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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 1.2 by tdb, Wed Nov 22 09:32:00 2000 UTC vs.
Revision 1.15 by tdb, Thu Feb 1 00:18:42 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, Filter parent, Logger logger){
25	<	this.logger = logger;
26	<	this.port = port;
27	<	this.parent = parent;
19	<	}
22	>	//---FINAL ATTRIBUTES---
23	>
24	>	/**
25	>	* The current CVS revision of this class
26	>	*/
27	>	public final String REVISION = "$Revision$";
28
29	<	public UDPReader(Filter parent, Logger logger){
30	<	this(4589, parent, logger);
29	>	/**
30	>	* The maximum size of a packet
31	>	*/
32	>	private final int packetSizeLimit = 8192;
33	>
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	>	_logger.write(toString(), Logger.SYSINIT, "started");
48		}
49
50	+	//---PUBLIC METHODS---
51	+
52	+	/**
53	+	* The main method in the class. Reads and queues XML sent
54	+	* over UDP.
55	+	*/
56		public void run() {
57	<
57	>
58	>	// setup a Datagram socket
59		DatagramSocket socket = null;
60		try {
61	<	socket = new DatagramSocket(port);
61	>	socket = new DatagramSocket(_port);
62		}
63		catch (BindException e){
64	<	logger.write(this.toString(), Logger.SYSMSG, "Could not start the UDPReader thread on port "+port+" as this port was already in use.");
64	>	_logger.write(this.toString(), Logger.FATAL, "Could not start the UDPReader thread on port "+_port+" as this port was already in use.");
65		return;
66		}
67		catch (Exception e){
68	<	logger.write(this.toString(), Logger.SYSMSG, "Could not start the UDPReader thread on port "+port+".");
68	>	_logger.write(this.toString(), Logger.FATAL, "Could not start the UDPReader thread on port "+_port+".");
69		return;
70		}
71
72	<	logger.write(this.toString(), Logger.SYSMSG, "UDPReader thread ready and listening for UDP packets on port "+port);
73	<
72	>	_logger.write(this.toString(), Logger.SYSMSG, "UDPReader thread ready and listening for UDP packets on port "+_port);
73	>
74		byte[] buf;
75
76	+	// read UDP packets and queue them
77		boolean running = true;
78		while (running){
79		try {
80	+
81	+	// receive request and put it in the Queue
82		buf = new byte[packetSizeLimit];
48	–	// receive request
83		DatagramPacket packet = new DatagramPacket(buf, buf.length);
84		socket.receive(packet);
85	<	FilterThread t = new FilterThread(parent);
86	<	t.run(packet);
85	>	String xml = new String(packet.getData());
86	>	_queue.add(xml);
87		}
88		catch (IOException e) {
89	<	logger.write(this.toString(), Logger.SYSMSG, "The UDPReader thread has been shut down as an exception occured: "+e);
90	<	return;
89	>	_logger.write(this.toString(), Logger.WARNING, "This UDPReader thread has been shut down as an exception occured: "+e);
90	>	running = false;
91		}
92		}
93		socket.close();
94		}
95
96	<
97	<	Logger logger;
98	<	int port;
99	<	Filter parent;
96	>	/**
97	>	* Overrides the {@link java.lang.Object#toString() Object.toString()}
98	>	* method to provide clean logging (every class should have this).
99	>	*
100	>	* This uses the uk.ac.ukc.iscream.util.NameFormat class
101	>	* to format the toString()
102	>	*
103	>	* @return the name of this class and its CVS revision
104	>	*/
105	>	public String toString() {
106	>	return FormatName.getName(
107	>	_name,
108	>	getClass().getName(),
109	>	REVISION);
110	>	}
111
112	<	final int packetSizeLimit = 8192;
112	>	//---PRIVATE METHODS---
113	>
114	>	//---ACCESSOR/MUTATOR METHODS---
115	>
116	>	//---ATTRIBUTES---
117	>
118	>	/**
119	>	* This is the friendly identifier of the
120	>	* component this class is running in.
121	>	* eg, a Filter may be called "filter1",
122	>	* If this class does not have an owning
123	>	* component,  a name from the configuration
124	>	* can be placed here.  This name could also
125	>	* be changed to null for utility classes.
126	>	*/
127	>	private String _name = FilterMain.NAME;
128
129	+	/**
130	+	* This holds a reference to the
131	+	* system logger that is being used.
132	+	*/
133	+	private Logger _logger = ReferenceManager.getInstance().getLogger();
134	+
135	+	/**
136	+	* The port that this reader is using
137	+	*/
138	+	int _port;
139	+
140	+	/**
141	+	* The Queue object
142	+	*/
143	+	Queue _queue;
144	+
145	+	//---STATIC ATTRIBUTES---
146	+
147		}

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