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