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

    public void persist(Event event) {


        try {


            // get entity manager
            EntityManager entityManager = defaultLocator.locate();


            // It's managed by JACORB
            // Hence we don't deal with the TX here            
            entityManager.persist(event);


        } catch (Exception e) {
            log.error("Error persisting event", e);
        }

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                                Notification notification,
                                List<OrganizationalEntity> recipients,
                                List<OrganizationalEntity> businessAdministrators,
                                WorkItemManager workItemManager,
                                EntityManagerFactory emf) {
        EntityManager em = emf.createEntityManager();
        
        TaskData taskData = task.getTaskData();
        
        // First compile the associated document, we assume this returns a single structure
        // That can be used in the main work item evaluation.
        Content content = null;
        if ( taskData.getDocumentAccessType() == AccessType.Inline ) {
            content = em.find( Content.class,
                               taskData.getDocumentContentId() );
        }
        ExpressionCompiler compiler = new ExpressionCompiler( new String( content.getContent() ) );
        Serializable expr = compiler.compile();
        Object object = MVEL.executeExpression( expr );

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        this.escalatedDeadlineHandler = escalatedDeadlineHandler;
    }


    public void executeEscalatedDeadline(long taskId,
                                         long deadlineId) {
        EntityManager localEm = emf.createEntityManager();
        Task task = localEm.find(Task.class,
                taskId);
        Deadline deadline = localEm.find(Deadline.class,
                deadlineId);


        if (escalatedDeadlineHandler == null) {
            escalatedDeadlineHandler = new DefaultEscalatedDeadlineHandler();
        }


        escalatedDeadlineHandler.executeEscalatedDeadline(task,
                deadline,
                localEm,
                this);
        localEm.close();
    }

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        Reader reader = new InputStreamReader( TaskServiceEscalationBaseTest.class.getResourceAsStream( "../QueryData_UnescalatedDeadlines.mvel" ) );
        List<Task> tasks = (List<Task>) eval( reader,
                                              vars );
        long now = ((Date)vars.get( "now" )).getTime();
        
        EntityManager em = emf.createEntityManager();
        em.getTransaction().begin();
        for ( Task task : tasks ) {
            // for this one we put the task in directly;
            em.persist( task );
        }
        em.getTransaction().commit();


        // now create a new service, to see if it initiates from the DB correctly
        MockEscalatedDeadlineHandler handler = new MockEscalatedDeadlineHandler();
        TaskService local = new TaskService(emf, SystemEventListenerFactory.getSystemEventListener(), handler);

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    public void testPersistenceVariables() throws NamingException, NotSupportedException, SystemException, RollbackException, HeuristicMixedException, HeuristicRollbackException {
        MyEntity myEntity = new MyEntity("This is a test Entity with annotation in fields");
        MyEntityMethods myEntityMethods = new MyEntityMethods("This is a test Entity with annotations in methods");
        MyEntityOnlyFields myEntityOnlyFields = new MyEntityOnlyFields("This is a test Entity with annotations in fields and without accesors methods");
        MyVariableSerializable myVariableSerializable = new MyVariableSerializable("This is a test SerializableObject");
        EntityManager em = emf.createEntityManager();
        UserTransaction utx = (UserTransaction) new InitialContext().lookup( "java:comp/UserTransaction" );
        utx.begin();
        em.joinTransaction();
        em.persist(myEntity);
        em.persist(myEntityMethods);
        em.persist(myEntityOnlyFields);
        utx.commit();
        em.close();
        Environment env =  createEnvironment();
        KnowledgeBase kbase = createKnowledgeBase( "VariablePersistenceStrategyProcess.rf" );
        StatefulKnowledgeSession ksession = createSession( kbase, env );

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    public void testPersistenceVariablesWithTypeChange() throws NamingException, NotSupportedException, SystemException, RollbackException, HeuristicMixedException, HeuristicRollbackException {
        MyEntity myEntity = new MyEntity("This is a test Entity with annotation in fields");
        MyEntityMethods myEntityMethods = new MyEntityMethods("This is a test Entity with annotations in methods");
        MyEntityOnlyFields myEntityOnlyFields = new MyEntityOnlyFields("This is a test Entity with annotations in fields and without accesors methods");
        MyVariableSerializable myVariableSerializable = new MyVariableSerializable("This is a test SerializableObject");
        EntityManager em = emf.createEntityManager();
        UserTransaction utx = (UserTransaction) new InitialContext().lookup( "java:comp/UserTransaction" );
        utx.begin();
        em.joinTransaction();
        em.persist(myEntity);
        em.persist(myEntityMethods);
        em.persist(myEntityOnlyFields);
        utx.commit();
        em.close();
        Environment env = createEnvironment();
        KnowledgeBase kbase = createKnowledgeBase( "VariablePersistenceStrategyProcessTypeChange.rf" );
        StatefulKnowledgeSession ksession = createSession( kbase, env );

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        MyEntity myEntity = new MyEntity("This is a test Entity with annotation in fields");
        MyEntityMethods myEntityMethods = new MyEntityMethods("This is a test Entity with annotations in methods");
        MyEntityOnlyFields myEntityOnlyFields = new MyEntityOnlyFields("This is a test Entity with annotations in fields and without accesors methods");
        MyVariableSerializable myVariableSerializable = new MyVariableSerializable("This is a test SerializableObject");
        EntityManager em = emf.createEntityManager();
        UserTransaction utx = (UserTransaction) new InitialContext().lookup( "java:comp/UserTransaction" );
        utx.begin();
        em.joinTransaction();
        em.persist(myEntity);
        em.persist(myEntityMethods);
        em.persist(myEntityOnlyFields);
        utx.commit();
        em.close();
        Environment env = createEnvironment();
        KnowledgeBase kbase = createKnowledgeBase( "VariablePersistenceStrategySubProcess.rf" );
        StatefulKnowledgeSession ksession = createSession( kbase, env );

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    @Test
    public void testWorkItemWithVariablePersistence() throws Exception{
        MyEntity myEntity = new MyEntity("This is a test Entity");
        MyVariableSerializable myVariableSerializable = new MyVariableSerializable("This is a test SerializableObject");
        EntityManager em = emf.createEntityManager();
        UserTransaction utx = (UserTransaction) new InitialContext().lookup( "java:comp/UserTransaction" );
        utx.begin();
        
        em.joinTransaction();
        em.persist(myEntity);
        utx.commit();
        em.close();
        Environment env = createEnvironment();
        KnowledgeBase kbase = createKnowledgeBase( "VPSProcessWithWorkItems.rf" );
        StatefulKnowledgeSession ksession = createSession( kbase , env);

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  @Override
  public Object execute(Object[] parameters) {
    if (parameters.length == 0)
      return null;
    EntityManager em = getContext().getEntityManager();
    if (parameters[0].getClass().isArray()) {
      for (Object entity : (Object[]) parameters[0]) {
        em.persist(entity);
      }
    } else {
      em.persist(parameters[0]);
    }
    return null;
  }

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  @Override
  public Object execute(Object[] parameters) {
    if (parameters.length == 0)
      return null;
    EntityManager em = getContext().getEntityManager();
    if (parameters[0].getClass().isArray()) {
      for (Object entity : (Object[]) parameters[0]) {
        em.remove(entity);
      }
    } else {
      em.remove(parameters[0]);
    }
    return null;
  }

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