1 //
2 // ========================================================================
3 // Copyright (c) 1995-2013 Mort Bay Consulting Pty. Ltd.
4 // ------------------------------------------------------------------------
5 // All rights reserved. This program and the accompanying materials
6 // are made available under the terms of the Eclipse Public License v1.0
7 // and Apache License v2.0 which accompanies this distribution.
8 //
9 // The Eclipse Public License is available at
10 // http://www.eclipse.org/legal/epl-v10.html
11 //
12 // The Apache License v2.0 is available at
13 // http://www.opensource.org/licenses/apache2.0.php
14 //
15 // You may elect to redistribute this code under either of these licenses.
16 // ========================================================================
17 //
18
19 package org.eclipse.jetty.server.nio;
20
21 import java.io.IOException;
22 import java.nio.channels.Channel;
23 import java.nio.channels.ServerSocketChannel;
24
25 import org.eclipse.jetty.util.log.Log;
26 import org.eclipse.jetty.util.log.Logger;
27
28 /**
29 * An implementation of the SelectChannelConnector which first tries to
30 * inherit from a channel provided by the system. If there is no inherited
31 * channel available, or if the inherited channel provided not usable, then
32 * it will fall back upon normal ServerSocketChannel creation.
33 * <p>
34 * Note that System.inheritedChannel() is only available from Java 1.5 onwards.
35 * Trying to use this class under Java 1.4 will be the same as using a normal
36 * SelectChannelConnector.
37 * <p>
38 * Use it with xinetd/inetd, to launch an instance of Jetty on demand. The port
39 * used to access pages on the Jetty instance is the same as the port used to
40 * launch Jetty.
41 *
42 * @author athena
43 */
44 public class InheritedChannelConnector extends SelectChannelConnector
45 {
46 private static final Logger LOG = Log.getLogger(InheritedChannelConnector.class);
47
48 /* ------------------------------------------------------------ */
49 @Override
50 public void open() throws IOException
51 {
52 synchronized(this)
53 {
54 try
55 {
56 Channel channel = System.inheritedChannel();
57 if ( channel instanceof ServerSocketChannel )
58 _acceptChannel = (ServerSocketChannel)channel;
59 else
60 LOG.warn("Unable to use System.inheritedChannel() [" +channel+ "]. Trying a new ServerSocketChannel at " + getHost() + ":" + getPort());
61
62 if ( _acceptChannel != null )
63 _acceptChannel.configureBlocking(true);
64 }
65 catch(NoSuchMethodError e)
66 {
67 LOG.warn("Need at least Java 5 to use socket inherited from xinetd/inetd.");
68 }
69
70 if (_acceptChannel == null)
71 super.open();
72 }
73 }
74
75 }