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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 1.27 by tdb, Sun Sep 25 09:57:42 2005 UTC

#	Line 1 | Line 1
1	+	/*
2	+	* i-scream central monitoring system
3	+	* http://www.i-scream.org
4	+	* Copyright (C) 2000-2002 i-scream
5	+	*
6	+	* This program is free software; you can redistribute it and/or
7	+	* modify it under the terms of the GNU General Public License
8	+	* as published by the Free Software Foundation; either version 2
9	+	* of the License, or (at your option) any later version.
10	+	*
11	+	* This program is distributed in the hope that it will be useful,
12	+	* but WITHOUT ANY WARRANTY; without even the implied warranty of
13	+	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14	+	* GNU General Public License for more details.
15	+	*
16	+	* You should have received a copy of the GNU General Public License
17	+	* along with this program; if not, write to the Free Software
18	+	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
19	+	*/
20	+
21	+	//---PACKAGE DECLARATION---
22	+	package uk.org.iscream.cms.server.filter;
23	+
24	+	//---IMPORTS---
25		import java.io.*;
26		import java.net.*;
27	<	import java.util.*;
27	>	import uk.org.iscream.cms.server.core.*;
28	>	import uk.org.iscream.cms.server.componentmanager.*;
29	>	import uk.org.iscream.cms.server.filter.*;
30	>	import uk.org.iscream.cms.util.*;
31
32	<	// This class contains the main method to be run by
33	<	// the filter children.  It harvests UDP traffic.
34	<	//
35	<	//
32	>	/**
33	>	* This class contains the main method to be run by
34	>	* the filterd.  It harvests UDP traffic, and queues it.
35	>	*
36	>	* @author  $Author$
37	>	* @version $Id$
38	>	*/
39		public class UDPReader extends Thread{
40
41	<	// It is normal to use this constructor in preference
42	<	// to any other in this class.
43	<	public UDPReader(int port, Logger logger){
44	<	this.logger = logger;
45	<	this.port = port;
46	<	}
41	>	//---FINAL ATTRIBUTES---
42	>
43	>	/**
44	>	* The current CVS revision of this class
45	>	*/
46	>	public final String REVISION = "$Revision$";
47
48	<	public UDPReader(Logger logger){
49	<	this(4589, logger);
48	>	/**
49	>	* The maximum size of a packet
50	>	*/
51	>	private final int packetSizeLimit = 8192;
52	>
53	>	//---STATIC METHODS---
54	>
55	>	//---CONSTRUCTORS---
56	>
57	>	/**
58	>	* Constructs a new UDPReader.
59	>	*
60	>	* @param port The port on which we listen for UDP data
61	>	* @param queue The queue which we are using
62	>	*/
63	>	public UDPReader(int port, Queue queue){
64	>	// set the Thread name
65	>	setName("filter.UDPReader");
66	>
67	>	_port = port;
68	>	_queue = queue;
69	>	_logger.write(toString(), Logger.SYSINIT, "started");
70		}
71
72	+	//---PUBLIC METHODS---
73	+
74	+	/**
75	+	* The main method in the class. Reads and queues XML sent
76	+	* over UDP.
