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| 1 | +/* | |
| 2 | + * Copyright (c) 2001, 2008, Oracle and/or its affiliates. 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. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * 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 | + // Lock for close and cleanup | |
| 62 | + private Object closeLock = new Object(); | |
| 63 | + | |
| 64 | + AbstractPollSelectorImpl(SelectorProvider sp, int channels, int offset) { | |
| 65 | + super(sp); | |
| 66 | + this.totalChannels = channels; | |
| 67 | + this.channelOffset = offset; | |
| 68 | + } | |
| 69 | + | |
| 70 | + void putEventOps(SelectionKeyImpl sk, int ops) { | |
| 71 | + synchronized (closeLock) { | |
| 72 | + if (closed) | |
| 73 | + throw new ClosedSelectorException(); | |
| 74 | + pollWrapper.putEventOps(sk.getIndex(), ops); | |
| 75 | + } | |
| 76 | + } | |
| 77 | + | |
| 78 | + public Selector wakeup() { | |
| 79 | + pollWrapper.interrupt(); | |
| 80 | + return this; | |
| 81 | + } | |
| 82 | + | |
| 83 | + protected abstract int doSelect(long timeout) throws IOException; | |
| 84 | + | |
| 85 | + protected void implClose() throws IOException { | |
| 86 | + synchronized (closeLock) { | |
| 87 | + if (closed) | |
| 88 | + return; | |
| 89 | + closed = true; | |
| 90 | + // Deregister channels | |
| 91 | + for(int i=channelOffset; i<totalChannels; i++) { | |
| 92 | + SelectionKeyImpl ski = channelArray[i]; | |
| 93 | + assert(ski.getIndex() != -1); | |
| 94 | + ski.setIndex(-1); | |
| 95 | + deregister(ski); | |
| 96 | + SelectableChannel selch = channelArray[i].channel(); | |
| 97 | + if (!selch.isOpen() && !selch.isRegistered()) | |
| 98 | + ((SelChImpl)selch).kill(); | |
| 99 | + } | |
| 100 | + implCloseInterrupt(); | |
| 101 | + pollWrapper.free(); | |
| 102 | + pollWrapper = null; | |
| 103 | + selectedKeys = null; | |
| 104 | + channelArray = null; | |
| 105 | + totalChannels = 0; | |
| 106 | + } | |
| 107 | + } | |
| 108 | + | |
| 109 | + protected abstract void implCloseInterrupt() throws IOException; | |
| 110 | + | |
| 111 | + /** | |
| 112 | + * Copy the information in the pollfd structs into the opss | |
| 113 | + * of the corresponding Channels. Add the ready keys to the | |
| 114 | + * ready queue. | |
| 115 | + */ | |
| 116 | + protected int updateSelectedKeys() { | |
| 117 | + int numKeysUpdated = 0; | |
| 118 | + // Skip zeroth entry; it is for interrupts only | |
| 119 | + for (int i=channelOffset; i<totalChannels; i++) { | |
| 120 | + int rOps = pollWrapper.getReventOps(i); | |
| 121 | + if (rOps != 0) { | |
| 122 | + SelectionKeyImpl sk = channelArray[i]; | |
| 123 | + pollWrapper.putReventOps(i, 0); | |
| 124 | + if (selectedKeys.contains(sk)) { | |
| 125 | + if (sk.channel.translateAndSetReadyOps(rOps, sk)) { | |
| 126 | + numKeysUpdated++; | |
| 127 | + } | |
| 128 | + } else { | |
| 129 | + sk.channel.translateAndSetReadyOps(rOps, sk); | |
| 130 | + if ((sk.nioReadyOps() & sk.nioInterestOps()) != 0) { | |
| 131 | + selectedKeys.add(sk); | |
| 132 | + numKeysUpdated++; | |
| 133 | + } | |
| 134 | + } | |
| 135 | + } | |
| 136 | + } | |
| 137 | + return numKeysUpdated; | |
| 138 | + } | |
| 139 | + | |
| 140 | + protected void implRegister(SelectionKeyImpl ski) { | |
| 141 | + synchronized (closeLock) { | |
| 142 | + if (closed) | |
| 143 | + throw new ClosedSelectorException(); | |
| 144 | + | |
| 145 | + // Check to see if the array is large enough | |
| 146 | + if (channelArray.length == totalChannels) { | |
| 147 | + // Make a larger array | |
| 148 | + int newSize = pollWrapper.totalChannels * 2; | |
| 149 | + SelectionKeyImpl temp[] = new SelectionKeyImpl[newSize]; | |
| 150 | + // Copy over | |
| 151 | + for (int i=channelOffset; i<totalChannels; i++) | |
| 152 | + temp[i] = channelArray[i]; | |
| 153 | + channelArray = temp; | |
| 154 | + // Grow the NativeObject poll array | |
| 155 | + pollWrapper.grow(newSize); | |
| 156 | + } | |
| 157 | + channelArray[totalChannels] = ski; | |
| 158 | + ski.setIndex(totalChannels); | |
| 159 | + pollWrapper.addEntry(ski.channel); | |
| 160 | + totalChannels++; | |
| 161 | + keys.add(ski); | |
| 162 | + } | |
| 163 | + } | |
| 164 | + | |
| 165 | + protected void implDereg(SelectionKeyImpl ski) throws IOException { | |
| 166 | + // Algorithm: Copy the sc from the end of the list and put it into | |
| 167 | + // the location of the sc to be removed (since order doesn't | |
| 168 | + // matter). Decrement the sc count. Update the index of the sc | |
| 169 | + // that is moved. | |
| 170 | + int i = ski.getIndex(); | |
| 171 | + assert (i >= 0); | |
| 172 | + if (i != totalChannels - 1) { | |
| 173 | + // Copy end one over it | |
| 174 | + SelectionKeyImpl endChannel = channelArray[totalChannels-1]; | |
| 175 | + channelArray[i] = endChannel; | |
| 176 | + endChannel.setIndex(i); | |
| 177 | + pollWrapper.release(i); | |
| 178 | + PollArrayWrapper.replaceEntry(pollWrapper, totalChannels - 1, | |
| 179 | + pollWrapper, i); | |
| 180 | + } else { | |
| 181 | + pollWrapper.release(i); | |
| 182 | + } | |
| 183 | + // Destroy the last one | |
| 184 | + channelArray[totalChannels-1] = null; | |
| 185 | + totalChannels--; | |
| 186 | + pollWrapper.totalChannels--; | |
| 187 | + ski.setIndex(-1); | |
| 188 | + // Remove the key from keys and selectedKeys | |
| 189 | + keys.remove(ski); | |
| 190 | + selectedKeys.remove(ski); | |
| 191 | + deregister((AbstractSelectionKey)ski); | |
| 192 | + SelectableChannel selch = ski.channel(); | |
| 193 | + if (!selch.isOpen() && !selch.isRegistered()) | |
| 194 | + ((SelChImpl)selch).kill(); | |
| 195 | + } | |
| 196 | + | |
| 197 | + static { | |
| 198 | + Util.load(); | |
| 199 | + } | |
| 200 | + | |
| 201 | +} | |