org.hibernate.envers.internal.synchronization.AuditProcessManager Maven / Gradle / Ivy

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/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2013, Red Hat Inc. or third-party contributors as
 * indicated by the @author tags or express copyright attribution
 * statements applied by the authors.  All third-party contributions are
 * distributed under license by Red Hat Inc.
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU
 * Lesser General Public License, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 */
package org.hibernate.envers.internal.synchronization;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import org.hibernate.Transaction;
import org.hibernate.action.spi.AfterTransactionCompletionProcess;
import org.hibernate.action.spi.BeforeTransactionCompletionProcess;
import org.hibernate.engine.spi.SessionImplementor;
import org.hibernate.envers.internal.revisioninfo.RevisionInfoGenerator;
import org.hibernate.event.spi.EventSource;

/**
 * @author Adam Warski (adam at warski dot org)
 */
public class AuditProcessManager {
	private final Map auditProcesses;
	private final RevisionInfoGenerator revisionInfoGenerator;

	public AuditProcessManager(RevisionInfoGenerator revisionInfoGenerator) {
		auditProcesses = new ConcurrentHashMap();

		this.revisionInfoGenerator = revisionInfoGenerator;
	}

	public AuditProcess get(EventSource session) {
		final Transaction transaction = session.getTransaction();

		AuditProcess auditProcess = auditProcesses.get( transaction );
		if ( auditProcess == null ) {
			// No worries about registering a transaction twice - a transaction is single thread
			auditProcess = new AuditProcess( revisionInfoGenerator, session );
			auditProcesses.put( transaction, auditProcess );

			session.getActionQueue().registerProcess(
					new BeforeTransactionCompletionProcess() {
						public void doBeforeTransactionCompletion(SessionImplementor session) {
							final AuditProcess process = auditProcesses.get( transaction );
							if ( process != null ) {
								process.doBeforeTransactionCompletion( session );
							}
						}
					}
			);

			session.getActionQueue().registerProcess(
					new AfterTransactionCompletionProcess() {
						public void doAfterTransactionCompletion(boolean success, SessionImplementor session) {
							auditProcesses.remove( transaction );
						}
					}
			);
		}

		return auditProcess;
	}
}