spring Repository 源码
spring Repository 代码
文件路径：/spring-context/src/main/java/org/springframework/stereotype/Repository.java
/*
* Copyright 2002-2022 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
*
* https://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.springframework.stereotype;
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;
import org.springframework.core.annotation.AliasFor;
/**
* Indicates that an annotated class is a "Repository", originally defined by
* Domain-Driven Design (Evans, 2003) as "a mechanism for encapsulating storage,
* retrieval, and search behavior which emulates a collection of objects".
*
* <p>Teams implementing traditional Jakarta EE patterns such as "Data Access Object"
* may also apply this stereotype to DAO classes, though care should be taken to
* understand the distinction between Data Access Object and DDD-style repositories
* before doing so. This annotation is a general-purpose stereotype and individual teams
* may narrow their semantics and use as appropriate.
*
* <p>A class thus annotated is eligible for Spring
* {@link org.springframework.dao.DataAccessException DataAccessException} translation
* when used in conjunction with a {@link
* org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor
* PersistenceExceptionTranslationPostProcessor}. The annotated class is also clarified as
* to its role in the overall application architecture for the purpose of tooling,
* aspects, etc.
*
* <p>As of Spring 2.5, this annotation also serves as a specialization of
* {@link Component @Component}, allowing for implementation classes to be autodetected
* through classpath scanning.
*
* @author Rod Johnson
* @author Juergen Hoeller
* @since 2.0
* @see Component
* @see Service
* @see org.springframework.dao.DataAccessException
* @see org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor
*/
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Component
public @interface Repository {
/**
* The value may indicate a suggestion for a logical component name,
* to be turned into a Spring bean in case of an autodetected component.
* @return the suggested component name, if any (or empty String otherwise)
*/
@AliasFor(annotation = Component.class)
String value() default "";
}
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