spring DestinationVariable 源码
spring DestinationVariable 代码
文件路径：/spring-messaging/src/main/java/org/springframework/messaging/handler/annotation/DestinationVariable.java
/*
* Copyright 2002-2019 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.messaging.handler.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;
/**
* Annotation that indicates a method parameter should be bound to a template variable
* in a destination template string. Supported on message handling methods such as
* {@link MessageMapping @MessageMapping}.
*
* <p>A {@code @DestinationVariable} template variable is always required.
*
* @author Brian Clozel
* @author Rossen Stoyanchev
* @since 4.0
* @see org.springframework.messaging.handler.annotation.MessageMapping
* @see org.springframework.messaging.simp.annotation.support.SimpAnnotationMethodMessageHandler
*/
@Target(ElementType.PARAMETER)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface DestinationVariable {
/**
* The name of the destination template variable to bind to.
*/
String value() default "";
}
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