/*
* Copyright 2003,2004 Colin Crist
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package hermes.ext;
import hermes.HermesAdminFactory;
import hermes.HermesException;
import hermes.config.ProviderExtConfig;
import hermes.impl.ClassLoaderManager;
import hermes.impl.LoaderSupport;
import javax.jms.ConnectionFactory;
import javax.jms.JMSException;
import javax.naming.NamingException;
import org.apache.log4j.Logger;
/**
* I've avoided any reference to the actualy interfaces that are provider
* specific so this class will compile even if they provider libraries are not
* present. Makes the code look scrappy and its clearly un-typesafe but there u
* go.
*
* @author colincrist@hermesjms.com
* @version $Id: ExtensionFinderImpl.java,v 1.6 2004/07/30 17:25:15 colincrist
* Exp $
*/
public class ExtensionFinderImpl implements ExtensionFinder {
private static final Logger log = Logger.getLogger(ExtensionFinderImpl.class);
private ClassLoaderManager classLoaderManager;
public ExtensionFinderImpl(ClassLoaderManager classLoaderManager) {
this.classLoaderManager = classLoaderManager;
}
public synchronized HermesAdminFactory createExtension(String classPathId, ProviderExtConfig extConfig, ConnectionFactory cf)
throws InstantiationException, ClassNotFoundException, NamingException, JMSException {
if (extConfig != null && extConfig.getClassName() != null && !extConfig.getClassName().equals("")) {
log.debug("creating extension " + extConfig.getClassName() + " for " + cf.getClass().getName());
HermesAdminFactory providerExtension = null;
try {
ClassLoader classLoader = classLoaderManager.getClassLoader(classPathId);
log.debug("loading from " + classLoader);
Thread.currentThread().setContextClassLoader(classLoader);
providerExtension = (HermesAdminFactory) classLoader.loadClass(extConfig.getClassName()).newInstance();
LoaderSupport.populateBean(providerExtension, extConfig.getProperties());
} catch (Exception e) {
log.debug(e.getMessage(), e);
throw new HermesException(e);
}
return providerExtension;
}
return new DefaultHermesAdminFactory();
}
}