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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 1.5 by pjm2, Thu Nov 23 09:21:48 2000 UTC vs.
Revision 1.21 by tdb, Wed Mar 20 13:05:50 2002 UTC

#	Line 1 | Line 1
1	+	//---PACKAGE DECLARATION---
2	+	package uk.org.iscream.cms.server.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.*;
8	>	import uk.org.iscream.cms.server.core.*;
9	>	import uk.org.iscream.cms.server.componentmanager.*;
10	>	import uk.org.iscream.cms.server.filter.*;
11	>	import uk.org.iscream.cms.server.util.*;
12
13	<	// This class contains the main method to be run by
14	<	// the filter children.  It harvests UDP traffic.
15	<	//
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;
18	<	}
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	>	// set the Thread name
46	>	setName("filter.UDPReader");
47	>
48	>	_port = port;
49	>	_queue = queue;
50	>	_logger.write(toString(), Logger.SYSINIT, "started");
51		}
52
53	+	//---PUBLIC METHODS---
54	+
55	+	/**
56	+	* The main method in the class. Reads and queues XML sent
57	+	* over UDP.
58	+	*/
59		public void run() {
60	<
60	>	// get our ACL from the configuration
61	>	ACL acl = null;
62	>	try {
63	>	String stringACL = ConfigurationProxy.getInstance().getProperty("Filter." + FilterMain.NAME, "Filter.UDPACL");
64	>	acl = new ACL(stringACL);
65	>	}
66	>	catch(PropertyNotFoundException e) {
67	>	_logger.write(toString(), Logger.WARNING, "No ACL found for UDPReader: " + e);
68	>	}
69	>
70	>	// setup a Datagram socket
71		DatagramSocket socket = null;
72		try {
73	<	socket = new DatagramSocket(port);
73	>	// use an ACLServerSocket if we have an ACL
74	>	if(acl != null) {
75	>	socket = new ACLDatagramSocket(acl, _port);
76	>	}
77	>	else {
78	>	socket = new DatagramSocket(_port);
79	>	}
80		}
81		catch (BindException e){
82	<	logger.write(this.toString(), Logger.FATAL, "Could not start the UDPReader thread on port "+port+" as this port was already in use.");
82	>	_logger.write(this.toString(), Logger.FATAL, "Could not start the UDPReader thread on port "+_port+" as this port was already in use.");
83		return;
84		}
85		catch (Exception e){
86	<	logger.write(this.toString(), Logger.FATAL, "Could not start the UDPReader thread on port "+port+".");
86	>	_logger.write(this.toString(), Logger.FATAL, "Could not start the UDPReader thread on port "+_port+".");
87		return;
88		}
89
90	<	logger.write(this.toString(), Logger.SYSMSG, "UDPReader thread ready and listening for UDP packets on port "+port);
91	<
90	>	_logger.write(this.toString(), Logger.SYSMSG, "UDPReader thread ready and listening for UDP packets on port "+_port);
91	>
92		byte[] buf;
93
94	+	// read UDP packets and queue them
95		boolean running = true;
96		while (running){
97		try {
98	<
99	<	// receive request and pass on to the FilterThread.
98	>
99	>	// receive request and put it in the Queue
100		buf = new byte[packetSizeLimit];
101		DatagramPacket packet = new DatagramPacket(buf, buf.length);
102		socket.receive(packet);
103	<	FilterThread t = new FilterThread(packet, parent, logger);
104	<	t.start();
53	<
103	>	String xml = new String(packet.getData());
104	>	_queue.add(xml);
105		}
106		catch (IOException e) {
107	<	logger.write(this.toString(), Logger.WARNING, "This UDPReader thread has been shut down as an exception occured: "+e);
108	<	return;
107	>	_logger.write(this.toString(), Logger.WARNING, "This UDPReader thread has been shut down as an exception occured: "+e);
108	>	running = false;
109		}
110		}
111		socket.close();
112		}
113
114	<
115	<	Logger logger;
116	<	int port;
117	<	Filter parent;
114	>	/**
115	>	* Overrides the {@link java.lang.Object#toString() Object.toString()}
116	>	* method to provide clean logging (every class should have this).
117	>	*
118	>	* This uses the uk.org.iscream.cms.server.util.NameFormat class
119	>	* to format the toString()
120	>	*
121	>	* @return the name of this class and its CVS revision
122	>	*/
123	>	public String toString() {
124	>	return FormatName.getName(
125	>	_name,
126	>	getClass().getName(),
127	>	REVISION);
128	>	}
129
130	<	final int packetSizeLimit = 8192;
130	>	//---PRIVATE METHODS---
131	>
132	>	//---ACCESSOR/MUTATOR METHODS---
133	>
134	>	//---ATTRIBUTES---
135	>
136	>	/**
137	>	* This is the friendly identifier of the
138	>	* component this class is running in.
139	>	* eg, a Filter may be called "filter1",
140	>	* If this class does not have an owning
141	>	* component,  a name from the configuration
142	>	* can be placed here.  This name could also
143	>	* be changed to null for utility classes.
144	>	*/
145	>	private String _name = FilterMain.NAME;
146
147	+	/**
148	+	* This holds a reference to the
149	+	* system logger that is being used.
150	+	*/
151	+	private Logger _logger = ReferenceManager.getInstance().getLogger();
152	+
153	+	/**
154	+	* The port that this reader is using
155	+	*/
156	+	int _port;
157	+
158	+	/**
159	+	* The Queue object
160	+	*/
161	+	Queue _queue;
162	+
163	+	//---STATIC ATTRIBUTES---
164	+
165		}

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