/**
* Copyright (c) 2002-2011 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.kernel.impl.persistence;
/**
* The IdGenerator is responsible for generating unique ids for entities in the
* kernel. The IdGenerator is configured via the {@link IdGeneratorModule}.
* <P>
* The IdGenerator must be loaded after its designated
* {@link IdGeneratorModule#setPersistenceSource persistence source} during
* startup.
* <P>
*/
public class IdGenerator implements EntityIdGenerator
{
// the persistence source used to store the HIGH keys
private PersistenceSource persistenceSource = null;
/**
* Returns the next unique ID for the entity type represented by
* <CODE>clazz</CODE>.
* @return the next ID for <CODE>clazz</CODE>'s entity type
*/
public int nextId( Class<?> clazz )
{
return getPersistenceSource().nextId( clazz );
}
public long getHighestPossibleIdInUse( Class<?> clazz )
{
return getPersistenceSource().getHighestPossibleIdInUse( clazz );
}
public long getNumberOfIdsInUse( Class<?> clazz )
{
return getPersistenceSource().getNumberOfIdsInUse( clazz );
}
/**
* Configures the IdGenerator. <B>WARNING</B>: This method should only be
* invoked once from {@link IdGeneratorModule#start}.
* @param source
* the persistence source used for id generation
*/
public void configure( PersistenceSource source )
{
// Save connectivity
this.persistenceSource = source;
}
// Accesor for persistence source
private PersistenceSource getPersistenceSource()
{
return this.persistenceSource;
}
}