org.datanucleus.store.db4o.valuegenerator
Class DB4OIncrementGenerator

java.lang.Object
  org.datanucleus.store.valuegenerator.AbstractGenerator
      org.datanucleus.store.valuegenerator.AbstractDatastoreGenerator
          org.datanucleus.store.db4o.valuegenerator.DB4OIncrementGenerator

All Implemented Interfaces:

org.datanucleus.store.valuegenerator.ValueGenerator

public class DB4OIncrementGenerator
extends org.datanucleus.store.valuegenerator.AbstractDatastoreGenerator

Value generator for DB4O that provides increment/sequence like generation. Utilises the persistence of objects of NucleusSequence. Each objects stores the sequence class/field name and the current value of that sequence.

Field Summary

protected static org.datanucleus.util.Localiser

LOCALISER_DB4O Localiser for messages.

Fields inherited from class org.datanucleus.store.valuegenerator.AbstractDatastoreGenerator

connectionProvider, storeMgr

Fields inherited from class org.datanucleus.store.valuegenerator.AbstractGenerator

allocationSize, block, initialValue, LOCALISER, name, properties, repositoryExists

Constructor Summary

DB4OIncrementGenerator(java.lang.String name, java.util.Properties props)
Constructor.

Method Summary

protected org.datanucleus.store.valuegenerator.ValueGenerationBlock	obtainGenerationBlock(int number) Get a new block with the specified number of values.
protected org.datanucleus.store.valuegenerator.ValueGenerationBlock	reserveBlock(long size) Method to reserve a block of "size" identities.

Methods inherited from class org.datanucleus.store.valuegenerator.AbstractDatastoreGenerator

setConnectionProvider, setStoreManager

Methods inherited from class org.datanucleus.store.valuegenerator.AbstractGenerator

allocate, createRepository, current, currentValue, getName, getStorageClass, next, nextValue, obtainGenerationBlock, repositoryExists, requiresRepository, reserveBlock

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

LOCALISER_DB4O

protected static final org.datanucleus.util.Localiser LOCALISER_DB4O

Localiser for messages.

Constructor Detail

DB4OIncrementGenerator

public DB4OIncrementGenerator(java.lang.String name,
                              java.util.Properties props)

Constructor.

Parameters:

name - Symbolic name for this generator

props - Properties defining the behaviour of this generator

Method Detail

obtainGenerationBlock

protected org.datanucleus.store.valuegenerator.ValueGenerationBlock obtainGenerationBlock(int number)

Get a new block with the specified number of values.

Overrides:

obtainGenerationBlock in class org.datanucleus.store.valuegenerator.AbstractGenerator

Parameters:

number - The number of additional values required

Returns:

the block

reserveBlock

protected org.datanucleus.store.valuegenerator.ValueGenerationBlock reserveBlock(long size)

Method to reserve a block of "size" identities.

Specified by:

reserveBlock in class org.datanucleus.store.valuegenerator.AbstractGenerator

Parameters:

size - Block size

Returns:

The reserved block