org.fryske_akademy.jpa.JpaUtil Maven / Gradle / Ivy
package org.fryske_akademy.jpa;
/*-
* #%L
* ejbCrudApi
* %%
* Copyright (C) 2018 Fryske Akademy
* %%
* 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.
* #L%
*/
import java.security.Principal;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.logging.Logger;
import javax.ejb.SessionContext;
import javax.faces.context.FacesContext;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
public class JpaUtil {
private static final Logger LOGGER = Logger.getLogger(JpaUtil.class.getName());
private static final Map emFacts
= new ConcurrentHashMap(5) {
@Override
public EntityManagerFactory get(Object key) {
if (!containsKey(key) || !super.get(key).isOpen()) {
put(String.valueOf(key), Persistence.createEntityManagerFactory(String.valueOf(key)));
}
return super.get(key);
}
};
/**
* return a cached EntityManagerFactory, make sure you close it when it is not needed anymore.
* @param name
* @return
*/
public static EntityManagerFactory getEntityManagerFactory(String name) {
return emFacts.get(name);
}
/**
* Looks for principal in facescontext or ejb sessioncontext
*
* @return
* @throws javax.naming.NamingException
* @throws IllegalStateException
*/
public static Principal findPrincipal() throws NamingException, IllegalStateException {
Principal p = null;
try {
p = FacesContext.getCurrentInstance().getExternalContext().getUserPrincipal();
} catch (IllegalStateException e) {
LOGGER.warning("failure finding principal in facescontext, trying ejbcontext");
}
if (p == null) {
InitialContext ic = new InitialContext();
SessionContext context = (SessionContext) ic.lookup("java:comp/EJBContext");
p = context.getCallerPrincipal();
}
return p;
}
}