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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        Transaction tx = odmg.newTransaction();


        tx.begin();


        // 4. acquire write lock on new object
        tx.lock(newProduct, Transaction.WRITE);


        // 5. commit transaction
        tx.commit();
    }
}

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    {
        Implementation impl = OJB.getInstance();
        Transaction    tx   = impl.newTransaction();


        tx.begin();
        tx.lock(product, Transaction.WRITE);
        tx.commit();
    }


    /**
     * Finds the product with the given name.

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        Implementation impl = OJB.getInstance();
        Transaction    tx   = impl.newTransaction();


        tx.begin();


        tx.lock(product, Transaction.WRITE);
        product.setStock(product.getStock() -  number);


        tx.commit();
    }

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            Master master_1 = populatedMasterFKinPK(tx, 7, timestamp);
            Master master_2 = populatedMasterFKinPK(tx, 6, timestamp);
            Master master_3 = populatedMasterFKnoPK(tx, 7, timestamp);
            Master master_4 = populatedMasterFKnoPK(tx, 6, timestamp);


            tx.lock(master_1, Transaction.WRITE);
            tx.lock(master_2, Transaction.WRITE);
            tx.lock(master_3, Transaction.WRITE);
            tx.lock(master_4, Transaction.WRITE);
            tx.commit();

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            Master master_2 = populatedMasterFKinPK(tx, 6, timestamp);
            Master master_3 = populatedMasterFKnoPK(tx, 7, timestamp);
            Master master_4 = populatedMasterFKnoPK(tx, 6, timestamp);


            tx.lock(master_1, Transaction.WRITE);
            tx.lock(master_2, Transaction.WRITE);
            tx.lock(master_3, Transaction.WRITE);
            tx.lock(master_4, Transaction.WRITE);
            tx.commit();


            tx.begin();

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            Master master_3 = populatedMasterFKnoPK(tx, 7, timestamp);
            Master master_4 = populatedMasterFKnoPK(tx, 6, timestamp);


            tx.lock(master_1, Transaction.WRITE);
            tx.lock(master_2, Transaction.WRITE);
            tx.lock(master_3, Transaction.WRITE);
            tx.lock(master_4, Transaction.WRITE);
            tx.commit();


            tx.begin();
            OQLQuery query = odmg.newOQLQuery();

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            Master master_4 = populatedMasterFKnoPK(tx, 6, timestamp);


            tx.lock(master_1, Transaction.WRITE);
            tx.lock(master_2, Transaction.WRITE);
            tx.lock(master_3, Transaction.WRITE);
            tx.lock(master_4, Transaction.WRITE);
            tx.commit();


            tx.begin();
            OQLQuery query = odmg.newOQLQuery();
            query.create("select masters from " + Master.class.getName() + " where masterText like $1");

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        /* One possibility of storing objects is to use the current transaction
         associated with the container */
        Transaction tx = odmg.currentTransaction();
        for (Iterator iterator = objects.iterator(); iterator.hasNext();)
        {
            tx.lock(iterator.next(), Transaction.WRITE);
        }
        return objects;
    }


    /**

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