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.

        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, "##new ref 1_" + nameRef);
        CollectionReference ref_6 = new CollectionReference(null, "##new ref 2_" + 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);
        references = obj_2.getAllReferences();
        assertNotNull(references);

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        // add new reference to object
        CollectionReference ref_5 = new CollectionReference(null, "##new ref 1_" + nameRef);
        CollectionReference ref_6 = new CollectionReference(null, "##new ref 2_" + 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);
        references = obj_2.getAllReferences();
        assertNotNull(references);
        assertEquals("1 references expected for object: "+obj_2, 1, references.size());

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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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        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();


        obj_1 = (MainObject) broker.getObjectByIdentity(oid_1);

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        // now update reference
        obj_2 = (MainObject) broker.getObjectByIdentity(oid_2);
        assertNotNull(obj_2);
        tx.begin();
        tx.lock(obj_2, Transaction.WRITE);
        references = obj_2.getAllReferences();
        CollectionReference ref = (CollectionReference) references.get(0);
        tx.lock(ref, Transaction.WRITE);
        ref.setRefName(nameRef+"_update");
        tx.commit();

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        assertNotNull(obj_2);
        tx.begin();
        tx.lock(obj_2, Transaction.WRITE);
        references = obj_2.getAllReferences();
        CollectionReference ref = (CollectionReference) references.get(0);
        tx.lock(ref, Transaction.WRITE);
        ref.setRefName(nameRef+"_update");
        tx.commit();


        obj_2 = (MainObject) broker.getObjectByIdentity(oid_2);
        assertNotNull(obj_2);

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        site = new Site();
        site.setName(name);
        site.setYear(new Integer(year));
        site.setSemester(new Integer(semester));


        tx.lock(site, Transaction.WRITE);
        tx.commit();
    }


    public void testSimpleQueryDelete() throws Exception
    {

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        Site site = new Site();
        site.setName(name);
        Transaction tx = odmg.newTransaction();
        tx.begin();
        tx.lock(site, Transaction.WRITE);
        tx.commit();


        OQLQuery query = odmg.newOQLQuery();
        query.create("select sites from " + Site.class.getName() + " where name=$1");
        query.bind(name);

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