Examples of org.odmg.Transaction.begin()

org.odmg.Transaction.begin()
Start a transaction. Calling begin multiple times on the same transaction object, without an intervening call to commit or abort, causes the exception TransactionInProgressException to be thrown on the second and subsequent calls. Operations executed before a transaction has been opened, or before reopening after a transaction is aborted or committed, have undefined results; these may throw a TransactionNotInProgressException exception.

     */
    public void testEmpty() throws Exception
    {
        // get new tx instance each time
        Transaction tx = odmg.newTransaction();
        tx.begin();
        tx.abort();


        tx = odmg.newTransaction();
        tx.begin();
        tx.checkpoint();

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        Transaction tx = odmg.newTransaction();
        tx.begin();
        tx.abort();


        tx = odmg.newTransaction();
        tx.begin();
        tx.checkpoint();
        tx.checkpoint();
        tx.abort();


        tx = odmg.newTransaction();

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        tx.checkpoint();
        tx.checkpoint();
        tx.abort();


        tx = odmg.newTransaction();
        tx.begin();
        tx.checkpoint();
        tx.checkpoint();
        tx.commit();


        tx = odmg.newTransaction();

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        tx.checkpoint();
        tx.checkpoint();
        tx.commit();


        tx = odmg.newTransaction();
        tx.begin();
        tx.commit();


        // with same tx instance
        tx = odmg.newTransaction();
        tx.begin();

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        tx.begin();
        tx.commit();


        // with same tx instance
        tx = odmg.newTransaction();
        tx.begin();
        tx.abort();


        tx.begin();
        tx.checkpoint();
        tx.checkpoint();

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        // with same tx instance
        tx = odmg.newTransaction();
        tx.begin();
        tx.abort();


        tx.begin();
        tx.checkpoint();
        tx.checkpoint();
        tx.abort();


        tx.begin();

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        tx.begin();
        tx.checkpoint();
        tx.checkpoint();
        tx.abort();


        tx.begin();
        tx.checkpoint();
        tx.checkpoint();
        tx.commit();


        tx.begin();

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        tx.begin();
        tx.checkpoint();
        tx.checkpoint();
        tx.commit();


        tx.begin();
        tx.commit();
    }


    public void testDoubleAbortTxCall() throws Exception
    {

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    public void testDoubleAbortTxCall() throws Exception
    {
        try
        {
            Transaction tx = odmg.newTransaction();
            tx.begin();
            tx.abort();
            tx.abort();
        }
        catch(Exception e)
        {

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    {
        Transaction tx = odmg.newTransaction();
        String name = "testCheckCacheAfterRollback_"+System.currentTimeMillis();
        try
        {
            tx.begin();


            RollbackObjectOne ro = new RollbackObjectOne();
            ro.setName(name);
            tx.lock(ro, Transaction.WRITE);
            // this should fail

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