spring DependsOn 源码
spring DependsOn 代码
文件路径：/spring-context/src/main/java/org/springframework/context/annotation/DependsOn.java
/*
* Copyright 2002-2018 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.context.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;
/**
* Beans on which the current bean depends. Any beans specified are guaranteed to be
* created by the container before this bean. Used infrequently in cases where a bean
* does not explicitly depend on another through properties or constructor arguments,
* but rather depends on the side effects of another bean's initialization.
*
* <p>A depends-on declaration can specify both an initialization-time dependency and,
* in the case of singleton beans only, a corresponding destruction-time dependency.
* Dependent beans that define a depends-on relationship with a given bean are destroyed
* first, prior to the given bean itself being destroyed. Thus, a depends-on declaration
* can also control shutdown order.
*
* <p>May be used on any class directly or indirectly annotated with
* {@link org.springframework.stereotype.Component} or on methods annotated
* with {@link Bean}.
*
* <p>Using {@link DependsOn} at the class level has no effect unless component-scanning
* is being used. If a {@link DependsOn}-annotated class is declared via XML,
* {@link DependsOn} annotation metadata is ignored, and
* {@code <bean depends-on="..."/>} is respected instead.
*
* @author Juergen Hoeller
* @since 3.0
*/
@Target({ElementType.TYPE, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface DependsOn {
String[] value() default {};
}
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