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/*
 * 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.
 *
 * 

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. * *

May be used on any class directly or indirectly annotated with * {@link org.springframework.stereotype.Component} or on methods annotated * with {@link Bean}. * *

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 } 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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