BpelDAOConnectionFactoryImpl.java

/*
 * JBoss, Home of Professional Open Source
 * Copyright 2014, Red Hat Middleware LLC, and others contributors as indicated
 * by the @authors tag. All rights reserved.
 * See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
 * of the GNU Lesser General Public License, v. 2.1.
 * This program is distributed in the hope that it will be useful, but WITHOUT A
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
 * PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more details.
 * You should have received a copy of the GNU Lesser General Public License,
 * v.2.1 along with this distribution; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA  02110-1301, USA.
 */
package org.riftsaw.engine.osgi;

import java.util.Dictionary;
import java.util.Hashtable;
import java.util.Map;
import java.util.Properties;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.spi.PersistenceProvider;
import javax.sql.DataSource;
import javax.transaction.TransactionManager;

import org.apache.ode.dao.bpel.BpelDAOConnection;
import org.apache.ode.dao.bpel.BpelDAOConnectionFactory;
import org.apache.ode.dao.jpa.JpaOperator;
import org.apache.ode.dao.jpa.bpel.BpelDAOConnectionImpl;
import org.apache.ode.dao.jpa.hibernate.HibernateUtil;
import org.apache.ode.dao.jpa.hibernate.JpaOperatorImpl;
import org.apache.ode.il.config.OdeConfigProperties;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleContext;
import org.osgi.framework.FrameworkUtil;
import org.osgi.framework.ServiceReference;
import org.osgi.framework.ServiceRegistration;

/**
 * BpelDAOConnectionFactory which delegates to OSGi PersistenceProvider to
 * acquire EntityManagerFactory.
 */
public class BpelDAOConnectionFactoryImpl implements BpelDAOConnectionFactory {

    private JpaOperator _operator = new JpaOperatorImpl();
    private EntityManagerFactory _emf;
    private TransactionManager _txm;
    private DataSource _ds;
    private ServiceRegistration _reg;

    @Override
    public void init(Properties odeConfig, TransactionManager txm, Object env) {
        _txm = txm;
        _ds = (DataSource) env;

        Bundle thisBundle = FrameworkUtil.getBundle(getClass());
        BundleContext context = thisBundle.getBundleContext();
        ServiceReference serviceReference = context.getServiceReference(PersistenceProvider.class.getName());
        PersistenceProvider persistenceProvider = (PersistenceProvider) context.getService(serviceReference);

        Map<?, ?> emfProperties = HibernateUtil.buildConfig(OdeConfigProperties.PROP_DAOCF + ".", odeConfig, _txm, _ds);
        _emf = persistenceProvider.createEntityManagerFactory("ode-bpel", emfProperties);

        // dirty hack
        odeConfig.put("ode.emf", _emf);
        
        // even hackier
        Dictionary<String, Object> serviceProperties = new Hashtable<String,Object>();
        serviceProperties.put("ode.emf", true);
        _reg = context.registerService(EntityManagerFactory.class.getName(), _emf, serviceProperties);
    }

    @Override
    public BpelDAOConnection getConnection() {
        final ThreadLocal<BpelDAOConnectionImpl> currentConnection = BpelDAOConnectionImpl.getThreadLocal();

        BpelDAOConnectionImpl conn = (BpelDAOConnectionImpl) currentConnection.get();
        if (conn != null && HibernateUtil.isOpen(conn)) {
            return conn;
        } else {
            EntityManager em = _emf.createEntityManager();
            conn = new BpelDAOConnectionImpl(em, _txm, _operator);
            currentConnection.set(conn);
            return conn;
        }
    }

    @Override
    public void shutdown() {
        try {
            _reg.unregister();
        } catch (Exception e) {
            e.fillInStackTrace();
        }
        _emf.close();
    }

}