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DataNucleus Core provides the primary components of a heterogenous Java persistence solution. It supports persistence API's being layered on top of the core functionality.

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/**********************************************************************
Copyright (c) 2011 Andy Jefferson and others. All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

Contributors:
   ...
**********************************************************************/
package org.datanucleus.store.federation;

import org.datanucleus.ExecutionContext;
import org.datanucleus.state.ObjectProvider;
import org.datanucleus.store.PersistenceBatchType;
import org.datanucleus.store.StoreManager;
import org.datanucleus.store.StorePersistenceHandler;

/**
 * Persistence handler for federated datastores.
 * Distributes the inserts/updates/deletes/fetches to the appropriate datastore.
 */
public class FederatedPersistenceHandler implements StorePersistenceHandler
{
    /** Manager for the store. */
    FederatedStoreManager storeMgr;

    /**
     * Constructor.
     * @param storeMgr StoreManager
     */
    public FederatedPersistenceHandler(StoreManager storeMgr)
    {
        this.storeMgr = (FederatedStoreManager)storeMgr;
    }

    /* (non-Javadoc)
     * @see org.datanucleus.store.StorePersistenceHandler#close()
     */
    public void close()
    {
    }

    /* (non-Javadoc)
     * @see org.datanucleus.store.StorePersistenceHandler#useReferentialIntegrity()
     */
    public boolean useReferentialIntegrity()
    {
        return false;
    }

    /* (non-Javadoc)
     * @see org.datanucleus.store.StorePersistenceHandler#insertObjects(org.datanucleus.store.ObjectProvider[])
     */
    public void insertObjects(ObjectProvider... ops)
    {
        // TODO Support splitting the array into the respective datastore
        for (int i=0;i