DispatcherN.java

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/*
 * Copyright (c) 2004, 2011, Oracle and/or its affiliates. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Oracle nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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/*
 * This source code is provided to illustrate the usage of a given feature
 * or technique and has been deliberately simplified. Additional steps
 * required for a production-quality application, such as security checks,
 * input validation and proper error handling, might not be present in
 * this sample code.
 */
 
 
import java.io.*;
import java.nio.channels.*;
import java.util.*;
 
class DispatcherN implements Dispatcher {
 
    private Selector sel;
 
    DispatcherN() throws IOException {
        sel = Selector.open();
    }
 
    public void run() {
        for (;;) {
            try {
                dispatch();
            } catch (IOException x) {
                x.printStackTrace();
            }
        }
    }
 
    private Object gate = new Object();
 
    private void dispatch() throws IOException {
        sel.select();
        for (Iterator i = sel.selectedKeys().iterator(); i.hasNext(); ) {
            SelectionKey sk = (SelectionKey)i.next();
            i.remove();
            Handler h = (Handler)sk.attachment();
            h.handle(sk);
        }
        synchronized (gate) { }
    }
 
    public void register(SelectableChannel ch, int ops, Handler h)
            throws IOException {
        synchronized (gate) {
            sel.wakeup();
            ch.register(sel, ops, h);
        }
    }
 
}