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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) 2014 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
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Contributors:
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package org.datanucleus.enhancement;

/**
 * Reference for an ExecutionContext, for use in the enhancement contract.
 * This is used because if we just used ExecutionContext it would drag in many other classes etc, so reducing exposure.
 * TODO The signature of findObject could return Persistable. Would need to update enhancer if we do that.
 */
public interface ExecutionContextReference
{
    /**
     * Accessor for the owner of the ExecutionContext. This will be a PersistenceManager (JDO) or EntityManager (JPA/Jakarta).
     * @return The owner
     */
    Object getOwner();

    /**
     * Accessor for an object given the object id.
     * @param id The id of the object
     * @param validate Whether to validate the id
     * @return The object
     */
    Object findObject(Object id, boolean validate);
}