| 1 |
+ |
//---PACKAGE DECLARATION--- |
| 2 |
+ |
package uk.ac.ukc.iscream.filter; |
| 3 |
+ |
|
| 4 |
+ |
//---IMPORTS--- |
| 5 |
|
import java.io.*; |
| 6 |
|
import java.net.*; |
| 7 |
|
import java.util.*; |
| 8 |
+ |
import uk.ac.ukc.iscream.core.*; |
| 9 |
+ |
import uk.ac.ukc.iscream.filter.*; |
| 10 |
+ |
import uk.ac.ukc.iscream.util.*; |
| 11 |
|
|
| 12 |
< |
// This class contains the main method to be run by |
| 13 |
< |
// the filter children. It harvests UDP traffic. |
| 14 |
< |
// |
| 15 |
< |
// |
| 12 |
> |
/** |
| 13 |
> |
* This class contains the main method to be run by |
| 14 |
> |
* the filter children. It harvests UDP traffic. |
| 15 |
> |
* |
| 16 |
> |
* @author $Author$ |
| 17 |
> |
* @version $Id$ |
| 18 |
> |
*/ |
| 19 |
|
public class UDPReader extends Thread{ |
| 20 |
|
|
| 21 |
< |
// It is normal to use this constructor in preference |
| 22 |
< |
// to any other in this class. |
| 23 |
< |
public UDPReader(int port, Logger logger){ |
| 24 |
< |
this.logger = logger; |
| 25 |
< |
this.port = port; |
| 26 |
< |
} |
| 21 |
> |
//---FINAL ATTRIBUTES--- |
| 22 |
> |
|
| 23 |
> |
/** |
| 24 |
> |
* The current CVS revision of this class |
| 25 |
> |
*/ |
| 26 |
> |
public final String REVISION = "$Revision$"; |
| 27 |
|
|
| 28 |
< |
public UDPReader(Logger logger){ |
| 29 |
< |
this(4589, logger); |
| 28 |
> |
//---STATIC METHODS--- |
| 29 |
> |
|
| 30 |
> |
//---CONSTRUCTORS--- |
| 31 |
> |
|
| 32 |
> |
/** |
| 33 |
> |
* It is normal to use this constructor in preference |
| 34 |
> |
* to any other in this class. |
| 35 |
> |
*/ |
| 36 |
> |
public UDPReader(int port, Filter parent){ |
| 37 |
> |
_port = port; |
| 38 |
> |
_parent = parent; |
| 39 |
|
} |
| 40 |
|
|
| 41 |
+ |
//---PUBLIC METHODS--- |
| 42 |
+ |
|
| 43 |
|
public void run() { |
| 44 |
|
|
| 45 |
|
DatagramSocket socket = null; |
| 46 |
|
try { |
| 47 |
< |
socket = new DatagramSocket(port); |
| 47 |
> |
socket = new DatagramSocket(_port); |
| 48 |
|
} |
| 49 |
|
catch (BindException e){ |
| 50 |
< |
logger.write(this.toString(), Logger.SYSMSG, "Could not start the UDPReader thread on port "+port+" as this port was already in use."); |
| 50 |
> |
_logger.write(this.toString(), Logger.FATAL, "Could not start the UDPReader thread on port "+_port+" as this port was already in use."); |
| 51 |
|
return; |
| 52 |
|
} |
| 53 |
|
catch (Exception e){ |
| 54 |
< |
logger.write(this.toString(), Logger.SYSMSG, "Could not start the UDPReader thread on port "+port+"."); |
| 54 |
> |
_logger.write(this.toString(), Logger.FATAL, "Could not start the UDPReader thread on port "+_port+"."); |
| 55 |
|
return; |
| 56 |
|
} |
| 57 |
|
|
| 58 |
< |
logger.write(this.toString(), Logger.SYSMSG, "UDPReader thread ready and listening for UDP packets on port "+port); |
| 58 |
> |
_logger.write(this.toString(), Logger.SYSMSG, "UDPReader thread ready and listening for UDP packets on port "+_port); |
| 59 |
|
|
| 60 |
|
byte[] buf; |
| 61 |
|
|
| 62 |
|
boolean running = true; |
| 63 |
|
while (running){ |
| 64 |
|
try { |
| 65 |
+ |
|
| 66 |
+ |
// receive request and pass on to the FilterThread. |
| 67 |
|
buf = new byte[packetSizeLimit]; |
| 45 |
– |
// receive request |
| 68 |
|
DatagramPacket packet = new DatagramPacket(buf, buf.length); |
| 69 |
|
socket.receive(packet); |
| 70 |
< |
FilterThread t = new FilterThread(); |
| 71 |
< |
t.run(packet); |
| 70 |
> |
FilterThread t = new FilterThread(packet, _parent); |
| 71 |
> |
t.start(); |
| 72 |
> |
|
| 73 |
|
} |
| 74 |
|
catch (IOException e) { |
| 75 |
< |
logger.write(this.toString(), Logger.SYSMSG, "The UDPReader thread has been shut down as an exception occured: "+e); |
| 75 |
> |
_logger.write(this.toString(), Logger.WARNING, "This UDPReader thread has been shut down as an exception occured: "+e); |
| 76 |
|
return; |
| 77 |
|
} |
| 78 |
|
} |
| 79 |
|
socket.close(); |
| 80 |
|
} |
| 81 |
< |
|
| 82 |
< |
|
| 83 |
< |
Logger logger; |
| 84 |
< |
int port; |
| 85 |
< |
|
| 81 |
> |
|
| 82 |
> |
/** |
| 83 |
> |
* Overrides the {@link java.lang.Object#toString() Object.toString()} |
| 84 |
> |
* method to provide clean logging (every class should have this). |
| 85 |
> |
* |
| 86 |
> |
* @return the name of this class and its CVS revision |
| 87 |
> |
*/ |
| 88 |
> |
public String toString() { |
| 89 |
> |
return this.getClass().getName() + "(" + REVISION.substring(11, REVISION.length() - 2) + ")"; |
| 90 |
> |
} |
| 91 |
> |
|
| 92 |
> |
//---PRIVATE METHODS--- |
| 93 |
> |
|
| 94 |
> |
//---ACCESSOR/MUTATOR METHODS--- |
| 95 |
> |
|
| 96 |
> |
//---ATTRIBUTES--- |
| 97 |
> |
|
| 98 |
> |
Logger _logger = ReferenceManager.getInstance().getLogger(); |
| 99 |
> |
int _port; |
| 100 |
> |
Filter _parent; |
| 101 |
> |
|
| 102 |
|
final int packetSizeLimit = 8192; |
| 103 |
< |
|
| 103 |
> |
|
| 104 |
> |
//---STATIC ATTRIBUTES--- |
| 105 |
> |
|
| 106 |
|
} |
