/* This file is part of the db4o object database http://www.db4o.com
Copyright (C) 2004 - 2011 Versant Corporation http://www.versant.com
db4o is free software; you can redistribute it and/or modify it under
the terms of version 3 of the GNU General Public License as published
by the Free Software Foundation.
db4o is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License along
with this program. If not, see http://www.gnu.org/licenses/. */
package com.db4o.config;
/**
* Interface to configure the IdSystem.
*/
public interface IdSystemConfiguration {
/**
* configures db4o to store IDs as pointers.
*/
public void usePointerBasedSystem();
/**
* configures db4o to use a stack of two BTreeIdSystems on
* top of an InMemoryIdSystem. This setup is scalable for
* large numbers of IDs. It is the default configuration
* when new databases are created.
*/
public void useStackedBTreeSystem();
/**
* configures db4o to use a single BTreeIdSystem on
* top of an InMemoryIdSystem. This setup is suitable for
* smaller databases with a small number of IDs.
* For larger numbers of IDs call {@link #useStackedBTreeSystem()}.
*/
public void useSingleBTreeSystem();
/**
* configures db4o to use an in-memory ID system.
* All IDs get written to the database file on every commit.
*/
public void useInMemorySystem();
/**
* configures db4o to use a custom ID system.
* Pass an {@link IdSystemFactory} that creates the IdSystem.
* Note that this factory has to be configured every time you
* open a database that you configured to use a custom IdSystem.
*/
public void useCustomSystem(IdSystemFactory factory);
}