spring UserDestinationResolver 源码
spring UserDestinationResolver 代码
文件路径：/spring-messaging/src/main/java/org/springframework/messaging/simp/user/UserDestinationResolver.java
/*
* Copyright 2002-2016 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.user;
import org.springframework.lang.Nullable;
import org.springframework.messaging.Message;
/**
* A strategy for resolving a "user" destination by translating it to one or more
* actual destinations one per active user session. When sending a message to a
* user destination, the destination must contain the user name so it may be
* extracted and used to look up the user sessions. When subscribing to a user
* destination, the destination does not have to contain the user's own name.
* We simply use the current session.
*
* <p>See implementation classes and the documentation for example destinations.
*
* @author Rossen Stoyanchev
* @since 4.0
*
* @see org.springframework.messaging.simp.user.DefaultUserDestinationResolver
* @see UserDestinationMessageHandler
*/
@FunctionalInterface
public interface UserDestinationResolver {
/**
* Resolve the given message with a user destination to one or more messages
* with actual destinations, one for each active user session.
* @param message the message to try to resolve
* @return 0 or more target messages (one for each active session), or
* {@code null} if the source message does not contain a user destination.
*/
@Nullable
UserDestinationResult resolveDestination(Message<?> message);
}
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