Examples of org.odmg.Transaction

org.odmg.Transaction
This interfaces provides the operations necessary to perform database transactions. All access, creation, and modification of persistent objects and their fields must be done within a transaction. Before performing any database operations, a thread must explicitly create a transaction object or associate itself with an existing transaction object (by calling join), and that transaction must be open (through a call to begin). All subsequent operations by the thread, including reads, writes, and lock acquisitions, are done under the thread�s current transaction.
A thread may only operate on its current transaction. For example, a TransactionNotInProgressException is thrown if a thread attempts to begin, commit, checkpoint, or abort a transaction prior to joining itself to that transaction.
A transaction is either open or closed. A transaction is open if a call has been made to begin, but no call has been made to commit or abort. Once commit or abort is called, the transaction is closed. The method isOpen can be called to determine the state of the transaction.
Read locks are implicitly obtained on objects as they are accessed. Write locks are implicitly obtained as objects are modified. Transaction objects are transient, they cannot be stored in the database. @author David Jordan (as Java Editor of the Object Data Management Group) @version ODMG 3.0 @see TransactionNotInProgressException

    }


    protected void setUp() throws Exception
    {
        super.setUp();
        Transaction tx = odmg.newTransaction();
        tx.begin();
        testProductGroup = new ProductGroup();
        testProductGroup.setGroupName("NamedRootsTest_" + System.currentTimeMillis());
        database.makePersistent(testProductGroup);
        tx.commit();
    }

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        String bindingName = "testDoubleBindInOneTx_" + System.currentTimeMillis();


        Article article = createArticle();
        Article foundArticle = null;


        Transaction tx = odmg.newTransaction();
        tx.begin();
        database.bind(article, bindingName);


        foundArticle = (Article) database.lookup(bindingName);
        assertNotNull(foundArticle);


        foundArticle = null;
        database.unbind(bindingName);
        try
        {
            foundArticle = (Article) database.lookup(bindingName);
            fail("Found unbound DList");
        }
        catch (ObjectNameNotFoundException ex)
        {
            // expected exception
            assertTrue(true);
        }


        database.bind(article, bindingName);
        foundArticle = (Article) database.lookup(bindingName);


        foundArticle = null;
        tx.commit();


        tx = odmg.newTransaction();
        tx.begin();
        foundArticle = (Article) database.lookup(bindingName);
        assertNotNull(foundArticle);
        database.unbind(bindingName);
        tx.commit();
    }

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    public void testUnBind() throws Exception
    {
        String name = "testUnBind_" + System.currentTimeMillis();


        Transaction tx = odmg.newTransaction();
        //bind object to name
        tx.begin();
        Article example = createArticle();
        database.makePersistent(example);
        tx.commit();


        // 1. perform binding
        tx.begin();
        try
        {
            database.bind(example, name);
            tx.commit();
        }
        catch (ObjectNameNotUniqueException ex)
        {
            tx.abort();
            fail(ex.getMessage());
        }


        // 2. perform unbind
        tx = odmg.newTransaction();
        tx.begin();
        try
        {
            database.unbind(name);
            tx.commit();
        }
        catch (ObjectNameNotFoundException ex)
        {
            tx.abort();
            fail("name " + name + "should be known");
        }


        // 3. check if name is really unknown now
        tx = odmg.newTransaction();
        tx.begin();
        try
        {
            Article value = (Article) database.lookup(name);
            assertNotNull("Should not find unbind name '" + name+"'", value);
            fail("name " + name + " should not be known after unbind");
        }
        catch (ObjectNameNotFoundException ex)
        {
            // OK, expected
            assertTrue(true);
        }
        tx.abort();
    }

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    }


    protected void setUp() throws Exception
    {
        super.setUp();
        Transaction tx = odmg.newTransaction();
        tx.begin();
        productGroup = new ProductGroup();
        productGroup.setName("DMapTest_" + System.currentTimeMillis() + "_");
        database.makePersistent(productGroup);
        tx.commit();
    }

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    {
        // create a unique name:
        final String name = "testReadAndStore_" + System.currentTimeMillis();


        // create test objects
        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
        OQLQuery q = odmg.newOQLQuery();
        q.create("select all from "+DObject.class.getName()+" where name=$1");
        q.bind(name);
        Collection ret = (Collection) q.execute();
        // 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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        // create a unique name:
        final String name = "testAdding_" + System.currentTimeMillis();


