/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 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.event.service.spi;
/**
* Defines listener duplication checking strategy, both in terms of when a duplication is detected (see
* {@link #areMatch}) as well as how to handle a duplication (see {@link #getAction}).
*
* @author Steve Ebersole
*/
public interface DuplicationStrategy {
/**
* The enumerated list of actions available on duplication match
*/
public static enum Action {
ERROR,
KEEP_ORIGINAL,
REPLACE_ORIGINAL
}
/**
* Are the two listener instances considered a duplication?
*
* @param listener The listener we are currently trying to register
* @param original An already registered listener
*
* @return {@literal true} if the two instances are considered a duplication; {@literal false} otherwise
*/
public boolean areMatch(Object listener, Object original);
/**
* How should a duplication be handled?
*
* @return The strategy for handling duplication
*/
public Action getAction();
}