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Java > Open Source Codes > org > objectstyle > cayenne > conf > JNDIDataSourceFactory


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56
57 package org.objectstyle.cayenne.conf;
58
59 import javax.naming.Context JavaDoc;
60 import javax.naming.InitialContext JavaDoc;
61 import javax.naming.NamingException JavaDoc;
62 import javax.sql.DataSource JavaDoc;
63
64 import org.apache.log4j.Level;
65 import org.apache.log4j.Logger;
66 import org.objectstyle.cayenne.access.QueryLogger;
67 import org.objectstyle.cayenne.util.Util;
68
69 /**
70  * Looks up DataSource objects via JNDI.
71  *
72  * @author Andrei Adamchik
73  */
74 public class JNDIDataSourceFactory implements DataSourceFactory {
75
76     private static final Logger logObj = Logger.getLogger(JNDIDataSourceFactory.class);
77
78     protected Configuration parentConfig;
79
80     /**
81      * Returns DataSource object corresponding to <code>location</code>. Location is
82      * expected to be a path mapped in JNDI InitialContext.
83      */
84     public DataSource JavaDoc getDataSource(String JavaDoc location) throws Exception JavaDoc {
85         return getDataSource(location, Level.DEBUG);
86     }
87
88     public void initializeWithParentConfiguration(Configuration conf) {
89         this.parentConfig = conf;
90     }
91
92     /**
93      * Attempts to load DataSource using JNDI. In case of failure tries to get the
94      * DataSource with the same name from CayenneModeler preferences.
95      */
96     public DataSource JavaDoc getDataSource(String JavaDoc location, Level logLevel) throws Exception JavaDoc {
97         if (logLevel == null) {
98             logLevel = Level.DEBUG;
99         }
100
101         try {
102             return loadViaJNDI(location, logLevel);
103         }
104         catch (Exception JavaDoc ex) {
105
106             logObj
107                     .debug("failed JNDI lookup, attempt to load from local preferences. Location key:"
108                             + location);
109
110             // failover to preferences loader to allow local development
111 try {
112                 return loadFromPreferences(location, logLevel);
113             }
114             catch (Exception JavaDoc preferencesException) {
115
116                 logObj.debug("failed loading from local preferences", Util
117                         .unwindException(preferencesException));
118
119                 // giving up ... rethrow original exception...
120 QueryLogger.logConnectFailure(logLevel, ex);
121                 throw ex;
122             }
123         }
124     }
125
126     DataSource JavaDoc loadViaJNDI(String JavaDoc location, Level logLevel) throws NamingException JavaDoc {
127         QueryLogger.logConnect(logLevel, location);
128
129         Context JavaDoc initCtx = new InitialContext JavaDoc();
130         DataSource JavaDoc ds;
131         try {
132             Context JavaDoc envCtx = (Context JavaDoc) initCtx.lookup("java:comp/env");
133             ds = (DataSource JavaDoc) envCtx.lookup(location);
134         }
135         catch (NamingException JavaDoc namingEx) {
136             // try looking up the location directly...
137 ds = (DataSource JavaDoc) initCtx.lookup(location);
138         }
139
140         QueryLogger.logConnectSuccess(logLevel);
141         return ds;
142     }
143
144     DataSource JavaDoc loadFromPreferences(String JavaDoc location, Level logLevel) throws Exception JavaDoc {
145         // as we don't want compile dependencies on the Modeler, instantiate factory via
146 // reflection ...
147
148         DataSourceFactory prefsFactory = (DataSourceFactory) Class
149                 .forName(
150                         "org.objectstyle.cayenne.modeler.pref.PreferencesDataSourceFactory")
151                 .newInstance();
152
153         prefsFactory.initializeWithParentConfiguration(parentConfig);
154         return prefsFactory.getDataSource(location, logLevel);
155     }
156 }
157
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