org.reusables.jpa.HibernateEntityManagerFactoryBean.java Source code

Introduction

Here is the source code for org.reusables.jpa.HibernateEntityManagerFactoryBean.java

Source

/*
 * Copyright 2010-2012 the original author or authors.
 *
 * 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 org.reusables.jpa;

import static org.springframework.orm.jpa.EntityManagerFactoryUtils.getTransactionalEntityManager;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;

import org.hibernate.ejb.HibernateEntityManager;
import org.springframework.beans.factory.FactoryBean;
import org.springframework.beans.factory.annotation.Required;
import org.springframework.orm.jpa.EntityManagerFactoryUtils;

/**
 * {@link FactoryBean} for accessing the {@link EntityManager} of the current transaction.
 * 
 * <p>Factory that creates a proxy for the {@link HibernateEntityManager} interface.
 * The proxy reroutes calls to the {@link EntityManager} returned by {@link EntityManagerFactoryUtils#getTransactionalEntityManager(EntityManagerFactory)}.
 * </p>
 * 
 * @author marcel
 */
public class HibernateEntityManagerFactoryBean implements FactoryBean<HibernateEntityManager>, InvocationHandler {
    private EntityManagerFactory entityManagerFactory;

    @Required
    public void setEntityManagerFactory(final EntityManagerFactory entityManagerFactory) {
        this.entityManagerFactory = entityManagerFactory;
    }

    @Override
    public Class<?> getObjectType() {
        return HibernateEntityManager.class;
    }

    @Override
    public boolean isSingleton() {
        return true;
    }

    @Override
    public HibernateEntityManager getObject() throws Exception {
        return (HibernateEntityManager) Proxy.newProxyInstance(getClass().getClassLoader(),
                new Class<?>[] { HibernateEntityManager.class }, this);
    }

    @Override
    public Object invoke(final Object proxy, final Method method, final Object[] args) throws Throwable {
        return method.invoke(getTransactionalEntityManager(this.entityManagerFactory), args);
    }
}