spring EndpointExtension 源码
springboot EndpointExtension 代码
文件路径：/spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/annotation/EndpointExtension.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.actuate.endpoint.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;
import org.springframework.aot.hint.annotation.Reflective;
import org.springframework.boot.actuate.endpoint.EndpointFilter;
import org.springframework.boot.actuate.endpoint.Operation;
import org.springframework.core.annotation.AliasFor;
/**
* Annotation primarily used as a meta-annotation to indicate that an annotation provides
* extension support for an endpoint. Extensions allow additional technology specific
* {@link Operation operations} to be added to an existing endpoint. For example, a web
* extension may offer variations of a read operation to support filtering based on a
* query parameter.
* <p>
* Extension annotations must provide an {@link EndpointFilter} to restrict when the
* extension applies. The {@code endpoint} attribute is usually re-declared using
* {@link AliasFor @AliasFor}. For example: <pre class="code">
* @EndpointExtension(filter = WebEndpointFilter.class)
* public @interface EndpointWebExtension {
*
* @AliasFor(annotation = EndpointExtension.class, attribute = "endpoint")
* Class<?> endpoint();
*
* }
* </pre>
*
* @author Phillip Webb
* @since 2.0.0
*/
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Reflective
public @interface EndpointExtension {
/**
* The filter class used to determine when the extension applies.
* @return the filter class
*/
Class<? extends EndpointFilter<?>> filter();
/**
* The class of the endpoint to extend.
* @return the class endpoint to extend
*/
Class<?> endpoint() default Void.class;
}
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