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, 5 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.
#	Content
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	// the filter children. It harvests UDP traffic.
7	//
8	//
9	public class UDPReader extends Thread{
10
11	// 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
22	public void run() {
23
24	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	return;
32	}
33	catch (Exception e){
34	System.out.println("An exception occured while creating the DatagramSocket.");
35	return;
36	}
37
38	System.out.println("UDPReader ready and listening for UDP packets on port "+port);
39
40	byte[] buf;
41	UDPReaderThread t = new UDPReaderThread();
42
43	boolean running = true;
44	while (running){
45	try {
46	buf = new byte[packetSizeLimit];
47	// receive request
48	DatagramPacket packet = new DatagramPacket(buf, buf.length);
49	socket.receive(packet);
50	t.run(packet);
51	}
52	catch (IOException e) {
53	System.out.println("An exception occured in the UDPReader!");
54	e.printStackTrace();
55	}
56	}
57	socket.close();
58	}
59
60
61	Logger logger;
62	int port;
63
64	final int packetSizeLimit = 8192;
65
66	}