spring SendToUser 源码
spring SendToUser 代码
文件路径：/spring-messaging/src/main/java/org/springframework/messaging/simp/annotation/SendToUser.java
/*
* 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.messaging.simp.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;
/**
* Indicates the return value of a message-handling method should be sent as a
* {@link org.springframework.messaging.Message} to the specified destination(s)
* further prepended with <code>"/user/{username}"</code> where the user name
* is extracted from the headers of the input message being handled.
*
* <p>Both {@code @SendTo} and {@code @SendToUser} may be used on the same method
* in which case a message is sent to the destinations of both annotations.
*
* <p>This annotation may be placed class-level in which case it is inherited
* by methods of the class. At the same time, method-level {@code @SendTo} or
* {@code @SendToUser} annotations override any such at the class level.
* @author Rossen Stoyanchev
* @author Sam Brannen
* @since 4.0
* @see org.springframework.messaging.simp.annotation.support.SendToMethodReturnValueHandler
* @see org.springframework.messaging.simp.user.UserDestinationMessageHandler
* @see org.springframework.messaging.simp.SimpMessageHeaderAccessor#getUser()
*/
@Target({ElementType.TYPE, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface SendToUser {
/**
* Alias for {@link #destinations}.
* @see #destinations
*/
@AliasFor("destinations")
String[] value() default {};
/**
* One or more destinations to send a message to.
* <p>If left unspecified, a default destination is selected based on the
* destination of the input message being handled.
* @since 4.2
* @see #value
* @see org.springframework.messaging.simp.annotation.support.SendToMethodReturnValueHandler
*/
@AliasFor("value")
String[] destinations() default {};
/**
* Whether messages should be sent to all sessions associated with the user
* or only to the session of the input message being handled.
* <p>By default, this is set to {@code true} in which case messages are
* broadcast to all sessions.
*/
boolean broadcast() default true;
}
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