org.datanucleus.store.rdbms.valuegenerator
Class AbstractRDBMSGenerator

java.lang.Object
  org.datanucleus.store.valuegenerator.AbstractGenerator
      org.datanucleus.store.valuegenerator.AbstractDatastoreGenerator
          org.datanucleus.store.rdbms.valuegenerator.AbstractRDBMSGenerator

All Implemented Interfaces:

org.datanucleus.store.valuegenerator.ValueGenerator

Direct Known Subclasses:

DatastoreUUIDHexGenerator, MaxGenerator, SequenceGenerator, TableGenerator

public abstract class AbstractRDBMSGenerator
extends org.datanucleus.store.valuegenerator.AbstractDatastoreGenerator

Abstract representation of a ValueGenerator for RDBMS datastores. Builds on the base AbstractValueGenerator, and providing datastore connection and StoreManager information.

Field Summary

protected org.datanucleus.store.connection.ManagedConnection	connection Connection to the datastore.
protected static org.datanucleus.util.Localiser	LOCALISER_RDBMS Localiser for messages specific to RDBMS generators.

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

AbstractRDBMSGenerator(String name, Properties props)
Constructor.

Method Summary

protected org.datanucleus.store.valuegenerator.ValueGenerationBlock	obtainGenerationBlock(int number) Get a new PoidBlock with the specified number of ids.
boolean	requiresConnection() Method to reply if the generator requires a connection.

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, reserveBlock

Methods inherited from class java.lang.Object

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

Field Detail

LOCALISER_RDBMS

protected static final org.datanucleus.util.Localiser LOCALISER_RDBMS

Localiser for messages specific to RDBMS generators.

connection

protected org.datanucleus.store.connection.ManagedConnection connection

Connection to the datastore.

Constructor Detail

AbstractRDBMSGenerator

public AbstractRDBMSGenerator(String name,
                              Properties props)

Constructor.

Parameters:

name - Symbolic name for the generator

props - Properties controlling the behaviour of the generator

Method Detail

requiresConnection

public boolean requiresConnection()

Method to reply if the generator requires a connection.

Returns:

Whether a connection is required.

obtainGenerationBlock

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

Get a new PoidBlock with the specified number of ids.

Overrides:

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

Parameters:

number - The number of additional ids required

Returns:

the PoidBlock