| /* |
| * Copyright (c) 2000, 2008, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.nio.ch; |
| |
| import java.io.IOException; |
| import java.nio.channels.*; |
| import java.nio.channels.spi.*; |
| import java.net.SocketException; |
| import java.util.*; |
| import sun.misc.*; |
| |
| |
| /** |
| * Base Selector implementation class. |
| */ |
| |
| abstract class SelectorImpl |
| extends AbstractSelector |
| { |
| |
| // The set of keys with data ready for an operation |
| protected Set<SelectionKey> selectedKeys; |
| |
| // The set of keys registered with this Selector |
| protected HashSet<SelectionKey> keys; |
| |
| // Public views of the key sets |
| private Set<SelectionKey> publicKeys; // Immutable |
| private Set<SelectionKey> publicSelectedKeys; // Removal allowed, but not addition |
| |
| protected SelectorImpl(SelectorProvider sp) { |
| super(sp); |
| keys = new HashSet<SelectionKey>(); |
| selectedKeys = new HashSet<SelectionKey>(); |
| if (Util.atBugLevel("1.4")) { |
| publicKeys = keys; |
| publicSelectedKeys = selectedKeys; |
| } else { |
| publicKeys = Collections.unmodifiableSet(keys); |
| publicSelectedKeys = Util.ungrowableSet(selectedKeys); |
| } |
| } |
| |
| public Set<SelectionKey> keys() { |
| if (!isOpen() && !Util.atBugLevel("1.4")) |
| throw new ClosedSelectorException(); |
| return publicKeys; |
| } |
| |
| public Set<SelectionKey> selectedKeys() { |
| if (!isOpen() && !Util.atBugLevel("1.4")) |
| throw new ClosedSelectorException(); |
| return publicSelectedKeys; |
| } |
| |
| protected abstract int doSelect(long timeout) throws IOException; |
| |
| private int lockAndDoSelect(long timeout) throws IOException { |
| synchronized (this) { |
| if (!isOpen()) |
| throw new ClosedSelectorException(); |
| synchronized (publicKeys) { |
| synchronized (publicSelectedKeys) { |
| return doSelect(timeout); |
| } |
| } |
| } |
| } |
| |
| public int select(long timeout) |
| throws IOException |
| { |
| if (timeout < 0) |
| throw new IllegalArgumentException("Negative timeout"); |
| return lockAndDoSelect((timeout == 0) ? -1 : timeout); |
| } |
| |
| public int select() throws IOException { |
| return select(0); |
| } |
| |
| public int selectNow() throws IOException { |
| return lockAndDoSelect(0); |
| } |
| |
| public void implCloseSelector() throws IOException { |
| wakeup(); |
| synchronized (this) { |
| synchronized (publicKeys) { |
| synchronized (publicSelectedKeys) { |
| implClose(); |
| } |
| } |
| } |
| } |
| |
| protected abstract void implClose() throws IOException; |
| |
| void putEventOps(SelectionKeyImpl sk, int ops) { } |
| |
| protected final SelectionKey register(AbstractSelectableChannel ch, |
| int ops, |
| Object attachment) |
| { |
| if (!(ch instanceof SelChImpl)) |
| throw new IllegalSelectorException(); |
| SelectionKeyImpl k = new SelectionKeyImpl((SelChImpl)ch, this); |
| k.attach(attachment); |
| synchronized (publicKeys) { |
| implRegister(k); |
| } |
| k.interestOps(ops); |
| return k; |
| } |
| |
| protected abstract void implRegister(SelectionKeyImpl ski); |
| |
| void processDeregisterQueue() throws IOException { |
| // Precondition: Synchronized on this, keys, and selectedKeys |
| Set cks = cancelledKeys(); |
| synchronized (cks) { |
| if (!cks.isEmpty()) { |
| Iterator i = cks.iterator(); |
| while (i.hasNext()) { |
| SelectionKeyImpl ski = (SelectionKeyImpl)i.next(); |
| try { |
| implDereg(ski); |
| } catch (SocketException se) { |
| IOException ioe = new IOException( |
| "Error deregistering key"); |
| ioe.initCause(se); |
| throw ioe; |
| } finally { |
| i.remove(); |
| } |
| } |
| } |
| } |
| } |
| |
| protected abstract void implDereg(SelectionKeyImpl ski) throws IOException; |
| |
| abstract public Selector wakeup(); |
| |
| } |