Examples with User org.jpwh.model.fetching.proxy.User used on opensource projects

Example 1 with User

use of org.jpwh.model.fetching.proxy.User in project microservices by pwillhan.

the class LazyProxyCollections method storeTestData.

public FetchTestData storeTestData() throws Exception {
    UserTransaction tx = TM.getUserTransaction();
    tx.begin();
    EntityManager em = JPA.createEntityManager();
    Long[] categoryIds = new Long[3];
    Long[] itemIds = new Long[3];
    Long[] userIds = new Long[3];
    User johndoe = new User("johndoe");
    em.persist(johndoe);
    userIds[0] = johndoe.getId();
    User janeroe = new User("janeroe");
    em.persist(janeroe);
    userIds[1] = janeroe.getId();
    User robertdoe = new User("robertdoe");
    em.persist(robertdoe);
    userIds[2] = robertdoe.getId();
    Category category = new Category("Category One");
    em.persist(category);
    categoryIds[0] = category.getId();
    Item item = new Item("Item One", CalendarUtil.TOMORROW.getTime(), johndoe);
    em.persist(item);
    itemIds[0] = item.getId();
    category.getItems().add(item);
    item.getCategories().add(category);
    for (int i = 1; i <= 3; i++) {
        Bid bid = new Bid(item, robertdoe, new BigDecimal(9 + i));
        item.getBids().add(bid);
        em.persist(bid);
    }
    category = new Category("Category Two");
    em.persist(category);
    categoryIds[1] = category.getId();
    item = new Item("Item Two", CalendarUtil.TOMORROW.getTime(), johndoe);
    em.persist(item);
    itemIds[1] = item.getId();
    category.getItems().add(item);
    item.getCategories().add(category);
    for (int i = 1; i <= 1; i++) {
        Bid bid = new Bid(item, janeroe, new BigDecimal(2 + i));
        item.getBids().add(bid);
        em.persist(bid);
    }
    item = new Item("Item Three", CalendarUtil.AFTER_TOMORROW.getTime(), janeroe);
    em.persist(item);
    itemIds[2] = item.getId();
    category.getItems().add(item);
    item.getCategories().add(category);
    category = new Category("Category Three");
    em.persist(category);
    categoryIds[2] = category.getId();
    tx.commit();
    em.close();
    FetchTestData testData = new FetchTestData();
    testData.items = new TestData(itemIds);
    testData.users = new TestData(userIds);
    return testData;
}

Example 2 with User

use of org.jpwh.model.fetching.proxy.User in project microservices by pwillhan.

the class LazyProxyCollections method lazyEntityProxies.

@Test
public void lazyEntityProxies() throws Exception {
    FetchTestData testData = storeTestData();
    UserTransaction tx = TM.getUserTransaction();
    try {
        tx.begin();
        EntityManager em = JPA.createEntityManager();
        Long ITEM_ID = testData.items.getFirstId();
        Long USER_ID = testData.users.getFirstId();
        {
            // No SELECT
            Item item = em.getReference(Item.class, ITEM_ID);
            // Calling identifier getter (no field access!) doesn't trigger initialization
            assertEquals(item.getId(), ITEM_ID);
            // The class is runtime generated, named something like: Item_$$_javassist_1
            assertNotEquals(item.getClass(), Item.class);
            assertEquals(HibernateProxyHelper.getClassWithoutInitializingProxy(item), Item.class);
            PersistenceUtil persistenceUtil = Persistence.getPersistenceUtil();
            assertFalse(persistenceUtil.isLoaded(item));
            assertFalse(persistenceUtil.isLoaded(item, "seller"));
            assertFalse(Hibernate.isInitialized(item));
            // Would trigger initialization of item!
            // assertFalse(Hibernate.isInitialized(item.getSeller()));
            Hibernate.initialize(item);
            // select * from ITEM where ID = ?
            // Let's make sure the default EAGER of @ManyToOne has been overriden with LAZY
            assertFalse(Hibernate.isInitialized(item.getSeller()));
            Hibernate.initialize(item.getSeller());
        // select * from USERS where ID = ?
        }
        em.clear();
        {
            /* 
                   An <code>Item</code> entity instance is loaded in the persistence context, its
                   <code>seller</code> is not initialized, it's a <code>User</code> proxy.
                 */
            Item item = em.find(Item.class, ITEM_ID);
            // select * from ITEM where ID = ?
            /* 
                   You can manually detach the data from the persistence context, or close the
                   persistence context and detach everything.
                 */
            em.detach(item);
            em.detach(item.getSeller());
            // em.close();
            /* 
                   The static <code>PersistenceUtil</code> helper works without a persistence
                   context, you can check at any time if the data you want to access has
                   actually been loaded.
                 */
            PersistenceUtil persistenceUtil = Persistence.getPersistenceUtil();
            assertTrue(persistenceUtil.isLoaded(item));
            assertFalse(persistenceUtil.isLoaded(item, "seller"));
            /* 
                   In detached state, you can call the identifier getter method of the
                   <code>User</code> proxy. However, calling any other method on the proxy,
                   such as <code>getUsername()</code>, will throw a <code>LazyInitializationException</code>.
                   Data can only be loaded on-demand while the persistence context manages the proxy, not in detached
                   state.
                 */
            assertEquals(item.getSeller().getId(), USER_ID);
        // Throws exception!
        // assertNotNull(item.getSeller().getUsername());
        }
        em.clear();
        {
            // There is no SQL SELECT in this procedure, only one INSERT!
            Item item = em.getReference(Item.class, ITEM_ID);
            User user = em.getReference(User.class, USER_ID);
            Bid newBid = new Bid(new BigDecimal("99.00"));
            newBid.setItem(item);
            newBid.setBidder(user);
            em.persist(newBid);
            // insert into BID values (?, ? ,? , ...)
            em.flush();
            em.clear();
            assertEquals(em.find(Bid.class, newBid.getId()).getAmount().compareTo(new BigDecimal("99")), 0);
        }
        tx.commit();
        em.close();
    } finally {
        TM.rollback();
    }
}