Examples with Item org.jpwh.model.fetching.profile.Item used on opensource projects

Example 1 with Item

use of org.jpwh.model.fetching.profile.Item in project microservices by pwillhan.

the class Profile method storeTestData.

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

Example 2 with Item

use of org.jpwh.model.fetching.profile.Item in project microservices by pwillhan.

the class Profile method fetchWithProfile.

@Test
public void fetchWithProfile() throws Exception {
    FetchTestData testData = storeTestData();
    UserTransaction tx = TM.getUserTransaction();
    try {
        tx.begin();
        EntityManager em = JPA.createEntityManager();
        Long ITEM_ID = testData.items.getFirstId();
        /* 
                The <code>Item#seller</code> is mapped lazy, so the default fetch plan
                will only retrieve the <code>Item</code> instance.
             */
        Item item = em.find(Item.class, ITEM_ID);
        assertFalse(Hibernate.isInitialized(item.getSeller()));
        em.clear();
        /* 
                You need the Hibernate API to enable a profile, it is then active for any operation in that
                unit of work. Now the <code>Item#seller</code> will be fetched with a join in the same SQL
                statement whenever an <code>Item</code> is loaded with this <code>EntityManager</code>.
             */
        em.unwrap(Session.class).enableFetchProfile(Item.PROFILE_JOIN_SELLER);
        item = em.find(Item.class, ITEM_ID);
        em.clear();
        assertNotNull(item.getSeller().getUsername());
        em.clear();
        /* 
                You can overlay another profile on the same unit of work, now the <code>Item#seller</code>
                and the <code>Item#bids</code> collection will be fetched with a join in the same SQL
                statement whenever an <code>Item</code> is loaded.
             */
        em.unwrap(Session.class).enableFetchProfile(Item.PROFILE_JOIN_BIDS);
        item = em.find(Item.class, ITEM_ID);
        em.clear();
        assertNotNull(item.getSeller().getUsername());
        assertTrue(item.getBids().size() > 0);
        tx.commit();
        em.close();
    } finally {
        TM.rollback();
    }
}