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: tdb1 $
 * @version $Id: ConfigurationManagerServant.java,v 1.12 2001/03/01 20:22:21 tdb1 Exp $
 */
class ConfigurationManagerServant extends ConfigurationManagerPOA {

//---FINAL ATTRIBUTES---

    /**
     * The current CVS revision of this class
     */
    public final String REVISION = "$Revision: 1.12 $";
    
//---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 + ";" + fileList;
        _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 = 0;
                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();
                
                // This loop then iterates over the file list
                // creates the properties to be passed to the
                // Configuration constructor
                while (st.hasMoreTokens()) {
                    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;
                }

                // 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);
                _logger.write(toString(), Logger.DEBUG, "returning built configuration");
            } 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:	1.13
Committed:	Thu Mar 1 21:06:58 2001 UTC (23 years, 2 months ago) by tdb
Branch:	MAIN
Changes since 1.12:	+8 -11 lines
Log Message:	Restructed the build configuration routine to include files in the correct order
#	User	Rev	Content
1	ajm	1.3	//---PACKAGE DECLARATION---
2	ajm	1.5	package uk.ac.ukc.iscream.core;
3	ajm	1.3
4			//---IMPORTS---
5	ajm	1.6	import uk.ac.ukc.iscream.util.*;
6	tdb	1.7	import uk.ac.ukc.iscream.componentmanager.*;
7	ajm	1.3	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	ajm	1.6	* ###
22			* A point to note is that this class does NOT yet manage
23			* created configurations which may cause memory problems!
24			* ###
25			*
26	tdb	1.13	* @author $Author: tdb1 $
27			* @version $Id: ConfigurationManagerServant.java,v 1.12 2001/03/01 20:22:21 tdb1 Exp $
28	ajm	1.3	*/
29			class ConfigurationManagerServant extends ConfigurationManagerPOA {
30
31			//---FINAL ATTRIBUTES---
32
33			/**
34			* The current CVS revision of this class
35			*/
36	tdb	1.13	public final String REVISION = "$Revision: 1.12 $";
37	ajm	1.3
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	ajm	1.6	ConfigurationManagerServant() {
47	ajm	1.3	// 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	ajm	1.6	_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	ajm	1.3	}
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	ajm	1.6	_logger.write(toString(), Logger.SYSMSG, "got request for " + source);
83	ajm	1.8
84	ajm	1.3
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	ajm	1.6	_logger.write(toString(), Logger.SYSMSG, "system config changed");
89	ajm	1.3	loadSystemConfig();
90			}
91
92	ajm	1.8	// search config for group membership
93			LinkedList groups = getGroupMembership(source);
94	ajm	1.3
95	ajm	1.8	// add the hosts individual config to the start of the list
96			groups.addFirst(source);
97	ajm	1.3
98	ajm	1.8	Iterator i = groups.iterator();
99			String fileList = "";
100			while (i.hasNext()) {
101			String groupName = (String) i.next();
102	ajm	1.11	_logger.write(toString(), Logger.DEBUG, "looking for config entry for - " + groupName);
103	ajm	1.8	// we look for this entry in the systemConfig
104			String configFile = _systemConfig.getProperty("config." + groupName);
105	ajm	1.11	// 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	tdb	1.12	}
124	ajm	1.3	}
125	ajm	1.8	// add the system config as the final check
126	tdb	1.13	fileList = _systemConfigFile + ";" + fileList;
127	ajm	1.8	_logger.write(toString(), Logger.DEBUG, "config tree - " + fileList);
128
129			// build the configuration
130			Configuration config = buildConfiguration(fileList);
131	ajm	1.3
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	ajm	1.6
162	ajm	1.3	/**
163			* Overrides the {@link java.lang.Object#toString() Object.toString()}
164			* method to provide clean logging (every class should have this).
165			*
166	ajm	1.6	* This uses the uk.ac.ukc.iscream.util.FormatName class
167			* to format the toString()
168			*
169	ajm	1.3	* @return the name of this class and its CVS revision
170			*/
171			public String toString() {
172	ajm	1.6	return FormatName.getName(
173			_name,
174			getClass().getName(),
175			REVISION);
176	ajm	1.3	}
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	ajm	1.4	* @param readFiles used for recursion purposes only, these are the files it has read so far
188			*
189	ajm	1.3	* @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	ajm	1.4	* @throws CircularIncludeException this is if a circular include is detected
194	ajm	1.3	*/
195	ajm	1.4	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	ajm	1.3	Properties properties = new Properties();
