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Hibernate's core ORM functionality

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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.annotations;

import java.lang.annotation.Retention;
import java.lang.annotation.Target;

import static java.lang.annotation.ElementType.TYPE;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

/**
 * Used to specify that the natural id values associated with the annotated entity should be cached in Hibernate's
 * shared (L2) cache.  Can optionally name a custom cache region.
 *
 * @author Eric Dalquist
 * @author Steve Ebersole
 *
 * @see NaturalId
 */
@Target(TYPE)
@Retention(RUNTIME)
public @interface NaturalIdCache {
	/**
	 * The cache region name.  {@code null} or empty-string (the default) are interpreted as
	 * {@code {entity-name}##NaturalId}
	 */
	String region() default "";
}