package ch.usi.da.paxos.lab;
/*
* Copyright (c) 2013 Università della Svizzera italiana (USI)
*
* This file is part of URingPaxos.
*
* URingPaxos is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* URingPaxos 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 for more details.
*
* You should have received a copy of the GNU General Public License
* along with URingPaxos. If not, see <http://www.gnu.org/licenses/>.
*/
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.NetworkInterface;
import java.net.SocketAddress;
import java.net.StandardProtocolFamily;
import java.net.StandardSocketOptions;
import java.nio.ByteBuffer;
import java.nio.channels.DatagramChannel;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.util.Iterator;
import java.util.Set;
import ch.usi.da.paxos.api.PaxosRole;
import ch.usi.da.paxos.message.Message;
import ch.usi.da.paxos.old.Configuration;
/**
* Name: MulticastListener<br>
* Description: <br>
*
* Creation date: Apr 10, 2012<br>
* $Id$
*
* @author Samuel Benz benz@geoid.ch
*/
public class MulticastListener implements Runnable {
private DatagramChannel channel;
private final String name;
private final Selector selector;
private ByteBuffer buffer = ByteBuffer.allocate(8192);
/**
* @param name
* @param channel
* @throws IOException
*/
public MulticastListener(String name,DatagramChannel channel) throws IOException{
//this.channel = channel;
this.name = name;
NetworkInterface i = NetworkInterface.getByName(Configuration.getInterface());
this.channel = DatagramChannel.open(StandardProtocolFamily.INET)
.setOption(StandardSocketOptions.SO_REUSEADDR, true)
.bind(Configuration.getGroup(PaxosRole.Acceptor))
.setOption(StandardSocketOptions.IP_MULTICAST_IF, i);
this.channel.configureBlocking(false);
this.channel.join(Configuration.getGroup(PaxosRole.Acceptor).getAddress(), i);
selector = Selector.open();
}
@Override
public void run() {
try {
channel.register(selector,SelectionKey.OP_READ);
while (selector.isOpen()){
selector.select(2000);
Set<SelectionKey> keys = selector.selectedKeys();
synchronized (keys){
Iterator<SelectionKey> it = keys.iterator();
while (it.hasNext()){
SelectionKey key = (SelectionKey)it.next();
it.remove();
if (!key.isValid())
continue;
if (key.isReadable()){
read(key);
}
}
}
}
} catch (IOException e) {
e.printStackTrace();
}
}
private void read(SelectionKey key){
DatagramChannel channel = (DatagramChannel)key.channel();
try{
buffer.clear();
SocketAddress address = channel.receive(buffer);
if (address == null)
return;
buffer.flip();
int count = buffer.remaining();
if (count > 0){
byte[] bytes = new byte[count];
buffer.get(bytes);
DatagramPacket in = new DatagramPacket(bytes, count, address);
Message m = Message.fromWire(in.getData());
if(m != null){
System.out.println(name + " receive: " + m);
}
}
selector.wakeup();
}catch (IOException e){
e.printStackTrace();
}
}
}