1 // ========================================================================
2 // Copyright (c) 2008-2009 Mort Bay Consulting Pty. Ltd.
3 // ------------------------------------------------------------------------
4 // All rights reserved. This program and the accompanying materials
5 // are made available under the terms of the Eclipse Public License v1.0
6 // and Apache License v2.0 which accompanies this distribution.
7 // The Eclipse Public License is available at
8 // http://www.eclipse.org/legal/epl-v10.html
9 // The Apache License v2.0 is available at
10 // http://www.opensource.org/licenses/apache2.0.php
11 // You may elect to redistribute this code under either of these licenses.
12 // ========================================================================
13
14 package org.eclipse.jetty.server.nio;
15
16 import java.io.IOException;
17 import java.nio.channels.Channel;
18 import java.nio.channels.ServerSocketChannel;
19
20 import org.eclipse.jetty.util.log.Log;
21 import org.eclipse.jetty.util.log.Logger;
22
23 /**
24 * An implementation of the SelectChannelConnector which first tries to
25 * inherit from a channel provided by the system. If there is no inherited
26 * channel available, or if the inherited channel provided not usable, then
27 * it will fall back upon normal ServerSocketChannel creation.
28 * <p>
29 * Note that System.inheritedChannel() is only available from Java 1.5 onwards.
30 * Trying to use this class under Java 1.4 will be the same as using a normal
31 * SelectChannelConnector.
32 * <p>
33 * Use it with xinetd/inetd, to launch an instance of Jetty on demand. The port
34 * used to access pages on the Jetty instance is the same as the port used to
35 * launch Jetty.
36 *
37 * @author athena
38 */
39 public class InheritedChannelConnector extends SelectChannelConnector
40 {
41 private static final Logger LOG = Log.getLogger(InheritedChannelConnector.class);
42
43 /* ------------------------------------------------------------ */
44 @Override
45 public void open() throws IOException
46 {
47 synchronized(this)
48 {
49 try
50 {
51 Channel channel = System.inheritedChannel();
52 if ( channel instanceof ServerSocketChannel )
53 _acceptChannel = (ServerSocketChannel)channel;
54 else
55 LOG.warn("Unable to use System.inheritedChannel() [" +channel+ "]. Trying a new ServerSocketChannel at " + getHost() + ":" + getPort());
56
57 if ( _acceptChannel != null )
58 _acceptChannel.configureBlocking(true);
59 }
60 catch(NoSuchMethodError e)
61 {
62 LOG.warn("Need at least Java 5 to use socket inherited from xinetd/inetd.");
63 }
64
65 if (_acceptChannel == null)
66 super.open();
67 }
68 }
69
70 }