J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2001-2004 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package sun.nio.ch; |
| 27 | |
| 28 | import java.io.IOException; |
| 29 | import java.nio.channels.*; |
| 30 | import java.nio.channels.spi.*; |
| 31 | import java.util.*; |
| 32 | import sun.misc.*; |
| 33 | |
| 34 | |
| 35 | /** |
| 36 | * An abstract selector impl. |
| 37 | */ |
| 38 | |
| 39 | abstract class AbstractPollSelectorImpl |
| 40 | extends SelectorImpl |
| 41 | { |
| 42 | |
| 43 | // The poll fd array |
| 44 | PollArrayWrapper pollWrapper; |
| 45 | |
| 46 | // Initial capacity of the pollfd array |
| 47 | protected final int INIT_CAP = 10; |
| 48 | |
| 49 | // The list of SelectableChannels serviced by this Selector |
| 50 | protected SelectionKeyImpl[] channelArray; |
| 51 | |
| 52 | // In some impls the first entry of channelArray is bogus |
| 53 | protected int channelOffset = 0; |
| 54 | |
| 55 | // The number of valid channels in this Selector's poll array |
| 56 | protected int totalChannels; |
| 57 | |
| 58 | // True if this Selector has been closed |
| 59 | private boolean closed = false; |
| 60 | |
| 61 | AbstractPollSelectorImpl(SelectorProvider sp, int channels, int offset) { |
| 62 | super(sp); |
| 63 | this.totalChannels = channels; |
| 64 | this.channelOffset = offset; |
| 65 | } |
| 66 | |
| 67 | void putEventOps(SelectionKeyImpl sk, int ops) { |
| 68 | pollWrapper.putEventOps(sk.getIndex(), ops); |
| 69 | } |
| 70 | |
| 71 | public Selector wakeup() { |
| 72 | pollWrapper.interrupt(); |
| 73 | return this; |
| 74 | } |
| 75 | |
| 76 | protected abstract int doSelect(long timeout) throws IOException; |
| 77 | |
| 78 | protected void implClose() throws IOException { |
| 79 | if (!closed) { |
| 80 | closed = true; |
| 81 | // Deregister channels |
| 82 | for(int i=channelOffset; i<totalChannels; i++) { |
| 83 | SelectionKeyImpl ski = channelArray[i]; |
| 84 | assert(ski.getIndex() != -1); |
| 85 | ski.setIndex(-1); |
| 86 | deregister(ski); |
| 87 | SelectableChannel selch = channelArray[i].channel(); |
| 88 | if (!selch.isOpen() && !selch.isRegistered()) |
| 89 | ((SelChImpl)selch).kill(); |
| 90 | } |
| 91 | implCloseInterrupt(); |
| 92 | pollWrapper.free(); |
| 93 | pollWrapper = null; |
| 94 | selectedKeys = null; |
| 95 | channelArray = null; |
| 96 | totalChannels = 0; |
| 97 | } |
| 98 | } |
| 99 | |
| 100 | protected abstract void implCloseInterrupt() throws IOException; |
| 101 | |
| 102 | /** |
| 103 | * Copy the information in the pollfd structs into the opss |
| 104 | * of the corresponding Channels. Add the ready keys to the |
| 105 | * ready queue. |
| 106 | */ |
| 107 | protected int updateSelectedKeys() { |
| 108 | int numKeysUpdated = 0; |
| 109 | // Skip zeroth entry; it is for interrupts only |
| 110 | for (int i=channelOffset; i<totalChannels; i++) { |
| 111 | int rOps = pollWrapper.getReventOps(i); |
| 112 | if (rOps != 0) { |
| 113 | SelectionKeyImpl sk = channelArray[i]; |
| 114 | pollWrapper.putReventOps(i, 0); |
| 115 | if (selectedKeys.contains(sk)) { |
| 116 | if (sk.channel.translateAndSetReadyOps(rOps, sk)) { |
| 117 | numKeysUpdated++; |
| 118 | } |
| 119 | } else { |
| 120 | sk.channel.translateAndSetReadyOps(rOps, sk); |
| 121 | if ((sk.nioReadyOps() & sk.nioInterestOps()) != 0) { |
| 122 | selectedKeys.add(sk); |
| 123 | numKeysUpdated++; |
| 124 | } |
| 125 | } |
| 126 | } |
| 127 | } |
| 128 | return numKeysUpdated; |
| 129 | } |
| 130 | |
| 131 | protected void implRegister(SelectionKeyImpl ski) { |
| 132 | // Check to see if the array is large enough |
| 133 | if (channelArray.length == totalChannels) { |
| 134 | // Make a larger array |
| 135 | int newSize = pollWrapper.totalChannels * 2; |
| 136 | SelectionKeyImpl temp[] = new SelectionKeyImpl[newSize]; |
| 137 | // Copy over |
| 138 | for (int i=channelOffset; i<totalChannels; i++) |
| 139 | temp[i] = channelArray[i]; |
| 140 | channelArray = temp; |
| 141 | // Grow the NativeObject poll array |
| 142 | pollWrapper.grow(newSize); |
| 143 | } |
| 144 | channelArray[totalChannels] = ski; |
| 145 | ski.setIndex(totalChannels); |
| 146 | pollWrapper.addEntry(ski.channel); |
| 147 | totalChannels++; |
| 148 | keys.add(ski); |
| 149 | } |
| 150 | |
| 151 | protected void implDereg(SelectionKeyImpl ski) throws IOException { |
| 152 | // Algorithm: Copy the sc from the end of the list and put it into |
| 153 | // the location of the sc to be removed (since order doesn't |
| 154 | // matter). Decrement the sc count. Update the index of the sc |
| 155 | // that is moved. |
| 156 | int i = ski.getIndex(); |
| 157 | assert (i >= 0); |
| 158 | if (i != totalChannels - 1) { |
| 159 | // Copy end one over it |
| 160 | SelectionKeyImpl endChannel = channelArray[totalChannels-1]; |
| 161 | channelArray[i] = endChannel; |
| 162 | endChannel.setIndex(i); |
| 163 | pollWrapper.release(i); |
| 164 | PollArrayWrapper.replaceEntry(pollWrapper, totalChannels - 1, |
| 165 | pollWrapper, i); |
| 166 | } else { |
| 167 | pollWrapper.release(i); |
| 168 | } |
| 169 | // Destroy the last one |
| 170 | channelArray[totalChannels-1] = null; |
| 171 | totalChannels--; |
| 172 | pollWrapper.totalChannels--; |
| 173 | ski.setIndex(-1); |
| 174 | // Remove the key from keys and selectedKeys |
| 175 | keys.remove(ski); |
| 176 | selectedKeys.remove(ski); |
| 177 | deregister((AbstractSelectionKey)ski); |
| 178 | SelectableChannel selch = ski.channel(); |
| 179 | if (!selch.isOpen() && !selch.isRegistered()) |
| 180 | ((SelChImpl)selch).kill(); |
| 181 | } |
| 182 | |
| 183 | static { |
| 184 | Util.load(); |
| 185 | } |
| 186 | |
| 187 | } |