/*

 * 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

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

/*

 * 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.*;

/**

 * A Multi-threaded dispatcher.

 * <P>

 * In this example, one thread does accepts, and the second

 * does read/writes.

 *

 * @author Mark Reinhold

 * @author Brad R. Wetmore

 */

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);

        }

    }

}