Examples of org.hibernate.Session.lock()

org.hibernate.Session.lock()
Obtain the specified lock level upon the given object. This may be used to perform a version check (LockMode.READ), to upgrade to a pessimistic lock (LockMode.UPGRADE), or to simply reassociate a transient instance with a session (LockMode.NONE). This operation cascades to associated instances if the association is mapped with cascade="lock". @param object a persistent or transient instance @param lockMode the lock level @throws HibernateException

          // obtain update lock by default (LockMode.UPGRADE)
          LockMode lockMode = parentLockMode != null ? LockMode.parse(parentLockMode)
              : LockMode.UPGRADE;
          log.debug("acquiring " + lockMode + " lock on " + parentToken);
          // lock updates as appropriate, no need to flush here
          session.lock(parentToken, lockMode);
        }


        boolean reactivateParent = true;


        // if this is a discriminator

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    Session s = factory.openSession();
    Transaction tx=null;
    try {
      tx = s.beginTransaction();


      s.lock(item, LockMode.NONE);
      s.lock(bidder, LockMode.NONE);


      Bid bid = new Bid();
      bid.setBidder(bidder);
      bid.setDatetime( new Date() );

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    Transaction tx=null;
    try {
      tx = s.beginTransaction();


      s.lock(item, LockMode.NONE);
      s.lock(bidder, LockMode.NONE);


      Bid bid = new Bid();
      bid.setBidder(bidder);
      bid.setDatetime( new Date() );
      bid.setAmount(amount);

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    session.close();
    
    
    session = openSession();
    t = session.beginTransaction();
    session.lock(prod, LockMode.READ);
    prod.getParts().remove(part);
    t.commit();
    session.close();
    
    session = openSession();

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    session.close();




    session = openSession();
    t = session.beginTransaction();
    session.lock(prod, LockMode.READ);
    prod.getParts().remove(mapKey);
    t.commit();
    session.close();


    session = openSession();

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    t.commit();
    s.close();


    s = openSession();
    t = s.beginTransaction();
    s.lock( p, LockMode.UPGRADE );
    s.lock( q, LockMode.UPGRADE );
    s.delete( p );
    s.delete( q );
    t.commit();
    s.close();

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    s.close();


    s = openSession();
    t = s.beginTransaction();
    s.lock( p, LockMode.UPGRADE );
    s.lock( q, LockMode.UPGRADE );
    s.delete( p );
    s.delete( q );
    t.commit();
    s.close();

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    // do the isolated update
    s1 = getSessions().openSession();
    t1 = s1.beginTransaction();
    item = (Item) s1.get( Item.class, itemId );
    s1.lock( item, LockMode.UPGRADE );
    item.setName( "updated" );
    s1.flush();


    Session s2 = getSessions().openSession();
    Transaction t2 = s2.beginTransaction();

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    long initialVersion = item.getVersion();


    s1 = getSessions().openSession();
    t1 = s1.beginTransaction();
    item = (Item) s1.get( Item.class, itemId );
    s1.lock( item, LockMode.FORCE );
    assertEquals( "no forced version increment", initialVersion + 1, item.getVersion() );


    myEntity = (MyEntity) s1.get( MyEntity.class, myEntity.getId() );
    s1.lock( myEntity, LockMode.FORCE );
    assertTrue( "LockMode.FORCE on a un-versioned entity should degrade nicely to UPGRADE", true );

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    item = (Item) s1.get( Item.class, itemId );
    s1.lock( item, LockMode.FORCE );
    assertEquals( "no forced version increment", initialVersion + 1, item.getVersion() );


    myEntity = (MyEntity) s1.get( MyEntity.class, myEntity.getId() );
    s1.lock( myEntity, LockMode.FORCE );
    assertTrue( "LockMode.FORCE on a un-versioned entity should degrade nicely to UPGRADE", true );


    s1.lock( item, LockMode.FORCE );
    assertEquals( "subsequent LockMode.FORCE did not no-op", initialVersion + 1, item.getVersion() );

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