurrent.atomic.*; 34 import java.io.IOException; 35 36 /** 37 * Exercise replacement of threads in the thread pool when completion handlers 38 * terminate due to errors or runtime exceptions. 39 */ 40 41 public class Restart { 42 static final Random rand = new Random(); 43 44 public static void main(String[] args) throws Exception { 45 // thread group for thread pools 46 final ThreadGroup tg = new ThreadGroup("test"); 47 48 // keep track of the number of threads that terminate 49 final AtomicInteger exceptionCount = new AtomicInteger(0); 50 final Thread.UncaughtExceptionHandler ueh = 51 new Thread.UncaughtExceptionHandler() { 52 public void uncaughtException(Thread t, Throwable e) { 53 exceptionCount.incrementAndGet(); 54 } 55 }; 56 ThreadFactory factory = new ThreadFactory() { 57 @Override 58 public Thread newThread(Runnable r) { 59 Thread t = new Thread(tg, r); 60 t.setUncaughtExceptionHandler(ueh); 61 return t; 62 } 63 }; 64 65 // group with fixed thread pool 66 int nThreads = 1 + rand.nextInt(4); 67 AsynchronousChannelGroup group = 68 AsynchronousChannelGroup.withFixedThreadPool(nThreads, factory); 69 testRestart(group, 100); 70 group.shutdown(); 71 72 // group with cached thread pool 73 ExecutorService pool = Executors.newCachedThreadPool(factory); 74 group = AsynchronousChannelGroup.withCachedThreadPool(pool, rand.nextInt(5)); 75 testRestart(group, 100); 76 group.shutdown(); 77 78 // group with custom thread pool 79 group = AsynchronousChannelGroup 80 .withThreadPool(Executors.newFixedThreadPool(1+rand.nextInt(5), factory)); 81 testRestart(group, 100); 82 group.shutdown(); 83 84 // give time for threads to terminate 85 Thread.sleep(3000); 86 int actual = exceptionCount.get(); 87 if (actual != 300) 88 throw new RuntimeException(actual + " exceptions, expected: " + 300); 89 } 90 91 static void testRestart(AsynchronousChannelGroup group, int count) 92 throws Exception 93 { 94 AsynchronousServerSocketChannel listener = 95 AsynchronousServerSocketChannel.open(group) 96 .bind(new InetSocketAddress(0)); 97 98 for (int i=0; i<count; i++) { 99 final CountDownLatch latch = new CountDownLatch(1); 100 101 listener.accept((Void)null, new CompletionHandler<AsynchronousSocketChannel,Void>() { 102 public void completed(AsynchronousSocketChannel ch, Void att) { 103 try { 104 ch.close(); 105 } catch (IOException ignore) { } 106 107 latch.countDown(); 108 109 // throw error or runtime exception 110 if (rand.nextBoolean()) { 111 throw new Error(); 112 } else { 113 throw new RuntimeException(); 114 } 115 } 116 public void failed(Throwable exc, Void att) { 117 } 118 }); 119 120 // establish loopback connection which should cause completion 121 // handler to be invoked. 122 int port = ((InetSocketAddress)(listener.getLocalAddress())).getPort(); 123 AsynchronousSocketChannel ch = AsynchronousSocketChannel.open(); 124 InetAddress lh = InetAddress.getLocalHost(); 125 ch.connect(new InetSocketAddress(lh, port)).get(); 126 ch.close(); 127 128 // wait for handler to be invoked 129 latch.await(); 130 } 131 132 // clean-up 133 listener.close(); 134 } 135 }