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Neo4j kernel is a lightweight, embedded Java database designed to store data structured as graphs rather than tables. For more information, see http://neo4j.org.

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/**
 * Copyright (c) 2002-2013 "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 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 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 .
 */
package org.neo4j.kernel.impl.persistence;

import org.neo4j.kernel.impl.transaction.xaframework.XaConnection;
import org.neo4j.kernel.impl.transaction.xaframework.XaDataSource;

/**
 * A data resource that Neo4j kernel uses to persist entities.
 * 
 * All persistence sources for the kernel should implement this interface.
 */
public interface PersistenceSource
{
    /**
     * Creates a resource connection to this persistence source.
     * @param connection the {@link XaConnection} to use.
     * @return a newly opened {@link NeoStoreTransaction} to this
     *         PersistenceSource
     */
    public NeoStoreTransaction createTransaction( XaConnection connection );

    /**
     * If the persistence source is responsible for id generation it must
     * implement this method.
     * 
     * @param clazz
     *            the data structure to get next free unique id for
     * @return the next free unique id for clazz
     */
    public long nextId( Class clazz );

    public long getHighestPossibleIdInUse( Class clazz );

    public long getNumberOfIdsInUse( Class clazz );
    
    public XaDataSource getXaDataSource();
}