Examples of javax.persistence.EntityManager

javax.persistence.EntityManager
Interface used to interact with the persistence context. An EntityManager instance is associated with a persistence context. A persistence context is a set of entity instances in which for any persistent entity identity there is a unique entity instance. Within the persistence context, the entity instances and their lifecycle are managed. This interface defines the methods that are used to interact with the persistence context. The EntityManager API is used to create and remove persistent entity instances, to find entities by their primary key, and to query over entities. The set of entities that can be managed by a given EntityManager instance is defined by a persistence unit. A persistence unit defines the set of all classes that are related or grouped by the application, and which must be colocated in their mapping to a single database. @author Emmanuel Bernard

    @Test
    public void findAllComments() throws Exception {
        new FacesRequest() {


            protected void invokeApplication() throws Exception {
                EntityManager em = (EntityManager) getInstance("restrictedEntityManager");
                WikiDocument d = (WikiDocument)
                        em.createQuery("select d from WikiDocument d where d.id = :id")
                                .setParameter("id", 6l)
                                .getSingleResult();
                assert d.getName().equals("One");


                List<WikiComment> comments =
                        em.createQuery("select c from WikiComment c where c.parent = :doc order by c.createdOn asc")
                        .setParameter("doc", d)
                        .getResultList();


                assert comments.size() == 6;

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    @Test
    public void insertCommentNewThread() throws Exception {
        new FacesRequest() {


            protected void invokeApplication() throws Exception {
                EntityManager em = (EntityManager) getInstance("restrictedEntityManager");
                WikiDocument d = (WikiDocument)
                        em.createQuery("select d from WikiDocument d where d.id = :id")
                                .setParameter("id", 6l)
                                .getSingleResult();
                assert d.getName().equals("One");


                WikiComment newComment = new WikiComment();


                newComment.setAreaNumber(d.getAreaNumber());
                newComment.setDerivedName(d);
                newComment.setWikiname(WikiUtil.convertToWikiName(newComment.getName()));
                newComment.setCreatedBy(em.find(User.class, 1l));


                newComment.setSubject("Seven");
                newComment.setContent("Testcomment Seven");
                newComment.setUseWikiText(true);


                newComment.setParent(d);


                em.persist(newComment);


                em.flush();
                em.clear();


                List<WikiComment> comments =
                        em.createQuery("select c from WikiComment c where c.parent = :doc order by c.createdOn asc")
                        .setParameter("doc", d)
                        .getResultList();


                assert comments.size() == 7;

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    @Test
    public void findCommentParent() throws Exception {
        new FacesRequest() {


            protected void invokeApplication() throws Exception {
                EntityManager em = (EntityManager) getInstance("restrictedEntityManager");
                WikiComment comment  = (WikiComment)
                        em.createQuery("select c from WikiComment c where c.id = :id")
                                .setParameter("id", 13l)
                                .getSingleResult();
                assert comment.getSubject().equals("Four");
                assert comment.getParent().getId().equals(6l);
                assertEquals(comment.getPermURL(".lace"), "6.lace#comment13");

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    @Test
    public void loadDirectoryById() throws Exception {
        new FacesRequest() {


            protected void invokeApplication() throws Exception {
                EntityManager em = (EntityManager) getInstance("restrictedEntityManager");
                WikiDirectory d = (WikiDirectory)
                        em.createQuery("select d from WikiDirectory d where d.id = :id")
                                .setParameter("id", 1l)
                                .getSingleResult();
                assert d.getName().equals("AAA");
            }
        }.run();

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    @Test
    public void getDirectoryPath() throws Exception {
        new FacesRequest() {


            protected void invokeApplication() throws Exception {
                EntityManager em = (EntityManager) getInstance("restrictedEntityManager");
                WikiDirectory d = (WikiDirectory)
                        em.createQuery("select d from WikiDirectory d where d.id = :id")
                                .setParameter("id", 4l)
                                .getSingleResult();
                assert d.getName().equals("DDD");
                assert d.getPath().size() == 3;
                assert d.getPath().get(0).getId().equals(1l);

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    @Test
    public void updateDirectoryById() throws Exception {
        new FacesRequest() {


            protected void invokeApplication() throws Exception {
                EntityManager em = (EntityManager) getInstance("restrictedEntityManager");
                WikiDirectory d = (WikiDirectory)
                        em.createQuery("select d from WikiDirectory d where d.id = :id")
                                .setParameter("id", 1l)
                                .getSingleResult();
                d.setName("AAA2");
                em.flush();


                em.clear();
                d = (WikiDirectory)
                        em.createQuery("select d from WikiDirectory d where d.id = :id")
                                .setParameter("id", 1l)
                                .getSingleResult();
                assert d.getName().equals("AAA2");
            }
        }.run();

