/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file 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 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 org.apache.wicket.cdi;
import javax.enterprise.inject.spi.BeanManager;
import javax.enterprise.inject.spi.CDI;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import org.apache.wicket.Application;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Defines several strategies for looking up a CDI BeanManager in a portable
* way. The following strategies are tried (in order):
* <ul>
* <li>JNDI under java:comp/BeanManager (default location)</li>
* <li>JNDI under java:comp/env/BeanManager (for servlet containers like Tomcat
* and Jetty)</li>
* <li>CDI.current().getBeanManager() (portable lookup)</li>
* <li>{@linkplain CdiConfiguration#getFallbackBeanManager() Fallback}</li>
* </ul>
*
* The last successful lookup strategy is saved and tried first next time.
*
* @author papegaaij
*/
public final class BeanManagerLookup
{
private static final Logger log = LoggerFactory.getLogger(BeanManagerLookup.class);
private enum BeanManagerLookupStrategy {
JNDI {
@Override
public BeanManager lookup()
{
try
{
return InitialContext.doLookup("java:comp/BeanManager");
}
catch (NamingException e)
{
return null;
}
}
},
JNDI_ENV {
@Override
public BeanManager lookup()
{
try
{
return InitialContext.doLookup("java:comp/env/BeanManager");
}
catch (NamingException e)
{
return null;
}
}
},
CDI_PROVIDER {
@Override
public BeanManager lookup()
{
try
{
return CDI.current().getBeanManager();
}
catch (Exception e)
{
log.debug(e.getMessage(), e);
return null;
}
}
},
FALLBACK {
@Override
public BeanManager lookup()
{
return CdiConfiguration.get(Application.get()).getFallbackBeanManager();
}
};
public abstract BeanManager lookup();
}
private static BeanManagerLookupStrategy lastSuccessful = BeanManagerLookupStrategy.JNDI;
private BeanManagerLookup()
{
}
public static BeanManager lookup()
{
BeanManager ret = lastSuccessful.lookup();
if (ret != null)
return ret;
for (BeanManagerLookupStrategy curStrategy : BeanManagerLookupStrategy.values())
{
ret = curStrategy.lookup();
if (ret != null)
{
lastSuccessful = curStrategy;
return ret;
}
}
throw new IllegalStateException(
"No BeanManager found via the CDI provider and no fallback specified. Check your "
+ "CDI setup or specify a fallback BeanManager in the CdiConfiguration.");
}
}