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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 static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

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

import org.hibernate.generator.internal.CurrentTimestampGeneration;

/**
 * Specifies that the annotated field of property is a generated update timestamp.
 * The timestamp is regenerated every time an entity instance is updated in the database.
 * 
 * By default, the timestamp is generated {@linkplain java.time.Clock#instant() in memory},
 * but this may be changed by explicitly specifying the {@link #source}.
 * Otherwise, this annotation is a synonym for
 * {@link CurrentTimestamp @CurrentTimestamp(source=VM)}.
 *
 * @see CurrentTimestamp
 *
 * @author Gunnar Morling
 */
@ValueGenerationType(generatedBy = CurrentTimestampGeneration.class)
@Retention(RUNTIME)
@Target({ FIELD, METHOD })
public @interface UpdateTimestamp {
	/**
	 * Specifies how the timestamp is generated. By default, it is generated
	 * in memory, which saves a round trip to the database.
	 */
	SourceType source() default SourceType.VM;
}