gistfile1.java

/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2011, Red Hat, Inc., and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY 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 along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.jboss.as.jpa.container;

import static org.jboss.as.jpa.JpaMessages.MESSAGES;

import java.io.IOException;
import java.io.Serializable;
import java.util.Map;

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

import org.jboss.as.jpa.service.PersistenceUnitServiceImpl;
import org.jboss.as.jpa.transaction.TransactionUtil;
import org.jboss.as.jpa.util.JPAServiceNames;
import org.jboss.as.server.CurrentServiceContainer;
import org.jboss.msc.service.ServiceController;

/**
 * Transaction scoped entity manager will be injected into SLSB or SFSB beans.  At bean invocation time, they
 * will join the active transaction if one is present.  Otherwise, they will simply be cleared at the end of
 * the bean invocation.
 * <p/>
 * This is a proxy for the underlying persistent provider EntityManager.
 *
 * @author Scott Marlow
 */
public class TransactionScopedEntityManager extends AbstractEntityManager implements Serializable {

    private static final long serialVersionUID = 455498111L;

    private final String puScopedName;          // Scoped name of the persistent unit
    private final Map properties;
    private transient EntityManagerFactory emf;

    public TransactionScopedEntityManager(String puScopedName, Map properties, EntityManagerFactory emf) {
        this.puScopedName = puScopedName;
        this.properties = properties;
        this.emf = emf;
    }

    @Override
    protected EntityManager getEntityManager() {
        EntityManager result;
        boolean isInTx;

        isInTx = TransactionUtil.isInTx();

        if (isInTx) {
            result = TransactionUtil.getOrCreateTransactionScopedEntityManager(emf, puScopedName, properties);
        } else {
            result = NonTxEmCloser.get(puScopedName);
            if (result == null) {
                result = EntityManagerUtil.createEntityManager(emf, properties);
                NonTxEmCloser.add(puScopedName, result);
            }
        }
        return result;
    }

    @Override
    protected boolean isExtendedPersistenceContext() {
        return false;
    }

    @Override
    protected boolean isInTx() {
        return TransactionUtil.isInTx();
    }

    /**
     * Catch the application trying to close the container managed entity manager and throw an IllegalStateException
     */
    @Override
    public void close() {
        // Transaction scoped entity manager will be closed when the (owning) component invocation completes
        throw MESSAGES.cannotCloseTransactionContainerEntityManger();
    }

    private void readObject(java.io.ObjectInputStream in) throws IOException, ClassNotFoundException {
        // read all non-transient fields
        in.defaultReadObject();
        final ServiceController<?> controller = CurrentServiceContainer.getServiceContainer().getService(JPAServiceNames.getPUServiceName(puScopedName));
        final PersistenceUnitServiceImpl persistenceUnitService = (PersistenceUnitServiceImpl) controller.getService();
        emf = persistenceUnitService.getEntityManagerFactory();
    }
}