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Cayenne Object Persistence Framework
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* Licensed to the Apache Software Foundation (ASF) under one
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* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
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*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
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package org.apache.cayenne.conf;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.sql.DataSource;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import org.apache.cayenne.access.QueryLogger;
import org.apache.cayenne.util.Util;
/**
* Looks up DataSource objects via JNDI.
*
* @author Andrei Adamchik
*/
public class JNDIDataSourceFactory implements DataSourceFactory {
private static final Logger logObj = Logger.getLogger(JNDIDataSourceFactory.class);
protected Configuration parentConfig;
public void initializeWithParentConfiguration(Configuration conf) {
this.parentConfig = conf;
}
/**
* Returns DataSource object corresponding to location
. Location is
* expected to be a path mapped in JNDI InitialContext.
*
* @deprecated since 1.2
*/
public DataSource getDataSource(String location, Level logLevel) throws Exception {
return getDataSource(location);
}
/**
* Attempts to load DataSource using JNDI. In case of failure tries to get the
* DataSource with the same name from CayenneModeler preferences.
*/
public DataSource getDataSource(String location) throws Exception {
try {
return loadViaJNDI(location);
}
catch (Exception ex) {
logObj.info("failed JNDI lookup, attempt to load "
+ "from local preferences. Location key:"
+ location);
// failover to preferences loader to allow local development
try {
return loadFromPreferences(location);
}
catch (Exception preferencesException) {
logObj.info("failed loading from local preferences", Util
.unwindException(preferencesException));
// giving up ... rethrow original exception...
QueryLogger.logConnectFailure(ex);
throw ex;
}
}
}
DataSource loadViaJNDI(String location) throws NamingException {
QueryLogger.logConnect(location);
Context initCtx = new InitialContext();
DataSource ds;
try {
Context envCtx = (Context) initCtx.lookup("java:comp/env");
ds = (DataSource) envCtx.lookup(location);
}
catch (NamingException namingEx) {
// try looking up the location directly...
ds = (DataSource) initCtx.lookup(location);
}
QueryLogger.logConnectSuccess();
return ds;
}
DataSource loadFromPreferences(String location) throws Exception {
// as we don't want compile dependencies on the Modeler, instantiate factory via
// reflection ...
DataSourceFactory prefsFactory = (DataSourceFactory) Class
.forName(
"org.apache.cayenne.modeler.pref.PreferencesDataSourceFactory")
.newInstance();
prefsFactory.initializeWithParentConfiguration(parentConfig);
return prefsFactory.getDataSource(location);
}
}
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