/*
* 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 <http://www.gnu.org/licenses/lgpl-2.1.html>.
*/
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();
}