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Architectural concepts in Java

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/*
 * Copyright 2021 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.jmolecules.ddd.annotation;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * Declares a field (or a getter) of a class to constitute the identity of the corresponding class. Primarily used in
 * {@link AggregateRoot} and {@link Entity} types.
 *
 * @author Oliver Drotbohm
 * @author Stephan Pirnbaum
 * @author Henning Schwentner
 * @since 1.3
 * @see Domain-Driven Design
 *      Reference (Evans) - Entities
 */
@Retention(RetentionPolicy.RUNTIME)
@Target({ ElementType.FIELD, ElementType.METHOD, ElementType.ANNOTATION_TYPE })
@Documented
public @interface Identity {}