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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 1.4 by pjm2, Thu Nov 23 09:14:29 2000 UTC vs.
Revision 1.23 by tdb, Mon Feb 12 00:45:33 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	<	// 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(Filter parent, DatagramPacket packet){
28	<	this.parent = parent;
29	<	this.rawPacket = packet.getData();
30	<	}
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(Filter parent, String xml){
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	>	* @param parent a CORBA reference to our parent filter
42	>	*/
43	>	public FilterThread(Queue queue, Filter parent){
44	>	_parent = parent;
45	>	_queue = queue;
46	>	_logger.write(toString(), Logger.SYSINIT, "created");
47		}
48	<
48	>
49	>	//---PUBLIC METHODS---
50	>
51	>	/**
52	>	* Runs the thread, getting data from the Queue and
53	>	* sending it on to the parent filter.
54	>	*/
55		public void run(){
56	<
57	<	// Get a string without any null characters in it.
58	<	String xml = new String(rawPacket);
59	<	if (xml.indexOf(0) != -1) {
60	<	xml = xml.substring(0, xml.indexOf(0));
56	>	// get a queue for ourselves
57	>	int n = _queue.getQueue();
58	>	// keep these out here, saves recreating the object
59	>	String xml = null;
60	>	while(true) {
61	>	// get a String of xml
62	>	try {
63	>	xml = (String) _queue.get(n);
64	>	}
65	>	catch (InvalidQueueException e) {
66	>	_logger.write(toString(), Logger.ERROR, "Queue error: "+e);
67	>	}
68	>
69	>	// Get a string without any null characters in it.
70	>	//  -- maybe String.trim() would be better here ?
71	>	if (xml.indexOf(0) != -1) {
72	>	xml = xml.substring(0, xml.indexOf(0));
73	>	}
74	>	else {
75	>	xml = xml.substring(0, xml.length());
76	>	}
77	>
78	>	// Bundle the XML all on one line (saves space and simplifies
79	>	// the protocol between clientinterface and client).
80	>	StringTokenizer tokenizer = new StringTokenizer(new String(xml), "\n");
81	>	xml = "";
82	>	while (tokenizer.hasMoreTokens()) {
83	>	xml += tokenizer.nextToken();
84	>	}
85	>
86	>	// Use XMLPacketMaker to make an XMLPacket object.
87	>	XMLPacketMaker xmlPacketMaker = new XMLPacketMaker(xml);
88	>	XMLPacket packet = xmlPacketMaker.createXMLPacket();
89	>
90	>	if(packet != null) {
91	>	// packet is not null
92	>	// packet was not dropped by a plugin
93	>	// ... best pass it on !
94	>	if(PluginFilterManager.getInstance().runFilters(packet)) {
95	>	_parent.receiveXML(xml);
96	>	}
97	>	else {
98	>	// we filtered it
99	>	_logger.write(toString(), Logger.DEBUG, "An XML packet was sucessfully filtered from the system.");
100	>	}
101	>	}
102	>	else {
103	>	// we had a null
104	>	_logger.write(toString(), Logger.DEBUG, "An packet containing ill-parsing XML was rejected.");
105	>	}
106		}
107	<	else {
29	<	xml = xml.substring(0, xml.length());
30	<	}
31	<	System.out.println(xml);
107	>	}
108
109	<	// Use my XMLPacketMaker to make an XMLPacket object.
110	<	XMLPacketMaker xmlPacketMaker = new XMLPacketMaker(xml);
111	<	XMLPacket packet = xmlPacketMaker.createXMLPacket();
112	<
113	<	if (packet == null){
114	<	System.out.println("UDPReaderThread - A null XMLPacket was returned, I think I'll ignore it!");
115	<	return;
116	<	}
117	<	System.out.println("UDPReaderThread - An XML Packet was read sucessfully: -");
118	<	packet.printAll();
119	<	// Now do something with this XMLPacket!!!
120	<	// .... let's try this...
121	<	parent.receiveXML(xml);
122	<
109	>	/**
110	>	* Overrides the {@link java.lang.Object#toString() Object.toString()}
111	>	* method to provide clean logging (every class should have this).
112	>	*
113	>	* This uses the uk.ac.ukc.iscream.util.NameFormat class
114	>	* to format the toString()
115	>	*
116	>	* @return the name of this class and its CVS revision
117	>	*/
118	>	public String toString() {
119	>	return FormatName.getName(
120	>	_name,
121	>	getClass().getName(),
122	>	REVISION);
123		}
124	+
125	+	//---PRIVATE METHODS---
126	+
127	+	//---ACCESSOR/MUTATOR METHODS---
128	+
129	+	//---ATTRIBUTES---
130	+
131	+	/**
132	+	* Our parent filter
133	+	*/
134	+	Filter _parent;
135
136	<	Filter parent;
137	<	byte[] rawPacket;
136	>	/**
137	>	* The Queue object
138	>	*/
139	>	Queue _queue;
140	>
141	>	/**
142	>	* This is the friendly identifier of the
143	>	* component this class is running in.
144	>	* eg, a Filter may be called "filter1",
145	>	* If this class does not have an owning
146	>	* component,  a name from the configuration
147	>	* can be placed here.  This name could also
148	>	* be changed to null for utility classes.
149	>	*/
150	>	private String _name = FilterMain.NAME;
151	>
152	>	/**
153	>	* This holds a reference to the
154	>	* system logger that is being used.
155	>	*/
156	>	private Logger _logger = ReferenceManager.getInstance().getLogger();
157	>
158	>	//---STATIC ATTRIBUTES---
159	>
160		}

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