server/core/ConfigurationManagerServant.java

//---PACKAGE DECLARATION---
package uk.ac.ukc.iscream.core;

//---IMPORTS---
import uk.ac.ukc.iscream.util.*;
import uk.ac.ukc.iscream.componentmanager.*;
import java.util.*;
import java.io.*;

/**
 * This class is essentially a Configuration factory.
 * This class implements the Configurator IDL and allows
 * other classes in the system ot obtain their Configuration
 *
 * On construction it requires a reference to the RootPOA
 * to allow it to create Configuration objects to be
 * returned.
 *
 * It also relies on the System.properties to set internal values.
 *
 * ###
 * A point to note is that this class does NOT yet manage
 * created configurations which may cause memory problems!
 * ###
 *
 * @author  $Author: ajm4 $
 * @version $Id: ConfigurationManagerServant.java,v 1.11 2001/03/01 19:42:20 ajm4 Exp $
 */
class ConfigurationManagerServant extends ConfigurationManagerPOA {

//---FINAL ATTRIBUTES---

    /**
     * The current CVS revision of this class
     */
    public final String REVISION = "$Revision: 1.11 $";
    
//---STATIC METHODS---

//---CONSTRUCTORS---

    /**
     * Creates a new ConfiguratorServant
     * This class uses the System.properties to set internal values
     */
    ConfigurationManagerServant() {
        // assign some local variables
        _configPath = System.getProperty("uk.ac.ukc.iscream.ConfigurationLocation");
        _systemConfigFile = System.getProperty("uk.ac.ukc.iscream.SystemConfigurationFile");

        // load the system config
        loadSystemConfig();

        // log our status
        _logger.write(toString(), Logger.SYSINIT, "started");
        _logger.write(toString(), Logger.SYSMSG, "configuration location - " + _configPath);
        _logger.write(toString(), Logger.SYSMSG, "system configuration file - " + _systemConfigFile);
    }

//---PUBLIC METHODS---
    
    /**
     * Returns a Configuration object which contains
     * the configuration data requested by the calling
     * object.
     *
     * This method will look in the systemConfig file
     * for an entry for this "source", if there is no
     * entry it returns a refernce to the system
     * config.  If there are any errors in reading the 
     * configuration, it returns null, the caller is 
     * expected to be able to handle this.
     *
     * This method also checks to see if the system.conf
     * file has been updated and reloads its reference if
     * needed.
     *
     * @param source the configuration required
     * @return the Configuration
     */
    public Configuration getConfiguration(String source) {
        _logger.write(toString(), Logger.SYSMSG, "got request for " + source);

        
        // check to see if we need to reload the system config
        // because it has changed
        if (isModified(_systemConfig.getFileList(), _systemConfig.getLastModified())) {
            _logger.write(toString(), Logger.SYSMSG, "system config changed");
            loadSystemConfig();
        }

        // search config for group membership
        LinkedList groups = getGroupMembership(source);

        // add the hosts individual config to the start of the list
        groups.addFirst(source);

        Iterator i = groups.iterator();
        String fileList = "";
        while (i.hasNext()) {
            String groupName = (String) i.next();
            _logger.write(toString(), Logger.DEBUG, "looking for config entry for - " + groupName);
            // we look for this entry in the systemConfig
            String configFile = _systemConfig.getProperty("config." + groupName);
            // if there is a config entry then
            if (configFile != null) {
                _logger.write(toString(), Logger.DEBUG, "looking for config tree in - " + configFile);
    
                // get the file list of includes etc + the system config
                String groupFileList = null;
                try {
                    groupFileList = getIncludedFiles(configFile, "") + ";";
                } catch (Exception e) {
                    // not sure what to do here
                    // so we just log the error
                    _logger.write(toString(), Logger.ERROR, "ERROR - " + e);
                }
                if (groupFileList != null) {
                    fileList += groupFileList;
                }
            } else {
                _logger.write(toString(), Logger.DEBUG, "no config entry for - " + groupName);
            }
        }
        // add the system config as the final check
        fileList += _systemConfigFile + ";";
        _logger.write(toString(), Logger.DEBUG, "config tree - " + fileList);
        
        // build the configuration
        Configuration config = buildConfiguration(fileList);
        
