Restart.java revision 893:f06f30b29f36 
1/*
2 * Copyright 2008-2009 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 */
23
24/* @test
25 * @bug 4607272
26 * @summary Unit test for AsynchronousChannelGroup
27 * @build Restart
28 * @run main/othervm -XX:-UseVMInterruptibleIO Restart
29 */
30
31import java.nio.channels.*;
32import java.net.*;
33import java.util.*;
34import java.util.concurrent.*;
35import java.util.concurrent.atomic.*;
36import java.io.IOException;
37
38/**
39 * Exercise replacement of threads in the thread pool when completion handlers
40 * terminate due to errors or runtime exceptions.
41 */
42
43public class Restart {
44    static final Random rand = new Random();
45
46    public static void main(String[] args) throws Exception {
47        // thread group for thread pools
48        final ThreadGroup tg = new ThreadGroup("test");
49
50        // keep track of the number of threads that terminate
51        final AtomicInteger exceptionCount = new AtomicInteger(0);
52        final Thread.UncaughtExceptionHandler ueh =
53            new Thread.UncaughtExceptionHandler() {
54                public void uncaughtException(Thread t, Throwable e) {
55                    exceptionCount.incrementAndGet();
56                }
57            };
58        ThreadFactory factory = new ThreadFactory() {
59            @Override
60            public Thread newThread(Runnable r) {
61                Thread t = new Thread(tg, r);
62                t.setUncaughtExceptionHandler(ueh);
63                return t;
64            }
65        };
66
67        // group with fixed thread pool
68        int nThreads = 1 + rand.nextInt(4);
69        AsynchronousChannelGroup group =
70            AsynchronousChannelGroup.withFixedThreadPool(nThreads, factory);
71        testRestart(group, 100);
72        group.shutdown();
73
74        // group with custom thread pool
75        ExecutorService pool = Executors.newCachedThreadPool(factory);
76        group = AsynchronousChannelGroup.withCachedThreadPool(pool, rand.nextInt(5));
77        testRestart(group, 100);
78        group.shutdown();
79
80        // give time for threads to terminate
81        Thread.sleep(3000);
82        int actual = exceptionCount.get();
83        if (actual != 200)
84            throw new RuntimeException(actual + " exceptions, expected: " + 200);
85    }
86
87    static void testRestart(AsynchronousChannelGroup group, int count)
88        throws Exception
89    {
90        AsynchronousServerSocketChannel listener =
91            AsynchronousServerSocketChannel.open(group)
92                .bind(new InetSocketAddress(0));
93
94        for (int i=0; i<count; i++) {
95            final CountDownLatch latch = new CountDownLatch(1);
96
97            listener.accept(null, new CompletionHandler<AsynchronousSocketChannel,Void>() {
98                public void completed(AsynchronousSocketChannel ch, Void att) {
99                    try {
100                        ch.close();
101                    } catch (IOException ignore) { }
102
103                    latch.countDown();
104
105                    // throw error or runtime exception
106                    if (rand.nextBoolean()) {
107                        throw new Error();
108                    } else {
109                        throw new RuntimeException();
110                    }
111                }
112                public void failed(Throwable exc, Void att) {
113                }
114                public void cancelled(Void att) {
115                }
116            });
117
118            // establish loopback connection which should cause completion
119            // handler to be invoked.
120            int port = ((InetSocketAddress)(listener.getLocalAddress())).getPort();
121            AsynchronousSocketChannel ch = AsynchronousSocketChannel.open();
122            InetAddress lh = InetAddress.getLocalHost();
123            ch.connect(new InetSocketAddress(lh, port)).get();
124            ch.close();
125
126            // wait for handler to be invoked
127            latch.await();
128        }
129
130        // clean-up
131        listener.close();
132    }
133}
134