Examples of org.helidb.txn.Transaction

org.helidb.txn.Transaction
ikipedia.org/wiki/ACID">this Wikipedia article. At the end of the logical operation, it is either {@link #commit()}:ed, i.e. persisted to the database storage, or {@link #rollback()}:ed, i.e. discarded.
A transaction always involves just one execution thread. Several different threads may have their own transactions, and the transactions' ACID:ity properties guarantee that they will never see data in an intermediate state. This is accomplished by the thread locking implemented in the involved databases.
HeliDB has both read/write and read only transactions. It is up to the {@link org.helidb.Database} implementation used if they are treateddifferently. For instance, a {@code Database} could allow several concurrentread only transactions, but only one simultaneous transaction if that transaction is read/write.
A new transaction is started by any of the static {@link #startTransaction(boolean)} or {@link #getOrStartTransaction(boolean)}methods. If the thread already is involved in a transaction and wants to get that transaction's {@code Transaction} object, it can call any of the staticgetter methods.
Implementation note:
A database joins a {@code Transaction} via its{@link TransactionCollaborator}. It uses one collaborator object per transaction it is involved in. The collaborator keeps track of the state for the database associated with just that transaction. @author Karl Gustafsson @since 1.0 @see TransactionCollaborator @see TransactionalDatabase

  }


  @Test
  public void testClearTransactionAtRollback()
  {
    Transaction txn = Transaction.startTransaction(false);
    assertSame(txn, Transaction.getCurrentTransaction());
    txn.rollback();
    assertNull(Transaction.getCurrentTransactionOrNull());
  }

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  }


  @Override
  protected void tearDownDatabase(Database<?, ?> db)
  {
    Transaction txn = Transaction.getCurrentTransactionOrNull();
    // The transaction may already be rolled back if we're working with
    // several databases.
    if (txn != null)
    {
      txn.rollback();
    }


    db.close();
    Directory dbDir = m_dbDirs.remove(Integer.valueOf(System.identityHashCode(db)));
    if (dbDir != null)

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   * Load some data into the database.
   */
  protected void populateDb(Database<String, String> db)
  {
    boolean successful = false;
    Transaction txn = Transaction.startTransaction(false);
    try
    {
      db.fasterInsert("key1", "value1");
      db.fasterInsert("key10", "value10");
      assertEquals("value1", db.get("key1"));
      assertEquals("value10", db.get("key10"));
      txn.commit();
      successful = true;
    }
    finally
    {
      if (!successful)
      {
        txn.rollback();
      }
    }
    assertNull(Transaction.getCurrentTransactionOrNull());
  }

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    Database<String, String> db = createDatabaseWoTxn();
    try
    {
      populateDb(db);


      Transaction txn = Transaction.startTransaction(true);
      try
      {
        assertEquals("value1", db.get("key1"));
        assertEquals("value10", db.get("key10"));
      }
      finally
      {
        txn.rollback();
      }
    }
    finally
    {
      tearDownDatabase(db);

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  public void testRollback()
  {
    Database<String, String> db = createDatabaseWoTxn();
    try
    {
      Transaction txn = Transaction.startTransaction(false);
      try
      {
        db.fasterInsert("key1", "value1");
        db.fasterInsert("key10", "value10");
        assertEquals("value1", db.get("key1"));
        assertEquals("value10", db.get("key10"));
      }
      finally
      {
        txn.rollback();
      }


      txn = Transaction.startTransaction(true);
      try
      {
        assertNull(db.get("key1"));
        assertNull(db.get("key10"));
      }
      finally
      {
        txn.rollback();
      }
    }
    finally
    {
      tearDownDatabase(db);

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      catch (NoTransactionException e)
      {
        // ok
      }


      Transaction txn = Transaction.startTransaction(true);
      try
      {
        assertEquals("value1", db.get("key1"));
      }
      finally
      {
        txn.rollback();
      }
    }
    finally
    {
      tearDownDatabase(db);

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    try
    {
      populateDb(db);


      assertNull(Transaction.getCurrentTransactionOrNull());
      Transaction txn = Transaction.startTransaction(true);
      try
      {
        try
        {
          db.fasterInsert("key11", "value11");
          fail();
        }
        catch (ReadOnlyTransactionException e)
        {
          // ok
        }


        assertNull(db.get("key11"));
      }
      finally
      {
        txn.commit();
      }


      txn = Transaction.startTransaction(true);
      try
      {
        assertNull(db.get("key11"));
      }
      finally
      {
        txn.rollback();
      }
    }
    finally
    {
      tearDownDatabase(db);

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    Database<String, String> db = createDatabaseWoTxn();
    try
    {
      populateDb(db);
      boolean committed = false;
      Transaction txn = Transaction.startTransaction(false);
      try
      {
        db.fasterInsert("key11", "value11");
        tearDownDatabase(db);
        destroyed = true;
        committed = true;
        try
        {
          txn.commit();
        }
        catch (IllegalStateException e)
        {
          // ok
        }
      }
      finally
      {
        if (!committed)
        {
          txn.rollback();
        }
      }
    }
    finally
    {

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    Database<String, String> db = createDatabaseWoTxn();
    try
    {
      populateDb(db);
      boolean committed = false;
      Transaction txn = Transaction.startTransaction(false);
      try
      {
        db.fasterInsert("key11", "value11");
        tearDownDatabase(db);
        destroyed = true;
        committed = true;
        try
        {
          txn.rollback();
        }
        catch (IllegalStateException e)
        {
          // ok
        }
      }
      finally
      {
        if (!committed)
        {
          txn.rollback();
        }
      }
    }
    finally
    {

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  public void testInsertCommit()
  {
    Database<String, String> db = createDatabaseWoTxn();
    try
    {
      Transaction txn = Transaction.startTransaction(false);
      try
      {
        db.insert("key 1", "value 1");
        db.insert("key 2", "value 2");
        txn.commit();


        txn = Transaction.startTransaction(true);
        assertEquals(2, db.size());
        assertEquals("value 2", db.get("key 2"));
        assertEquals("value 1", db.get("key 1"));
      }
      finally
      {
        txn.rollback();
      }
    }
    finally
    {
      tearDownDatabase(db);

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