spring ConditionalOnExpression 源码
springboot ConditionalOnExpression 代码
文件路径：/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/condition/ConditionalOnExpression.java
/*
* Copyright 2012-2022 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.boot.autoconfigure.condition;
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.context.annotation.Conditional;
/**
* Configuration annotation for a conditional element that depends on the value of a SpEL
* expression.
* <p>
* Referencing a bean in the expression will cause that bean to be initialized very early
* in context refresh processing. As a result, the bean won't be eligible for
* post-processing (such as configuration properties binding) and its state may be
* incomplete.
*
* @author Dave Syer
* @since 1.0.0
*/
@Retention(RetentionPolicy.RUNTIME)
@Target({ ElementType.TYPE, ElementType.METHOD })
@Documented
@Conditional(OnExpressionCondition.class)
public @interface ConditionalOnExpression {
/**
* The SpEL expression to evaluate. Expression should return {@code true} if the
* condition passes or {@code false} if it fails.
* @return the SpEL expression
*/
String value() default "true";
}
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- 本文标签： Java Spring Spring Boot
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