server/filter/FilterThread.java

/* 
 * i-scream central monitoring system
 * http://www.i-scream.org
 * Copyright (C) 2000-2002 i-scream
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

//---PACKAGE DECLARATION---
package uk.org.iscream.cms.server.filter;

//---IMPORTS---
import java.io.*;
import java.net.*;
import java.util.StringTokenizer;
import uk.org.iscream.cms.server.core.*;
import uk.org.iscream.cms.server.componentmanager.*;
import uk.org.iscream.cms.server.filter.*;
import uk.org.iscream.cms.util.*;

/**
 * Handle an incoming packet as a separate thread.
 * Passes the data through various plugins, then 
 * passes it on to the parent filter.
 *
 * Now grabs data from a single queue, rather than
 * waiting to be contacted.
 *
 * @author  $Author: tdb $
 * @version $Id: FilterThread.java,v 1.40 2004/08/01 10:40:59 tdb Exp $
 */
public class FilterThread extends Thread{

//---FINAL ATTRIBUTES---

    /**
     * The current CVS revision of this class
     */
    public final String REVISION = "$Revision: 1.40 $";
    
//---STATIC METHODS---

//---CONSTRUCTORS---
   
    /**
     * Constructs an instance of a FilterThread
     *
     * @param queue the Queue this filter is using
     */
    public FilterThread(Queue queue){
        // set the Thread name
        setName("filter.FilterThread");
        
        _queue = queue;
        _logger.write(toString(), Logger.SYSINIT, "created");
    }

//---PUBLIC METHODS---

    /**
     * Runs the thread, getting data from the Queue and
     * sending it on to the parent filter.
     */
    public void run(){
        // get a queue for ourselves
        int n = _queue.getQueue();
        // keep these out here, saves recreating the object
        String xml = null;
        String parentFilterName = "";
        Filter parent = null;
        while(true) {
            // get a String of xml
            try {
                xml = (String) _queue.get(n);
            }
            catch (InvalidQueueException e) {
                _logger.write(toString(), Logger.ERROR, "Queue error: "+e);
            }
            
            // Get a string without any null characters in it.
            //  -- maybe String.trim() would be better here ?
            if (xml.indexOf(0) != -1) {
                xml = xml.substring(0, xml.indexOf(0));
            }
            
            // Bundle the XML all on one line (saves space and simplifies
            // the protocol between clientinterface and client).
            StringTokenizer tokenizer = new StringTokenizer(new String(xml), "\n");
            xml = "";
            while (tokenizer.hasMoreTokens()) {
                xml += tokenizer.nextToken();
            }
            
            // Get an XMLPacket from the XMLCache.
            XMLPacket packet = null;
            try {
                packet = _xmlCache.getXMLPacket(xml);
            } catch(InvalidXMLException e) {
                _logger.write(toString(), Logger.ERROR, "Invalid XML: "+e);
                // skip the rest of this loop iteration
                continue;
            }
            
            // get parent
            try {
                String newParent = ConfigurationProxy.getInstance().getProperty("Filter." + FilterMain.NAME, "Filter.parentFilter");
                if(!parentFilterName.equals(newParent)) {
                    parentFilterName = newParent;
                    parent = FilterHelper.narrow(_refman.getCORBARef("iscream.Filter\\." + parentFilterName));
                    _logger.write(toString(), Logger.DEBUG, "Parent filter changed to: "+parentFilterName);
                }
            } catch (PropertyNotFoundException e) {
                continue;
            }
                    
            // XMLPacket is ok, run filters...
            if(PluginFilterManager.getInstance().runFilters(packet)) {
                // and pass it on...
                parent.receiveXML(xml);
            }
            else {
                // ... or filtered it
                _logger.write(toString(), Logger.DEBUG, "An XML packet was sucessfully filtered from the system.");
            }
        }
    }

    /**
     * Overrides the {@link java.lang.Object#toString() Object.toString()}
     * method to provide clean logging (every class should have this).
     *
     * This uses the uk.org.iscream.cms.util.NameFormat class
     * to format the toString()
     *
     * @return the name of this class and its CVS revision
     */
    public String toString() {
        return FormatName.getName(
            _name,
            getClass().getName(),
            REVISION);
    }

