1/* 2 * Copyright (c) 2008, 2016, 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 30import java.nio.channels.*; 31import java.net.*; 32import java.util.*; 33import java.util.concurrent.*; 34import java.util.concurrent.atomic.*; 35import 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 42public 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 try { 71 testRestart(group, 100); 72 } finally { 73 group.shutdown(); 74 } 75 76 // group with cached thread pool 77 ExecutorService pool = Executors.newCachedThreadPool(factory); 78 group = AsynchronousChannelGroup.withCachedThreadPool(pool, rand.nextInt(5)); 79 try { 80 testRestart(group, 100); 81 } finally { 82 group.shutdown(); 83 } 84 85 // group with custom thread pool 86 group = AsynchronousChannelGroup.withThreadPool( 87 Executors.newFixedThreadPool(1+rand.nextInt(5), factory)); 88 try { 89 testRestart(group, 100); 90 } finally { 91 group.shutdown(); 92 } 93 94 // give time for threads to terminate 95 Thread.sleep(3000); 96 int actual = exceptionCount.get(); 97 if (actual != 300) 98 throw new RuntimeException(actual + " exceptions, expected: " + 300); 99 } 100 101 static void testRestart(AsynchronousChannelGroup group, int count) 102 throws Exception 103 { 104 try (AsynchronousServerSocketChannel listener = 105 AsynchronousServerSocketChannel.open(group)) { 106 107 listener.bind(new InetSocketAddress(0)); 108 for (int i=0; i<count; i++) { 109 final CountDownLatch latch = new CountDownLatch(1); 110 111 listener.accept((Void)null, new CompletionHandler<AsynchronousSocketChannel,Void>() { 112 public void completed(AsynchronousSocketChannel ch, Void att) { 113 try { 114 ch.close(); 115 } catch (IOException ignore) { } 116 117 latch.countDown(); 118 119 // throw error or runtime exception 120 if (rand.nextBoolean()) { 121 throw new Error(); 122 } else { 123 throw new RuntimeException(); 124 } 125 } 126 public void failed(Throwable exc, Void att) { 127 } 128 }); 129 130 // establish loopback connection which should cause completion 131 // handler to be invoked. 132 int port = ((InetSocketAddress)(listener.getLocalAddress())).getPort(); 133 try (AsynchronousSocketChannel ch = AsynchronousSocketChannel.open()) { 134 InetAddress lh = InetAddress.getLocalHost(); 135 ch.connect(new InetSocketAddress(lh, port)).get(); 136 } 137 138 // wait for handler to be invoked 139 latch.await(); 140 } 141 } 142 } 143} 144