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 |
< |
// |
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, Filter parent, Logger logger){ |
24 |
< |
this.logger = logger; |
25 |
< |
this.port = port; |
26 |
< |
this.parent = parent; |
18 |
< |
} |
21 |
> |
//---FINAL ATTRIBUTES--- |
22 |
> |
|
23 |
> |
/** |
24 |
> |
* The current CVS revision of this class |
25 |
> |
*/ |
26 |
> |
public final String REVISION = "$Revision$"; |
27 |
|
|
28 |
< |
public UDPReader(Filter parent, Logger logger){ |
29 |
< |
this(4589, parent, 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.FATAL, "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.FATAL, "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 |
|
|
67 |
|
buf = new byte[packetSizeLimit]; |
68 |
|
DatagramPacket packet = new DatagramPacket(buf, buf.length); |
69 |
|
socket.receive(packet); |
70 |
< |
FilterThread t = new FilterThread(parent, packet); |
70 |
> |
FilterThread t = new FilterThread(packet, _parent); |
71 |
|
t.start(); |
72 |
|
|
73 |
|
} |
74 |
|
catch (IOException e) { |
75 |
< |
logger.write(this.toString(), Logger.WARNING, "This 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 |
|
} |
62 |
– |
|
63 |
– |
|
64 |
– |
Logger logger; |
65 |
– |
int port; |
66 |
– |
Filter parent; |
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 |
|
} |