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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.service.spi;

import org.hibernate.service.Service;

import org.jboss.logging.Logger;

/**
 * Models a binding for a particular service
 *
 * @author Steve Ebersole
 */
public final class ServiceBinding {
	private static final Logger log = Logger.getLogger( ServiceBinding.class );

	public static interface ServiceLifecycleOwner {
		public  R initiateService(ServiceInitiator serviceInitiator);

		public  void configureService(ServiceBinding binding);
		public  void injectDependencies(ServiceBinding binding);
		public  void startService(ServiceBinding binding);

		public  void stopService(ServiceBinding binding);
	}

	private final ServiceLifecycleOwner lifecycleOwner;
	private final Class serviceRole;
	private final ServiceInitiator serviceInitiator;
	private volatile R service;

	public ServiceBinding(ServiceLifecycleOwner lifecycleOwner, Class serviceRole, R service) {
		this.lifecycleOwner = lifecycleOwner;
		this.serviceRole = serviceRole;
		this.serviceInitiator = null;
		this.service = service;
	}

	public ServiceBinding(ServiceLifecycleOwner lifecycleOwner, ServiceInitiator serviceInitiator) {
		this.lifecycleOwner = lifecycleOwner;
		this.serviceRole = serviceInitiator.getServiceInitiated();
		this.serviceInitiator = serviceInitiator;
	}

	public ServiceLifecycleOwner getLifecycleOwner() {
		return lifecycleOwner;
	}

	public Class getServiceRole() {
		return serviceRole;
	}

	public ServiceInitiator getServiceInitiator() {
		return serviceInitiator;
	}

	public R getService() {
		return service;
	}

	public void setService(R service) {
		if ( this.service != null ) {
			if ( log.isDebugEnabled() ) {
				log.debug( "Overriding existing service binding [" + serviceRole.getName() + "]" );
			}
		}
		this.service = service;
	}
}