spring Payload 源码
spring Payload 代码
文件路径：/spring-messaging/src/main/java/org/springframework/messaging/handler/annotation/Payload.java
/*
* Copyright 2002-2015 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;
import org.springframework.core.annotation.AliasFor;
import org.springframework.messaging.converter.MessageConverter;
/**
* Annotation that binds a method parameter to the payload of a message. Can also
* be used to associate a payload to a method invocation. The payload may be passed
* through a {@link MessageConverter} to convert it from serialized form with a
* specific MIME type to an Object matching the target method parameter.
*
* @author Rossen Stoyanchev
* @author Sam Brannen
* @since 4.0
*/
@Target({ElementType.PARAMETER, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface Payload {
/**
* Alias for {@link #expression}.
*/
@AliasFor("expression")
String value() default "";
/**
* A SpEL expression to be evaluated against the payload object as the root context.
* <p>This attribute may or may not be supported depending on whether the message being
* handled contains a non-primitive Object as its payload or is in serialized form and
* requires message conversion.
* <p>When processing STOMP over WebSocket messages this attribute is not supported.
* @since 4.2
*/
@AliasFor("value")
String expression() default "";
/**
* Whether payload content is required.
* <p>Default is {@code true}, leading to an exception if there is no payload. Switch
* to {@code false} to have {@code null} passed when there is no payload.
*/
boolean required() default true;
}
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