151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski/* 2519adb2f61bb2bfa6cc993b1ca15cf7022b96697Shubham Ajmera * Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved. 351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This code is free software; you can redistribute it and/or modify it 651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * under the terms of the GNU General Public License version 2 only, as 751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * published by the Free Software Foundation. Oracle designates this 851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * particular file as subject to the "Classpath" exception as provided 951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * by Oracle in the LICENSE file that accompanied this code. 1051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 1151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This code is distributed in the hope that it will be useful, but WITHOUT 1251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 1351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 1451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * version 2 for more details (a copy is included in the LICENSE file that 1551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * accompanied this code). 1651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 1751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * You should have received a copy of the GNU General Public License version 1851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 2 along with this work; if not, write to the Free Software Foundation, 1951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 2051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 2151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 2251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * or visit www.oracle.com if you need additional information or have any 2351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * questions. 2451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 2551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 2651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebskipackage sun.nio.ch; 2751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 2851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebskiimport java.io.IOException; 2951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebskiimport java.nio.channels.*; 3051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebskiimport java.nio.channels.spi.*; 3151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebskiimport java.net.SocketException; 3251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebskiimport java.util.*; 3351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 3451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 3551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski/** 3651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Base Selector implementation class. 3751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 3851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 39519adb2f61bb2bfa6cc993b1ca15cf7022b96697Shubham Ajmerapublic abstract class SelectorImpl 4051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski extends AbstractSelector 4151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski{ 4251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 4351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski // The set of keys with data ready for an operation 4451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski protected Set<SelectionKey> selectedKeys; 4551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 4651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski // The set of keys registered with this Selector 4751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski protected HashSet<SelectionKey> keys; 4851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 4951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski // Public views of the key sets 5051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private Set<SelectionKey> publicKeys; // Immutable 5151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private Set<SelectionKey> publicSelectedKeys; // Removal allowed, but not addition 5251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 5351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski protected SelectorImpl(SelectorProvider sp) { 5451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski super(sp); 5551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski keys = new HashSet<SelectionKey>(); 5651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski selectedKeys = new HashSet<SelectionKey>(); 5751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (Util.atBugLevel("1.4")) { 5851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski publicKeys = keys; 5951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski publicSelectedKeys = selectedKeys; 6051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } else { 6151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski publicKeys = Collections.unmodifiableSet(keys); 6251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski publicSelectedKeys = Util.ungrowableSet(selectedKeys); 6351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 6451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 6551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 6651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public Set<SelectionKey> keys() { 6751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (!isOpen() && !Util.atBugLevel("1.4")) 6851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new ClosedSelectorException(); 6951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return publicKeys; 7051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 7151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 7251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public Set<SelectionKey> selectedKeys() { 7351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (!isOpen() && !Util.atBugLevel("1.4")) 7451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new ClosedSelectorException(); 7551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return publicSelectedKeys; 7651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 7751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 7851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski protected abstract int doSelect(long timeout) throws IOException; 7951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 8051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private int lockAndDoSelect(long timeout) throws IOException { 8151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski synchronized (this) { 8251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (!isOpen()) 8351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new ClosedSelectorException(); 8451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski synchronized (publicKeys) { 8551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski synchronized (publicSelectedKeys) { 8651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return doSelect(timeout); 8751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 8851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 8951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 9051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 9151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 9251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public int select(long timeout) 9351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throws IOException 9451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski { 9551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (timeout < 0) 9651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new IllegalArgumentException("Negative timeout"); 9751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return lockAndDoSelect((timeout == 0) ? -1 : timeout); 9851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 9951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 10051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public int select() throws IOException { 10151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return select(0); 10251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 10351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 10451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public int selectNow() throws IOException { 10551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return lockAndDoSelect(0); 10651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 10751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 10851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public void implCloseSelector() throws IOException { 10951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski wakeup(); 11051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski synchronized (this) { 11151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski synchronized (publicKeys) { 11251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski synchronized (publicSelectedKeys) { 11351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski implClose(); 11451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 11551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 11651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 11751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 11851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 11951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski protected abstract void implClose() throws IOException; 12051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 121519adb2f61bb2bfa6cc993b1ca15cf7022b96697Shubham Ajmera public void putEventOps(SelectionKeyImpl sk, int ops) { } 12251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 12351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski protected final SelectionKey register(AbstractSelectableChannel ch, 12451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ops, 12551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Object attachment) 12651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski { 12751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (!(ch instanceof SelChImpl)) 12851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new IllegalSelectorException(); 12951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski SelectionKeyImpl k = new SelectionKeyImpl((SelChImpl)ch, this); 13051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski k.attach(attachment); 13151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski synchronized (publicKeys) { 13251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski implRegister(k); 13351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 13451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski k.interestOps(ops); 13551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return k; 13651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 13751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 13851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski protected abstract void implRegister(SelectionKeyImpl ski); 13951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 14051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski void processDeregisterQueue() throws IOException { 14151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski // Precondition: Synchronized on this, keys, and selectedKeys 142519adb2f61bb2bfa6cc993b1ca15cf7022b96697Shubham Ajmera Set<SelectionKey> cks = cancelledKeys(); 14351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski synchronized (cks) { 14451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (!cks.isEmpty()) { 145519adb2f61bb2bfa6cc993b1ca15cf7022b96697Shubham Ajmera Iterator<SelectionKey> i = cks.iterator(); 14651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski while (i.hasNext()) { 14751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski SelectionKeyImpl ski = (SelectionKeyImpl)i.next(); 14851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski try { 14951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski implDereg(ski); 15051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } catch (SocketException se) { 151519adb2f61bb2bfa6cc993b1ca15cf7022b96697Shubham Ajmera throw new IOException("Error deregistering key", se); 15251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } finally { 15351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski i.remove(); 15451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 15551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 15651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 15751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 15851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 15951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 16051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski protected abstract void implDereg(SelectionKeyImpl ski) throws IOException; 16151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 16251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski abstract public Selector wakeup(); 16351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 16451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski} 165