public void identify() {
long end, begin = System.currentTimeMillis();
end = begin;
System.out.println(
"Listening for multicast messages from nodes on the network for 1 second...");
while ((end - begin) < 1000) {
try {
byte buffer[] = new byte[mcsocket.getReceiveBufferSize()];
DatagramPacket packet = new DatagramPacket(buffer, buffer.length);
mcsocket.receive(packet);
nodes.put(
XmlDecoder.XmlDecodeMulticastMessageId(new String(packet.getData())),
XmlDecoder.XmlDecodeMulticastMessageAddress(new String(packet.getData())));
} catch (SocketTimeoutException e1) {
System.out.println("No multicast messages received");
} catch (IOException e) {
System.out.println("Problem identifying node in network");
e.printStackTrace();
}
end = System.currentTimeMillis();
}
assignId();
}
String dumpSocketInfo() throws Exception {
StringBuffer sb = new StringBuffer();
sb.append("local_addr=").append(local_addr);
sb.append(", mcast_addr=").append(mcast_addr);
sb.append(", bind_addr=").append(bind_addr);
sb.append(", ttl=").append(ip_ttl);
if (sock != null) {
sb.append("\nsocket: bound to ");
sb.append(sock.getLocalAddress().getHostAddress()).append(":").append(sock.getLocalPort());
sb.append(", receive buffer size=").append(sock.getReceiveBufferSize());
sb.append(", send buffer size=").append(sock.getSendBufferSize());
}
if (mcast_sock != null) {
sb.append("\nmulticast socket: bound to ");
sb.append(mcast_sock.getInterface().getHostAddress())
.append(":")
.append(mcast_sock.getLocalPort());
sb.append(", send buffer size=").append(mcast_sock.getSendBufferSize());
sb.append(", receive buffer size=").append(mcast_sock.getReceiveBufferSize());
}
return sb.toString();
}