1 |
ajm |
1.3 |
//---PACKAGE DECLARATION--- |
2 |
ajm |
1.5 |
package uk.ac.ukc.iscream.core; |
3 |
ajm |
1.3 |
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4 |
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//---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.*; |
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import java.io.*; |
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/** |
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* This class is essentially a Configuration factory. |
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* This class implements the Configurator IDL and allows |
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* other classes in the system ot obtain their Configuration |
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* |
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* On construction it requires a reference to the RootPOA |
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* to allow it to create Configuration objects to be |
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* returned. |
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* |
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* It also relies on the System.properties to set internal values. |
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* |
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ajm |
1.6 |
* ### |
22 |
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* A point to note is that this class does NOT yet manage |
23 |
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* created configurations which may cause memory problems! |
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* ### |
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* |
26 |
ajm |
1.9 |
* @author $Author: ajm4 $ |
27 |
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* @version $Id: ConfigurationManagerServant.java,v 1.8 2001/03/01 19:18:38 ajm4 Exp $ |
28 |
ajm |
1.3 |
*/ |
29 |
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class ConfigurationManagerServant extends ConfigurationManagerPOA { |
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//---FINAL ATTRIBUTES--- |
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/** |
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* The current CVS revision of this class |
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*/ |
36 |
ajm |
1.9 |
public final String REVISION = "$Revision: 1.8 $"; |
37 |
ajm |
1.3 |
|
38 |
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//---STATIC METHODS--- |
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40 |
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//---CONSTRUCTORS--- |
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/** |
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* Creates a new ConfiguratorServant |
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* This class uses the System.properties to set internal values |
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*/ |
46 |
ajm |
1.6 |
ConfigurationManagerServant() { |
47 |
ajm |
1.3 |
// assign some local variables |
48 |
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_configPath = System.getProperty("uk.ac.ukc.iscream.ConfigurationLocation"); |
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_systemConfigFile = System.getProperty("uk.ac.ukc.iscream.SystemConfigurationFile"); |
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// load the system config |
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loadSystemConfig(); |
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// log our status |
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ajm |
1.6 |
_logger.write(toString(), Logger.SYSINIT, "started"); |
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_logger.write(toString(), Logger.SYSMSG, "configuration location - " + _configPath); |
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_logger.write(toString(), Logger.SYSMSG, "system configuration file - " + _systemConfigFile); |
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ajm |
1.3 |
} |
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//---PUBLIC METHODS--- |
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/** |
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* Returns a Configuration object which contains |
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* the configuration data requested by the calling |
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* object. |
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* |
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* This method will look in the systemConfig file |
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* for an entry for this "source", if there is no |
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* entry it returns a refernce to the system |
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* config. If there are any errors in reading the |
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* configuration, it returns null, the caller is |
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* expected to be able to handle this. |
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* |
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* This method also checks to see if the system.conf |
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* file has been updated and reloads its reference if |
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* needed. |
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* |
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* @param source the configuration required |
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* @return the Configuration |
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*/ |
81 |
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public Configuration getConfiguration(String source) { |
82 |
ajm |
1.6 |
_logger.write(toString(), Logger.SYSMSG, "got request for " + source); |
83 |
ajm |
1.8 |
|
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ajm |
1.3 |
|
85 |
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// check to see if we need to reload the system config |
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// because it has changed |
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if (isModified(_systemConfig.getFileList(), _systemConfig.getLastModified())) { |
88 |
ajm |
1.6 |
_logger.write(toString(), Logger.SYSMSG, "system config changed"); |
89 |
ajm |
1.3 |
loadSystemConfig(); |
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} |
91 |
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92 |
ajm |
1.8 |
// search config for group membership |
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LinkedList groups = getGroupMembership(source); |
94 |
ajm |
1.3 |
|
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ajm |
1.8 |
// add the hosts individual config to the start of the list |
96 |
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groups.addFirst(source); |
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ajm |
1.3 |
|
98 |
ajm |
1.8 |
Iterator i = groups.iterator(); |
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String fileList = ""; |
100 |
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while (i.hasNext()) { |
101 |
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String groupName = (String) i.next(); |
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// we look for this entry in the systemConfig |
