1 |
tdb |
1.6 |
//---PACKAGE DECLARATION--- |
2 |
|
|
package uk.ac.ukc.iscream.filter; |
3 |
|
|
|
4 |
|
|
//---IMPORTS--- |
5 |
pjm2 |
1.1 |
import java.io.*; |
6 |
|
|
import java.net.*; |
7 |
|
|
import java.util.*; |
8 |
tdb |
1.2 |
import uk.ac.ukc.iscream.core.*; |
9 |
|
|
import uk.ac.ukc.iscream.filter.*; |
10 |
ajm |
1.9 |
import uk.ac.ukc.iscream.util.*; |
11 |
pjm2 |
1.1 |
|
12 |
tdb |
1.6 |
/** |
13 |
|
|
* This class contains the main method to be run by |
14 |
|
|
* the filter children. It harvests UDP traffic. |
15 |
|
|
* |
16 |
ajm |
1.9 |
* @author $Author: tdb1 $ |
17 |
|
|
* @version $Id: UDPReader.java,v 1.8 2000/11/30 02:00:55 tdb1 Exp $ |
18 |
tdb |
1.6 |
*/ |
19 |
pjm2 |
1.1 |
public class UDPReader extends Thread{ |
20 |
|
|
|
21 |
tdb |
1.6 |
//---FINAL ATTRIBUTES--- |
22 |
|
|
|
23 |
|
|
/** |
24 |
|
|
* The current CVS revision of this class |
25 |
|
|
*/ |
26 |
ajm |
1.9 |
public final String REVISION = "$Revision: 1.8 $"; |
27 |
tdb |
1.6 |
|
28 |
|
|
//---STATIC METHODS--- |
29 |
|
|
|
30 |
|
|
//---CONSTRUCTORS--- |
31 |
|
|
|
32 |
pjm2 |
1.1 |
// It is normal to use this constructor in preference |
33 |
|
|
// to any other in this class. |
34 |
tdb |
1.8 |
public UDPReader(int port, Filter parent){ |
35 |
|
|
_port = port; |
36 |
|
|
_parent = parent; |
37 |
pjm2 |
1.1 |
} |
38 |
|
|
|
39 |
tdb |
1.6 |
//---PUBLIC METHODS--- |
40 |
|
|
|
41 |
pjm2 |
1.1 |
public void run() { |
42 |
|
|
|
43 |
|
|
DatagramSocket socket = null; |
44 |
|
|
try { |
45 |
tdb |
1.8 |
socket = new DatagramSocket(_port); |
46 |
pjm2 |
1.1 |
} |
47 |
|
|
catch (BindException e){ |
48 |
tdb |
1.8 |
_logger.write(this.toString(), Logger.FATAL, "Could not start the UDPReader thread on port "+_port+" as this port was already in use."); |
49 |
pjm2 |
1.1 |
return; |
50 |
|
|
} |
51 |
|
|
catch (Exception e){ |
52 |
tdb |
1.8 |
_logger.write(this.toString(), Logger.FATAL, "Could not start the UDPReader thread on port "+_port+"."); |
53 |
pjm2 |
1.1 |
return; |
54 |
|
|
} |
55 |
|
|
|
56 |
tdb |
1.8 |
_logger.write(this.toString(), Logger.SYSMSG, "UDPReader thread ready and listening for UDP packets on port "+_port); |
57 |
pjm2 |
1.1 |
|
58 |
|
|
byte[] buf; |
59 |
|
|
|
60 |
|
|
boolean running = true; |
61 |
|
|
while (running){ |
62 |
|
|
try { |
63 |
pjm2 |
1.3 |
|
64 |
|
|
// receive request and pass on to the FilterThread. |
65 |
pjm2 |
1.1 |
buf = new byte[packetSizeLimit]; |
66 |
|
|
DatagramPacket packet = new DatagramPacket(buf, buf.length); |
67 |
|
|
socket.receive(packet); |
68 |
tdb |
1.8 |
FilterThread t = new FilterThread(packet, _parent); |
69 |
pjm2 |
1.3 |
t.start(); |
70 |
|
|
|
71 |
pjm2 |
1.1 |
} |
72 |
|
|
catch (IOException e) { |
73 |
tdb |
1.8 |
_logger.write(this.toString(), Logger.WARNING, "This UDPReader thread has been shut down as an exception occured: "+e); |
74 |
pjm2 |
1.1 |
return; |
75 |
|
|
} |
76 |
|
|
} |
77 |
|
|
socket.close(); |
78 |
|
|
} |
79 |
tdb |
1.6 |
|
80 |
|
|
/** |
81 |
|
|
* Overrides the {@link java.lang.Object#toString() Object.toString()} |
82 |
|
|
* method to provide clean logging (every class should have this). |
83 |
|
|
* |
84 |
|
|
* @return the name of this class and its CVS revision |
85 |
|
|
*/ |
86 |
|
|
public String toString() { |
87 |
|
|
return this.getClass().getName() + "(" + REVISION.substring(11, REVISION.length() - 2) + ")"; |
88 |
|
|
} |
89 |
|
|
|
90 |
|
|
//---PRIVATE METHODS--- |
91 |
|
|
|
92 |
|
|
//---ACCESSOR/MUTATOR METHODS--- |
93 |
|
|
|
94 |
|
|
//---ATTRIBUTES--- |
95 |
|
|
|
96 |
tdb |
1.8 |
Logger _logger = ReferenceManager.getInstance().getLogger(); |
97 |
|
|
int _port; |
98 |
|
|
Filter _parent; |
99 |
tdb |
1.2 |
|
100 |
pjm2 |
1.1 |
final int packetSizeLimit = 8192; |
101 |
tdb |
1.6 |
|
102 |
|
|
//---STATIC ATTRIBUTES--- |
103 |
|
|
|
104 |
pjm2 |
1.1 |
} |