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root/i-scream/projects/cms/source/server/uk/org/iscream/cms/server/filter/UDPReader.java

Comparing projects/cms/source/server/uk/org/iscream/cms/server/filter/UDPReader.java (file contents):
Revision 1.1 by pjm2, Wed Nov 22 08:40:53 2000 UTC vs.
Revision 1.14 by tdb, Sun Jan 28 05:34:38 2001 UTC

#	Line 1 | Line 1
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.componentmanager.*;
10	+	import uk.ac.ukc.iscream.filter.*;
11	+	import uk.ac.ukc.iscream.util.*;
12
13	<	// This class contains the main method to be run by
14	<	// the filter children.  It harvests UDP traffic.
15	<	//
16	<	//
13	>	/**
14	>	* This class contains the main method to be run by
15	>	* the filterd.  It harvests UDP traffic, and queues it.
16	>	*
17	>	* @author  $Author$
18	>	* @version $Id$
19	>	*/
20		public class UDPReader extends Thread{
21
22	<	// It is normal to use this constructor in preference
23	<	// to any other in this class.
24	<	public UDPReader(int port, Logger logger){
25	<	this.logger = logger;
26	<	this.port = port;
27	<	}
22	>	//---FINAL ATTRIBUTES---
23	>
24	>	/**
25	>	* The current CVS revision of this class
26	>	*/
27	>	public final String REVISION = "$Revision$";
28	>
29	>	/**
30	>	* The maximum size of a packet
31	>	*/
32	>	private final int packetSizeLimit = 8192;
33
34	<	public UDPReader(Logger logger){
35	<	this(4589, logger);
34	>	//---STATIC METHODS---
35	>
36	>	//---CONSTRUCTORS---
37	>
38	>	/**
39	>	* Constructs a new UDPReader.
40	>	*
41	>	* @param port The port on which we listen for UDP data
42	>	* @param queue The queue which we are using
43	>	*/
44	>	public UDPReader(int port, Queue queue){
45	>	_port = port;
46	>	_queue = queue;
47		}
48
49	+	//---PUBLIC METHODS---
50	+
51	+	/**
52	+	* The main method in the class. Reads and queues XML sent
53	+	* over UDP.
54	+	*/
55		public void run() {
56	<
56	>
57	>	// setup a Datagram socket
58		DatagramSocket socket = null;
59		try {
60	<	socket = new DatagramSocket(port);
60	>	socket = new DatagramSocket(_port);
61		}
62		catch (BindException e){
63	<	logger.write(this.toString(), Logger.SYSMSG, "Could not start the UDPReader thread on port "+port+" as this port was already in use.");
63	>	_logger.write(this.toString(), Logger.FATAL, "Could not start the UDPReader thread on port "+_port+" as this port was already in use.");
64		return;
65		}
66		catch (Exception e){
67	<	logger.write(this.toString(), Logger.SYSMSG, "Could not start the UDPReader thread on port "+port+".");
67	>	_logger.write(this.toString(), Logger.FATAL, "Could not start the UDPReader thread on port "+_port+".");
68		return;
69		}
70
71	<	logger.write(this.toString(), Logger.SYSMSG, "UDPReader thread ready and listening for UDP packets on port "+port);
71	>	_logger.write(this.toString(), Logger.SYSMSG, "UDPReader thread ready and listening for UDP packets on port "+_port);
72
73		byte[] buf;
74
75	+	// read UDP packets and queue them
76		boolean running = true;
77		while (running){
78		try {
79	+
80	+	// receive request and put it in the Queue
81		buf = new byte[packetSizeLimit];
45	–	// receive request
82		DatagramPacket packet = new DatagramPacket(buf, buf.length);
83		socket.receive(packet);
84	<	FilterThread t = new FilterThread();
85	<	t.run(packet);
84	>	String xml = new String(packet.getData());
85	>	_queue.add(xml);
86		}
87		catch (IOException e) {
88	<	logger.write(this.toString(), Logger.SYSMSG, "The UDPReader thread has been shut down as an exception occured: "+e);
89	<	return;
88	>	_logger.write(this.toString(), Logger.WARNING, "This UDPReader thread has been shut down as an exception occured: "+e);
89	>	running = false;
90		}
91		}
92		socket.close();
93		}
94	+
95	+	/**
96	+	* Overrides the {@link java.lang.Object#toString() Object.toString()}
97	+	* method to provide clean logging (every class should have this).
98	+	*
99	+	* This uses the uk.ac.ukc.iscream.util.NameFormat class
100	+	* to format the toString()
101	+	*
102	+	* @return the name of this class and its CVS revision
103	+	*/
104	+	public String toString() {
105	+	return FormatName.getName(
106	+	_name,
107	+	getClass().getName(),
108	+	REVISION);
109	+	}
110	+
111	+	//---PRIVATE METHODS---
112	+
113	+	//---ACCESSOR/MUTATOR METHODS---
114	+
115	+	//---ATTRIBUTES---
116	+
117	+	/**
118	+	* This is the friendly identifier of the
119	+	* component this class is running in.
120	+	* eg, a Filter may be called "filter1",
121	+	* If this class does not have an owning
122	+	* component,  a name from the configuration
123	+	* can be placed here.  This name could also
124	+	* be changed to null for utility classes.
125	+	*/
126	+	private String _name = FilterMain.NAME;
127	+
128	+	/**
129	+	* This holds a reference to the
130	+	* system logger that is being used.
131	+	*/
132	+	private Logger _logger = ReferenceManager.getInstance().getLogger();
133
134	+	/**
135	+	* The port that this reader is using
136	+	*/
137	+	int _port;
138
139	<	Logger logger;
140	<	int port;
141	<
142	<	final int packetSizeLimit = 8192;
143	<
139	>	/**
140	>	* The Queue object
141	>	*/
142	>	Queue _queue;
143	>
144	>	//---STATIC ATTRIBUTES---
145	>
146		}

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