/*
 * 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.openjpa.persistence.simple;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

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

import org.apache.openjpa.persistence.test.SingleEMFTestCase;

import junit.textui.TestRunner;

/**
 * Tests that a EntityManagerFactory can be used after serialization.
 *
 * @author David Ezzio
 */
public class TestSerializedFactory extends SingleEMFTestCase {

    @Override
    public void setUp() {
        setUp(AllFieldTypes.class, CLEAR_TABLES);
    }

    /**
     * This test case assumes that OpenJPA creates EMF objects that are
     * instances of the Serializable interface. If this changes, the test logic
     * has to change.
     * <p>
     * Currently, although the EMF objects implement Serializable, they do not
     * successfully pass through serialization. Once they do (assuming they
     * should), the catch block in the test and the fail method invocation can
     * be removed.
     */
    public void testSerializedEntityManagerFactory() throws Exception {
        // correct the logic if and when EMFs do not implement
        // the serializable interface
        assertTrue("EntityManagerFactory object is not serializable",
                emf instanceof Serializable);

        // serialize and deserialize the entity manager factory
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        ObjectOutputStream oos = new ObjectOutputStream(baos);
        oos.writeObject(emf);
        EntityManagerFactory emf2 =
                (EntityManagerFactory) new ObjectInputStream(
                new ByteArrayInputStream(baos.toByteArray())).readObject();

        // use the deserialized entity manager factory
        assertTrue("The deserialized entity manager factory is not open",
                emf2.isOpen());
        EntityManager em = emf2.createEntityManager();
        assertTrue("The newly created entity manager is not open",
                em.isOpen());

        // exercise the entity manager produced from the deserialized EMF
        em.getTransaction().begin();
        em.persist(new AllFieldTypes());
        em.getTransaction().commit();

        // close the extra resources
        em.close();
        assertFalse("The entity manager is not closed", em.isOpen());

        // clean up any committed records, etc.
        clear(emf2);
        if (emf2.isOpen())
            emf2.close();
        assertFalse("The entity manager factory is not closed",
                emf2.isOpen());
        emf2 = null;
        oos.close();
    }

    public static void main(String[] args) {
        TestRunner.run(TestSerializedFactory.class);
    }
}
