Examples with IndirectCollection org.eclipse.persistence.indirection.IndirectCollection used on opensource projects

Example 6 with IndirectCollection

use of org.eclipse.persistence.indirection.IndirectCollection in project eclipselink by eclipse-ee4j.

the class AdvancedJPAJunitTest method testTransparentIndirectionValueHolderSessionReset.

/**
 * Bug 470161 - ServerSession links RepeatableWriteUnitOfWork via entity / IndirectList / QueryBasedValueHolder\
 *
 * Through the UoW: Persist a new object, read an existing object in (building from rows, original not put in the
 * shared cache), associate existing object with new object, commit. Previously, after the changes are merged
 * into the shared cache, the transparent collection on the existing object has a wrapped VH from the initial uow
 * query, which internally references the uow session, not the shared session.
 */
public void testTransparentIndirectionValueHolderSessionReset() {
    Employee emp = null;
    Dealer dealer = null;
    // setup
    EntityManager em = createEntityManager();
    try {
        beginTransaction(em);
        dealer = new Dealer();
        dealer.setFirstName("Angle");
        dealer.setLastName("Bracket");
        em.persist(dealer);
        commitTransaction(em);
    } finally {
        closeEntityManager(em);
        // start test with an empty cache
        clearCache();
    }
    // test
    em = createEntityManager();
    try {
        beginTransaction(em);
        emp = new Employee();
        emp.setFemale();
        emp.setFirstName("Case");
        emp.setLastName("Statement");
        em.persist(emp);
        Query query = em.createQuery("select d from Dealer d where d.firstName = :firstName and d.lastName = :lastName");
        query.setParameter("firstName", dealer.getFirstName());
        query.setParameter("lastName", dealer.getLastName());
        List<Dealer> resultsList = query.getResultList();
        assertTrue("List returned should be non-empty", resultsList.size() > 0);
        Dealer dealerFound = resultsList.get(0);
        emp.addDealer(dealerFound);
        commitTransaction(em);
        // verify valueholder configuration in shared cache
        Session parentSession = JpaHelper.getServerSession(em.getEntityManagerFactory());
        Dealer cachedDealer = (Dealer) parentSession.getIdentityMapAccessor().getFromIdentityMap(dealer);
        assertNotNull("Dealer with id should be in the cache: " + dealer.getId(), cachedDealer);
        ClassDescriptor descriptor = parentSession.getDescriptor(Dealer.class);
        DatabaseMapping mapping = descriptor.getMappingForAttributeName("customers");
        IndirectCollection indirectCollection = (IndirectCollection) mapping.getAttributeValueFromObject(cachedDealer);
        assertFalse("Collection VH should be uninstantiated", indirectCollection.isInstantiated());
        DatabaseValueHolder dbValueHolder = (DatabaseValueHolder) indirectCollection.getValueHolder();
        assertFalse("Referenced VH should be uninstantiated", dbValueHolder.isInstantiated());
        Session vhSession = dbValueHolder.getSession();
        assertSame("Dealer.customers VH session should reference the shared session", parentSession, vhSession);
    } finally {
        closeEntityManager(em);
    }
    // reset
    em = createEntityManager();
    try {
        beginTransaction(em);
        emp = em.find(Employee.class, emp.getId());
        if (emp != null) {
            em.remove(emp);
        }
        dealer = em.find(Dealer.class, dealer.getId());
        if (dealer != null) {
            em.remove(dealer);
        }
        commitTransaction(em);
    } finally {
        closeEntityManager(em);
    }
}