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Hibernate's entity version (audit/history) support

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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.envers.internal.synchronization;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.action.spi.AfterTransactionCompletionProcess;
import org.hibernate.engine.spi.SharedSessionContractImplementor;
import org.hibernate.event.spi.EventSource;

/**
 * Class responsible for evicting audit data entries that have been stored in the session level cache.
 * This operation increases Envers performance in case of massive entity updates without clearing persistence context.
 *
 * @author Lukasz Antoniak (lukasz dot antoniak at gmail dot com)
 */
public class SessionCacheCleaner {
	/**
	 * Schedules audit data removal from session level cache after transaction completion. The operation is performed
	 * regardless of commit success.
	 *
	 * @param session Active Hibernate session.
	 * @param data Audit data that shall be evicted (e.g. revision data or entity snapshot)
	 */
	public void scheduleAuditDataRemoval(final Session session, final Object data) {
		( (EventSource) session ).getActionQueue().registerProcess(
				new AfterTransactionCompletionProcess() {
					public void doAfterTransactionCompletion(boolean success, SharedSessionContractImplementor sessionImplementor) {
						if ( !sessionImplementor.isClosed() ) {
							try {
								( (Session) sessionImplementor ).evict( data );
							}
							catch ( HibernateException ignore ) {
							}
						}
					}
				}
		);
	}
}