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Java > Open Source Codes > Dispatcher1


1 /*
2  * @(#)Dispatcher1.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 single-threaded dispatcher.
43  * <P>
44  * When a SelectionKey is ready, it dispatches the job in this
45  * thread.
46  *
47  * @author Mark Reinhold
48  * @author Brad R. Wetmore
49  * @version 1.3, 05/11/17
50  */
51 class Dispatcher1 implements Dispatcher {
52
53     private Selector sel;
54
55     Dispatcher1() throws IOException {
56     sel = Selector.open();
57     }
58
59     // Doesn't really need to be runnable
60 public void run() {
61     for (;;) {
62         try {
63         dispatch();
64         } catch (IOException x) {
65         x.printStackTrace();
66         }
67     }
68     }
69
70     private void dispatch() throws IOException {
71     sel.select();
72     for (Iterator i = sel.selectedKeys().iterator(); i.hasNext(); ) {
73         SelectionKey sk = (SelectionKey)i.next();
74         i.remove();
75         Handler h = (Handler)sk.attachment();
76         h.handle(sk);
77     }
78     }
79
80     public void register(SelectableChannel ch, int ops, Handler h)
81         throws IOException {
82     ch.register(sel, ops, h);
83     }
84 }
85
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