/*
* 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.catalina.ha.backend;
import java.net.DatagramPacket;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.MulticastSocket;
import java.nio.charset.StandardCharsets;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import org.apache.tomcat.util.res.StringManager;
/**
* Sender to proxies using multicast socket.
*/
public class MultiCastSender implements Sender {
private static final Log log = LogFactory.getLog(HeartbeatListener.class);
private static final StringManager sm = StringManager.getManager(MultiCastSender.class);
HeartbeatListener config = null;
/* for multicasting stuff */
MulticastSocket s = null;
InetAddress group = null;
@Override
public void init(HeartbeatListener config) throws Exception {
this.config = config;
}
@Override
public int send(String mess) throws Exception {
if (s == null) {
try {
group = InetAddress.getByName(config.getGroup());
if (config.getHost() != null) {
InetAddress addr = InetAddress.getByName(config.getHost());
InetSocketAddress addrs = new InetSocketAddress(addr, config.getMultiport());
s = new MulticastSocket(addrs);
} else {
s = new MulticastSocket(config.getMultiport());
}
s.setTimeToLive(config.getTtl());
s.joinGroup(new InetSocketAddress(group, 0), null);
} catch (Exception e) {
log.error(sm.getString("multiCastSender.multiCastFailed"), e);
s = null;
return -1;
}
}
byte[] buf;
buf = mess.getBytes(StandardCharsets.US_ASCII);
DatagramPacket data = new DatagramPacket(buf, buf.length, group, config.getMultiport());
try {
s.send(data);
} catch (Exception e) {
log.error(sm.getString("multiCastSender.sendFailed"), e);
s.close();
s = null;
return -1;
}
return 0;
}
}