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String configFile = _systemConfig.getProperty("config." + groupName); |
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_logger.write(toString(), Logger.DEBUG, "looking for config tree in - " + configFile); |
106 |
ajm |
1.3 |
|
107 |
ajm |
1.8 |
// get the file list of includes etc + the system config |
108 |
ajm |
1.10 |
String groupFileList = null; |
109 |
ajm |
1.8 |
try { |
110 |
ajm |
1.10 |
groupFileList = getIncludedFiles(configFile, "") + ";"; |
111 |
ajm |
1.3 |
} catch (Exception e) { |
112 |
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// not sure what to do here |
113 |
ajm |
1.6 |
// so we just log the error |
114 |
ajm |
1.10 |
_logger.write(toString(), Logger.ERROR, "ERROR - " + e); |
115 |
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} |
116 |
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if (groupFileList != null) { |
117 |
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fileList += groupFileList; |
118 |
ajm |
1.3 |
} |
119 |
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} |
120 |
ajm |
1.8 |
// add the system config as the final check |
121 |
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fileList += _systemConfigFile + ";"; |
122 |
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_logger.write(toString(), Logger.DEBUG, "config tree - " + fileList); |
123 |
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124 |
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// build the configuration |
125 |
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Configuration config = buildConfiguration(fileList); |
126 |
ajm |
1.3 |
|
127 |
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// if this is null at this point, then there will have been an error |
128 |
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return config; |
129 |
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} |
130 |
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131 |
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132 |
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/** |
133 |
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* When passed a file list and a current value for the lastModified |
134 |
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* of the current configuration, this method compares the value |
135 |
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* to the actual value of the configuration files to determine |
136 |
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* whether or not the configuration has been modified. |
137 |
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* |
138 |
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* @param fileList a list of files that the caller uses for configuration |
139 |
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* @param lastModified the last modified date of the callers configuration |
140 |
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* |
141 |
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* @return whether or not the configuration has been modified |
142 |
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*/ |
143 |
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public boolean isModified(String fileList, long lastModified) { |
144 |
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StringTokenizer st = new StringTokenizer(fileList, ";"); |
145 |
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long newLastModified; |
146 |
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File currentFile; |
147 |
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while (st.hasMoreTokens()) { |
148 |
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currentFile = new File(_configPath, st.nextToken()); |
149 |
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newLastModified = currentFile.lastModified(); |
150 |
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if (newLastModified > lastModified) { |
151 |
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return true; |
152 |
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} |
153 |
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} |
154 |
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return false; |
155 |
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} |
156 |
ajm |
1.6 |
|
157 |
ajm |
1.3 |
/** |
158 |
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* Overrides the {@link java.lang.Object#toString() Object.toString()} |
159 |
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* method to provide clean logging (every class should have this). |
160 |
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* |
161 |
ajm |
1.6 |
* This uses the uk.ac.ukc.iscream.util.FormatName class |
162 |
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* to format the toString() |
163 |
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* |
164 |
ajm |
1.3 |
* @return the name of this class and its CVS revision |
165 |
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*/ |
166 |
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public String toString() { |
167 |
ajm |
1.6 |
return FormatName.getName( |
168 |
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_name, |
169 |
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getClass().getName(), |
170 |
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REVISION); |
171 |
ajm |
1.3 |
} |
172 |
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173 |
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//---PRIVATE METHODS--- |
174 |
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175 |
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/** |
176 |
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* This is a recursive function private to this class. |
177 |
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* It constructs a hierarchy of files as a ";" serperated |
178 |
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* string which can be used to read in the configuration. |
179 |
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* This function calls itself. |
180 |
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* |
181 |
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* @param currentFile the current file to be processed |
182 |
ajm |
1.4 |
* @param readFiles used for recursion purposes only, these are the files it has read so far |
183 |
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* |
184 |
ajm |
1.3 |
* @return the current list that has been constructed |
185 |
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* |
186 |
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* @throws IOException if there is trouble reading the file |
187 |
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* @throws FileNotFoundException is there is trouble finding the file |
188 |
ajm |
1.4 |
* @throws CircularIncludeException this is if a circular include is detected |
189 |
ajm |
1.3 |
*/ |
190 |
ajm |
1.4 |
private String getIncludedFiles(String currentFile, String readFiles) throws IOException, FileNotFoundException, Exception { |
191 |
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192 |
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// check for circular include here |
193 |
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if (hasDuplicate(currentFile, readFiles) || currentFile.equals(_systemConfigFile)) { |
194 |
