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

Comparing projects/cms/source/server/uk/org/iscream/cms/server/filter/FilterThread.java (file contents):
Revision 1.7 by tdb, Mon Nov 27 21:47:13 2000 UTC vs.
Revision 1.37 by tdb, Fri Sep 6 15:10:48 2002 UTC

#	Line 1 | Line 1
1	+	/*
2	+	* i-scream central monitoring system
3	+	* http://www.i-scream.org.uk
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.*;
28	<	import uk.ac.ukc.iscream.core.*;
29	<	import uk.ac.ukc.iscream.filter.*;
28	>	import uk.org.iscream.cms.server.core.*;
29	>	import uk.org.iscream.cms.server.componentmanager.*;
30	>	import uk.org.iscream.cms.server.filter.*;
31	>	import uk.org.iscream.cms.server.util.*;
32
33	<	// Handle an incoming UDP packet as a separate thread.
33	>	/**
34	>	* Handle an incoming packet as a separate thread.
35	>	* Passes the data through various plugins, then
36	>	* passes it on to the parent filter.
37	>	*
38	>	* Now grabs data from a single queue, rather than
39	>	* waiting to be contacted.
40	>	*
41	>	* @author  $Author$
42	>	* @version $Id$
43	>	*/
44		public class FilterThread extends Thread{
45
46	<	// Class constructor. Obtains the byte[] from a DatagramPacket.
47	<	public FilterThread(DatagramPacket packet, Filter parent, Logger logger){
48	<	this.parent = parent;
49	<	this.rawPacket = packet.getData();
50	<	this.logger = logger;
51	<	}
46	>	//---FINAL ATTRIBUTES---
47	>
48	>	/**
49	>	* The current CVS revision of this class
50	>	*/
51	>	public final String REVISION = "$Revision$";
52
53	<	// Class constructor for passing XML Strings.
54	<	public FilterThread(String xml, Filter parent, Logger logger){
55	<	this.parent = parent;
56	<	this.rawPacket = xml.getBytes();
53	>	//---STATIC METHODS---
54	>
55	>	//---CONSTRUCTORS---
56	>
57	>	/**
58	>	* Constructs an instance of a FilterThread
59	>	*
60	>	* @param queue the Queue this filter is using
61	>	*/
62	>	public FilterThread(Queue queue){
63	>	// set the Thread name
64	>	setName("filter.FilterThread");
65	>
66	>	_queue = queue;
67	>	_logger.write(toString(), Logger.SYSINIT, "created");
68		}
69	<
69	>
70	>	//---PUBLIC METHODS---
71	>
72	>	/**
73	>	* Runs the thread, getting data from the Queue and
74	>	* sending it on to the parent filter.
75	>	*/
76		public void run(){
77	<
78	<	// Get a string without any null characters in it.
79	<	String xml = new String(rawPacket);
80	<	if (xml.indexOf(0) != -1) {
81	<	xml = xml.substring(0, xml.indexOf(0));
77	>	// setup the XMLPacketMaker
78	>	XMLPacketMaker xmlPacketMaker = new XMLPacketMaker();
79	>	// get a queue for ourselves
80	>	int n = _queue.getQueue();
81	>	// keep these out here, saves recreating the object
82	>	String xml = null;
83	>	String parentFilterName = "";
84	>	Filter parent = null;
85	>	while(true) {
86	>	// get a String of xml
87	>	try {
88	>	xml = (String) _queue.get(n);
89	>	}
90	>	catch (InvalidQueueException e) {
91	>	_logger.write(toString(), Logger.ERROR, "Queue error: "+e);
92	>	}
93	>
94	>	// Get a string without any null characters in it.
95	>	//  -- maybe String.trim() would be better here ?
96	>	if (xml.indexOf(0) != -1) {
97	>	xml = xml.substring(0, xml.indexOf(0));
98	>	}
99	>
100	>	// Bundle the XML all on one line (saves space and simplifies
101	>	// the protocol between clientinterface and client).
102	>	StringTokenizer tokenizer = new StringTokenizer(new String(xml), "\n");
103	>	xml = "";
104	>	while (tokenizer.hasMoreTokens()) {
