Open.java revision 17314:129efb64cb37 
1/*
2 * Copyright (c) 2002, 2017, 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
24import java.net.SocketException;
25import java.nio.channels.DatagramChannel;
26import java.nio.channels.Pipe;
27import java.nio.channels.ServerSocketChannel;
28import java.nio.channels.SocketChannel;
29import java.nio.channels.spi.SelectorProvider;
30
31public class Open {
32
33    static void test1() {
34        for (int i=0; i<11000; i++) {
35            try {
36                SocketChannel sc = SocketChannel.open();
37            } catch (Exception e) {
38                // Presumably "Too many open files"
39            }
40        }
41    }
42    static void test2() {
43        for (int i=0; i<11000; i++) {
44            try {
45                DatagramChannel sc = DatagramChannel.open();
46            } catch (Exception e) {
47                // Presumably "Too many open files"
48            }
49        }
50    }
51    static void test3() {
52        SelectorProvider sp = SelectorProvider.provider();
53        for (int i=0; i<11000; i++) {
54            try {
55                Pipe p = sp.openPipe();
56            } catch (Exception e) {
57                // Presumably "Too many open files"
58            }
59        }
60    }
61    static void test4() {
62        for (int i=0; i<11000; i++) {
63            try {
64                ServerSocketChannel sc = ServerSocketChannel.open();
65            } catch (Exception e) {
66                // Presumably "Too many open files"
67            }
68        }
69    }
70
71    public static void main(String[] args) throws Exception {
72
73        // Load necessary classes ahead of time
74        DatagramChannel dc = DatagramChannel.open();
75        Exception se = new SocketException();
76        SelectorProvider sp = SelectorProvider.provider();
77        Pipe p = sp.openPipe();
78        ServerSocketChannel ssc = ServerSocketChannel.open();
79
80        test1();
81        test2();
82        test3();
83        test4();
84    }
85
86}
87