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throw new CircularIncludeException(currentFile + " is included more than once"); |
195 |
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} |
196 |
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197 |
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// if there wasn't, we're gonna use this file, so make a note of it as read |
198 |
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// (note the use of the ";", this is for the hasDuplicate, function) |
199 |
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readFiles = readFiles + currentFile + ";"; |
200 |
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201 |
ajm |
1.3 |
Properties properties = new Properties(); |
202 |
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properties.load(new FileInputStream(new File(_configPath, currentFile))); |
203 |
ajm |
1.4 |
|
204 |
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// get the include property |
205 |
ajm |
1.3 |
String includes = properties.getProperty("include"); |
206 |
ajm |
1.4 |
|
207 |
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// if we're the last file with no includes, return our name |
208 |
ajm |
1.3 |
if (includes == null) { |
209 |
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return currentFile; |
210 |
ajm |
1.4 |
|
211 |
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// otherwise, recurse over our includes |
212 |
ajm |
1.3 |
} else { |
213 |
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StringTokenizer st = new StringTokenizer(includes, ";"); |
214 |
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String returnList= ""; |
215 |
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while (st.hasMoreTokens()) { |
216 |
ajm |
1.4 |
returnList = getIncludedFiles(st.nextToken(), readFiles) + ";" + returnList; |
217 |
ajm |
1.3 |
} |
218 |
ajm |
1.4 |
|
219 |
ajm |
1.3 |
return returnList + currentFile; |
220 |
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} |
221 |
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} |
222 |
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223 |
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/** |
224 |
ajm |
1.4 |
* This simple method checks to see if a given |
225 |
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* file exists in the given list. |
226 |
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* |
227 |
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* @param file the file to check the list for |
228 |
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* @param fileList the list to check |
229 |
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* |
230 |
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* @return if the given file appeard in the list |
231 |
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*/ |
232 |
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private boolean hasDuplicate(String file, String fileList) { |
233 |
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StringTokenizer st = new StringTokenizer(fileList, ";"); |
234 |
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while (st.hasMoreTokens()) { |
235 |
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if (file.equals(st.nextToken())) { |
236 |
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return true; |
237 |
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} |
238 |
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} |
239 |
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return false; |
240 |
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} |
241 |
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242 |
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/** |
243 |
ajm |
1.3 |
* Opens and loads the system configuration into the |
244 |
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* local reference _systemConfig |
245 |
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*/ |
246 |
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private void loadSystemConfig() { |
247 |
ajm |
1.6 |
_logger.write(this.toString(), Logger.SYSMSG, "reloading " + _systemConfigFile); |
248 |
ajm |
1.3 |
// get a reference to the system config and store it |
249 |
|
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try { |
250 |
|
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// create the properties for the configuration |
251 |
|
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File systemConfigFile = new File(_configPath, _systemConfigFile); |
252 |
ajm |
1.8 |
_systemConfigHolder = new Properties(); |
253 |
|
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_systemConfigHolder.load(new FileInputStream(systemConfigFile)); |
254 |
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|
255 |
ajm |
1.3 |
// create the servant |
256 |
ajm |
1.8 |
ConfigurationServant ref = new ConfigurationServant(_systemConfigHolder, _systemConfigFile, systemConfigFile.lastModified()); |
257 |
ajm |
1.6 |
org.omg.CORBA.Object objRef = _refman.getRootPOA().servant_to_reference(ref); |
258 |
ajm |
1.3 |
|
259 |
|
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// narrow it to a Configuration |
260 |
|
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_systemConfig = ConfigurationHelper.narrow(objRef); |
261 |
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262 |
|
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} catch (Exception e) { |
263 |
ajm |
1.6 |
_logger.write(toString(), Logger.FATAL, "ERROR: " + e.getMessage()); |
264 |
ajm |
1.3 |
} |
265 |
|
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} |
266 |
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|
267 |
ajm |
1.8 |
/** |
268 |
|
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* Parses the system configuration file |
269 |
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* for group membership entries. |
270 |
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* |
271 |
|
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* It looks for all entries of group.<name> |
272 |
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* which contain the given source name |
273 |
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* |
274 |
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* @param source the source to find membership for |
275 |
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* |
276 |
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* @return the list of groups that this source is a member of |
277 |
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*/ |
278 |
|
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private LinkedList getGroupMembership(String source) { |
279 |
|
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LinkedList groupMembership = new LinkedList(); |
280 |
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Iterator i = new TreeSet(_systemConfigHolder.keySet()).iterator(); |
281 |
|
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while(i.hasNext()) { |
282 |
|
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String key = (String) i.next(); |
283 |
|
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if (key.startsWith("group.")) { |
284 |
|
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String group = _systemConfig.getProperty(key); |
285 |
|
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if (group.indexOf(source) != -1) { |
286 |
|
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groupMembership.add(key.substring(6)); |
287 |
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} |