105	>	xml += tokenizer.nextToken();
106	>	}
107	>
108	>	// Use XMLPacketMaker to make an XMLPacket object.
109	>	XMLPacket packet = null;
110	>	try {
111	>	packet = xmlPacketMaker.createXMLPacket(xml);
112	>	} catch(InvalidXMLException e) {
113	>	_logger.write(toString(), Logger.ERROR, "Invalid XML: "+e);
114	>	// skip the rest of this loop iteration
115	>	continue;
116	>	}
117	>
118	>	// get parent
119	>	try {
120	>	String newParent = ConfigurationProxy.getInstance().getProperty("Filter." + FilterMain.NAME, "Filter.parentFilter");
121	>	if(!parentFilterName.equals(newParent)) {
122	>	parentFilterName = newParent;
123	>	parent = FilterHelper.narrow(_refman.getCORBARef("iscream.Filter\\." + parentFilterName));
124	>	_logger.write(toString(), Logger.DEBUG, "Parent filter changed to: "+parentFilterName);
125	>	}
126	>	} catch (PropertyNotFoundException e) {
127	>	continue;
128	>	}
129	>
130	>	// XMLPacket is ok, run filters...
131	>	if(PluginFilterManager.getInstance().runFilters(packet)) {
132	>	// and pass it on...
133	>	parent.receiveXML(xml);
134	>	}
135	>	else {
136	>	// ... or filtered it
137	>	_logger.write(toString(), Logger.DEBUG, "An XML packet was sucessfully filtered from the system.");
138	>	}
139		}
140	<	else {
31	<	xml = xml.substring(0, xml.length());
32	<	}
33	<	//System.out.println(xml);
140	>	}
141
142	<	// Use my XMLPacketMaker to make an XMLPacket object.
143	<	XMLPacketMaker xmlPacketMaker = new XMLPacketMaker(xml, logger);
144	<	XMLPacket packet = xmlPacketMaker.createXMLPacket();
145	<
146	<	if (packet == null){
147	<	// A null XML packet was returned - don't pass it on.
148	<	logger.write(this.toString(), Logger.SYSMSG, "An XML UDP packet was sucessfully filtered from the system.");
149	<	return;
150	<	}
151	<
152	<	// Now do something with this XMLPacket!!!
153	<	// .... let's try this...
154	<	parent.receiveXML(xml);
155	<
142	>	/**
143	>	* Overrides the {@link java.lang.Object#toString() Object.toString()}
144	>	* method to provide clean logging (every class should have this).
145	>	*
146	>	* This uses the uk.org.iscream.cms.server.util.NameFormat class
147	>	* to format the toString()
148	>	*
149	>	* @return the name of this class and its CVS revision
150	>	*/
151	>	public String toString() {
152	>	return FormatName.getName(
153	>	_name,
154	>	getClass().getName(),
155	>	REVISION);
156		}
157	+
158	+	//---PRIVATE METHODS---
159	+
160	+	//---ACCESSOR/MUTATOR METHODS---
161	+
162	+	//---ATTRIBUTES---
163
164	<	Filter parent;
165	<	byte[] rawPacket;
166	<	Logger logger;
164	>	/**
165	>	* The Queue object
166	>	*/
167	>	Queue _queue;
168	>
169	>	/**
170	>	* This is the friendly identifier of the
171	>	* component this class is running in.
172	>	* eg, a Filter may be called "filter1",
173	>	* If this class does not have an owning
174	>	* component,  a name from the configuration
175	>	* can be placed here.  This name could also
176	>	* be changed to null for utility classes.
177	>	*/
178	>	private String _name = FilterMain.NAME;
179	>
180	>	/**
181	>	* This holds a reference to the
182	>	* system logger that is being used.
183	>	*/
184	>	private Logger _logger = ReferenceManager.getInstance().getLogger();
185	>
186	>	/**
187	>	* A reference to the reference manager in use
188	>	*/
189	>	private ReferenceManager _refman = ReferenceManager.getInstance();
190	>
191	>	//---STATIC ATTRIBUTES---
192	>
193		}

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