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 * @key randomness 28 */ 29 30 import java.nio.channels.*; 31 import java.net.*; 32 import java.util.*; 33 import java.util.concurrent.*; 34 import java.util.concurrent.atomic.*; 35 import java.io.IOException; 36 37 /** 38 * Exercise replacement of threads in the thread pool when completion handlers 39 * terminate due to errors or runtime exceptions. 40 */ 41 42 public class Restart { 43 static final Random rand = new Random(); 44 45 public static void main(String[] args) throws Exception { 46 // thread group for thread pools 47 final ThreadGroup tg = new ThreadGroup("test"); 48 49 // keep track of the number of threads that terminate 50 final AtomicInteger exceptionCount = new AtomicInteger(0); 51 final Thread.UncaughtExceptionHandler ueh = 52 new Thread.UncaughtExceptionHandler() { 53 public void uncaughtException(Thread t, Throwable e) { 54 exceptionCount.incrementAndGet(); 55 } 56 }; 57 ThreadFactory factory = new ThreadFactory() { 58 @Override 59 public Thread newThread(Runnable r) { 60 Thread t = new Thread(tg, r); 61 t.setUncaughtExceptionHandler(ueh); 62 return t; 63 } 64 }; 65 66 // group with fixed thread pool 67 int nThreads = 1 + rand.nextInt(4); 68 AsynchronousChannelGroup group = 69 AsynchronousChannelGroup.withFixedThreadPool(nThreads, factory); 70 testRestart(group, 100); 71 group.shutdown(); 72 73 // group with cached thread pool 74 ExecutorService pool = Executors.newCachedThreadPool(factory); 75 group = AsynchronousChannelGroup.withCachedThreadPool(pool, rand.nextInt(5)); 76 testRestart(group, 100); 77 group.shutdown(); 78 79 // group with custom thread pool 80 group = AsynchronousChannelGroup 81 .withThreadPool(Executors.newFixedThreadPool(1+rand.nextInt(5), factory)); 82 testRestart(group, 100); 83 group.shutdown(); 84 85 // give time for threads to terminate 86 Thread.sleep(3000); 87 int actual = exceptionCount.get(); 88 if (actual != 300) 89 throw new RuntimeException(actual + " exceptions, expected: " + 300); 90 } 91 92 static void testRestart(AsynchronousChannelGroup group, int count) 93 throws Exception 94 { 95 AsynchronousServerSocketChannel listener = 96 AsynchronousServerSocketChannel.open(group) 97 .bind(new InetSocketAddress(0)); 98 99 for (int i=0; i<count; i++) { 100 final CountDownLatch latch = new CountDownLatch(1); 101 102 listener.accept((Void)null, new CompletionHandler<AsynchronousSocketChannel,Void>() { 103 public void completed(AsynchronousSocketChannel ch, Void att) { 104 try { 105 ch.close(); 106 } catch (IOException ignore) { } 107 108 latch.countDown(); 109 110 // throw error or runtime exception 111 if (rand.nextBoolean()) { 112 throw new Error(); 113 } else { 114 throw new RuntimeException(); 115 } 116 } 117 public void failed(Throwable exc, Void att) { 118 } 119 }); 120 121 // establish loopback connection which should cause completion 122 // handler to be invoked. 123 int port = ((InetSocketAddress)(listener.getLocalAddress())).getPort(); 124 AsynchronousSocketChannel ch = AsynchronousSocketChannel.open(); 125 InetAddress lh = InetAddress.getLocalHost(); 126 ch.connect(new InetSocketAddress(lh, port)).get(); 127 ch.close(); 128 129 // wait for handler to be invoked 130 latch.await(); 131 } 132 133 // clean-up 134 listener.close(); 135 } 136 }