/*
* Copyright 2012-2015, the original author or authors.
*
* Licensed 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 com.flipkart.phantom.netty.uds;
import org.jboss.netty.channel.*;
import org.jboss.netty.channel.socket.DatagramChannel;
import org.jboss.netty.channel.socket.DatagramChannelConfig;
import org.jboss.netty.channel.socket.DefaultDatagramChannelConfig;
import java.io.IOException;
import java.net.*;
import static org.jboss.netty.channel.Channels.fireChannelOpen;
/**
* Based on: org.jboss.netty.channel.socket.oio.OioDatagramChannel
* OIO package modified to work for Unix Domain Sockets instead of ServerSocket.
*
* @author devashishshankar
* @version 1.0, 19th April 2013
*/
final class OioDatagramChannel extends AbstractChannel
implements DatagramChannel {
final MulticastSocket socket;
final Object interestOpsLock = new Object();
private final DatagramChannelConfig config;
volatile Thread workerThread;
private volatile InetSocketAddress localAddress;
volatile InetSocketAddress remoteAddress;
OioDatagramChannel(
ChannelFactory factory,
ChannelPipeline pipeline,
ChannelSink sink) {
super(null, factory, pipeline, sink);
try {
socket = new MulticastSocket(null);
} catch (IOException e) {
throw new ChannelException("Failed to open a datagram socket.", e);
}
try {
socket.setSoTimeout(10);
socket.setBroadcast(false);
} catch (SocketException e) {
throw new ChannelException(
"Failed to configure the datagram socket timeout.", e);
}
config = new DefaultDatagramChannelConfig(socket);
fireChannelOpen(this);
}
public DatagramChannelConfig getConfig() {
return config;
}
public InetSocketAddress getLocalAddress() {
InetSocketAddress localAddress = this.localAddress;
if (localAddress == null) {
try {
this.localAddress = localAddress =
(InetSocketAddress) socket.getLocalSocketAddress();
} catch (Throwable t) {
// Sometimes fails on a closed socket in Windows.
return null;
}
}
return localAddress;
}
public InetSocketAddress getRemoteAddress() {
InetSocketAddress remoteAddress = this.remoteAddress;
if (remoteAddress == null) {
try {
this.remoteAddress = remoteAddress =
(InetSocketAddress) socket.getRemoteSocketAddress();
} catch (Throwable t) {
// Sometimes fails on a closed socket in Windows.
return null;
}
}
return remoteAddress;
}
public boolean isBound() {
return isOpen() && socket.isBound();
}
public boolean isConnected() {
return isOpen() && socket.isConnected();
}
@Override
protected boolean setClosed() {
return super.setClosed();
}
@Override
protected void setInterestOpsNow(int interestOps) {
super.setInterestOpsNow(interestOps);
}
@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);
}
}
public void joinGroup(InetAddress multicastAddress) {
ensureBound();
try {
socket.joinGroup(multicastAddress);
} catch (IOException e) {
throw new ChannelException(e);
}
}
public void joinGroup(
InetSocketAddress multicastAddress, NetworkInterface networkInterface) {
ensureBound();
try {
socket.joinGroup(multicastAddress, networkInterface);
} catch (IOException e) {
throw new ChannelException(e);
}
}
private void ensureBound() {
if (!isBound()) {
throw new IllegalStateException(
DatagramChannel.class.getName() +
" must be bound to join a group.");
}
}
public void leaveGroup(InetAddress multicastAddress) {
try {
socket.leaveGroup(multicastAddress);
} catch (IOException e) {
throw new ChannelException(e);
}
}
public void leaveGroup(
InetSocketAddress multicastAddress, NetworkInterface networkInterface) {
try {
socket.leaveGroup(multicastAddress, networkInterface);
} catch (IOException e) {
throw new ChannelException(e);
}
}
}