        // if this is null at this point, then there will have been an error
        return config;
    }
    
    
    /**
     * When passed a file list and a current value for the lastModified
     * of the current configuration, this method compares the value
     * to the actual value of the configuration files to determine 
     * whether or not the configuration has been modified.
     *
     * @param fileList a list of files that the caller uses for configuration
     * @param lastModified the last modified date of the callers configuration
     *
     * @return whether or not the configuration has been modified
     */
    public boolean isModified(String fileList, long lastModified) {
        StringTokenizer st = new StringTokenizer(fileList, ";");
        long newLastModified;
        File currentFile;
        while (st.hasMoreTokens()) {
            currentFile = new File(_configPath, st.nextToken());
            newLastModified = currentFile.lastModified();
            if (newLastModified > lastModified) {
                return true;
            }
        }
        return false;
    }

    /**
     * Overrides the {@link java.lang.Object#toString() Object.toString()}
     * method to provide clean logging (every class should have this).
     *
     * This uses the uk.ac.ukc.iscream.util.FormatName 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---

    /**
     * This is a recursive function private to this class.
     * It constructs a hierarchy of files as a ";" serperated
     * string which can be used to read in the configuration.
     * This function calls itself.
     * 
     * @param currentFile the current file to be processed
     * @param readFiles used for recursion purposes only, these are the files it has read so far 
     *
     * @return the current list that has been constructed
     *
     * @throws IOException if there is trouble reading the file
     * @throws FileNotFoundException is there is trouble finding the file
     * @throws CircularIncludeException this is if a circular include is detected
     */
    private String getIncludedFiles(String currentFile, String readFiles) throws IOException, FileNotFoundException, Exception {
        
        // check for circular include here
        if (hasDuplicate(currentFile, readFiles) || currentFile.equals(_systemConfigFile)) {
            throw new CircularIncludeException(currentFile + " is included more than once");
        }
        
        // if there wasn't, we're gonna use this file, so make a note of it as read
        // (note the use of the ";", this is for the hasDuplicate, function)
        readFiles = readFiles + currentFile + ";";

        Properties properties = new Properties();
        properties.load(new FileInputStream(new File(_configPath, currentFile)));
        
        // get the include property
        String includes = properties.getProperty("include");

        // if we're the last file with no includes, return our name
        if (includes == null) {
            return currentFile;
        
        // otherwise, recurse over our includes
        } else {
            StringTokenizer st = new StringTokenizer(includes, ";");
            String returnList= "";
            while (st.hasMoreTokens()) {
                returnList = getIncludedFiles(st.nextToken(), readFiles) + ";" + returnList;
            }
            
            return returnList + currentFile;
        }
    }

    /**
     * This simple method checks to see if a given 
     * file exists in the given list.
     *
     * @param file the file to check the list for
     * @param fileList the list to check
     *
     * @return if the given file appeard in the list
     */
    private boolean hasDuplicate(String file, String fileList) {
        StringTokenizer st = new StringTokenizer(fileList, ";");
        while (st.hasMoreTokens()) {
            if (file.equals(st.nextToken())) {
                return true;
            }
        }
        return false;
    }

    /**
     * Opens and loads the system configuration into the 
     * local reference _systemConfig
     */
    private void loadSystemConfig() {
        _logger.write(this.toString(), Logger.SYSMSG, "reloading " + _systemConfigFile);
        // get a reference to the system config and store it
        try {
            // create the properties for the configuration
            File systemConfigFile = new File(_configPath, _systemConfigFile);
            _systemConfigHolder = new Properties();
            _systemConfigHolder.load(new FileInputStream(systemConfigFile));
            
            // create the servant
            ConfigurationServant ref = new ConfigurationServant(_systemConfigHolder, _systemConfigFile, systemConfigFile.lastModified());
            org.omg.CORBA.Object objRef = _refman.getRootPOA().servant_to_reference(ref);
            
            // narrow it to a Configuration
            _systemConfig = ConfigurationHelper.narrow(objRef);
            
        } catch (Exception e) {
            _logger.write(toString(), Logger.FATAL, "ERROR: " + e.getMessage());
        }
    }

