1 /*

     2  * Copyright 2002 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 4503092

    26  * @summary Tests that Windows Selector can use more than 63 channels

    27  * @run main/timeout=300 LotsOfChannels

    28  * @author kladko

    29  */

    30 

    31 import java.net.*;

    32 import java.io.*;

    33 import java.nio.*;

    34 import java.nio.channels.*;

    35 

    36 public class LotsOfChannels {

    37 

    38     private final static int PIPES_COUNT = 1900;

    39     private final static int BUF_SIZE = 8192;

    40     private final static int LOOPS = 10;

    41 

    42     public static void main(String[] argv) throws Exception {

    43 

    44 

    45         String os = System.getProperty("os.name");

    46         if (!(os.equals("Windows NT")

    47            || os.equals("Windows 2000")

    48            || os.equals("Windows XP")))

    49             return;

    50 

    51         Pipe[] pipes = new Pipe[PIPES_COUNT];

    52         Pipe pipe = Pipe.open();

    53         Pipe.SinkChannel sink = pipe.sink();

    54         Pipe.SourceChannel source = pipe.source();

    55         Selector sel = Selector.open();

    56         source.configureBlocking(false);

    57         source.register(sel, SelectionKey.OP_READ);

    58 

    59         for (int i = 0; i< PIPES_COUNT; i++ ) {

    60             pipes[i]= Pipe.open();

    61             Pipe.SourceChannel sc = pipes[i].source();

    62             sc.configureBlocking(false);

    63             sc.register(sel, SelectionKey.OP_READ);

    64             Pipe.SinkChannel sc2 = pipes[i].sink();

    65             sc2.configureBlocking(false);

    66             sc2.register(sel, SelectionKey.OP_WRITE);

    67         }

    68 

    69         for (int i = 0 ; i < LOOPS; i++ ) {

    70             sink.write(ByteBuffer.allocate(BUF_SIZE));

    71             int x = sel.selectNow();

    72             sel.selectedKeys().clear();

    73             source.read(ByteBuffer.allocate(BUF_SIZE));

    74         }

    75         sel.close();

    76     }

    77 }