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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 1.6 by pjm2, Thu Nov 23 09:36:07 2000 UTC vs.
Revision 1.31 by tdb, Fri Mar 16 00:17:04 2001 UTC

#	Line 1 | Line 1
1	+	//---PACKAGE DECLARATION---
2	+	package uk.org.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.filter.*;
8	>	import uk.org.iscream.core.*;
9	>	import uk.org.iscream.componentmanager.*;
10	>	import uk.org.iscream.filter.*;
11	>	import uk.org.iscream.util.*;
12
13	<	// Handle an incoming UDP packet as a separate thread.
13	>	/**
14	>	* Handle an incoming packet as a separate thread.
15	>	* Passes the data through various plugins, then
16	>	* passes it on to the parent filter.
17	>	*
18	>	* Now grabs data from a single queue, rather than
19	>	* waiting to be contacted.
20	>	*
21	>	* @author  $Author$
22	>	* @version $Id$
23	>	*/
24		public class FilterThread extends Thread{
25
26	<	// Class constructor. Obtains the byte[] from a DatagramPacket.
27	<	public FilterThread(DatagramPacket packet, Filter parent, Logger logger){
28	<	this.parent = parent;
29	<	this.rawPacket = packet.getData();
30	<	this.logger = logger;
31	<	}
26	>	//---FINAL ATTRIBUTES---
27	>
28	>	/**
29	>	* The current CVS revision of this class
30	>	*/
31	>	public final String REVISION = "$Revision$";
32
33	<	// Class constructor for passing XML Strings.
34	<	public FilterThread(String xml, Filter parent, Logger logger){
35	<	this.parent = parent;
36	<	this.rawPacket = xml.getBytes();
33	>	//---STATIC METHODS---
34	>
35	>	//---CONSTRUCTORS---
36	>
37	>	/**
38	>	* Constructs an instance of a FilterThread
39	>	*
40	>	* @param queue the Queue this filter is using
41	>	*/
42	>	public FilterThread(Queue queue){
43	>	// set the Thread name
44	>	setName("filter.FilterThread");
45	>
46	>	_queue = queue;
47	>	_logger.write(toString(), Logger.SYSINIT, "created");
48		}
49	<
49	>
50	>	//---PUBLIC METHODS---
51	>
52	>	/**
53	>	* Runs the thread, getting data from the Queue and
54	>	* sending it on to the parent filter.
55	>	*/
56		public void run(){
57	<
58	<	// Get a string without any null characters in it.
59	<	String xml = new String(rawPacket);
60	<	if (xml.indexOf(0) != -1) {
61	<	xml = xml.substring(0, xml.indexOf(0));
57	>	// setup the XMLPacketMaker
58	>	XMLPacketMaker xmlPacketMaker = new XMLPacketMaker();
59	>	// get a queue for ourselves
60	>	int n = _queue.getQueue();
61	>	// keep these out here, saves recreating the object
62	>	String xml = null;
63	>	String parentFilterName = "";
64	>	Filter parent = null;
65	>	while(true) {
66	>	// get a String of xml
67	>	try {
68	>	xml = (String) _queue.get(n);
69	>	}
70	>	catch (InvalidQueueException e) {
71	>	_logger.write(toString(), Logger.ERROR, "Queue error: "+e);
72	>	}
73	>
74	>	// Get a string without any null characters in it.
75	>	//  -- maybe String.trim() would be better here ?
76	>	if (xml.indexOf(0) != -1) {
77	>	xml = xml.substring(0, xml.indexOf(0));
78	>	}
79	>	else {
80	>	xml = xml.substring(0, xml.length());
81	>	}
82	>
83	>	// Bundle the XML all on one line (saves space and simplifies
84	>	// the protocol between clientinterface and client).
85	>	StringTokenizer tokenizer = new StringTokenizer(new String(xml), "\n");
86	>	xml = "";
87	>	while (tokenizer.hasMoreTokens()) {
88	>	xml += tokenizer.nextToken();
89	>	}
90	>
91	>	// Use XMLPacketMaker to make an XMLPacket object.