    /**
     * Parses the system configuration file
     * for group membership entries.
     *
     * It looks for all entries of group.<name>
     * which contain the given source name
     *
     * @param source the source to find membership for
     *
     * @return the list of groups that this source is a member of
     */
    private LinkedList getGroupMembership(String source) {
        LinkedList groupMembership = new LinkedList();        
        Iterator i = new TreeSet(_systemConfigHolder.keySet()).iterator();
        while(i.hasNext()) {
            String key = (String) i.next();
            if (key.startsWith("group.")) {
                String group = _systemConfig.getProperty(key);
                if (group.indexOf(source) != -1) {
                    groupMembership.add(key.substring(6));
                }
            }   
        }
        return groupMembership;
    }    

    /**
     * Build the properties as a Configuration to be 
     * returned to the caller
     *
     * @param fileList the list of files to build the configuration from
     *
     * @return the built Configuration
     */
    private Configuration buildConfiguration(String fileList) {
        Configuration config = null;

        // if there is an entry
        if (!fileList.equals("")) {
            try {
                
                // build the properites here from the filelist.... 
                StringTokenizer st = new StringTokenizer(fileList, ";");
                
                // some holders for variables
                File currentFile;
                long lastModified, newLastModified;
                Properties properties, prevProperties;
                
                // the root of all configurations will be the system config
                // so we need to open the properties of that
                Properties defaultProperties = new Properties();
                currentFile = new File(_configPath, _systemConfigFile);
                lastModified = currentFile.lastModified();
                defaultProperties.load(new FileInputStream(currentFile));
                
                // This loop then iterates over the file list
                // creates the properties to be passed to the
                // Configuration constructor
                do {
                    properties = new Properties(defaultProperties);
                    currentFile = new File(_configPath, st.nextToken());
                    newLastModified = currentFile.lastModified();
                    if (newLastModified > lastModified) {
                        lastModified = newLastModified;
                    }
                    properties.load(new FileInputStream(currentFile));
                    defaultProperties = properties;
                } while (st.hasMoreTokens());

                // this creates the configuration, all nice, ready to be returned
                ConfigurationServant ref = new ConfigurationServant(properties, fileList, lastModified);
                org.omg.CORBA.Object objRef = _refman.getRootPOA().servant_to_reference(ref);
                config = ConfigurationHelper.narrow(objRef);

            } catch (Exception e) {
                // not sure what to do here
                // so we just log the error
                _logger.write(toString(), Logger.ERROR, "ERROR - " + e);
            }
            
        // if there isn't an entry for the requested config
        } else {
            _logger.write(toString(), Logger.DEBUG, "no configured config, returning " + _systemConfigFile);
            config = _systemConfig;
        }
        return config;
    }

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

//---ATTRIBUTES---

    /**
     * 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 = Core.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();
    
    /**
     * The root path to all configurations
     */
    private String _configPath;
    
    /**
     * The name of the file that contains the system configuration
     */
    private String _systemConfigFile;
    
    /**
     * An instance of the system config
     */
    private Configuration _systemConfig;
    
    /**
     * The system config file represented by a
     * properties object.
     */
    private Properties _systemConfigHolder;
    
