1 /*

     2  * Copyright (c) 2002, 2013, 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.

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     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

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    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

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    23 

    24 /* @test

    25  * @bug 4777504 8024883

    26  * @summary Ensure that a Selector can return at least 100 selected keys

    27  * @author Mark Reinhold

    28  * @library ..

    29  * @build SelectorLimit

    30  * @run main/othervm SelectorLimit

    31  * @run main/othervm -Dsun.nio.ch.maxUpdateArraySize=128 SelectorLimit

    32  */

    33 

    34 import java.io.*;

    35 import java.net.*;

    36 import java.nio.*;

    37 import java.nio.channels.*;

    38 import java.util.*;

    39 

    40 

    41 public class SelectorLimit {

    42 

    43     static PrintStream log = System.err;

    44 

    45     static class Listener

    46         extends TestThread

    47     {

    48         volatile int count = 0;

    49         private ServerSocketChannel ssc;

    50 

    51         Listener(ServerSocketChannel ssc) {

    52             super("Listener");

    53             this.ssc = ssc;

    54         }

    55 

    56         void go() throws IOException {

    57             for (;;) {

    58                 ssc.accept();

    59                 count++;

    60             }

    61         }

    62 

    63     }

    64 

    65     static final int N_KEYS = 500;

    66     static final int MIN_KEYS = 100;

    67 

    68     public static void main(String[] args) throws Exception {

    69         ServerSocketChannel ssc = ServerSocketChannel.open();

    70         TestUtil.bind(ssc);

    71         Listener lth = new Listener(ssc);

    72         lth.start();

    73 

    74         Selector sel = Selector.open();

    75         SocketChannel[] sca = new SocketChannel[N_KEYS];

    76         for (int i = 0; i < N_KEYS; i++) {

    77             SocketChannel sc = SocketChannel.open();

    78             sc.configureBlocking(false);

    79             sc.register(sel, SelectionKey.OP_CONNECT | SelectionKey.OP_WRITE);

    80             sc.connect(ssc.socket().getLocalSocketAddress());

    81         }

    82 

    83         for (int i = 0; i < 10; i++) {

    84             if (lth.count >= MIN_KEYS)

    85                 break;

    86             Thread.sleep(1000);

    87         }

    88         log.println(lth.count + " connections accepted");

    89         Thread.sleep(500);

    90 

    91         int n = sel.select();

    92         log.println(n + " keys selected");

    93         if (n < MIN_KEYS)

    94             throw new Exception("Only selected " + n + " keys");

    95 

    96     }

    97 

    98 }