288 |
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} |
289 |
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} |
290 |
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return groupMembership; |
291 |
|
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} |
292 |
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|
293 |
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/** |
294 |
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* Build the properties as a Configuration to be |
295 |
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* returned to the caller |
296 |
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* |
297 |
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* @param fileList the list of files to build the configuration from |
298 |
|
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* |
299 |
|
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* @return the built Configuration |
300 |
|
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*/ |
301 |
|
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private Configuration buildConfiguration(String fileList) { |
302 |
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Configuration config = null; |
303 |
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|
304 |
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// if there is an entry |
305 |
ajm |
1.10 |
if (!fileList.equals("")) { |
306 |
ajm |
1.8 |
try { |
307 |
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|
308 |
|
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// build the properites here from the filelist.... |
309 |
|
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StringTokenizer st = new StringTokenizer(fileList, ";"); |
310 |
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|
311 |
|
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// some holders for variables |
312 |
|
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File currentFile; |
313 |
|
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long lastModified, newLastModified; |
314 |
|
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Properties properties, prevProperties; |
315 |
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|
316 |
|
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// the root of all configurations will be the system config |
317 |
|
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// so we need to open the properties of that |
318 |
|
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Properties defaultProperties = new Properties(); |
319 |
|
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currentFile = new File(_configPath, _systemConfigFile); |
320 |
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lastModified = currentFile.lastModified(); |
321 |
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defaultProperties.load(new FileInputStream(currentFile)); |
322 |
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|
323 |
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// This loop then iterates over the file list |
324 |
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// creates the properties to be passed to the |
325 |
|
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// Configuration constructor |
326 |
|
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do { |
327 |
|
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properties = new Properties(defaultProperties); |
328 |
|
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currentFile = new File(_configPath, st.nextToken()); |
329 |
|
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newLastModified = currentFile.lastModified(); |
330 |
|
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if (newLastModified > lastModified) { |
331 |
|
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lastModified = newLastModified; |
332 |
|
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} |
333 |
|
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properties.load(new FileInputStream(currentFile)); |
334 |
|
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defaultProperties = properties; |
335 |
|
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} while (st.hasMoreTokens()); |
336 |
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|
337 |
|
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// this creates the configuration, all nice, ready to be returned |
338 |
|
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ConfigurationServant ref = new ConfigurationServant(properties, fileList, lastModified); |
339 |
|
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org.omg.CORBA.Object objRef = _refman.getRootPOA().servant_to_reference(ref); |
340 |
|
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config = ConfigurationHelper.narrow(objRef); |
341 |
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|
342 |
|
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} catch (Exception e) { |
343 |
|
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// not sure what to do here |
344 |
|
|
// so we just log the error |
345 |
ajm |
1.10 |
_logger.write(toString(), Logger.ERROR, "ERROR - " + e); |
346 |
ajm |
1.8 |
} |
347 |
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|
348 |
|
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// if there isn't an entry for the requested config |
349 |
|
|
} else { |
350 |
|
|
_logger.write(toString(), Logger.DEBUG, "no configured config, returning " + _systemConfigFile); |
351 |
|
|
config = _systemConfig; |
352 |
|
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} |
353 |
|
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return config; |
354 |
|
|
} |
355 |
|
|
|
356 |
ajm |
1.3 |
//---ACCESSOR/MUTATOR METHODS--- |
357 |
|
|
|
358 |
|
|
//---ATTRIBUTES--- |
359 |
|
|
|
360 |
|
|
/** |
361 |
ajm |
1.6 |
* This is the friendly identifier of the |
362 |
|
|
* component this class is running in. |
363 |
|
|
* eg, a Filter may be called "filter1", |
364 |
|
|
* If this class does not have an owning |
365 |
|
|
* component, a name from the configuration |
366 |
|
|
* can be placed here. This name could also |
367 |
|
|
* be changed to null for utility classes. |
368 |
|
|
*/ |
369 |
|
|
private String _name = Core.NAME; |
370 |
|
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|
371 |
|
|
/** |
372 |
|
|
* This holds a reference to the |
373 |
|
|
* system logger that is being used. |
374 |
ajm |
1.3 |
*/ |
375 |
ajm |
1.6 |
private Logger _logger = ReferenceManager.getInstance().getLogger(); |
376 |
ajm |
1.3 |
|
377 |
|
|
/** |
378 |
ajm |
1.6 |
* A reference to the reference manager in use |
379 |
ajm |
1.3 |
*/ |
380 |
ajm |
1.6 |
private ReferenceManager _refman = ReferenceManager.getInstance(); |
381 |
ajm |
1.3 |
|
382 |
|
|
/** |
383 |
|
|
* The root path to all configurations |
384 |
|
|
*/ |
385 |
|
|
private String _configPath; |
386 |
|
|
|
387 |
|
|
/** |
388 |
|
|
* The name of the file that contains the system configuration |
389 |
|
|
*/ |
390 |
|
|
private String _systemConfigFile; |
391 |
|
|
|
392 |
|
|
/** |
393 |
|
|
* An instance of the system config |
394 |
|
|
*/ |
395 |
|
|
private Configuration _systemConfig; |
396 |
ajm |
1.8 |
|
397 |
|
|
/** |
398 |
|
|
* The system config file represented by a |
399 |
|
|
* properties object. |
400 |
|
|
*/ |
401 |
|
|
private Properties _systemConfigHolder; |
402 |
ajm |
1.3 |
|
403 |
|
|
//---STATIC ATTRIBUTES--- |
404 |
|
|
|
405 |
|
|
} |