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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF 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.apache.dubbo.remoting.p2p.support;
import org.apache.dubbo.common.URL;
import org.apache.dubbo.common.utils.NetUtils;
import org.apache.dubbo.remoting.ChannelHandler;
import org.apache.dubbo.remoting.RemotingException;
import org.apache.dubbo.remoting.p2p.Peer;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.MulticastSocket;
/**
* MulticastGroup
*/
public class MulticastGroup extends AbstractGroup {
private static final String JOIN = "join";
private static final String LEAVE = "leave";
private InetAddress multicastAddress;
private MulticastSocket multicastSocket;
public MulticastGroup(URL url) {
super(url);
if (!NetUtils.isMulticastAddress(url.getHost())) {
throw new IllegalArgumentException("Invalid multicast address " + url.getHost() + ", scope: 224.0.0.0 - 239.255.255.255");
}
try {
multicastAddress = InetAddress.getByName(url.getHost());
multicastSocket = new MulticastSocket(url.getPort());
multicastSocket.setLoopbackMode(false);
multicastSocket.joinGroup(multicastAddress);
Thread thread = new Thread(new Runnable() {
@Override
public void run() {
byte[] buf = new byte[1024];
DatagramPacket recv = new DatagramPacket(buf, buf.length);
while (true) {
try {
multicastSocket.receive(recv);
MulticastGroup.this.receive(new String(recv.getData()).trim(), (InetSocketAddress) recv.getSocketAddress());
} catch (Exception e) {
logger.error(e.getMessage(), e);
}
}
}
}, "MulticastGroupReceiver");
thread.setDaemon(true);
thread.start();
} catch (IOException e) {
throw new IllegalStateException(e.getMessage(), e);
}
}
private void send(String msg) throws RemotingException {
DatagramPacket hi = new DatagramPacket(msg.getBytes(), msg.length(), multicastAddress, multicastSocket.getLocalPort());
try {
multicastSocket.send(hi);
} catch (IOException e) {
throw new IllegalStateException(e.getMessage(), e);
}
}
private void receive(String msg, InetSocketAddress remoteAddress) throws RemotingException {
if (msg.startsWith(JOIN)) {
String url = msg.substring(JOIN.length()).trim();
connect(URL.valueOf(url));
} else if (msg.startsWith(LEAVE)) {
String url = msg.substring(LEAVE.length()).trim();
disconnect(URL.valueOf(url));
}
}
@Override
public Peer join(URL url, ChannelHandler handler) throws RemotingException {
Peer peer = super.join(url, handler);
send(JOIN + " " + url.toFullString());
return peer;
}
@Override
public void leave(URL url) throws RemotingException {
super.leave(url);
send(LEAVE + " " + url.toFullString());
}
}