/*
* Copyright 1999-2011 Alibaba Group.
*
* 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.alibaba.dubbo.registry.multicast;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.MulticastSocket;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import com.alibaba.dubbo.common.Constants;
import com.alibaba.dubbo.common.URL;
import com.alibaba.dubbo.common.logger.Logger;
import com.alibaba.dubbo.common.logger.LoggerFactory;
import com.alibaba.dubbo.common.utils.ConcurrentHashSet;
import com.alibaba.dubbo.common.utils.NetUtils;
import com.alibaba.dubbo.common.utils.StringUtils;
import com.alibaba.dubbo.common.utils.UrlUtils;
import com.alibaba.dubbo.registry.NotifyListener;
import com.alibaba.dubbo.registry.support.FailbackRegistry;
/**
* MulticastRegistry
*
* @author william.liangf
*/
public class MulticastRegistry extends FailbackRegistry {
// 日志输出
private static final Logger logger = LoggerFactory.getLogger(MulticastRegistry.class);
private static final int DEFAULT_MULTICAST_PORT = 1234;
private static final String REGISTER = "register";
private static final String UNREGISTER = "unregister";
private static final String SUBSCRIBE = "subscribe";
private static final String UNSUBSCRIBE = "unsubscribe";
private final InetAddress mutilcastAddress;
private final MulticastSocket mutilcastSocket;
private final ConcurrentMap<String, Set<String>> notified = new ConcurrentHashMap<String, Set<String>>();
public MulticastRegistry(URL url) {
super(url);
if (! isMulticastAddress(url.getHost())) {
throw new IllegalArgumentException("Invalid multicast address " + url.getHost() + ", scope: 224.0.0.0 - 239.255.255.255");
}
try {
mutilcastAddress = InetAddress.getByName(url.getHost());
mutilcastSocket = new MulticastSocket(url.getPort() == 0 ? DEFAULT_MULTICAST_PORT : url.getPort());
mutilcastSocket.setLoopbackMode(false);
mutilcastSocket.joinGroup(mutilcastAddress);
Thread thread = new Thread(new Runnable() {
public void run() {
byte[] buf = new byte[2048];
DatagramPacket recv = new DatagramPacket(buf, buf.length);
while (! mutilcastSocket.isClosed()) {
try {
mutilcastSocket.receive(recv);
String msg = new String(recv.getData()).trim();
int i = msg.indexOf('\n');
if (i > 0) {
msg = msg.substring(0, i).trim();
}
MulticastRegistry.this.receive(msg, (InetSocketAddress) recv.getSocketAddress());
Arrays.fill(buf, (byte)0);
} catch (IOException e) {
if (! mutilcastSocket.isClosed()) {
logger.error(e.getMessage(), e);
}
}
}
}
}, "DubboMulticastRegistryReceiver");
thread.setDaemon(true);
thread.start();
} catch (IOException e) {
throw new IllegalStateException(e.getMessage(), e);
}
}
private static boolean isMulticastAddress(String ip) {
int i = ip.indexOf('.');
if (i > 0) {
String prefix = ip.substring(0, i);
if (StringUtils.isInteger(prefix)) {
int p = Integer.parseInt(prefix);
return p >= 224 && p <= 239;
}
}
return false;
}
private void receive(String msg, InetSocketAddress remoteAddress) {
if (logger.isInfoEnabled()) {
logger.info("Receive multicast message: " + msg + " from " + remoteAddress);
}
if (msg.startsWith(REGISTER)) {
URL url = URL.valueOf(msg.substring(REGISTER.length()).trim());
registered(url);
} else if (msg.startsWith(UNREGISTER)) {
URL url = URL.valueOf(msg.substring(UNREGISTER.length()).trim());
unregistered(url);
} else if (msg.startsWith(SUBSCRIBE)) {
URL url = URL.valueOf(msg.substring(SUBSCRIBE.length()).trim());
List<URL> urls = lookup(url);
if (urls != null && urls.size() > 0) {
for (URL u : urls) {
String host = remoteAddress != null && remoteAddress.getAddress() != null
? remoteAddress.getAddress().getHostAddress() : url.getIp();
if (url.getParameter("unicast", true) // 消费者的机器是否只有一个进程
&& ! NetUtils.getLocalHost().equals(host)) { // 同机器多进程不能用unicast单播信息，否则只会有一个进程收到信息
unicast(REGISTER + " " + u.toFullString(), host);
} else {
broadcast(REGISTER + " " + u.toFullString());
}
}
}
}/* else if (msg.startsWith(UNSUBSCRIBE)) {
}*/
}
private void broadcast(String msg) {
