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The core O/RM functionality as provided by Hibernate

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/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
 * See the lgpl.txt file in the root directory or .
 */
package org.hibernate.integrator.spi;

import org.hibernate.boot.Metadata;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.service.spi.SessionFactoryServiceRegistry;

/**
 * Contract for stuff that integrates with Hibernate.
 * 
 * IMPL NOTE: called during session factory initialization (constructor), so not all parts of the passed session factory
 * will be available.
 *
 * @author Steve Ebersole
 * @since 4.0
 */
public interface Integrator {

	/**
	 * Perform integration.
	 *
	 * @param metadata The "compiled" representation of the mapping information
	 * @param sessionFactory The session factory being created
	 * @param serviceRegistry The session factory's service registry
	 */
	public void integrate(
			Metadata metadata,
			SessionFactoryImplementor sessionFactory,
			SessionFactoryServiceRegistry serviceRegistry);

	/**
	 * Tongue-in-cheek name for a shutdown callback.
	 *
	 * @param sessionFactory The session factory being closed.
	 * @param serviceRegistry That session factory's service registry
	 */
	public void disintegrate(SessionFactoryImplementor sessionFactory, SessionFactoryServiceRegistry serviceRegistry);

}