92	>	XMLPacket packet = null;
93	>	try {
94	>	packet = xmlPacketMaker.createXMLPacket(xml);
95	>	} catch(InvalidXMLException e) {
96	>	_logger.write(toString(), Logger.ERROR, "Invalid XML: "+e);
97	>	// skip the rest of this loop iteration
98	>	continue;
99	>	}
100	>
101	>	// get parent
102	>	try {
103	>	String newParent = ConfigurationProxy.getInstance().getProperty(FilterMain.NAME, "Filter.parentFilter");
104	>	if(!parentFilterName.equals(newParent)) {
105	>	parentFilterName = newParent;
106	>	parent = FilterHelper.narrow(_refman.getCORBARef("iscream.Filter." + parentFilterName));
107	>	_logger.write(toString(), Logger.DEBUG, "Parent filter changed to: "+parentFilterName);
108	>	}
109	>	} catch (PropertyNotFoundException e) {
110	>	continue;
111	>	}
112	>
113	>	// XMLPacket is ok, run filters...
114	>	if(PluginFilterManager.getInstance().runFilters(packet)) {
115	>	// and pass it on...
116	>	parent.receiveXML(xml);
117	>	}
118	>	else {
119	>	// ... or filtered it
120	>	_logger.write(toString(), Logger.DEBUG, "An XML packet was sucessfully filtered from the system.");
121	>	}
122		}
123	<	else {
31	<	xml = xml.substring(0, xml.length());
32	<	}
33	<	System.out.println(xml);
123	>	}
124
125	<	// Use my XMLPacketMaker to make an XMLPacket object.
126	<	XMLPacketMaker xmlPacketMaker = new XMLPacketMaker(xml, logger);
127	<	XMLPacket packet = xmlPacketMaker.createXMLPacket();
128	<
129	<	if (packet == null){
130	<	// A null XML packet was returned - don't pass it on.
131	<	logger.write(this.toString(), Logger.SYSMSG, "An XML UDP packet was sucessfully filtered from the system.");
132	<	return;
133	<	}
134	<
135	<	// Now do something with this XMLPacket!!!
136	<	// .... let's try this...
137	<	parent.receiveXML(xml);
138	<
125	>	/**
126	>	* Overrides the {@link java.lang.Object#toString() Object.toString()}
127	>	* method to provide clean logging (every class should have this).
128	>	*
129	>	* This uses the uk.org.iscream.util.NameFormat class
130	>	* to format the toString()
131	>	*
132	>	* @return the name of this class and its CVS revision
133	>	*/
134	>	public String toString() {
135	>	return FormatName.getName(
136	>	_name,
137	>	getClass().getName(),
138	>	REVISION);
139		}
140	+
141	+	//---PRIVATE METHODS---
142	+
143	+	//---ACCESSOR/MUTATOR METHODS---
144	+
145	+	//---ATTRIBUTES---
146
147	<	Filter parent;
148	<	byte[] rawPacket;
149	<	Logger logger;
147	>	/**
148	>	* The Queue object
149	>	*/
150	>	Queue _queue;
151	>
152	>	/**
153	>	* This is the friendly identifier of the
154	>	* component this class is running in.
155	>	* eg, a Filter may be called "filter1",
156	>	* If this class does not have an owning
157	>	* component,  a name from the configuration
158	>	* can be placed here.  This name could also
159	>	* be changed to null for utility classes.
160	>	*/
161	>	private String _name = FilterMain.NAME;
162	>
163	>	/**
164	>	* This holds a reference to the
165	>	* system logger that is being used.
166	>	*/
167	>	private Logger _logger = ReferenceManager.getInstance().getLogger();
168	>
169	>	/**
170	>	* A reference to the reference manager in use
171	>	*/
172	>	private ReferenceManager _refman = ReferenceManager.getInstance();
173	>
174	>	//---STATIC ATTRIBUTES---
175	>
176		}

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