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/*
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* Copyright 2000-2004 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package sun.nio.ch;
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import java.io.IOException;
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import java.nio.channels.*;
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import java.nio.channels.spi.*;
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import java.net.SocketException;
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import java.util.*;
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import sun.misc.*;
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/**
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* Base Selector implementation class.
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*/
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abstract class SelectorImpl
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extends AbstractSelector
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{
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// The set of keys with data ready for an operation
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protected Set selectedKeys;
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// The set of keys registered with this Selector
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protected HashSet keys;
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// Public views of the key sets
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private Set publicKeys; // Immutable
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private Set publicSelectedKeys; // Removal allowed, but not addition
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protected SelectorImpl(SelectorProvider sp) {
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super(sp);
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keys = new HashSet();
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selectedKeys = new HashSet();
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if (Util.atBugLevel("1.4")) {
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publicKeys = keys;
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publicSelectedKeys = selectedKeys;
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} else {
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publicKeys = Collections.unmodifiableSet(keys);
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publicSelectedKeys = Util.ungrowableSet(selectedKeys);
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}
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}
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public Set keys() {
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if (!isOpen() && !Util.atBugLevel("1.4"))
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throw new ClosedSelectorException();
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return publicKeys;
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}
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public Set selectedKeys() {
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if (!isOpen() && !Util.atBugLevel("1.4"))
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throw new ClosedSelectorException();
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return publicSelectedKeys;
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}
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protected abstract int doSelect(long timeout) throws IOException;
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private int lockAndDoSelect(long timeout) throws IOException {
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synchronized (this) {
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if (!isOpen())
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throw new ClosedSelectorException();
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synchronized (publicKeys) {
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synchronized (publicSelectedKeys) {
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return doSelect(timeout);
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}
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}
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}
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}
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public int select(long timeout)
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throws IOException
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{
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if (timeout < 0)
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throw new IllegalArgumentException("Negative timeout");
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return lockAndDoSelect((timeout == 0) ? -1 : timeout);
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}
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public int select() throws IOException {
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return select(0);
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}
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public int selectNow() throws IOException {
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return lockAndDoSelect(0);
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}
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public void implCloseSelector() throws IOException {
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wakeup();
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synchronized (this) {
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synchronized (publicKeys) {
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synchronized (publicSelectedKeys) {
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implClose();
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}
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}
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}
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}
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protected abstract void implClose() throws IOException;
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void putEventOps(SelectionKeyImpl sk, int ops) { }
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protected final SelectionKey register(AbstractSelectableChannel ch,
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int ops,
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Object attachment)
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{
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if (!(ch instanceof SelChImpl))
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throw new IllegalSelectorException();
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SelectionKeyImpl k = new SelectionKeyImpl((SelChImpl)ch, this);
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k.attach(attachment);
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synchronized (publicKeys) {
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implRegister(k);
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}
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k.interestOps(ops);
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return k;
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}
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protected abstract void implRegister(SelectionKeyImpl ski);
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void processDeregisterQueue() throws IOException {
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// Precondition: Synchronized on this, keys, and selectedKeys
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Set cks = cancelledKeys();
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synchronized (cks) {
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Iterator i = cks.iterator();
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while (i.hasNext()) {
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SelectionKeyImpl ski = (SelectionKeyImpl)i.next();
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try {
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implDereg(ski);
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} catch (SocketException se) {
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IOException ioe = new IOException(
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"Error deregistering key");
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ioe.initCause(se);
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throw ioe;
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} finally {
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i.remove();
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}
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}
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}
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}
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protected abstract void implDereg(SelectionKeyImpl ski) throws IOException;
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abstract public Selector wakeup();
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}
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