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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 single-threaded dispatcher.
     47  * <P>
     48  * When a SelectionKey is ready, it dispatches the job in this
     49  * thread.
     50  *
     51  * @author Mark Reinhold
     52  * @author Brad R. Wetmore
     53  */
     54 class Dispatcher1 implements Dispatcher {
     55 
     56     private Selector sel;
     57 
     58     Dispatcher1() throws IOException {
     59         sel = Selector.open();
     60     }
     61 
     62     // Doesn't really need to be runnable
     63     public void run() {
     64         for (;;) {
     65             try {
     66                 dispatch();
     67             } catch (IOException x) {
     68                 x.printStackTrace();
     69             }
     70         }
     71     }
     72 
     73     private void dispatch() throws IOException {
     74         sel.select();
     75         for (Iterator i = sel.selectedKeys().iterator(); i.hasNext(); ) {
     76             SelectionKey sk = (SelectionKey)i.next();
     77             i.remove();
     78             Handler h = (Handler)sk.attachment();
     79             h.handle(sk);
     80         }
     81     }
     82 
     83     public void register(SelectableChannel ch, int ops, Handler h)
     84             throws IOException {
     85         ch.register(sel, ops, h);
     86     }
     87 }
     88