if (logger.isInfoEnabled()) {
logger.info("Send broadcast message: " + msg + " to " + mutilcastAddress + ":" + mutilcastSocket.getLocalPort());
}
try {
byte[] data = (msg + "\n").getBytes();
DatagramPacket hi = new DatagramPacket(data, data.length, mutilcastAddress, mutilcastSocket.getLocalPort());
mutilcastSocket.send(hi);
} catch (Exception e) {
throw new IllegalStateException(e.getMessage(), e);
}
}
private void unicast(String msg, String host) {
if (logger.isInfoEnabled()) {
logger.info("Send unicast message: " + msg + " to " + host + ":" + mutilcastSocket.getLocalPort());
}
try {
byte[] data = (msg + "\n").getBytes();
DatagramPacket hi = new DatagramPacket(data, data.length, InetAddress.getByName(host), mutilcastSocket.getLocalPort());
mutilcastSocket.send(hi);
} catch (Exception e) {
throw new IllegalStateException(e.getMessage(), e);
}
}
protected void doRegister(URL url) {
broadcast(REGISTER + " " + url.toFullString());
}
protected void doUnregister(URL url) {
broadcast(UNREGISTER + " " + url.toFullString());
}
protected void doSubscribe(URL url, NotifyListener listener) {
if (! Constants.ANY_VALUE.equals(url.getServiceName())
&& url.getParameter(Constants.REGISTER_KEY, true)) {
register(url);
}
broadcast(SUBSCRIBE + " " + url.toFullString());
synchronized (listener) {
try {
listener.wait(url.getParameter(Constants.TIMEOUT_KEY, Constants.DEFAULT_TIMEOUT));
} catch (InterruptedException e) {
}
}
}
protected void doUnsubscribe(URL url, NotifyListener listener) {
if (! Constants.ANY_VALUE.equals(url.getServiceName())
&& url.getParameter(Constants.REGISTER_KEY, true)) {
unregister(url);
}
broadcast(UNSUBSCRIBE + " " + url.toFullString());
}
public boolean isAvailable() {
try {
return mutilcastSocket != null;
} catch (Throwable t) {
return false;
}
}
public void destroy() {
super.destroy();
try {
mutilcastSocket.leaveGroup(mutilcastAddress);
mutilcastSocket.close();
} catch (Throwable t) {
logger.warn(t.getMessage(), t);
}
}
protected void registered(URL url) {
for (Map.Entry<String, Set<NotifyListener>> entry : getSubscribed().entrySet()) {
String key = entry.getKey();
URL subscribe = URL.valueOf(key);
if (UrlUtils.isMatch(subscribe, url)) {
Set<String> urls = notified.get(key);
if (urls == null) {
notified.putIfAbsent(key, new ConcurrentHashSet<String>());
urls = notified.get(key);
}
urls.add(url.toFullString());
List<URL> list = toList(urls);
if (list != null && list.size() > 0) {
for (NotifyListener listener : entry.getValue()) {
notify(subscribe, listener, list);
synchronized (listener) {
listener.notify();
}
}
}
}
}
}
protected void unregistered(URL url) {
for (Map.Entry<String, Set<NotifyListener>> entry : getSubscribed().entrySet()) {
String key = entry.getKey();
URL subscribe = URL.valueOf(key);
if (UrlUtils.isMatch(subscribe, url)) {
Set<String> urls = notified.get(key);
if (urls != null) {
urls.remove(url.toFullString());
}
List<URL> list = toList(urls);
if (list != null && list.size() > 0) {
for (NotifyListener listener : entry.getValue()) {
notify(subscribe, listener, list);
}
}
}
}
}
protected void subscribed(URL url, NotifyListener listener) {
List<URL> urls = lookup(url);
if (urls != null && urls.size() > 0) {
notify(url, listener, urls);
}
}
private List<URL> toList(Set<String> urls) {
List<URL> list = new ArrayList<URL>();
if (urls != null && urls.size() > 0) {
for (String url : urls) {
list.add(URL.valueOf(url));
}
}
return list;
}
public void register(URL url) {
super.register(url);
registered(url);
}
public void unregister(URL url) {
super.unregister(url);
unregistered(url);
}
public void subscribe(URL url, NotifyListener listener) {
super.subscribe(url, listener);
subscribed(url, listener);
}
public void unsubscribe(URL url, NotifyListener listener) {
super.unsubscribe(url, listener);
notified.remove(url.toFullString());
}
public Map<String, Set<String>> getNotified() {
return notified;
}
public MulticastSocket getMutilcastSocket() {
return mutilcastSocket;
}
}