Examples of javax.persistence.EntityManager.lock()

javax.persistence.EntityManager.lock()
Set the lock mode for an entity object contained in the persistence context. @param entity @param lockMode @throws IllegalStateException if this EntityManager has been closed @throws PersistenceException if an unsupported lock callis made @throws IllegalArgumentException if the instance is notan entity or is a detached entity @throws TransactionRequiredException if there is notransaction

                    log.trace("Employee=" + employee);
                    Map<String, Object> lockProps = buildPropsMap(args, 3);
                    if (lockProps != null) {
                        em.lock(employee, lockMode, lockProps);
                    } else {
                        em.lock(employee, lockMode);
                    }
                    break;
                case LockObject:
                    em.lock(args[1], (LockModeType) args[2]);
                    break;

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                    } else {
                        em.lock(employee, lockMode);
                    }
                    break;
                case LockObject:
                    em.lock(args[1], (LockModeType) args[2]);
                    break;
                case UpdateEmployee:
                    id = 1;
                    if (args.length > 1) {
                        id = (Integer) args[1];

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                case Trace:
                    log.trace(args[1]);
                    break;


                case Test:
                    em.lock("xxx", LockModeType.WRITE);
                    break;
                default:
                }
            } catch (Exception ex) {
                // only remember the first exception caught

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                    }
                    employee = employees.get(id);
                    log.trace("Employee=" + employee);
                    Map<String, Object> lockProps = buildPropsMap(args, 3);
                    if (lockProps != null) {
                        em.lock(employee, lockMode, lockProps);
                    } else {
                        em.lock(employee, lockMode);
                    }
                    break;
                case LockObject:

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    try {
      tx.begin();
      org.apache.juddi.model.Subscription modelSubscription = em.find(org.apache.juddi.model.Subscription.class, resultList.getSubscription().getSubscriptionKey());
      log.debug("Taking out a write lock on this subscription, and bail if we can't get it since that would mean" 
       + " another jUDDI instance is in the process of sending out the notification.");
      em.lock(modelSubscription, LockModeType.WRITE);
      Date startPoint = resultList.getCoveragePeriod().getStartPoint().toGregorianCalendar().getTime();
      Date endPoint   = resultList.getCoveragePeriod().getEndPoint().toGregorianCalendar().getTime();
      if (modelSubscription.getLastNotified()!=null 
          && startPoint.before(modelSubscription.getLastNotified()) 
          && endPoint.after(modelSubscription.getLastNotified())) {

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    }


    public void lock(Object o, LockModeType lockModeType) {
        EntityManager entityManager = getEntityManager(false);
        if (entityManager != null) {
             entityManager.lock(o, lockModeType);
        } else {
            entityManager = createEntityManager();
            try {
                 entityManager.lock(o, lockModeType);
            } finally {

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        if (entityManager != null) {
             entityManager.lock(o, lockModeType);
        } else {
            entityManager = createEntityManager();
            try {
                 entityManager.lock(o, lockModeType);
            } finally {
                entityManager.close();
            }
        }
    }

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    em.persist( lock );
    em.getTransaction().commit();


    em.getTransaction().begin();
    lock = em.getReference( Lock.class, lock.getId() );
    em.lock( lock, LockModeType.READ );
    lock.setName( "surname" );
    em.getTransaction().commit();


    em.getTransaction().begin();
    lock = em.find( Lock.class, lock.getId() );

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    em.getTransaction().commit();


    em.getTransaction().begin();
    lock = em.getReference( Lock.class, lock.getId() );
    Integer version = lock.getVersion();
    em.lock( lock, LockModeType.WRITE );
    em.getTransaction().commit();


    em.getTransaction().begin();
    lock = em.getReference( Lock.class, lock.getId() );
    try {

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    }
    catch (TransactionRequiredException e) {
      //success
    }
    try {
      em.lock( book, LockModeType.READ );
      fail( "lock has to be inside a Tx" );
    }
    catch (TransactionRequiredException e) {
      //success
    }

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