/*
* Copyright 2012 The Netty Project
*
* The Netty Project licenses this file to you under the Apache License,
* version 2.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*/
package org.jboss.netty.channel.socket.nio;
import org.jboss.netty.channel.ChannelException;
import org.jboss.netty.channel.ChannelFactory;
import org.jboss.netty.channel.ChannelFuture;
import org.jboss.netty.channel.ChannelPipeline;
import org.jboss.netty.channel.ChannelSink;
import org.jboss.netty.channel.socket.DatagramChannelConfig;
import org.jboss.netty.channel.socket.InternetProtocolFamily;
import org.jboss.netty.util.internal.DetectionUtil;
import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.NetworkInterface;
import java.net.SocketAddress;
import java.net.SocketException;
import java.nio.channels.DatagramChannel;
import java.nio.channels.MembershipKey;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import static org.jboss.netty.channel.Channels.*;
/**
* Provides an NIO based {@link org.jboss.netty.channel.socket.DatagramChannel}.
*/
public class NioDatagramChannel extends AbstractNioChannel<DatagramChannel>
implements org.jboss.netty.channel.socket.DatagramChannel {
/**
* The {@link DatagramChannelConfig}.
*/
private final NioDatagramChannelConfig config;
private Map<InetAddress, List<MembershipKey>> memberships;
NioDatagramChannel(final ChannelFactory factory,
final ChannelPipeline pipeline, final ChannelSink sink,
final NioDatagramWorker worker, InternetProtocolFamily family) {
super(null, factory, pipeline, sink, worker, openNonBlockingChannel(family));
config = new DefaultNioDatagramChannelConfig(channel);
fireChannelOpen(this);
}
private static DatagramChannel openNonBlockingChannel(InternetProtocolFamily family) {
try {
final DatagramChannel channel;
// check if we are on java 7 or if the family was not specified
if (DetectionUtil.javaVersion() < 7 || family == null) {
channel = DatagramChannel.open();
} else {
// This block only works on java7++, but we checked before if we have it.
//
// Use the ProtocolFamilyConvert for conversion to prevent NoClassDefFoundError.
//
// See #368
switch (family) {
case IPv4:
channel = DatagramChannel.open(ProtocolFamilyConverter.convert(family));
break;
case IPv6:
channel = DatagramChannel.open(ProtocolFamilyConverter.convert(family));
break;
default:
throw new IllegalArgumentException();
}
}
channel.configureBlocking(false);
return channel;
} catch (final IOException e) {
throw new ChannelException("Failed to open a DatagramChannel.", e);
}
}
@Override
public NioDatagramWorker getWorker() {
return (NioDatagramWorker) super.getWorker();
}
public boolean isBound() {
return isOpen() && channel.socket().isBound();
}
public boolean isConnected() {
return channel.isConnected();
}
@Override
protected boolean setClosed() {
return super.setClosed();
}
@Override
public NioDatagramChannelConfig getConfig() {
return config;
}
DatagramChannel getDatagramChannel() {
return channel;
}
public ChannelFuture joinGroup(InetAddress multicastAddress) {
try {
return joinGroup(
multicastAddress, NetworkInterface.getByInetAddress(getLocalAddress().getAddress()), null);
} catch (SocketException e) {
return failedFuture(this, e);
}
}
public ChannelFuture joinGroup(InetSocketAddress multicastAddress, NetworkInterface networkInterface) {
return joinGroup(multicastAddress.getAddress(), networkInterface, null);
}
/**
* Joins the specified multicast group at the specified interface using the specified source.
