package net.jeffrey.hibernate.history;import java.util.List;import javax.persistence.EntityManager;import javax.persistence.Persistence;import net.jeffrey.hibernate.Category;import net.jeffrey.hibernate.Product;import org.junit.After;import org.junit.Before;import org.junit.Test;import static org.junit.Assert.*;import static net.jeffrey.hibernate.history.OperationType.*;/** * Hibernate 審計日志測試用例 * @author jeffrey */public class HibernateHistoryTest {    private EntityManager em;    public HibernateHistoryTest() {    }    @Before    public void setUp() {        em = Persistence.createEntityManagerFactory("HibernateAuditHistoryPU").createEntityManager();    }    @After    public void tearDown() {        em.close();    }    @Test    // 測試審計日志：創建對象    public void testCreateHistory() {        Product p = new Product();        p.setName("Hibernate in Action");        // 保存新商品        em.getTransaction().begin();        em.persist(p);        em.getTransaction().commit();                // 查找該對象關聯的操作日志        List<HistoryEntry> list = em.createNamedQuery("HistoryEntry.findByEntity")                .setParameter("entity", Product.class)                .setParameter("entityId", p.getId()).getResultList();        assertEquals(1, list.size());        HistoryEntry h = list.get(0);        // 日志關聯的實體類型與商品類應該相同        assertEquals(Product.class.getName(), h.getEntity().getName());        // 測試日志關聯的實體id是否正確        assertEquals(p.getId(), h.getEntityId());        // 該日志的操作類型應該是CREATE類型        assertEquals(CREATE, h.getOperationType());        // 測試是否正確生成了日期戳        assertNotNull(h.getTimestamp());    }    @Test    // 測試審計日志：簡單屬性的更新    public void testUpdatePropertyHistory() {        Product p = em.find(Product.class, 1);        assertNotNull(p);        assertEquals("Core Java", p.getName());        p.setName("Core Java I");        em.getTransaction().begin();        em.merge(p);        em.getTransaction().commit();        HistoryEntry h = (HistoryEntry) em.createNamedQuery("HistoryEntry.findByEntity")                .setParameter("entity", Product.class)                .setParameter("entityId", p.getId()).getSingleResult();        assertEquals(Product.class.getName(), h.getEntity().getName());        assertEquals(p.getId(), h.getEntityId());        assertEquals(UPDATE, h.getOperationType());        // 更新的屬性是name        assertEquals("name", h.getProperty());        // 更新前的值        assertEquals("Core Java", h.getPreviousValue());        // 更新后的值        assertEquals("Core Java I", h.getNewValue());        assertNotNull(h.getTimestamp());    }        @Test    // 測試審計日志：更新值與舊值相同    public void testUpdatePropertyBySameValue() {        Product p = em.find(Product.class, 2);        assertNotNull(p);        assertEquals("JSF in Action", p.getName());        em.getTransaction().begin();        // 更新的值與原有值一樣        p.setName("JSF in Action");        em.merge(p);        em.getTransaction().commit();                List list = em.createNamedQuery("HistoryEntry.findByEntity")                .setParameter("entity", Product.class)                .setParameter("entityId", p.getId()).getResultList();        // 并沒有實際更新值，不應該生成審計日志        assertTrue(list.isEmpty());    }        @Test    // 測試審計日志：多對一的關聯對象的更新    public void testUpdateManyToOneMappingHistory() {        Product p = em.find(Product.class, 3);        assertEquals("iPhone", p.getName());        Category c1 = p.getCategory();        assertEquals("Mobile phone", c1.getName());        Category c2 = em.find(Category.class, 5);        assertEquals("Toy", c2.getName());        em.getTransaction().begin();        // 變更該商品的類別，商品和類別是many to one        p.setCategory(c2);        em.merge(p);        em.getTransaction().commit();                HistoryEntry h = (HistoryEntry)em.createNamedQuery("HistoryEntry.findByEntity")                .setParameter("entity", Product.class)                .setParameter("entityId", p.getId()).getSingleResult();        assertEquals(Product.class.getName(), h.getEntity().getName());        assertEquals(UPDATE, h.getOperationType());        // 更新的屬性是category        assertEquals("category", h.getProperty());        // 原有值應該是該商品原有類別的id        assertEquals(c1.getId().toString(), h.getPreviousValue());        // 新值應該是新類別的id        assertEquals(c2.getId().toString(), h.getNewValue());    }        @Test    // 測試審計日志：一對多的關聯對象的更新    public void testUpdateOneToManyMappingHistory() {        Category c = em.find(Category.class, 6);        assertEquals("Car", c.getName());        assertEquals(2, c.getProducts().size());        Product p = c.getProducts().get(1);        assertEquals("SU-27", p.getName());                em.getTransaction().begin();        // 從一個類別Car中去除一個商品SU-27，類別和商品是 one to many        c.removeProduct(p);        em.merge(c);        em.getTransaction().commit();                List list = em.createNamedQuery("HistoryEntry.findByEntity")                .setParameter("entity", Category.class)                .setParameter("entityId", c.getId()).getResultList();        // 在category和product的一對多關聯中，product是主控端，hibernate只會觸發與product關聯的更新事件        // 所以category沒有關聯該次更新操作的審計日志        assertTrue(list.isEmpty());        HistoryEntry h = (HistoryEntry) em.createNamedQuery("HistoryEntry.findByEntity")                .setParameter("entity", Product.class)                .setParameter("entityId", p.getId()).getSingleResult();        assertNotNull(h);        // 但是，類別Car刪除商品SU-27，商品SU-27與類別Car解除了關聯關系。則會生成相應的更新審計日志        assertEquals(Product.class.getName(), h.getEntity().getName());        assertEquals(p.getId(), h.getEntityId());        assertEquals("category", h.getProperty());        assertEquals(UPDATE, h.getOperationType());        assertEquals(c.getId().toString(), h.getPreviousValue());        assertNull(h.getNewValue());    }    @Test    // 測試審計日志：刪除對象    public void testDeleteHistory() {        Product p = em.find(Product.class, 2);        assertNotNull(p);        assertEquals("JSF in Action", p.getName());        em.getTransaction().begin();        em.remove(p);        em.getTransaction().commit();        assertNull(em.find(Product.class, 2));        HistoryEntry h = (HistoryEntry) em.createNamedQuery("HistoryEntry.findByEntity")                .setParameter("entity", Product.class)                .setParameter("entityId", p.getId()).getSingleResult();        // 實體對象已經刪除，但是通過其id仍然可以訪問到操作歷史的記錄        assertEquals(Product.class.getName(), h.getEntity().getName());        assertEquals(DELETE, h.getOperationType());        assertNotNull(h.getTimestamp());    }        @Test    // 測試審計日志：級聯刪除對象    public void testCascadeDeleteHistory() {        Category c = em.find(Category.class, 2);        assertEquals("Movie", c.getName());        em.getTransaction().begin();        em.remove(c);        em.getTransaction().commit();                // category 和 product是級聯一對多的關系，如果刪除了category，會生成相應的所有關聯對象的刪除操作日志        HistoryEntry h1 = (HistoryEntry) em.createNamedQuery("HistoryEntry.findByEntity")                .setParameter("entity", Product.class)                .setParameter("entityId", 6).getSingleResult();        assertNotNull(h1);        assertEquals(DELETE, h1.getOperationType());        HistoryEntry h2 = (HistoryEntry) em.createNamedQuery("HistoryEntry.findByEntity")                .setParameter("entity", Product.class)                .setParameter("entityId", 7).getSingleResult();        assertNotNull(h2);        assertEquals(DELETE, h2.getOperationType());        HistoryEntry h3 = (HistoryEntry) em.createNamedQuery("HistoryEntry.findByEntity")                .setParameter("entity", Category.class)                .setParameter("entityId", 2).getSingleResult();        assertEquals(DELETE, h3.getOperationType());    }}