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      1 /*
      2  * Copyright (c) 2004, 2011, Oracle and/or its affiliates. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  *
      8  *   - Redistributions of source code must retain the above copyright
      9  *     notice, this list of conditions and the following disclaimer.
     10  *
     11  *   - Redistributions in binary form must reproduce the above copyright
     12  *     notice, this list of conditions and the following disclaimer in the
     13  *     documentation and/or other materials provided with the distribution.
     14  *
     15  *   - Neither the name of Oracle nor the names of its
     16  *     contributors may be used to endorse or promote products derived
     17  *     from this software without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
     20  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
     21  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
     23  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     24  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     25  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     26  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
     27  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
     28  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     29  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 /*
     33  * This source code is provided to illustrate the usage of a given feature
     34  * or technique and has been deliberately simplified. Additional steps
     35  * required for a production-quality application, such as security checks,
     36  * input validation and proper error handling, might not be present in
     37  * this sample code.
     38  */
     39 
     40 
     41 import java.io.*;
     42 import java.nio.channels.*;
     43 import java.util.*;
     44 
     45 /**
     46  * A Multi-threaded dispatcher.
     47  * <P>
     48  * In this example, one thread does accepts, and the second
     49  * does read/writes.
     50  *
     51  * @author Mark Reinhold
     52  * @author Brad R. Wetmore
     53  */
     54 class DispatcherN implements Dispatcher {
     55 
     56     private Selector sel;
     57 
     58     DispatcherN() throws IOException {
     59         sel = Selector.open();
     60     }
     61 
     62     public void run() {
     63         for (;;) {
     64             try {
     65                 dispatch();
     66             } catch (IOException x) {
     67                 x.printStackTrace();
     68             }
     69         }
     70     }
     71 
     72     private Object gate = new Object();
     73 
     74     private void dispatch() throws IOException {
     75         sel.select();
     76         for (Iterator i = sel.selectedKeys().iterator(); i.hasNext(); ) {
     77             SelectionKey sk = (SelectionKey)i.next();
     78             i.remove();
     79             Handler h = (Handler)sk.attachment();
     80             h.handle(sk);
     81         }
     82         synchronized (gate) { }
     83     }
     84 
     85     public void register(SelectableChannel ch, int ops, Handler h)
     86             throws IOException {
     87         synchronized (gate) {
     88             sel.wakeup();
     89             ch.register(sel, ops, h);
     90         }
     91     }
     92 
     93 }
     94