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Java > Open Source Codes > DispatcherN


1 /*
2  * @(#)DispatcherN.java 1.3 05/11/17
3  *
4  * Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions are met:
8  *
9  * -Redistribution of source code must retain the above copyright notice, this
10  * list of conditions and the following disclaimer.
11  *
12  * -Redistribution in binary form must reproduce the above copyright notice,
13  * this list of conditions and the following disclaimer in the documentation
14  * and/or other materials provided with the distribution.
15  *
16  * Neither the name of Sun Microsystems, Inc. or the names of contributors may
17  * be used to endorse or promote products derived from this software without
18  * specific prior written permission.
19  *
20  * This software is provided "AS IS," without a warranty of any kind. ALL
21  * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
22  * ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
23  * OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN")
24  * AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE
25  * AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
26  * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST
27  * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL,
28  * INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY
29  * OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
30  * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
31  *
32  * You acknowledge that this software is not designed, licensed or intended
33  * for use in the design, construction, operation or maintenance of any
34  * nuclear facility.
35  */
36
37 import java.io.*;
38 import java.nio.channels.*;
39 import java.util.*;
40
41 /**
42  * A Multi-threaded dispatcher.
43  * <P>
44  * In this example, one thread does accepts, and the second
45  * does read/writes.
46  *
47  * @author Mark Reinhold
48  * @author Brad R. Wetmore
49  * @version 1.3, 05/11/17
50  */
51 class DispatcherN implements Dispatcher {
52
53     private Selector sel;
54
55     DispatcherN() throws IOException {
56     sel = Selector.open();
57     }
58
59     public void run() {
60     for (;;) {
61         try {
62         dispatch();
63         } catch (IOException x) {
64         x.printStackTrace();
65         }
66     }
67     }
68
69     private Object JavaDoc gate = new Object JavaDoc();
70
71     private void dispatch() throws IOException {
72     sel.select();
73     for (Iterator i = sel.selectedKeys().iterator(); i.hasNext(); ) {
74         SelectionKey sk = (SelectionKey)i.next();
75         i.remove();
76         Handler h = (Handler)sk.attachment();
77         h.handle(sk);
78     }
79     synchronized (gate) { }
80     }
81
82     public void register(SelectableChannel ch, int ops, Handler h)
83         throws IOException {
84     synchronized (gate) {
85         sel.wakeup();
86         ch.register(sel, ops, h);
87     }
88     }
89
90 }
91
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