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/*
* Copyright (c) 2008, 2009, 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.nio.channels.*;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.io.IOException;
import java.util.HashSet;
/**
* MembershipKey implementation.
*/
class MembershipKeyImpl
extends MembershipKey
{
private final MulticastChannel ch;
private final InetAddress group;
private final NetworkInterface interf;
private final InetAddress source;
// true when key is valid
private volatile boolean valid = true;
// lock used when creating or accessing blockedSet
private Object stateLock = new Object();
// set of source addresses that are blocked
private HashSet<InetAddress> blockedSet;
private MembershipKeyImpl(MulticastChannel ch,
InetAddress group,
NetworkInterface interf,
InetAddress source)
{
this.ch = ch;
this.group = group;
this.interf = interf;
this.source = source;
}
/**
* MembershipKey will additional context for IPv4 membership
*/
static class Type4 extends MembershipKeyImpl {
private final int groupAddress;
private final int interfAddress;
private final int sourceAddress;
Type4(MulticastChannel ch,
InetAddress group,
NetworkInterface interf,
InetAddress source,
int groupAddress,
int interfAddress,
int sourceAddress)
{
super(ch, group, interf, source);
this.groupAddress = groupAddress;
this.interfAddress = interfAddress;
this.sourceAddress = sourceAddress;
}
int groupAddress() {
return groupAddress;
}
int interfaceAddress() {
return interfAddress;
}
int source() {
return sourceAddress;
}
}
/**
* MembershipKey will additional context for IPv6 membership
*/
static class Type6 extends MembershipKeyImpl {
private final byte[] groupAddress;
private final int index;
private final byte[] sourceAddress;
Type6(MulticastChannel ch,
InetAddress group,
NetworkInterface interf,
InetAddress source,
byte[] groupAddress,
int index,
byte[] sourceAddress)
{
super(ch, group, interf, source);
this.groupAddress = groupAddress;
this.index = index;
this.sourceAddress = sourceAddress;
}
byte[] groupAddress() {
return groupAddress;
}
int index() {
return index;
}
byte[] source() {
return sourceAddress;
}
}
public boolean isValid() {
return valid;
}
// package-private
void invalidate() {
valid = false;
}
public void drop() {
// delegate to channel
((DatagramChannelImpl)ch).drop(this);
}
@Override
public MulticastChannel channel() {
return ch;
}
@Override
public InetAddress group() {
return group;
}
@Override
public NetworkInterface networkInterface() {
return interf;
}
@Override
public InetAddress sourceAddress() {
return source;
}
@Override
public MembershipKey block(InetAddress toBlock)
throws IOException
{
if (source != null)
throw new IllegalStateException("key is source-specific");
synchronized (stateLock) {
if ((blockedSet != null) && blockedSet.contains(toBlock)) {
// already blocked, nothing to do
return this;
}
((DatagramChannelImpl)ch).block(this, toBlock);
// created blocked set if required and add source address
if (blockedSet == null)
blockedSet = new HashSet<InetAddress>();
blockedSet.add(toBlock);
}
return this;
}
@Override
public MembershipKey unblock(InetAddress toUnblock) {
synchronized (stateLock) {
if ((blockedSet == null) || !blockedSet.contains(toUnblock))
throw new IllegalStateException("not blocked");
((DatagramChannelImpl)ch).unblock(this, toUnblock);
blockedSet.remove(toUnblock);
}
return this;
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder(64);
sb.append('<');
sb.append(group.getHostAddress());
sb.append(',');
sb.append(interf.getName());
if (source != null) {
sb.append(',');
sb.append(source.getHostAddress());
}
sb.append('>');
return sb.toString();
}
}
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