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.
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 4503092 8024883
26 * @summary Tests that Windows Selector can use more than 63 channels
27 * @run main LotsOfChannels
28 * @run main/othervm -Dsun.nio.ch.maxUpdateArraySize=64 LotsOfChannels
29 * @author kladko
30 */
31
32import java.net.*;
33import java.io.*;
34import java.nio.*;
35import java.nio.channels.*;
36
37public class LotsOfChannels {
38
39    private final static int PIPES_COUNT = 256;
40    private final static int BUF_SIZE = 8192;
41    private final static int LOOPS = 10;
42
43    public static void main(String[] argv) throws Exception {
44        Pipe[] pipes = new Pipe[PIPES_COUNT];
45        Pipe pipe = Pipe.open();
46        Pipe.SinkChannel sink = pipe.sink();
47        Pipe.SourceChannel source = pipe.source();
48        Selector sel = Selector.open();
49        source.configureBlocking(false);
50        source.register(sel, SelectionKey.OP_READ);
51
52        for (int i = 0; i< PIPES_COUNT; i++ ) {
53            pipes[i]= Pipe.open();
54            Pipe.SourceChannel sc = pipes[i].source();
55            sc.configureBlocking(false);
56            sc.register(sel, SelectionKey.OP_READ);
57            Pipe.SinkChannel sc2 = pipes[i].sink();
58            sc2.configureBlocking(false);
59            sc2.register(sel, SelectionKey.OP_WRITE);
60        }
61
62        for (int i = 0 ; i < LOOPS; i++ ) {
63            sink.write(ByteBuffer.allocate(BUF_SIZE));
64            int x = sel.selectNow();
65            sel.selectedKeys().clear();
66            source.read(ByteBuffer.allocate(BUF_SIZE));
67        }
68
69        for (int i = 0; i < PIPES_COUNT; i++ ) {
70            pipes[i].sink().close();
71            pipes[i].source().close();
72        }
73        pipe.sink().close();
74        pipe.source().close();
75        sel.close();
76    }
77}
78