//---STATIC ATTRIBUTES---
    
}
Revision:	1.12
Committed:	Thu Mar 1 20:22:21 2001 UTC (24 years, 7 months ago) by tdb
Branch:	MAIN
Changes since 1.11:	+3 -2 lines
Log Message:	Opps, missing } !
#	Content
1	//---PACKAGE DECLARATION---
2	package uk.ac.ukc.iscream.core;
3
4	//---IMPORTS---
5	import uk.ac.ukc.iscream.util.*;
6	import uk.ac.ukc.iscream.componentmanager.*;
7	import java.util.*;
8	import java.io.*;
9
10	/**
11	* This class is essentially a Configuration factory.
12	* This class implements the Configurator IDL and allows
13	* other classes in the system ot obtain their Configuration
14	*
15	* On construction it requires a reference to the RootPOA
16	* to allow it to create Configuration objects to be
17	* returned.
18	*
19	* It also relies on the System.properties to set internal values.
20	*
21	* ###
22	* A point to note is that this class does NOT yet manage
23	* created configurations which may cause memory problems!
24	* ###
25	*
26	* @author $Author: ajm4 $
27	* @version $Id: ConfigurationManagerServant.java,v 1.11 2001/03/01 19:42:20 ajm4 Exp $
28	*/
29	class ConfigurationManagerServant extends ConfigurationManagerPOA {
30
31	//---FINAL ATTRIBUTES---
32
33	/**
34	* The current CVS revision of this class
35	*/
36	public final String REVISION = "$Revision: 1.11 $";
37
38	//---STATIC METHODS---
39
40	//---CONSTRUCTORS---
41
42	/**
43	* Creates a new ConfiguratorServant
44	* This class uses the System.properties to set internal values
45	*/
46	ConfigurationManagerServant() {
47	// assign some local variables
48	_configPath = System.getProperty("uk.ac.ukc.iscream.ConfigurationLocation");
49	_systemConfigFile = System.getProperty("uk.ac.ukc.iscream.SystemConfigurationFile");
50
51	// load the system config
52	loadSystemConfig();
53
54	// log our status
55	_logger.write(toString(), Logger.SYSINIT, "started");
56	_logger.write(toString(), Logger.SYSMSG, "configuration location - " + _configPath);
57	_logger.write(toString(), Logger.SYSMSG, "system configuration file - " + _systemConfigFile);
58	}
59
60	//---PUBLIC METHODS---
61
62	/**
63	* Returns a Configuration object which contains
64	* the configuration data requested by the calling
65	* object.
66	*
67	* This method will look in the systemConfig file
68	* for an entry for this "source", if there is no
69	* entry it returns a refernce to the system
70	* config. If there are any errors in reading the
71	* configuration, it returns null, the caller is
72	* expected to be able to handle this.
73	*
74	* This method also checks to see if the system.conf
75	* file has been updated and reloads its reference if
76	* needed.
77	*
78	* @param source the configuration required
79	* @return the Configuration
80	*/
81	public Configuration getConfiguration(String source) {
82	_logger.write(toString(), Logger.SYSMSG, "got request for " + source);
83
84
85	// check to see if we need to reload the system config
86	// because it has changed
87	if (isModified(_systemConfig.getFileList(), _systemConfig.getLastModified())) {
88	_logger.write(toString(), Logger.SYSMSG, "system config changed");
89	loadSystemConfig();
90	}
91
92	// search config for group membership
93	LinkedList groups = getGroupMembership(source);
94
95	// add the hosts individual config to the start of the list
96	groups.addFirst(source);
97
98	Iterator i = groups.iterator();
99	String fileList = "";
100	while (i.hasNext()) {
101	String groupName = (String) i.next();
102	_logger.write(toString(), Logger.DEBUG, "looking for config entry for - " + groupName);
103	// we look for this entry in the systemConfig
104	String configFile = _systemConfig.getProperty("config." + groupName);
105	// if there is a config entry then
106	if (configFile != null) {
107	_logger.write(toString(), Logger.DEBUG, "looking for config tree in - " + configFile);
108
109	// get the file list of includes etc + the system config
110	String groupFileList = null;
111	try {
112	groupFileList = getIncludedFiles(configFile, "") + ";";
113	} catch (Exception e) {
114	// not sure what to do here
115	// so we just log the error
116	_logger.write(toString(), Logger.ERROR, "ERROR - " + e);
117	}
118	if (groupFileList != null) {
119	fileList += groupFileList;
120	}
121	} else {
122	_logger.write(toString(), Logger.DEBUG, "no config entry for - " + groupName);
123	}
124	}
125	// add the system config as the final check
126	fileList += _systemConfigFile + ";";
127	_logger.write(toString(), Logger.DEBUG, "config tree - " + fileList);
128
129	// build the configuration
130	Configuration config = buildConfiguration(fileList);