        // get DList and fill with objects
        DList list = odmg.newDList();
        Transaction tx = odmg.newTransaction();
        tx.begin();
        for (int i = 0; i < 5; i++)
        {
            DObject a = createObject(name);
            list.add(a);
        }
        // bind the new list
        database.bind(list, name);
        tx.commit();


        tx = odmg.newTransaction();
        tx.begin();
        Object obj = database.lookup(name);
        tx.commit();
        assertNotNull("binded DList not found", obj);


        // iterate list
        Iterator iter = list.iterator();
        while (iter.hasNext())
        {
            DObject a = (DObject) iter.next();
            assertNotNull(a);
        }
        assertEquals(5, list.size());


        tx = odmg.newTransaction();
        tx.begin();
        ((TransactionExt) odmg.currentTransaction()).getBroker().clearCache();
        DList lookedUp = (DList) database.lookup(name);
        tx.commit();
        assertNotNull("binded DList not found", lookedUp);


        //System.out.println("sequence of items in lookedup list:");
        iter = lookedUp.iterator();
        Iterator iter1 = list.iterator();

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    public void testRemoving() throws Exception
    {
        // create a unique name:
        String name = "testRemoving_" + System.currentTimeMillis();


        Transaction tx = odmg.newTransaction();
        tx.begin();
        DList list = odmg.newDList();
        // bind the list to the name:
        database.bind(list, name);


        for (int i = 0; i < 5; i++)
        {
            DObject a = createObject(name);
            list.add(a);
        }
        assertEquals(5, list.size());
        tx.commit();


        // delete two items
        tx = odmg.newTransaction();
        tx.begin();
        ((HasBroker) odmg.currentTransaction()).getBroker().clearCache();
        DList lookedUp = (DList) database.lookup(name);
        assertNotNull("database lookup does not find the named DList", lookedUp);
        assertEquals("Wrong number of list entries", 5, lookedUp.size());
        lookedUp.remove(2);
        lookedUp.remove(1);
        tx.commit();


        // check if deletion was successful
        tx = odmg.newTransaction();
        tx.begin();
        ((HasBroker) odmg.currentTransaction()).getBroker().clearCache();
        lookedUp = (DList) database.lookup(name);
        tx.commit();


        assertEquals(3, lookedUp.size());
    }

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    public void testAddingWithIndex() throws Exception
    {
        // create a unique name:
        String name = "testAddingWithIndex_" + System.currentTimeMillis();


        Transaction tx = odmg.newTransaction();
        tx.begin();
        DList list = odmg.newDList();
        database.bind(list, name);
        tx.commit();


        tx = odmg.newTransaction();
        tx.begin();
        for (int i = 0; i < 5; i++)
        {
            DObject a = createObject(name);
            list.add(a);
        }


        list.add(2, createObject(name+"_pos2"));
        list.add(0, createObject(name+"_pos0"));
        list.add(7, createObject(name+"_pos7"));
        tx.commit();


        tx.begin();
        ((TransactionImpl) tx).getBroker().clearCache();
        // System.out.println("list: " + list);
        // System.out.println("lookup list: " + db.lookup(name));
        tx.commit();


        //System.out.println("sequence of items in list:");
        Iterator iter = list.iterator();
        DObject a;
        while (iter.hasNext())
        {
            a = (DObject) iter.next();
            assertNotNull(a);
            //System.out.print(a.getArticleId() + ", ");
        }




        tx = odmg.newTransaction();
        tx.begin();
        ((TransactionImpl) tx).getBroker().clearCache();
        DList lookedUp = (DList) database.lookup(name);
        // System.out.println("lookup list: " + lookedUp);
        assertNotNull("database lookup does not find DList", lookedUp);
        assertEquals(8, lookedUp.size());
        iter = lookedUp.iterator();
        while (iter.hasNext())
        {
            a = (DObject) iter.next();
        }
        tx.commit();
    }

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    public void testDBag() throws Exception
    {
        String name = "testDBag_" + System.currentTimeMillis();


        Transaction tx = odmg.newTransaction();
        tx.begin();
        DBag bag1 = odmg.newDBag();
        DBag bag2 = odmg.newDBag();
        DObject a, b, c, d, e;
        a = createObject(name);
        b = createObject(name);
        c = createObject(name);
        d = createObject(name);
        e = createObject(name);
        bag1.add(a);
        bag1.add(b);
        bag1.add(c);
        bag2.add(b);
        bag2.add(c);
        bag2.add(d);
        bag2.add(e);
        DBag bag3 = bag1.difference(bag2);
        assertEquals("should contain only 1 element", 1, bag3.size());


        bag3 = bag1.intersection(bag2);
        assertEquals("should contain two elements", 2, bag3.size());


        tx.commit();
    }

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        newProduct.setStock(Integer.parseInt(in));


        // now perform persistence operations


        // 3. open transaction
        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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