IdSystemConfiguration SourceCode GPL - https://github.com/iboxdb/db4o-gpl

All Known Implementing Classes:

IdSystemConfigurationImpl
```
public interface IdSystemConfiguration
```
Interface to configure the IdSystem.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`useCustomSystem(IdSystemFactory factory)`	configures db4o to use a custom ID system.
`void`	`useInMemorySystem()`	configures db4o to use an in-memory ID system.
`void`	`usePointerBasedSystem()`	configures db4o to store IDs as pointers.
`void`	`useSingleBTreeSystem()`	configures db4o to use a single BTreeIdSystem on top of an InMemoryIdSystem.
`void`	`useStackedBTreeSystem()`	configures db4o to use a stack of two BTreeIdSystems on top of an InMemoryIdSystem.

- Method Detail
  - usePointerBasedSystem
```
void usePointerBasedSystem()
```
    configures db4o to store IDs as pointers.
  - useStackedBTreeSystem
```
void useStackedBTreeSystem()
```
    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.
  - useSingleBTreeSystem
```
void useSingleBTreeSystem()
```
    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 useStackedBTreeSystem().
  - useInMemorySystem
```
void useInMemorySystem()
```
    configures db4o to use an in-memory ID system. All IDs get written to the database file on every commit.
  - useCustomSystem
```
void useCustomSystem(IdSystemFactory factory)
```
    configures db4o to use a custom ID system. Pass an 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.