Examples with Item org.jpwh.model.cache.Item used on opensource projects

Example 1 with Item

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

the class SecondLevel method cacheBehavior.

@Test
public void cacheBehavior() throws Exception {
    CacheTestData testData = storeTestData();
    Long USER_ID = testData.users.getFirstId();
    Long ITEM_ID = testData.items.getFirstId();
    UserTransaction tx = TM.getUserTransaction();
    try {
        {
            tx.begin();
            EntityManager em = JPA.createEntityManager();
            // Get the statistics API
            Statistics stats = JPA.getEntityManagerFactory().unwrap(SessionFactory.class).getStatistics();
            SecondLevelCacheStatistics itemCacheStats = stats.getSecondLevelCacheStatistics(Item.class.getName());
            assertEquals(itemCacheStats.getElementCountInMemory(), 3);
            assertEquals(itemCacheStats.getHitCount(), 0);
            // Hit the second-level cache with entity lookup by identifier
            Item item = em.find(Item.class, ITEM_ID);
            assertEquals(itemCacheStats.getHitCount(), 1);
            // Initializing a proxy will also hit the second-level cache
            SecondLevelCacheStatistics userCacheStats = stats.getSecondLevelCacheStatistics(User.class.getName());
            assertEquals(userCacheStats.getElementCountInMemory(), 3);
            assertEquals(userCacheStats.getHitCount(), 0);
            User seller = item.getSeller();
            // Initialize proxy
            assertEquals(seller.getUsername(), "johndoe");
            assertEquals(userCacheStats.getHitCount(), 1);
            // Get the Item#bids collection and its referenced Bid entity instances
            /* 
                   The statistics tell you that there are three <code>Item#bids</code>
                   collections in the cache (one for each <code>Item</code>). No
                   successful cache lookups have occurred so far.
                 */
            SecondLevelCacheStatistics bidsCacheStats = stats.getSecondLevelCacheStatistics(Item.class.getName() + ".bids");
            assertEquals(bidsCacheStats.getElementCountInMemory(), 3);
            assertEquals(bidsCacheStats.getHitCount(), 0);
            /* 
                   The entity cache of <code>Bid</code> has five records, and you
                   haven't accessed it either.
                 */
            SecondLevelCacheStatistics bidCacheStats = stats.getSecondLevelCacheStatistics(Bid.class.getName());
            assertEquals(bidCacheStats.getElementCountInMemory(), 5);
            assertEquals(bidCacheStats.getHitCount(), 0);
            /* 
                   Initializing the collection will read the data from both caches.
                 */
            Set<Bid> bids = item.getBids();
            assertEquals(bids.size(), 3);
            /* 
                   The cache found one collection, as well as the data for
                   its three <code>Bid</code> elements.
                 */
            assertEquals(bidsCacheStats.getHitCount(), 1);
            assertEquals(bidCacheStats.getHitCount(), 3);
            tx.commit();
            em.close();
        }
    } finally {
        TM.rollback();
    }
}

Example 2 with Item

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

the class SecondLevel method storeTestData.

public CacheTestData 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();
    // Warm up the cache properly
    tx.begin();
    em = JPA.createEntityManager();
    // We load all the User instances into the second-level cache
    // here because NONSTRICT_READ_WRITE strategy doesn't insert
    // them into the second-level cache when persist() is called,
    // only when they are loaded from the database. And we need
    // to do this in a new transaction, or TwoPhaseLoad doesn't
    // put it in the cache.
    em.createQuery("select u from User u").getResultList();
    // collection is loaded.
    for (Long itemId : itemIds) {
        em.find(Item.class, itemId).getBids().size();
    }
    tx.commit();
    em.close();
    JPA.getEntityManagerFactory().unwrap(SessionFactory.class).getStatistics().clear();
    CacheTestData testData = new CacheTestData();
    testData.items = new TestData(itemIds);
    testData.users = new TestData(userIds);
    return testData;
}

Example 3 with Item

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

the class SecondLevel method cacheModes.

@Test
public void cacheModes() throws Exception {
    CacheTestData testData = storeTestData();
    Long USER_ID = testData.users.getFirstId();
    Long ITEM_ID = testData.items.getFirstId();
    UserTransaction tx = TM.getUserTransaction();
    try {
        {
            tx.begin();
            EntityManager em = JPA.createEntityManager();
            Statistics stats = JPA.getEntityManagerFactory().unwrap(SessionFactory.class).getStatistics();
            SecondLevelCacheStatistics itemCacheStats = stats.getSecondLevelCacheStatistics(Item.class.getName());
            // Bypass the cache when retrieving an entity instance by identifier
            {
                Map<String, Object> properties = new HashMap<String, Object>();
                properties.put("javax.persistence.cache.retrieveMode", CacheRetrieveMode.BYPASS);
                // Hit the database
                Item item = em.find(Item.class, ITEM_ID, properties);
                assertEquals(itemCacheStats.getHitCount(), 0);
            }
            // Bypass the cache when storing an entity instance
            assertEquals(itemCacheStats.getElementCountInMemory(), 3);
            em.setProperty("javax.persistence.cache.storeMode", CacheStoreMode.BYPASS);
            Item item = new Item(// ...
            "Some Item", CalendarUtil.TOMORROW.getTime(), em.find(User.class, USER_ID));
            // Not stored in the cache
            em.persist(item);
            em.flush();
            // Unchanged
            assertEquals(itemCacheStats.getElementCountInMemory(), 3);
            tx.commit();
            em.close();
        }
    } finally {
        TM.rollback();
    }
}