Hibernate example source code file (DelayedPostInsertIdentifier.java)

This example Hibernate source code file (DelayedPostInsertIdentifier.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Hibernate tags/keywords

delayedpostinsertidentifier, delayedpostinsertidentifier, io, override, override, sequence, sequence, serializable, serializable, string

The Hibernate DelayedPostInsertIdentifier.java source code

/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2008-2011, 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.action.internal;

import java.io.Serializable;

/**
 * Acts as a stand-in for an entity identifier which is supposed to be
 * generated on insert (like an IDENTITY column) where the insert needed to
 * be delayed because we were outside a transaction when the persist
 * occurred (save currently still performs the insert).
 * <p/>
 * The stand-in is only used within the {@link org.hibernate.engine.spi.PersistenceContext}
 * in order to distinguish one instance from another; it is never injected into
 * the entity instance or returned to the client...
 *
 * @author Steve Ebersole
 */
public class DelayedPostInsertIdentifier implements Serializable {
	private static long SEQUENCE = 0;
	private final long sequence;

	public DelayedPostInsertIdentifier() {
		synchronized( DelayedPostInsertIdentifier.class ) {
			if ( SEQUENCE == Long.MAX_VALUE ) {
				SEQUENCE = 0;
			}
			this.sequence = SEQUENCE++;
		}
	}

	@Override
	public boolean equals(Object o) {
		if ( this == o ) {
			return true;
		}
		if ( o == null || getClass() != o.getClass() ) {
			return false;
		}
		final DelayedPostInsertIdentifier that = ( DelayedPostInsertIdentifier ) o;
		return sequence == that.sequence;
	}

	@Override
	public int hashCode() {
		return ( int ) ( sequence ^ ( sequence >>> 32 ) );
	}

	@Override
	public String toString() {
		return "<delayed:" + sequence + ">";

	}
}