//---PRIVATE METHODS---

//---ACCESSOR/MUTATOR METHODS---

//---ATTRIBUTES---
    
    /**
     * The Queue object
     */
    Queue _queue;
    
    /**
     * This is the friendly identifier of the
     * component this class is running in.
     * eg, a Filter may be called "filter1",
     * If this class does not have an owning
     * component,  a name from the configuration
     * can be placed here.  This name could also
     * be changed to null for utility classes.
     */
    private String _name = FilterMain.NAME;

    /**
     * This holds a reference to the
     * system logger that is being used.
     */
    private Logger _logger = ReferenceManager.getInstance().getLogger();

    /**
     * A reference to the reference manager in use
     */
    private ReferenceManager _refman = ReferenceManager.getInstance();
    
    /**
     * A reference to the XMLCache in use
     */
    private XMLCache _xmlCache = XMLCache.getInstance();

//---STATIC ATTRIBUTES---

}
Revision:	1.41
Committed:	Sun Sep 25 09:57:42 2005 UTC (18 years, 7 months ago) by tdb
Branch:	MAIN
CVS Tags:	HEAD
Changes since 1.40:	+3 -3 lines
Log Message:	Fix compile problems on j2se 1.5 - our Queue class conflicted with one in java.util. Also fix an API issue when running the server on Windows - the println method sends '\r\n' on Windows instead of '\n' on Unix, which confuses applications such as ihost. Patch provided by: skel
#	User	Rev	Content
1	tdb	1.35	/*
2			* i-scream central monitoring system
3	tdb	1.40	* http://www.i-scream.org
4	tdb	1.35	* 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	tdb	1.8	//---PACKAGE DECLARATION---
22	tdb	1.32	package uk.org.iscream.cms.server.filter;
23	tdb	1.8
24			//---IMPORTS---
25	pjm2	1.1	import java.io.*;
26			import java.net.*;
27	tdb	1.41	import java.util.StringTokenizer;
28	tdb	1.32	import uk.org.iscream.cms.server.core.*;
29			import uk.org.iscream.cms.server.componentmanager.*;
30			import uk.org.iscream.cms.server.filter.*;
31	tdb	1.39	import uk.org.iscream.cms.util.*;
32	pjm2	1.1
33	tdb	1.8	/**
34	ajm	1.14	* 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	tdb	1.8	*
38	tdb	1.15	* Now grabs data from a single queue, rather than
39			* waiting to be contacted.
40			*
41	tdb	1.33	* @author $Author: tdb $
42	tdb	1.41	* @version $Id: FilterThread.java,v 1.40 2004/08/01 10:40:59 tdb Exp $
43	tdb	1.8	*/
44	tdb	1.2	public class FilterThread extends Thread{
45	pjm2	1.1
46	tdb	1.8	//---FINAL ATTRIBUTES---
47
48			/**
49			* The current CVS revision of this class
50			*/
51	tdb	1.41	public final String REVISION = "$Revision: 1.40 $";
52	tdb	1.8
53			//---STATIC METHODS---
54
55			//---CONSTRUCTORS---
56	tdb	1.15
57	ajm	1.14	/**
58	tdb	1.18	* Constructs an instance of a FilterThread
59			*
60			* @param queue the Queue this filter is using
61	ajm	1.14	*/
62	tdb	1.28	public FilterThread(Queue queue){
63	tdb	1.27	// set the Thread name
64			setName("filter.FilterThread");
65
66	tdb	1.15	_queue = queue;
67	tdb	1.19	_logger.write(toString(), Logger.SYSINIT, "created");
68	pjm2	1.1	}
69	tdb	1.8
70			//---PUBLIC METHODS---
71
72	ajm	1.14	/**
73	tdb	1.18	* Runs the thread, getting data from the Queue and
74			* sending it on to the parent filter.
75	ajm	1.14	*/
76	pjm2	1.1	public void run(){
77	tdb	1.15	// get a queue for ourselves
78			int n = _queue.getQueue();
79	pjm2	1.16	// keep these out here, saves recreating the object
80	tdb	1.15	String xml = null;
81	tdb	1.30	String parentFilterName = "";
82			Filter parent = null;
83	tdb	1.15	while(true) {
84			// get a String of xml
85			try {
86			xml = (String) _queue.get(n);
