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// $Id$
// ============================================================================
//
//
// = FILENAME
// NS_Resolve.java
//
// = AUTHOR
// Michael Kircher (mk1@cs.wustl.edu)
//
// = DESCRIPTION
// Resolves the initial reference to the Naming service,
// the orb has to be given as a parameter to the
// resolve_name_service call.
//
//
// ============================================================================
import CosTrading.*;
import org.omg.CORBA.*;
import java.net.*;
import java.io.*;
public class TS_Resolve
{
private static final String ACE_DEFAULT_MULTICAST_ADDR = "224.9.9.2";
private static final int TAO_DEFAULT_NAME_SERVER_REQUEST_PORT = 10016;
private static final int MULTICAST_SEND_PORT = 10060;
private static final int MULTICAST_RECEIVE_PORT = 10061;
private static final int TAO_SERVICEID_NAMESERVICE = 0;
private static final int TAO_SERVICEID_TRADINGSERVICE = 1;
static public CosTrading.Lookup
resolve_trading_service (org.omg.CORBA.ORB orb)
{
try
{
// Create a message with the multicast receive port in it
ByteArrayOutputStream byte_stream_ = new ByteArrayOutputStream ();
byte_stream_.write ((int)((MULTICAST_RECEIVE_PORT&0xff00)>>>8));
byte_stream_.write ((int)(MULTICAST_RECEIVE_PORT&0x00ff));
byte_stream_.write ((int)((TAO_SERVICEID_TRADINGSERVICE&0xff00)>>>8));
byte_stream_.write ((int)(TAO_SERVICEID_TRADINGSERVICE&0x00ff));
byte[] msg = byte_stream_.toByteArray();
// Define the group for the multicast
InetAddress group = InetAddress.getByName(ACE_DEFAULT_MULTICAST_ADDR);
// Create the multicast socket at any port you want
MulticastSocket multicastsocket = new MulticastSocket(MULTICAST_SEND_PORT);
// Create a socket for the answer of the Naming Service
DatagramSocket socket = new DatagramSocket (MULTICAST_RECEIVE_PORT);
// Give three seconds time for the Naming Service to respond
socket.setSoTimeout (3000);
// Build a packet with the port number in it
DatagramPacket hello = new DatagramPacket(msg, msg.length,
group, TAO_DEFAULT_NAME_SERVER_REQUEST_PORT);
// Send the packet
multicastsocket.send (hello);
// @@ The restriction right now is that the length of the IOR cannot be longer than 4096
byte[] buf = new byte[4096];
// Set up packet which can be received
DatagramPacket recv = new DatagramPacket (buf, buf.length);
// Receive a packet or time out
socket.receive (recv);
// Determine the length of the IOR
int length;
for (length = 0; buf[length] != 0; length++);
// Store the IOR in a String
String name_service_ior = new String (recv.getData (),0,length);
// Convert the String into
org.omg.CORBA.Object obj = orb.string_to_object (name_service_ior);
return CosTrading.LookupHelper.narrow (obj);
}
catch (SocketException e)
{
System.err.println (e);
}
catch (java.io.InterruptedIOException e)
{
System.err.println ("TS_Resolve: The receive lasted too long");
}
catch(org.omg.CORBA.SystemException e)
{
System.err.println(e);
}
catch (java.io.IOException e)
{
System.err.println (e);
}
return null;
}
};
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