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package derms.replica2;
import java.io.IOException;
import java.net.*;
import java.util.logging.Logger;
class Announcer implements Runnable {
static final long intervalMillis = 3000;
private SocketAddress group;
private InetAddress localAddr;
private City city;
private Logger log;
Announcer(SocketAddress group, InetAddress localAddr, City city) throws IOException {
this.group = group;
this.localAddr = localAddr;
this.city = city;
this.log = DermsLogger.getLogger(this.getClass());
}
@Override
public void run() {
NetworkInterface netInterface = null;
try {
netInterface = NetworkInterface.getByInetAddress(localAddr);
if (netInterface == null) {
throw new Exception("netInterface is null");
}
} catch (Exception e) {
log.severe("Failed to get network interface bound to "+localAddr.toString()+": "+e.getMessage());
return;
}
MulticastSocket sock = null;
try {
sock = new MulticastSocket();
sock.joinGroup(group, netInterface);
} catch (Exception e) {
log.severe("Failed to open multicast socket: "+e.getMessage());
return;
}
log.info("Announcing from "+localAddr.toString()+" ("+netInterface.getName()+") to "+group.toString());
DatagramPacket pkt = null;
try {
pkt = ObjectPacket.create(city, group);
} catch (IOException e) {
log.severe("Failed to create packet: "+e.getMessage());
sock.close();
return;
}
try {
for (;;) {
sock.send(pkt);
Thread.sleep(intervalMillis);
}
} catch (IOException e) {
log.severe("Failed to send to multicast socket "+group.toString()+": "+e.getMessage());
} catch (InterruptedException e) {
log.info("Interrupted.");
} finally {
log.info("Shutting down...");
sock.close();
}
}
}
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