--- experimental/server/XMLReader/UDPReader.java	2000/11/17 11:23:19	1.1
+++ experimental/server/XMLReader/UDPReader.java	2000/11/17 20:44:31	1.4
@@ -10,19 +10,50 @@ public class UDPReader {
 
     public static void main(String[] args) throws IOException {
 
-        DatagramSocket socket = new DatagramSocket(4589);
+        // default UDP listening port.
+        int port = 4589;
+        final int packetSizeLimit = 8192;
 
+        // Allow the user to choose their own port number.
+        if (args.length == 1){
+            try {
+                port = new Integer(args[0]).intValue();
+            }
+            catch (Exception e){
+                // If something went wrong, use the default again.
+                port = 4589;
+            }
+        }
+
+        DatagramSocket socket = null;
         try {
-            byte[] buf = new byte[1024];
-                // receive request
-            DatagramPacket packet = new DatagramPacket(buf, buf.length);
-            socket.receive(packet);
-            String dataIn = new String(packet.getData());
-            System.out.println("Received: " + dataIn);
+            socket = new DatagramSocket(port);
         }
-        catch (IOException e) {
-            System.out.println("An exception occured!");
-            e.printStackTrace();
+        catch (BindException e){
+            System.out.println("Some other process is already listening on port "+port+".");
+            System.out.println("Please specify another port number on the command line.");
+            System.exit(0);
+        }
+        
+        System.out.println("UDPReader ready and listening for UDP packets on port "+port);
+
+        byte[] buf;
+        UDPReaderThread t = new UDPReaderThread();
+        
+        boolean running = true;
+        while (running){
+            System.gc();
+            try {
+                buf = new byte[packetSizeLimit];
+                // receive request
+                DatagramPacket packet = new DatagramPacket(buf, buf.length);
+                socket.receive(packet);
+                t.run(packet);
+            }
+            catch (IOException e) {
+                System.out.println("An exception occured in the UDPReader!");
+                e.printStackTrace();
+            }
         }
         socket.close();
     }