Examples of org.odmg.Transaction.lock()

org.odmg.Transaction.lock()
Upgrade the lock on the given object to the given lock mode. The call has no effect if the object's current lock is already at or above that level of lock mode. @param obj The object to acquire a lock on. @param lockMode The lock mode to acquire. The lock modes are READ,UPGRADE, and WRITE. @exception LockNotGrantedException Is thrown if the given lock mode could not be acquired.

        Transaction tx = odmg.newTransaction();
        tx.begin();
        // add objects to list
        for (int i = 0; i < 5; i++)
        {
            tx.lock(createObject(name), Transaction.WRITE);
        }
        tx.commit();


        tx.begin();
        // query test objects

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        // check result list size
        assertEquals(5, ret.size());
        // do read lock
        for (Iterator it = ret.iterator(); it.hasNext(); )
        {
            tx.lock(it.next(), Transaction.READ);
        }
        // create new list for results
        ArrayList result = new ArrayList();
        result.addAll(ret);
        tx.commit();

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            List   result     = (List)query.execute();
            Product toBeEdited = (Product)result.get(0);


            // 4. lock the product for write access
            tx.lock(toBeEdited, Transaction.WRITE);


            // 5. Edit the product entry
            System.out.println("please edit existing product");
            in = readLineWithMessage("enter name (was " + toBeEdited.getName() + "):");
            toBeEdited.setName(in);

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            // check whether object's class is persistence capable
            PersistenceBroker broker = ((HasBroker) tx).getBroker();
            broker.getClassDescriptor(object.getClass());
            // if a ClassDescriptor was found, OJB knows how to persist the object
            // lock object for write in tx
            tx.lock(object, Transaction.WRITE);
        }
        catch (
                org
                .apache
                .ojb

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        Database db = odmg.newDatabase();
        db.open(TestHelper.DEF_DATABASE_NAME, Database.OPEN_READ_WRITE);


        Transaction tx = odmg.newTransaction();
        tx.begin();
        tx.lock(obj_1, Transaction.WRITE);
        tx.lock(obj_2, Transaction.WRITE);
        tx.lock(obj_3, Transaction.WRITE);
        tx.commit();


        Criteria crit = new Criteria();

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        db.open(TestHelper.DEF_DATABASE_NAME, Database.OPEN_READ_WRITE);


        Transaction tx = odmg.newTransaction();
        tx.begin();
        tx.lock(obj_1, Transaction.WRITE);
        tx.lock(obj_2, Transaction.WRITE);
        tx.lock(obj_3, Transaction.WRITE);
        tx.commit();


        Criteria crit = new Criteria();
        crit.addEqualTo("name", name);

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        Transaction tx = odmg.newTransaction();
        tx.begin();
        tx.lock(obj_1, Transaction.WRITE);
        tx.lock(obj_2, Transaction.WRITE);
        tx.lock(obj_3, Transaction.WRITE);
        tx.commit();


        Criteria crit = new Criteria();
        crit.addEqualTo("name", name);
        QueryByCriteria query = QueryFactory.newQuery(MainObject.class, crit);

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        // add new reference to object
        CollectionReference ref_5 = new CollectionReference(null, nameRef);
        CollectionReference ref_6 = new CollectionReference(null, nameRef);
        tx.begin();
        tx.lock(obj_1, Transaction.WRITE);
        tx.lock(obj_2, Transaction.WRITE);
        obj_1.addReference(ref_5);
        obj_2.addReference(ref_6);
        tx.commit();
        assertNotNull(ref_5.getRefIdentifier());

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        // add new reference to object
        CollectionReference ref_5 = new CollectionReference(null, nameRef);
        CollectionReference ref_6 = new CollectionReference(null, nameRef);
        tx.begin();
        tx.lock(obj_1, Transaction.WRITE);
        tx.lock(obj_2, Transaction.WRITE);
        obj_1.addReference(ref_5);
        obj_2.addReference(ref_6);
        tx.commit();
        assertNotNull(ref_5.getRefIdentifier());
        assertNotNull(ref_6.getRefIdentifier());

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        assertEquals(id_1, obj_1.getIdentifier());
        assertEquals(id_2, obj_2.getIdentifier());


        // now update main objects
        tx.begin();
        tx.lock(obj_1, Transaction.WRITE);
        tx.lock(obj_2, Transaction.WRITE);
        obj_1.setName(name+"_update");
        obj_2.setName(name+"_update");
        tx.commit();

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