*/
public ChannelFuture joinGroup(
InetAddress multicastAddress, NetworkInterface networkInterface, InetAddress source) {
if (DetectionUtil.javaVersion() < 7) {
throw new UnsupportedOperationException();
}
if (multicastAddress == null) {
throw new NullPointerException("multicastAddress");
}
if (networkInterface == null) {
throw new NullPointerException("networkInterface");
}
try {
MembershipKey key;
if (source == null) {
key = channel.join(multicastAddress, networkInterface);
} else {
key = channel.join(multicastAddress, networkInterface, source);
}
synchronized (this) {
if (memberships == null) {
memberships = new HashMap<InetAddress, List<MembershipKey>>();
}
List<MembershipKey> keys = memberships.get(multicastAddress);
if (keys == null) {
keys = new ArrayList<MembershipKey>();
memberships.put(multicastAddress, keys);
}
keys.add(key);
}
} catch (Throwable e) {
return failedFuture(this, e);
}
return succeededFuture(this);
}
public ChannelFuture leaveGroup(InetAddress multicastAddress) {
try {
return leaveGroup(
multicastAddress, NetworkInterface.getByInetAddress(getLocalAddress().getAddress()), null);
} catch (SocketException e) {
return failedFuture(this, e);
}
}
public ChannelFuture leaveGroup(InetSocketAddress multicastAddress,
NetworkInterface networkInterface) {
return leaveGroup(multicastAddress.getAddress(), networkInterface, null);
}
/**
* Leave the specified multicast group at the specified interface using the specified source.
*/
public ChannelFuture leaveGroup(InetAddress multicastAddress,
NetworkInterface networkInterface, InetAddress source) {
if (DetectionUtil.javaVersion() < 7) {
throw new UnsupportedOperationException();
} else {
if (multicastAddress == null) {
throw new NullPointerException("multicastAddress");
}
if (networkInterface == null) {
throw new NullPointerException("networkInterface");
}
synchronized (this) {
if (memberships != null) {
List<MembershipKey> keys = memberships.get(multicastAddress);
if (keys != null) {
Iterator<MembershipKey> keyIt = keys.iterator();
while (keyIt.hasNext()) {
MembershipKey key = keyIt.next();
if (networkInterface.equals(key.networkInterface())) {
if (source == null && key.sourceAddress() == null ||
source != null && source.equals(key.sourceAddress())) {
key.drop();
keyIt.remove();
}
}
}
if (keys.isEmpty()) {
memberships.remove(multicastAddress);
}
}
}
}
return succeededFuture(this);
}
}
/**
* Block the given sourceToBlock address for the given multicastAddress on the given networkInterface
*
*/
public ChannelFuture block(InetAddress multicastAddress,
NetworkInterface networkInterface, InetAddress sourceToBlock) {
if (DetectionUtil.javaVersion() < 7) {
throw new UnsupportedOperationException();
} else {
if (multicastAddress == null) {
throw new NullPointerException("multicastAddress");
}
if (sourceToBlock == null) {
throw new NullPointerException("sourceToBlock");
}
if (networkInterface == null) {
throw new NullPointerException("networkInterface");
}
synchronized (this) {
if (memberships != null) {
List<MembershipKey> keys = memberships.get(multicastAddress);
for (MembershipKey key: keys) {
if (networkInterface.equals(key.networkInterface())) {
try {
key.block(sourceToBlock);
} catch (IOException e) {
return failedFuture(this, e);
}
}
}
}
}
return succeededFuture(this);
}
}
/**
* Block the given sourceToBlock address for the given multicastAddress
*
*/
public ChannelFuture block(InetAddress multicastAddress, InetAddress sourceToBlock) {
try {
block(multicastAddress, NetworkInterface.getByInetAddress(getLocalAddress().getAddress()), sourceToBlock);
} catch (SocketException e) {
return failedFuture(this, e);
}
return succeededFuture(this);
}
@Override
InetSocketAddress getLocalSocketAddress() throws Exception {
return (InetSocketAddress) channel.socket().getLocalSocketAddress();
}
@Override
InetSocketAddress getRemoteSocketAddress() throws Exception {
return (InetSocketAddress) channel.socket().getRemoteSocketAddress();
}
@Override
public ChannelFuture write(Object message, SocketAddress remoteAddress) {
if (remoteAddress == null || remoteAddress.equals(getRemoteAddress())) {
return super.write(message, null);
} else {
return super.write(message, remoteAddress);
}
}
}