131
132	// if this is null at this point, then there will have been an error
133	return config;
134	}
135
136
137	/**
138	* When passed a file list and a current value for the lastModified
139	* of the current configuration, this method compares the value
140	* to the actual value of the configuration files to determine
141	* whether or not the configuration has been modified.
142	*
143	* @param fileList a list of files that the caller uses for configuration
144	* @param lastModified the last modified date of the callers configuration
145	*
146	* @return whether or not the configuration has been modified
147	*/
148	public boolean isModified(String fileList, long lastModified) {
149	StringTokenizer st = new StringTokenizer(fileList, ";");
150	long newLastModified;
151	File currentFile;
152	while (st.hasMoreTokens()) {
153	currentFile = new File(_configPath, st.nextToken());
154	newLastModified = currentFile.lastModified();
155	if (newLastModified > lastModified) {
156	return true;
157	}
158	}
159	return false;
160	}
161
162	/**
163	* Overrides the {@link java.lang.Object#toString() Object.toString()}
164	* method to provide clean logging (every class should have this).
165	*
166	* This uses the uk.ac.ukc.iscream.util.FormatName class
167	* to format the toString()
168	*
169	* @return the name of this class and its CVS revision
170	*/
171	public String toString() {
172	return FormatName.getName(
173	_name,
174	getClass().getName(),
175	REVISION);
176	}
177
178	//---PRIVATE METHODS---
179
180	/**
181	* This is a recursive function private to this class.
182	* It constructs a hierarchy of files as a ";" serperated
183	* string which can be used to read in the configuration.
184	* This function calls itself.
185	*
186	* @param currentFile the current file to be processed
187	* @param readFiles used for recursion purposes only, these are the files it has read so far
188	*
189	* @return the current list that has been constructed
190	*
191	* @throws IOException if there is trouble reading the file
192	* @throws FileNotFoundException is there is trouble finding the file
193	* @throws CircularIncludeException this is if a circular include is detected
194	*/
195	private String getIncludedFiles(String currentFile, String readFiles) throws IOException, FileNotFoundException, Exception {
196
197	// check for circular include here
198	if (hasDuplicate(currentFile, readFiles) \|\| currentFile.equals(_systemConfigFile)) {
199	throw new CircularIncludeException(currentFile + " is included more than once");
200	}
201
202	// if there wasn't, we're gonna use this file, so make a note of it as read
203	// (note the use of the ";", this is for the hasDuplicate, function)
204	readFiles = readFiles + currentFile + ";";
205
206	Properties properties = new Properties();
207	properties.load(new FileInputStream(new File(_configPath, currentFile)));
208
209	// get the include property
210	String includes = properties.getProperty("include");
211
212	// if we're the last file with no includes, return our name
213	if (includes == null) {
214	return currentFile;
215
216	// otherwise, recurse over our includes
217	} else {
218	StringTokenizer st = new StringTokenizer(includes, ";");
219	String returnList= "";
220	while (st.hasMoreTokens()) {
221	returnList = getIncludedFiles(st.nextToken(), readFiles) + ";" + returnList;
222	}
223
224	return returnList + currentFile;
225	}
226	}
227
228	/**
229	* This simple method checks to see if a given
230	* file exists in the given list.
231	*
232	* @param file the file to check the list for
233	* @param fileList the list to check
234	*
235	* @return if the given file appeard in the list
236	*/
237	private boolean hasDuplicate(String file, String fileList) {
238	StringTokenizer st = new StringTokenizer(fileList, ";");
239	while (st.hasMoreTokens()) {
240	if (file.equals(st.nextToken())) {
241	return true;
242	}
243	}
244	return false;
245	}
246
247	/**
248	* Opens and loads the system configuration into the
249	* local reference _systemConfig
250	*/
251	private void loadSystemConfig() {
252	_logger.write(this.toString(), Logger.SYSMSG, "reloading " + _systemConfigFile);
253	// get a reference to the system config and store it
254	try {
255	// create the properties for the configuration
256	File systemConfigFile = new File(_configPath, _systemConfigFile);
257	_systemConfigHolder = new Properties();
258	_systemConfigHolder.load(new FileInputStream(systemConfigFile));
259
260	// create the servant
261	ConfigurationServant ref = new ConfigurationServant(_systemConfigHolder, _systemConfigFile, systemConfigFile.lastModified());
