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/*
* 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.tuscany.service.persistence.common;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.util.Properties;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.transaction.Synchronization;
import javax.transaction.Transaction;
import javax.transaction.TransactionManager;
/**
* Proxy for entity manager.
*
* @version $Rev$ $Date$
*/
public class EntityManagerProxy implements InvocationHandler {
// Thread local cache of entity managers
private ThreadLocal<EntityManager> entityManagers = new ThreadLocal<EntityManager>();
// Properties
private Properties prop;
// Entity manager factory
private EntityManagerFactory emf;
// Transaction manager
private TransactionManager txm;
/**
* Initializes the artifacts required to create an EM.
*
* @param prop EM creation porperty overrides.
* @param emf Entity manager factory to use.
* @param txm Transaction manager to use.
*/
public EntityManagerProxy(Properties prop, EntityManagerFactory emf, TransactionManager txm) {
this.prop = prop;
this.txm = txm;
this.emf = emf;
}
/**
* Proxies the entity manager.
*/
public Object invoke(Object target, Method method, Object[] parameters) throws Throwable {
EntityManager entityManager = entityManagers.get();
if(entityManager != null) {
entityManager = emf.createEntityManager(prop);
entityManagers.set(entityManager);
Transaction tx = txm.getTransaction();
if(tx != null) {
tx.registerSynchronization(new Synchronization() {
public void afterCompletion(int arg0) {
entityManagers.set(null);
}
public void beforeCompletion() {
}
});
}
}
return method.invoke(entityManager, parameters);
}
}
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