207			properties.load(new FileInputStream(new File(_configPath, currentFile)));
208	ajm	1.4
209			// get the include property
210	ajm	1.3	String includes = properties.getProperty("include");
211	ajm	1.4
212			// if we're the last file with no includes, return our name
213	ajm	1.3	if (includes == null) {
214			return currentFile;
215	ajm	1.4
216			// otherwise, recurse over our includes
217	ajm	1.3	} else {
218			StringTokenizer st = new StringTokenizer(includes, ";");
219			String returnList= "";
220			while (st.hasMoreTokens()) {
221	ajm	1.4	returnList = getIncludedFiles(st.nextToken(), readFiles) + ";" + returnList;
222	ajm	1.3	}
223	ajm	1.4
224	ajm	1.3	return returnList + currentFile;
225			}
226			}
227
228			/**
229	ajm	1.4	* 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	ajm	1.3	* Opens and loads the system configuration into the
249			* local reference _systemConfig
250			*/
251			private void loadSystemConfig() {
252	ajm	1.6	_logger.write(this.toString(), Logger.SYSMSG, "reloading " + _systemConfigFile);
253	ajm	1.3	// 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	ajm	1.8	_systemConfigHolder = new Properties();
258			_systemConfigHolder.load(new FileInputStream(systemConfigFile));
259
260	ajm	1.3	// create the servant
261	ajm	1.8	ConfigurationServant ref = new ConfigurationServant(_systemConfigHolder, _systemConfigFile, systemConfigFile.lastModified());
262	ajm	1.6	org.omg.CORBA.Object objRef = _refman.getRootPOA().servant_to_reference(ref);
263	ajm	1.3
264			// narrow it to a Configuration
265			_systemConfig = ConfigurationHelper.narrow(objRef);
266
267			} catch (Exception e) {
268	ajm	1.6	_logger.write(toString(), Logger.FATAL, "ERROR: " + e.getMessage());
269	ajm	1.3	}
270			}
271
272	ajm	1.8	/**
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	ajm	1.10	if (!fileList.equals("")) {
311	ajm	1.8	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	tdb	1.13	long lastModified, newLastModified = 0;
319	ajm	1.8	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
325			// This loop then iterates over the file list
326			// creates the properties to be passed to the
327			// Configuration constructor
328	tdb	1.13	while (st.hasMoreTokens()) {
329	ajm	1.8	properties = new Properties(defaultProperties);
330			currentFile = new File(_configPath, st.nextToken());
331			newLastModified = currentFile.lastModified();
332			if (newLastModified > lastModified) {
333			lastModified = newLastModified;
334			}
335			properties.load(new FileInputStream(currentFile));
336			defaultProperties = properties;
337	tdb	1.13	}
338	ajm	1.8
339			// this creates the configuration, all nice, ready to be returned
340			ConfigurationServant ref = new ConfigurationServant(properties, fileList, lastModified);
341			org.omg.CORBA.Object objRef = _refman.getRootPOA().servant_to_reference(ref);
342			config = ConfigurationHelper.narrow(objRef);
343	tdb	1.13	_logger.write(toString(), Logger.DEBUG, "returning built configuration");
344	ajm	1.8	} catch (Exception e) {
345			// not sure what to do here
346			// so we just log the error
347	ajm	1.10	_logger.write(toString(), Logger.ERROR, "ERROR - " + e);
348	ajm	1.8	}
349
350			// if there isn't an entry for the requested config
351			} else {
352			_logger.write(toString(), Logger.DEBUG, "no configured config, returning " + _systemConfigFile);
353			config = _systemConfig;
354			}
355			return config;
356			}
357
358	ajm	1.3	//---ACCESSOR/MUTATOR METHODS---
359
360			//---ATTRIBUTES---
361
362			/**
363	ajm	1.6	* This is the friendly identifier of the
364			* component this class is running in.
365			* eg, a Filter may be called "filter1",
366			* If this class does not have an owning
367			* component, a name from the configuration
368			* can be placed here. This name could also
369			* be changed to null for utility classes.
370			*/
371			private String _name = Core.NAME;
372
373			/**
374			* This holds a reference to the
375			* system logger that is being used.
376	ajm	1.3	*/
377	ajm	1.6	private Logger _logger = ReferenceManager.getInstance().getLogger();
378	ajm	1.3
379			/**
380	ajm	1.6	* A reference to the reference manager in use
381	ajm	1.3	*/
382	ajm	1.6	private ReferenceManager _refman = ReferenceManager.getInstance();
383	ajm	1.3
384			/**
385			* The root path to all configurations
386			*/
387			private String _configPath;
388
389			/**
390			* The name of the file that contains the system configuration
391			*/
392			private String _systemConfigFile;
393
394			/**
395			* An instance of the system config
396			*/
397			private Configuration _systemConfig;
398	ajm	1.8
399			/**
400			* The system config file represented by a
401			* properties object.
402			*/
403			private Properties _systemConfigHolder;
404	ajm	1.3
405			//---STATIC ATTRIBUTES---
406
407			}