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Multicast.java
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Multicast.java
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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.servicecomb.zeroconfig.multicast;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.MulticastSocket;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.util.concurrent.TimeUnit;
import org.apache.servicecomb.registry.lightweight.Message;
import org.apache.servicecomb.registry.lightweight.MessageType;
import org.apache.servicecomb.zeroconfig.Config;
import org.apache.servicecomb.zeroconfig.ZeroConfigConst;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
import com.google.common.net.HostAndPort;
@Component
//@Conditional(ConditionOnMulticast.class)
public class Multicast {
private static final Logger LOGGER = LoggerFactory.getLogger(Multicast.class);
private final InetSocketAddress bindAddress;
// (224.0.0.0, 239.255.255.255]
private final InetAddress group;
private final MulticastSocket multicastSocket;
private final byte[] recvBuffer = new byte[ZeroConfigConst.MAX_PACKET_SIZE];
private final DatagramPacket recvPacket = new DatagramPacket(recvBuffer, recvBuffer.length);
public Multicast(Config config) throws IOException {
this.bindAddress = initBindAddress(config);
this.group = initGroup(config);
LOGGER.info("zero config, address: {}", bindAddress);
LOGGER.info("zero config, group: {}", group);
// delete after support @Conditional
if (!config.isMulticast()) {
multicastSocket = null;
return;
}
this.multicastSocket = new MulticastSocket(bindAddress);
this.multicastSocket.joinGroup(group);
this.multicastSocket.setSoTimeout((int) TimeUnit.SECONDS.toMillis(5));
}
public Multicast setSendBufferSize(int size) throws SocketException {
multicastSocket.setSendBufferSize(size);
return this;
}
public Multicast setReceiveBufferSize(int size) throws SocketException {
multicastSocket.setReceiveBufferSize(size);
return this;
}
@SuppressWarnings("UnstableApiUsage")
private InetSocketAddress initBindAddress(Config config) {
HostAndPort hostAndPort = HostAndPort.fromString(config.getMulticastAddress());
return new InetSocketAddress(hostAndPort.getHost(), hostAndPort.getPort());
}
private InetAddress initGroup(Config config) throws UnknownHostException {
return InetAddress.getByName(config.getMulticastGroup());
}
public <T> void send(MessageType type, T body) throws IOException {
byte[] buffer = Message.of(type, body).encode();
DatagramPacket packet = new DatagramPacket(buffer, buffer.length, group, bindAddress.getPort());
multicastSocket.send(packet);
}
public Message<?> recv() throws IOException {
multicastSocket.receive(recvPacket);
return Message.decode(recvPacket.getData(), recvPacket.getLength());
}
}