01: /*
02: * Copyright 2001-2005 Sun Microsystems, Inc. All Rights Reserved.
03: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
04: *
05: * This code is free software; you can redistribute it and/or modify it
06: * under the terms of the GNU General Public License version 2 only, as
07: * published by the Free Software Foundation. Sun designates this
08: * particular file as subject to the "Classpath" exception as provided
09: * by Sun in the LICENSE file that accompanied this code.
10: *
11: * This code is distributed in the hope that it will be useful, but WITHOUT
12: * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13: * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14: * version 2 for more details (a copy is included in the LICENSE file that
15: * accompanied this code).
16: *
17: * You should have received a copy of the GNU General Public License version
18: * 2 along with this work; if not, write to the Free Software Foundation,
19: * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20: *
21: * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22: * CA 95054 USA or visit www.sun.com if you need additional information or
23: * have any questions.
24: */
25:
26: package sun.nio.ch;
27:
28: import java.nio.channels.spi.SelectorProvider;
29: import java.security.AccessController;
30: import java.security.PrivilegedAction;
31: import sun.security.action.GetPropertyAction;
32:
33: /**
34: * Creates this platform's default SelectorProvider
35: */
36:
37: public class DefaultSelectorProvider {
38:
39: /**
40: * Prevent instantiation.
41: */
42: private DefaultSelectorProvider() {
43: }
44:
45: /**
46: * Returns the default SelectorProvider.
47: */
48: public static SelectorProvider create() {
49: PrivilegedAction pa = new GetPropertyAction("os.name");
50: String osname = (String) AccessController.doPrivileged(pa);
51: if ("SunOS".equals(osname)) {
52: return new sun.nio.ch.DevPollSelectorProvider();
53: }
54:
55: // use EPollSelectorProvider for Linux kernels >= 2.6
56: if ("Linux".equals(osname)) {
57: pa = new GetPropertyAction("os.version");
58: String osversion = (String) AccessController
59: .doPrivileged(pa);
60: String[] vers = osversion.split("\\.", 0);
61: if (vers.length >= 2) {
62: try {
63: int major = Integer.parseInt(vers[0]);
64: int minor = Integer.parseInt(vers[1]);
65: if (major > 2 || (major == 2 && minor >= 6)) {
66: return new sun.nio.ch.EPollSelectorProvider();
67: }
68: } catch (NumberFormatException x) {
69: // format not recognized
70: }
71: }
72: }
73:
74: return new sun.nio.ch.PollSelectorProvider();
75: }
76:
77: }
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