262	org.omg.CORBA.Object objRef = _refman.getRootPOA().servant_to_reference(ref);
263
264	// narrow it to a Configuration
265	_systemConfig = ConfigurationHelper.narrow(objRef);
266
267	} catch (Exception e) {
268	_logger.write(toString(), Logger.FATAL, "ERROR: " + e.getMessage());
269	}
270	}
271
272	/**
273	* Parses the system configuration file
274	* for group membership entries.
275	*
276	* It looks for all entries of group.<name>
277	* which contain the given source name
278	*
279	* @param source the source to find membership for
280	*
281	* @return the list of groups that this source is a member of
282	*/
283	private LinkedList getGroupMembership(String source) {
284	LinkedList groupMembership = new LinkedList();
285	Iterator i = new TreeSet(_systemConfigHolder.keySet()).iterator();
286	while(i.hasNext()) {
287	String key = (String) i.next();
288	if (key.startsWith("group.")) {
289	String group = _systemConfig.getProperty(key);
290	if (group.indexOf(source) != -1) {
291	groupMembership.add(key.substring(6));
292	}
293	}
294	}
295	return groupMembership;
296	}
297
298	/**
299	* Build the properties as a Configuration to be
300	* returned to the caller
301	*
302	* @param fileList the list of files to build the configuration from
303	*
304	* @return the built Configuration
305	*/
306	private Configuration buildConfiguration(String fileList) {
307	Configuration config = null;
308
309	// if there is an entry
310	if (!fileList.equals("")) {
311	try {
312
313	// build the properites here from the filelist....
314	StringTokenizer st = new StringTokenizer(fileList, ";");
315
316	// some holders for variables
317	File currentFile;
318	long lastModified, newLastModified;
319	Properties properties, prevProperties;
320
321	// the root of all configurations will be the system config
322	// so we need to open the properties of that
323	Properties defaultProperties = new Properties();
324	currentFile = new File(_configPath, _systemConfigFile);
325	lastModified = currentFile.lastModified();
326	defaultProperties.load(new FileInputStream(currentFile));
327
328	// This loop then iterates over the file list
329	// creates the properties to be passed to the
330	// Configuration constructor
331	do {
332	properties = new Properties(defaultProperties);
333	currentFile = new File(_configPath, st.nextToken());
334	newLastModified = currentFile.lastModified();
335	if (newLastModified > lastModified) {
336	lastModified = newLastModified;
337	}
338	properties.load(new FileInputStream(currentFile));
339	defaultProperties = properties;
340	} while (st.hasMoreTokens());
341
342	// this creates the configuration, all nice, ready to be returned
343	ConfigurationServant ref = new ConfigurationServant(properties, fileList, lastModified);
344	org.omg.CORBA.Object objRef = _refman.getRootPOA().servant_to_reference(ref);
345	config = ConfigurationHelper.narrow(objRef);
346
347	} catch (Exception e) {
348	// not sure what to do here
349	// so we just log the error
350	_logger.write(toString(), Logger.ERROR, "ERROR - " + e);
351	}
352
353	// if there isn't an entry for the requested config
354	} else {
355	_logger.write(toString(), Logger.DEBUG, "no configured config, returning " + _systemConfigFile);
356	config = _systemConfig;
357	}
358	return config;
359	}
360
361	//---ACCESSOR/MUTATOR METHODS---
362
363	//---ATTRIBUTES---
364
365	/**
366	* This is the friendly identifier of the
367	* component this class is running in.
368	* eg, a Filter may be called "filter1",
369	* If this class does not have an owning
370	* component, a name from the configuration
371	* can be placed here. This name could also
372	* be changed to null for utility classes.
373	*/
374	private String _name = Core.NAME;
375
376	/**
377	* This holds a reference to the
378	* system logger that is being used.
379	*/
380	private Logger _logger = ReferenceManager.getInstance().getLogger();
381
382	/**
383	* A reference to the reference manager in use
384	*/
385	private ReferenceManager _refman = ReferenceManager.getInstance();
386
387	/**
388	* The root path to all configurations
389	*/
390	private String _configPath;
391
392	/**
393	* The name of the file that contains the system configuration
394	*/
395	private String _systemConfigFile;
396
397	/**
398	* An instance of the system config
399	*/
400	private Configuration _systemConfig;
401
402	/**
403	* The system config file represented by a
404	* properties object.
405	*/
406	private Properties _systemConfigHolder;
407
408	//---STATIC ATTRIBUTES---
409
410	}