77	+	*/
78		public void run() {
79	<
79	>	// setup an empty ACL defaulting to ALLOW
80	>	ACL acl = new ACL(ACL.ALLOW);
81	>
82	>	// setup a Datagram socket
83		DatagramSocket socket = null;
84		try {
85	<	socket = new DatagramSocket(port);
85	>	socket = new ACLDatagramSocket(acl, _port);
86		}
87		catch (BindException e){
88	<	logger.write(this.toString(), Logger.SYSMSG, "Could not start the UDPReader thread on port "+port+" as this port was already in use.");
88	>	_logger.write(this.toString(), Logger.FATAL, "Could not start the UDPReader thread on port "+_port+" as this port was already in use.");
89		return;
90		}
91		catch (Exception e){
92	<	logger.write(this.toString(), Logger.SYSMSG, "Could not start the UDPReader thread on port "+port+".");
92	>	_logger.write(this.toString(), Logger.FATAL, "Could not start the UDPReader thread on port "+_port+".");
93		return;
94		}
95
96	<	logger.write(this.toString(), Logger.SYSMSG, "UDPReader thread ready and listening for UDP packets on port "+port);
97	<
96	>	_logger.write(this.toString(), Logger.SYSMSG, "UDPReader thread ready and listening for UDP packets on port "+_port);
97	>
98		byte[] buf;
99
100	+	ConfigurationProxy cp = ConfigurationProxy.getInstance();
101	+	String stringACL = "";
102	+	String newStringACL = "";
103	+
104	+	// read UDP packets and queue them
105		boolean running = true;
106		while (running){
107	+	// get hold of the ACL in the configuration
108		try {
109	+	newStringACL = cp.getProperty("Filter." + FilterMain.NAME, "Filter.UDPACL");
110	+	}
111	+	catch(PropertyNotFoundException e) {
112	+	// if we can't find it, we'll just use a null ACL
113	+	newStringACL = "";
114	+	_logger.write(toString(), Logger.WARNING, "No ACL found for UDPReader, using empty ACL instead: " + e);
115	+	}
116	+	// check to see if the ACL has changed
117	+	if(!newStringACL.equals(stringACL)) {
118	+	_logger.write(toString(), Logger.SYSMSG, "Reloading Access Control List");
119	+	// clear the ACL
120	+	acl.clear();
121	+	// set the default to something sane
122	+	acl.setDefaultMode(ACL.ALLOW);
123	+	// add the new ACL (this may change the default)
124	+	acl.add(newStringACL);
125	+	stringACL = newStringACL;
126	+	}
127	+	try {
128	+
129	+	// receive request and put it in the Queue
130		buf = new byte[packetSizeLimit];
45	–	// receive request
131		DatagramPacket packet = new DatagramPacket(buf, buf.length);
132		socket.receive(packet);
133	<	FilterThread t = new FilterThread();
134	<	t.run(packet);
133	>	String xml = new String(packet.getData());
134	>	_queue.add(xml);
135		}
136		catch (IOException e) {
137	<	logger.write(this.toString(), Logger.SYSMSG, "The UDPReader thread has been shut down as an exception occured: "+e);
138	<	return;
137	>	_logger.write(this.toString(), Logger.WARNING, "This UDPReader thread has been shut down as an exception occured: "+e);
138	>	running = false;
139		}
140		}
141		socket.close();
142		}
143
144	+	/**
145	+	* Overrides the {@link java.lang.Object#toString() Object.toString()}
146	+	* method to provide clean logging (every class should have this).
147	+	*
148	+	* This uses the uk.org.iscream.cms.util.NameFormat class
149	+	* to format the toString()
150	+	*
151	+	* @return the name of this class and its CVS revision
152	+	*/
153	+	public String toString() {
154	+	return FormatName.getName(
155	+	_name,
156	+	getClass().getName(),
157	+	REVISION);
158	+	}
159	+
160	+	//---PRIVATE METHODS---
161	+
162	+	//---ACCESSOR/MUTATOR METHODS---
163	+
164	+	//---ATTRIBUTES---
165	+
166	+	/**
167	+	* This is the friendly identifier of the
168	+	* component this class is running in.
169	+	* eg, a Filter may be called "filter1",
170	+	* If this class does not have an owning
171	+	* component,  a name from the configuration
172	+	* can be placed here.  This name could also
173	+	* be changed to null for utility classes.
174	+	*/
175	+	private String _name = FilterMain.NAME;
176
177	<	Logger logger;
178	<	int port;
177	>	/**
178	>	* This holds a reference to the
179	>	* system logger that is being used.
180	>	*/
181	>	private Logger _logger = ReferenceManager.getInstance().getLogger();
182
183	<	final int packetSizeLimit = 8192;
183	>	/**
184	>	* The port that this reader is using
185	>	*/
186	>	int _port;
187
188	+	/**
189	+	* The Queue object
190	+	*/
191	+	Queue _queue;
192	+
193	+	//---STATIC ATTRIBUTES---
194	+
195		}

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