87			}
88			catch (InvalidQueueException e) {
89			_logger.write(toString(), Logger.ERROR, "Queue error: "+e);
90			}
91
92			// Get a string without any null characters in it.
93			// -- maybe String.trim() would be better here ?
94			if (xml.indexOf(0) != -1) {
95			xml = xml.substring(0, xml.indexOf(0));
96			}
97	pjm2	1.16
98			// Bundle the XML all on one line (saves space and simplifies
99	tdb	1.18	// the protocol between clientinterface and client).
100	pjm2	1.16	StringTokenizer tokenizer = new StringTokenizer(new String(xml), "\n");
101			xml = "";
102			while (tokenizer.hasMoreTokens()) {
103			xml += tokenizer.nextToken();
104			}
105	tdb	1.15
106	tdb	1.38	// Get an XMLPacket from the XMLCache.
107	tdb	1.25	XMLPacket packet = null;
108			try {
109	tdb	1.38	packet = _xmlCache.getXMLPacket(xml);
110	tdb	1.25	} catch(InvalidXMLException e) {
111			_logger.write(toString(), Logger.ERROR, "Invalid XML: "+e);
112			// skip the rest of this loop iteration
113			continue;
114			}
115	tdb	1.28
116			// get parent
117			try {
118	tdb	1.33	String newParent = ConfigurationProxy.getInstance().getProperty("Filter." + FilterMain.NAME, "Filter.parentFilter");
119	tdb	1.30	if(!parentFilterName.equals(newParent)) {
120	tdb	1.31	parentFilterName = newParent;
121	tdb	1.37	parent = FilterHelper.narrow(_refman.getCORBARef("iscream.Filter\\." + parentFilterName));
122	tdb	1.30	_logger.write(toString(), Logger.DEBUG, "Parent filter changed to: "+parentFilterName);
123			}
124	tdb	1.28	} catch (PropertyNotFoundException e) {
125			continue;
126			}
127
128			// XMLPacket is ok, run filters...
129	tdb	1.25	if(PluginFilterManager.getInstance().runFilters(packet)) {
130			// and pass it on...
131	tdb	1.28	parent.receiveXML(xml);
132	tdb	1.15	}
133			else {
134	tdb	1.25	// ... or filtered it
135			_logger.write(toString(), Logger.DEBUG, "An XML packet was sucessfully filtered from the system.");
136	tdb	1.15	}
137	pjm2	1.1	}
138			}
139	tdb	1.8
140			/**
141			* Overrides the {@link java.lang.Object#toString() Object.toString()}
142			* method to provide clean logging (every class should have this).
143			*
144	tdb	1.39	* This uses the uk.org.iscream.cms.util.NameFormat class
145	ajm	1.14	* to format the toString()
146			*
147	tdb	1.8	* @return the name of this class and its CVS revision
148			*/
149			public String toString() {
150	ajm	1.14	return FormatName.getName(
151			_name,
152			getClass().getName(),
153			REVISION);
154	tdb	1.8	}
155
156			//---PRIVATE METHODS---
157
158			//---ACCESSOR/MUTATOR METHODS---
159
160			//---ATTRIBUTES---
161	ajm	1.14
162			/**
163	tdb	1.15	* The Queue object
164	ajm	1.14	*/
165	tdb	1.15	Queue _queue;
166	ajm	1.14
167			/**
168			* This is the friendly identifier of the
169			* component this class is running in.
170			* eg, a Filter may be called "filter1",
171			* If this class does not have an owning
172			* component, a name from the configuration
173			* can be placed here. This name could also
174			* be changed to null for utility classes.
175			*/
176			private String _name = FilterMain.NAME;
177
178			/**
179			* This holds a reference to the
180			* system logger that is being used.
181			*/
182			private Logger _logger = ReferenceManager.getInstance().getLogger();
183	tdb	1.28
184			/**
185			* A reference to the reference manager in use
186			*/
187			private ReferenceManager _refman = ReferenceManager.getInstance();
188	tdb	1.38
189			/**
190			* A reference to the XMLCache in use
191			*/
192			private XMLCache _xmlCache = XMLCache.getInstance();
193	tdb	1.8
194			//---STATIC ATTRIBUTES---
195
196	pjm2	1.1	}