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    @Test
    public void insertDirectoryById() throws Exception {
        new FacesRequest() {


            protected void invokeApplication() throws Exception {
                EntityManager em = (EntityManager) getInstance("restrictedEntityManager");
                WikiDirectory d = (WikiDirectory)
                        em.createQuery("select d from WikiDirectory d where d.id = :id")
                                .setParameter("id", 3l)
                                .getSingleResult();


                WikiDirectory newDir = new WikiDirectory();
                newDir.setName("FFF");
                newDir.setWikiname("FFF");
                newDir.setAreaNumber(d.getAreaNumber());
                newDir.setCreatedBy(em.find(User.class, 1l));
                newDir.setParent(d);


                em.persist(newDir);
                em.flush();


                em.clear();
                d = (WikiDirectory)
                        em.createQuery("select d from WikiDirectory d where d.id = :id")
                                .setParameter("id", 1l)
                                .getSingleResult();
                assert d.getName().equals("AAA");


                em.clear();
                d = (WikiDirectory)
                        em.createQuery("select d from WikiDirectory d where d.id = :id")
                                .setParameter("id", 3l)
                                .getSingleResult();
                assert d.getName().equals("CCC");


                em.clear();
                d = (WikiDirectory)
                        em.createQuery("select d from WikiDirectory d where d.id = :id")
                                .setParameter("id", newDir.getId())
                                .getSingleResult();
                assert d.getName().equals("FFF");
            }
        }.run();

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    @Test
    public void findParents() throws Exception {
        new FacesRequest() {


            protected void invokeApplication() throws Exception {
                EntityManager em = (EntityManager) getInstance("restrictedEntityManager");
                WikiDirectory d = (WikiDirectory)
                        em.createQuery("select d from WikiDirectory d where d.id = :id")
                                .setParameter("id", 4l)
                                .getSingleResult();


                List<WikiDirectory> parents = d.getParentsRecursive();


                Assert.assertEquals(parents.size(), 2);
                Assert.assertEquals(parents.get(0).getId(), new Long(3));
                Assert.assertEquals(parents.get(1).getId(), new Long(1));
            }
        }.run();


        new FacesRequest() {


            protected void invokeApplication() throws Exception {
                EntityManager em = (EntityManager) getInstance("restrictedEntityManager");
                WikiDirectory d = (WikiDirectory)
                        em.createQuery("select d from WikiDirectory d where d.id = :id")
                                .setParameter("id", 3l)
                                .getSingleResult();


                List<WikiDirectory> parents = d.getParentsRecursive();

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            progress.setStatus("Purging index");
            log.debug("deleting indexed documents of entity: " + entityClass.getName());
            userTx = (UserTransaction)org.jboss.seam.Component.getInstance("org.jboss.seam.transaction.transaction");
            userTx.begin();


            EntityManager em = (EntityManager) Component.getInstance("entityManager");
            FullTextSession ftSession = (FullTextSession)em.getDelegate();


            // Delete all documents with "_hibernate_class" term of the selected entity
            DirectoryProvider dirProvider = ftSession.getSearchFactory().getDirectoryProviders(entityClass)[0];
            IndexReader reader = IndexReader.open(dirProvider.getDirectory());


            // TODO: This is using an internal term of HSearch
            reader.deleteDocuments(new Term("_hibernate_class", entityClass.getName()));
            reader.close();


            // Optimize index
            progress.setStatus("Optimizing index");
            log.debug("optimizing index (merging segments)");
            ftSession.getSearchFactory().optimize(entityClass);


            userTx.commit();


            progress.setStatus("Building index");
            log.debug("indexing documents in batches of: " + batchSize);


            // Now re-index with HSearch
            em = (EntityManager) Component.getInstance("entityManager");
            ftSession = (FullTextSession)em.getDelegate();


            // TODO: Let's run this in auto-commit mode, assuming we have READ COMMITTED isolation anyway and non-repeatable reads
            //userTx.setTransactionTimeout(3600);
            //userTx.begin();

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    }


    @Factory(value = "wikiRoot", scope = ScopeType.PAGE, autoCreate = true)
    public WikiDirectory loadWikiRoot() {
        log.debug("loading wiki root");
        EntityManager em = (EntityManager)Component.getInstance("entityManager");
        try {
            return (WikiDirectory) em
                    .createQuery("select d from WikiDirectory d left join fetch d.feed where d.parent is null")
                    .setHint("org.hibernate.comment", "Loading wikiRoot")
                    .setHint("org.hibernate.cacheable", false)
                    .getSingleResult();
        } catch (RuntimeException ex) {

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