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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 1.9 by ajm, Wed Nov 29 21:27:39 2000 UTC vs.
Revision 1.23 by tdb, Mon Feb 12 00:45:33 2001 UTC

#	Line 6 | Line 6 | 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.xml.*;
11	>	import uk.ac.ukc.iscream.util.*;
12
13		/**
14	<	* Handle an incoming UDP packet as a separate thread.
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		*/
#	Line 27 | Line 33 | public class FilterThread extends Thread{
33		//---STATIC METHODS---
34
35		//---CONSTRUCTORS---
36	<
37	<	// Class constructor. Obtains the byte[] from a DatagramPacket.
38	<	public FilterThread(DatagramPacket packet, String name, Filter parent, Logger logger){
39	<	_name = name;
40	<	this.parent = parent;
41	<	this.rawPacket = packet.getData();
42	<	this.logger = logger;
43	<	logger.write(this.toString(), Logger.DEBUG, "created");
44	<
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		}
40	–
41	–	// Class constructor for passing XML Strings.
42	–	public FilterThread(String xml, String name, Filter parent, Logger logger){
43	–	_name = name;
44	–	this.logger = logger;
45	–	this.parent = parent;
46	–	this.rawPacket = xml.getBytes();
47	–	logger.write(this.toString(), Logger.DEBUG, "created");
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		}
59	–	else {
60	–	xml = xml.substring(0, xml.length());
61	–	}
62	–
63	–	// Use my XMLPacketMaker to make an XMLPacket object.
64	–	XMLPacketMaker xmlPacketMaker = new XMLPacketMaker(xml, logger);
65	–	XMLPacket packet = xmlPacketMaker.createXMLPacket();
66	–
67	–	logger.write(this.toString(), Logger.DEBUG, "got data, filtering and passing to parent - " + packet.printAll());
68	–
69	–	if (packet == null){
70	–	// A null XML packet was returned - don't pass it on.
71	–	logger.write(this.toString(), Logger.SYSMSG, "An XML UDP packet was sucessfully filtered from the system.");
72	–	return;
73	–	}
74	–
75	–	// Now do something with this XMLPacket!!!
76	–	// .... let's try this...
77	–	parent.receiveXML(xml);
78	–
107		}
108
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 this.getClass().getName() + "{" + _name + "}(" + REVISION.substring(11, REVISION.length() - 2) + ")";
119	>	return FormatName.getName(
120	>	_name,
121	>	getClass().getName(),
122	>	REVISION);
123		}
124
125		//---PRIVATE METHODS---
#	Line 94 | Line 128 | public class FilterThread extends Thread{
128
129		//---ATTRIBUTES---
130
131	<	Filter parent;
132	<	byte[] rawPacket;
133	<	Logger logger;
134	<	String _name;
131	>	/**
132	>	* Our parent filter
133	>	*/
134	>	Filter _parent;
135	>
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

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