server/XMLReader/UDPReader.java

import java.io.*;
import java.net.*;
import java.util.*;

// This class contains the main method to be run by
// the filter children.  It harvests UDP traffic.
//
//
public class UDPReader extends Thread{

    // It is normal to use this constructor in preference
    // to any other in this class.
    public UDPReader(int port, Logger logger){
        this.logger = logger;
        this.port = port;
    }
    
    public UDPReader(Logger logger){
        this(4589, logger);
    }

    public void run() {

        DatagramSocket socket = null;
        try {
            socket = new DatagramSocket(port);
        }
        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.");
            return;
        }
        catch (Exception e){
            System.out.println("An exception occured while creating the DatagramSocket.");
            return;
        }
        
        System.out.println("UDPReader ready and listening for UDP packets on port "+port);

        byte[] buf;
        UDPReaderThread t = new UDPReaderThread();
        
        boolean running = true;
        while (running){
            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();
    }
    
    
    Logger logger;
    int port;
    
    final int packetSizeLimit = 8192;
    
}
Revision:	1.6
Committed:	Tue Nov 21 09:15:06 2000 UTC (23 years, 11 months ago) by pjm2
Branch:	MAIN
Changes since 1.5:	+25 -18 lines
Log Message:	Modified the UDPReader class to accept a Logger and port number as a constructor argument (as opposed to command line parameters). The main method has been replaced with a run() method so that the gubbins of this program can be run as a thread from a Filter class.
#	User	Rev	Content
1	pjm2	1.1	import java.io.*;
2			import java.net.*;
3			import java.util.*;
4
5			// This class contains the main method to be run by
6	pjm2	1.6	// the filter children. It harvests UDP traffic.
7	pjm2	1.1	//
8			//
9	pjm2	1.6	public class UDPReader extends Thread{
10	pjm2	1.1
11	pjm2	1.6	// It is normal to use this constructor in preference
12			// to any other in this class.
13			public UDPReader(int port, Logger logger){
14			this.logger = logger;
15			this.port = port;
16			}
17
18			public UDPReader(Logger logger){
19			this(4589, logger);
20			}
21	pjm2	1.1
22	pjm2	1.6	public void run() {
23	pjm2	1.2
24	pjm2	1.3	DatagramSocket socket = null;
25			try {
26			socket = new DatagramSocket(port);
27			}
28			catch (BindException e){
29			System.out.println("Some other process is already listening on port "+port+".");
30			System.out.println("Please specify another port number on the command line.");
31	pjm2	1.6	return;
32			}
33			catch (Exception e){
34			System.out.println("An exception occured while creating the DatagramSocket.");
35			return;
36	pjm2	1.3	}
37
38	pjm2	1.2	System.out.println("UDPReader ready and listening for UDP packets on port "+port);
39
40	pjm2	1.4	byte[] buf;
41			UDPReaderThread t = new UDPReaderThread();
42
43	pjm2	1.2	boolean running = true;
44			while (running){
45			try {
46	pjm2	1.4	buf = new byte[packetSizeLimit];
47	pjm2	1.1	// receive request
48	pjm2	1.2	DatagramPacket packet = new DatagramPacket(buf, buf.length);
49			socket.receive(packet);
50	pjm2	1.4	t.run(packet);
51	pjm2	1.2	}
52			catch (IOException e) {
53			System.out.println("An exception occured in the UDPReader!");
54			e.printStackTrace();
55			}
56	pjm2	1.1	}
57			socket.close();
58			}
59	pjm2	1.6
60
61			Logger logger;
62			int port;
63
64			final int packetSizeLimit = 8192;
65
66	pjm2	1.1	}